| author name | recommending | commenting | favorite | papers | recom. | cited | |
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| 0 | 0 | 0 | 45 | 0 | 63 | [Update] | |
| 0 | 0 | 0 | 5 | 0 | 1 | [Update] | |
| 0 | 0 | 0 | 1 | 0 | 16 | [Update] |
Latest Paper:
K Aamodt,
B Abelev,
A Abrahantes Quintana,
D Adamová,
A M Adare,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
A Agostinelli,
S Aguilar Salazar,
Z Ahammed,
N Ahmad,
A Ahmad Masoodi,
S U Ahn,
A Akindinov,
D Aleksandrov,
B Alessandro,
R Alfaro Molina,
A Alici,
A Alkin,
E Almaráz Aviña,
J Alme,
T Alt,
V Altini,
S Altinpinar,
I Altsybeev,
C Andrei,
A Andronic,
V Anguelov,
J Anielski,
T Antičić,
F Antinori,
P Antonioli,
L Aphecetche,
H Appelshäuser,
N Arbor,
S Arcelli,
A Arend,
N Armesto,
R Arnaldi,
T Aronsson,
I C Arsene,
M Arslandok,
A Asryan,
A Augustinus,
R Averbeck,
T C Awes,
J Aystö,
M D Azmi,
M Bach,
A Badalà,
Y W Baek,
R Bailhache,
R Bala,
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A Baldisseri,
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M Zynovyev
Department of Physics and Technology, University of Bergen, Bergen, Norway.
The yield of charged particles associated with high-p_{t} trigger particles (8<p_{t}<15 GeV/c) is measured with the ALICE detector in Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV relative to proton-proton collisions at the same energy. The conditional per-trigger yields are extracted from the narrow jetlike correlation peaks in azimuthal dihadron correlations. In the 5% most central collisions, we observe that the yield of associated charged particles with transverse momenta p_{t}>3 GeV/c on the away side drops to about 60% of that observed in pp collisions, while on the near side a moderate enhancement of 20%-30% is found.
B Abelev,
A Abrahantes Quintana,
D Adamová,
A M Adare,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
A Agostinelli,
S Aguilar Salazar,
Z Ahammed,
N Ahmad,
A Ahmad Masoodi,
S U Ahn,
A Akindinov,
D Aleksandrov,
B Alessandro,
R Alfaromolina,
A Alici,
A Alkin,
E Almaráz Aviña,
T Alt,
V Altini,
S Altinpinar,
I Altsybeev,
C Andrei,
A Andronic,
V Anguelov,
C Anson,
T Antičić,
F Antinori,
P Antonioli,
L Aphecetche,
H Appelshäuser,
N Arbor,
S Arcelli,
A Arend,
N Armesto,
R Arnaldi,
T Aronsson,
I C Arsene,
M Arslandok,
A Asryan,
A Augustinus,
R Averbeck,
T C Awes,
J Aystö,
M D Azmi,
M Bach,
A Badalà,
Y W Baek,
R Bailhache,
R Bala,
R Baldini Ferroli,
A Baldisseri,
A Baldit,
F Baltasar Dos Santos Pedrosa,
J Bán,
R C Baral,
R Barbera,
F Barile,
G G Barnaföldi,
L S Barnby,
V Barret,
J Bartke,
M Basile,
N Bastid,
B Bathen,
G Batigne,
B Batyunya,
C Baumann,
I G Bearden,
H Beck,
I Belikov,
F Bellini,
R Bellwied,
E Belmont-Moreno,
S Beole,
I Berceanu,
A Bercuci,
Y Berdnikov,
D Berenyi,
C Bergmann,
D Berzano,
L Betev,
A Bhasin,
A K Bhati,
N Bianchi,
L Bianchi,
C Bianchin,
J Bielčík,
J Bielčíková,
A Bilandzic,
F Blanco,
D Blau,
C Blume,
M Boccioli,
N Bock,
A Bogdanov,
H Bøggild,
M Bogolyubsky,
L Boldizsár,
M Bombara,
J Book,
H Borel,
A Borissov,
C Bortolin,
S Bose,
F Bossú,
M Botje,
S Böttger,
B Boyer,
P Braun-Munzinger,
M Bregant,
T Breitner,
M Broz,
R Brun,
E Bruna,
G E Bruno,
D Budnikov,
H Buesching,
S Bufalino,
K Bugaiev,
O Busch,
Z Buthelezi,
D Caffarri,
X Cai,
H Caines,
E Calvo Villar,
P Camerini,
V Canoa Roman,
G Cara Romeo,
W Carena,
F Carena,
N Carlin Filho,
F Carminati,
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A Casanova Díaz,
M Caselle,
J Castillo Castellanos,
J F Castillo Hernandez,
E A R Casula,
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P Cerello,
B Chang,
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J L Charvet,
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V Chibante Barroso,
D D Chinellato,
P Chochula,
M Chojnacki,
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C H Christensen,
P Christiansen,
T Chujo,
S U Chung,
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L Cifarelli,
F Cindolo,
J Cleymans,
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F Costa,
M E Cotallo,
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P Crochet,
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E Cuautle,
L Cunqueiro,
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M Song,
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B K Srivastava,
J Stachel,
I Stan,
G Stefanek,
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T Steinbeck,
M Steinpreis,
E Stenlund,
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D Stocco,
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P Strmen,
A A P Suaide,
M A Subieta Vásquez,
T Sugitate,
C Suire,
M Sukhorukov,
R Sultanov,
M Sumbera,
T Susa,
A Szanto de Toledo,
I Szarka,
A Szostak,
C Tagridis,
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J D Tapia Takaki,
A Tauro,
G Tejeda Muñoz,
A Telesca,
C Terrevoli,
J Thäder,
J H Thomas,
D Thomas,
R Tieulent,
A R Timmins,
D Tlusty,
A Toia,
H Torii,
L Toscano,
F Tosello,
T Traczyk,
D Truesdale,
W H Trzaska,
T Tsuji,
A Tumkin,
R Turrisi,
T S Tveter,
J Ulery,
K Ullaland,
J Ulrich,
A Uras,
J Urbán,
G M Urciuoli,
G L Usai,
M Vajzer,
M Vala,
L Valencia Palomo,
S Vallero,
N van der Kolk,
P Vande Vyvre,
M van Leeuwen,
L Vannucci,
A Vargas,
R Varma,
M Vasileiou,
A Vasiliev,
V Vechernin,
M Veldhoen,
M Venaruzzo,
E Vercellin,
S Vergara,
D C Vernekohl,
R Vernet,
M Verweij,
L Vickovic,
G Viesti,
O Vikhlyantsev,
Z Vilakazi,
O Villalobos Baillie,
A Vinogradov,
L Vinogradov,
Y Vinogradov,
T Virgili,
Y P Viyogi,
A Vodopyanov,
K Voloshin,
S Voloshin,
G Volpe,
B von Haller,
D Vranic,
J Vrláková,
B Vulpescu,
A Vyushin,
V Wagner,
B Wagner,
R Wan,
Y Wang,
D Wang,
M Wang,
K Watanabe,
J P Wessels,
U Westerhoff,
J Wiechula,
J Wikne,
M Wilde,
G Wilk,
A Wilk,
M C S Williams,
B Windelband,
L Xaplanteris Karampatsos,
H Yang,
S Yano,
S Yasnopolskiy,
J Yi,
Z Yin,
H Yokoyama,
I-K Yoo,
J Yoon,
W Yu,
X Yuan,
I Yushmanov,
C Zach,
C Zampolli,
S Zaporozhets,
A Zarochentsev,
P Závada,
N Zaviyalov,
H Zbroszczyk,
P Zelnicek,
I Zgura,
M Zhalov,
X Zhang,
F Zhou,
D Zhou,
Y Zhou,
X Zhu,
A Zichichi,
A Zimmermann,
G Zinovjev,
Y Zoccarato,
M Zynovyev
Lawrence Livermore National Laboratory, Livermore, California, USA.
The ALICE Collaboration has studied J/ψ production in pp collisions at sqrt[s]=7 TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/ψ polarization parameters λ_{θ} and λ_{ϕ} were obtained. The study was performed in the kinematic region 2.5<y<4, 2<p_{t}<8 GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.
A Adare,
S Afanasiev,
C Aidala,
N N Ajitanand,
Y Akiba,
H Al-Bataineh,
J Alexander,
A Angerami,
K Aoki,
N Apadula,
L Aphecetche,
Y Aramaki,
J Asai,
E T Atomssa,
R Averbeck,
T C Awes,
B Azmoun,
V Babintsev,
M Bai,
G Baksay,
L Baksay,
A Baldisseri,
K N Barish,
P D Barnes,
B Bassalleck,
A T Basye,
S Bathe,
S Batsouli,
V Baublis,
C Baumann,
A Bazilevsky,
S Belikov,
R Belmont,
R Bennett,
A Berdnikov,
Y Berdnikov,
J H Bhom,
A A Bickley,
D S Blau,
J G Boissevain,
J S Bok,
H Borel,
K Boyle,
M L Brooks,
H Buesching,
V Bumazhnov,
G Bunce,
S Butsyk,
C M Camacho,
S Campbell,
A Caringi,
B S Chang,
W C Chang,
J-L Charvet,
C-H Chen,
S Chernichenko,
C Y Chi,
M Chiu,
I J Choi,
J B Choi,
R K Choudhury,
P Christiansen,
T Chujo,
P Chung,
A Churyn,
O Chvala,
V Cianciolo,
Z Citron,
B A Cole,
Z Conesa del Valle,
M Connors,
P Constantin,
M Csanád,
T Csörgo,
T Dahms,
S Dairaku,
I Danchev,
K Das,
A Datta,
G David,
M K Dayananda,
A Denisov,
D d'Enterria,
A Deshpande,
E J Desmond,
K V Dharmawardane,
O Dietzsch,
A Dion,
M Donadelli,
O Drapier,
A Drees,
K A Drees,
A K Dubey,
J M Durham,
A Durum,
D Dutta,
V Dzhordzhadze,
L D'Orazio,
S Edwards,
Y V Efremenko,
F Ellinghaus,
T Engelmore,
A Enokizono,
H En'yo,
S Esumi,
K O Eyser,
B Fadem,
D E Fields,
M Finger,
M Finger Jr,
F Fleuret,
S L Fokin,
Z Fraenkel,
J E Frantz,
A Franz,
A D Frawley,
K Fujiwara,
Y Fukao,
T Fusayasu,
I Garishvili,
A Glenn,
H Gong,
M Gonin,
J Gosset,
Y Goto,
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N Grau,
S V Greene,
G Grim,
M Grosse Perdekamp,
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H-Å Gustafsson,
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K I Hahn,
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R Han,
J Hanks,
E P Hartouni,
K Haruna,
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R Hayano,
X He,
M Heffner,
T K Hemmick,
T Hester,
J C Hill,
M Hohlmann,
W Holzmann,
K Homma,
B Hong,
T Horaguchi,
D Hornback,
S Huang,
T Ichihara,
R Ichimiya,
H Iinuma,
Y Ikeda,
K Imai,
J Imrek,
M Inaba,
D Isenhower,
M Ishihara,
T Isobe,
M Issah,
A Isupov,
D Ivanischev,
Y Iwanaga,
B V Jacak,
J Jia,
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J Jin,
B M Johnson,
T Jones,
K S Joo,
D Jouan,
D S Jumper,
F Kajihara,
S Kametani,
N Kamihara,
J Kamin,
J H Kang,
J Kapustinsky,
K Karatsu,
M Kasai,
D Kawall,
M Kawashima,
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T Kempel,
A Khanzadeev,
K M Kijima,
J Kikuchi,
A Kim,
B I Kim,
D H Kim,
D J Kim,
E Kim,
E J Kim,
S H Kim,
Y-J Kim,
E Kinney,
K Kiriluk,
Á Kiss,
E Kistenev,
J Klay,
C Klein-Boesing,
L Kochenda,
B Komkov,
M Konno,
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A Kozlov,
A Král,
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K Kurita,
M Kurosawa,
M J Kweon,
Y Kwon,
G S Kyle,
R Lacey,
Y S Lai,
J G Lajoie,
D Layton,
A Lebedev,
D M Lee,
J Lee,
K B Lee,
K S Lee,
T Lee,
M J Leitch,
M A L Leite,
B Lenzi,
X Li,
P Lichtenwalner,
P Liebing,
L A Linden Levy,
T Liška,
A Litvinenko,
H Liu,
M X Liu,
B Love,
D Lynch,
C F Maguire,
Y I Makdisi,
A Malakhov,
M D Malik,
V I Manko,
E Mannel,
Y Mao,
L Mašek,
H Masui,
F Matathias,
M McCumber,
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D McGlinchey,
N Means,
B Meredith,
Y Miake,
T Mibe,
A C Mignerey,
P Mikeš,
K Miki,
A Milov,
M Mishra,
J T Mitchell,
A K Mohanty,
H J Moon,
Y Morino,
A Morreale,
D P Morrison,
T V Moukhanova,
D Mukhopadhyay,
T Murakami,
J Murata,
S Nagamiya,
J L Nagle,
M Naglis,
M I Nagy,
I Nakagawa,
Y Nakamiya,
K R Nakamura,
T Nakamura,
K Nakano,
S Nam,
J Newby,
M Nguyen,
M Nihashi,
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A S Nyanin,
C Oakley,
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S X Oda,
C A Ogilvie,
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I H Park,
J Park,
S K Park,
W J Park,
S F Pate,
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J-C Peng,
H Pereira,
V Peresedov,
D Yu Peressounko,
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R P Pisani,
M Proissl,
M L Purschke,
A K Purwar,
H Qu,
J Rak,
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M Rosati,
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V Semenov,
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T-A Shibata,
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A Sickles,
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C Silvestre,
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V Singh,
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W E Sondheim,
S P Sorensen,
I V Sourikova,
F Staley,
P W Stankus,
E Stenlund,
M Stepanov,
A Ster,
S P Stoll,
T Sugitate,
C Suire,
A Sukhanov,
J Sziklai,
E M Takagui,
A Taketani,
R Tanabe,
Y Tanaka,
S Taneja,
K Tanida,
M J Tannenbaum,
S Tarafdar,
A Taranenko,
P Tarján,
H Themann,
D Thomas,
T L Thomas,
M Togawa,
A Toia,
L Tomášek,
Y Tomita,
H Torii,
R S Towell,
V-N Tram,
I Tserruya,
Y Tsuchimoto,
C Vale,
H Valle,
H W van Hecke,
E Vazquez-Zambrano,
A Veicht,
J Velkovska,
R Vértesi,
A A Vinogradov,
M Virius,
A Vossen,
V Vrba,
E Vznuzdaev,
X R Wang,
D Watanabe,
K Watanabe,
Y Watanabe,
F Wei,
R Wei,
J Wessels,
S N White,
D Winter,
C L Woody,
R M Wright,
M Wysocki,
W Xie,
Y L Yamaguchi,
K Yamaura,
R Yang,
A Yanovich,
J Ying,
S Yokkaichi,
Z You,
G R Young,
I Younus,
I E Yushmanov,
W A Zajc,
O Zaudtke,
C Zhang,
S Zhou,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
We present measurements of J/ψ yields in d+Au collisions at sqrt[s(NN)]=200 GeV recorded by the PHENIX experiment and compare them with yields in p+p collisions at the same energy per nucleon-nucleon collision. The measurements cover a large kinematic range in J/ψ rapidity (-2.2<y<2.4) with high statistical precision and are compared with two theoretical models: one with nuclear shadowing combined with final state breakup and one with coherent gluon saturation effects. In order to remove model dependent systematic uncertainties we also compare the data to a simple geometric model. The forward rapidity data are inconsistent with nuclear modifications that are linear or exponential in the density weighted longitudinal thickness, such as those from the final state breakup of the bound state.
K Aamodt,
B Abelev,
A Abrahantes Quintana,
D Adamová,
A M Adare,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
A Agostinelli,
S Aguilar Salazar,
Z Ahammed,
N Ahmad,
A Ahmad Masoodi,
S U Ahn,
A Akindinov,
D Aleksandrov,
B Alessandro,
R Alfaro Molina,
A Alici,
A Alkin,
E Almaráz Aviña,
T Alt,
V Altini,
I Altsybeev,
C Andrei,
A Andronic,
V Anguelov,
C Anson,
T Antičić,
F Antinori,
P Antonioli,
L Aphecetche,
H Appelshäuser,
N Arbor,
S Arcelli,
A Arend,
N Armesto,
R Arnaldi,
T Aronsson,
I C Arsene,
M Arslandok,
A Asryan,
A Augustinus,
R Averbeck,
T C Awes,
J Äystö,
M D Azmi,
M Bach,
A Badalà,
Y W Baek,
R Bailhache,
R Bala,
R Baldini Ferroli,
A Baldisseri,
A Baldit,
J Bán,
R C Baral,
R Barbera,
F Barile,
G G Barnaföldi,
L S Barnby,
V Barret,
J Bartke,
M Basile,
N Bastid,
B Bathen,
G Batigne,
B Batyunya,
C Baumann,
I G Bearden,
H Beck,
I Belikov,
F Bellini,
R Bellwied,
E Belmont-Moreno,
S Beole,
I Berceanu,
A Bercuci,
E Berdermann,
Y Berdnikov,
C Bergmann,
L Betev,
A Bhasin,
A K Bhati,
L Bianchi,
N Bianchi,
C Bianchin,
J Bielčík,
J Bielčíková,
A Bilandzic,
E Biolcati,
F Blanco,
D Blau,
C Blume,
M Boccioli,
N Bock,
A Bogdanov,
H Bøggild,
M Bogolyubsky,
L Boldizsár,
M Bombara,
C Bombonati,
J Book,
H Borel,
A Borissov,
C Bortolin,
S Bose,
F Bossú,
M Botje,
S Böttger,
B Boyer,
P Braun-Munzinger,
L Bravina,
M Bregant,
T Breitner,
M Broz,
R Brun,
E Bruna,
G E Bruno,
D Budnikov,
H Buesching,
S Bufalino,
K Bugaiev,
O Busch,
Z Buthelezi,
D Caffarri,
X Cai,
H Caines,
E Calvo Villar,
P Camerini,
V Canoa Roman,
G Cara Romeo,
F Carena,
W Carena,
N Carlin Filho,
F Carminati,
A Casanova Díaz,
M Caselle,
J Castillo Castellanos,
J F Castillo Hernandez,
V Catanescu,
C Cavicchioli,
J Cepila,
P Cerello,
B Chang,
S Chapeland,
J L Charvet,
S Chattopadhyay,
M Cherney,
C Cheshkov,
B Cheynis,
V Chibante Barroso,
D D Chinellato,
P Chochula,
M Chojnacki,
P Christakoglou,
C H Christensen,
P Christiansen,
T Chujo,
C Cicalo,
L Cifarelli,
F Cindolo,
J Cleymans,
F Coccetti,
J-P Coffin,
G Conesa Balbastre,
Z Conesa del Valle,
P Constantin,
G Contin,
J G Contreras,
T M Cormier,
Y Corrales Morales,
P Cortese,
I Cortés Maldonado,
M R Cosentino,
F Costa,
M E Cotallo,
E Crescio,
P Crochet,
E Cuautle,
L Cunqueiro,
A Dainese,
H H Dalsgaard,
A Danu,
I Das,
D Das,
S Dash,
A Dash,
S De,
A De Azevedo Moregula,
G O V de Barros,
A De Caro,
G de Cataldo,
J de Cuveland,
A De Falco,
D De Gruttola,
H Delagrange,
E Del Castillo Sanchez,
Y Delgado Mercado,
G Dellacasa,
A Deloff,
V Demanov,
N De Marco,
E Dénes,
S De Pasquale,
A Deppman,
G D Erasmo,
R de Rooij,
D Di Bari,
T Dietel,
C Di Giglio,
S Di Liberto,
A Di Mauro,
P Di Nezza,
R Divià,
Ø Djuvsland,
A Dobrin,
T Dobrowolski,
I Domínguez,
B Dönigus,
O Dordic,
O Driga,
A K Dubey,
L Ducroux,
P Dupieux,
M R Dutta Majumdar,
A K Dutta Majumdar,
D Elia,
D Emschermann,
H Engel,
H A Erdal,
B Espagnon,
M Estienne,
S Esumi,
D Evans,
S Evrard,
G Eyyubova,
C W Fabjan,
D Fabris,
J Faivre,
D Falchieri,
A Fantoni,
M Fasel,
R Fearick,
A Fedunov,
D Fehlker,
V Fekete,
D Felea,
G Feofilov,
A Fernández Téllez,
R Ferretti,
A Ferretti,
M A S Figueredo,
S Filchagin,
R Fini,
D Finogeev,
F M Fionda,
E M Fiore,
M Floris,
S Foertsch,
P Foka,
S Fokin,
E Fragiacomo,
M Fragkiadakis,
U Frankenfeld,
U Fuchs,
F Furano,
C Furget,
M Fusco Girard,
J J Gaardhøje,
S Gadrat,
M Gagliardi,
A Gago,
M Gallio,
D R Gangadharan,
P Ganoti,
C Garabatos,
E Garcia-Solis,
R Gemme,
J Gerhard,
M Germain,
C Geuna,
M Gheata,
A Gheata,
B Ghidini,
P Ghosh,
P Gianotti,
M R Girard,
P Giubellino,
E Gladysz-Dziadus,
P Glässel,
R Gomez,
E G Ferreiro,
L H González-Trueba,
P González-Zamora,
S Gorbunov,
S Gotovac,
V Grabski,
L K Graczykowski,
R Grajcarek,
A Grelli,
C Grigoras,
A Grigoras,
V Grigoriev,
S Grigoryan,
A Grigoryan,
B Grinyov,
N Grion,
P Gros,
J F Grosse-Oetringhaus,
J-Y Grossiord,
F Guber,
R Guernane,
C Guerra Gutierrez,
B Guerzoni,
M Guilbaud,
K Gulbrandsen,
H Gulkanyan,
T Gunji,
R Gupta,
A Gupta,
H Gutbrod,
Ø Haaland,
C Hadjidakis,
M Haiduc,
H Hamagaki,
G Hamar,
B H Han,
L D Hanratty,
Z Harmanova,
J W Harris,
M Hartig,
D Hasegan,
D Hatzifotiadou,
A Hayrapetyan,
M Heide,
M Heinz,
H Helstrup,
A Herghelegiu,
G Herrera Corral,
N Herrmann,
K F Hetland,
B Hicks,
P T Hille,
B Hippolyte,
T Horaguchi,
Y Hori,
P Hristov,
I Hřivnáčová,
M Huang,
S Huber,
T J Humanic,
D S Hwang,
R Ilkaev,
I Ilkiv,
M Inaba,
E Incani,
G M Innocenti,
M Ippolitov,
M Irfan,
C Ivan,
V Ivanov,
A Ivanov,
M Ivanov,
A Jachołkowski,
P M Jacobs,
L Jancurová,
S Jangal,
M A Janik,
R Janik,
P H S Y Jayarathna,
S Jena,
L Jirden,
G T Jones,
P G Jones,
P Jovanović,
W Jung,
H Jung,
A Jusko,
A B Kaidalov,
S Kalcher,
P Kaliňák,
M Kalisky,
T Kalliokoski,
A Kalweit,
R Kamermans,
K Kanaki,
J H Kang,
E Kang,
V Kaplin,
A Karasu Uysal,
O Karavichev,
T Karavicheva,
E Karpechev,
A Kazantsev,
U Kebschull,
R Keidel,
M M Khan,
P Khan,
A Khanzadeev,
Y Kharlov,
B Kileng,
S Kim,
B Kim,
D J Kim,
S H Kim,
D S Kim,
D W Kim,
J H Kim,
J S Kim,
M Kim,
S Kirsch,
I Kisel,
S Kiselev,
A Kisiel,
J L Klay,
J Klein,
C Klein-Bösing,
M Kliemant,
A Kluge,
M L Knichel,
K Koch,
M K Köhler,
A Kolojvari,
V Kondratiev,
N Kondratyeva,
A Konevskih,
E Kornaś,
C Kottachchi Kankanamge Don,
R Kour,
M Kowalski,
S Kox,
G Koyithatta Meethaleveedu,
K Kozlov,
J Kral,
I Králik,
F Kramer,
I Kraus,
T Krawutschke,
M Kretz,
M Krivda,
F Krizek,
M Krus,
E Kryshen,
M Krzewicki,
Y Kucheriaev,
C Kuhn,
P G Kuijer,
P Kurashvili,
A Kurepin,
A B Kurepin,
A Kuryakin,
S Kushpil,
V Kushpil,
H Kvaerno,
M J Kweon,
Y Kwon,
P Ladrón de Guevara,
V Lafage,
I Lakomov,
C Lara,
A Lardeux,
P La Rocca,
D T Larsen,
C Lazzeroni,
R Lea,
Y Le Bornec,
K S Lee,
S C Lee,
F Lefèvre,
J Lehnert,
L Leistam,
M Lenhardt,
V Lenti,
H León,
I León Monzón,
H León Vargas,
P Lévai,
X Li,
J Lien,
R Lietava,
S Lindal,
V Lindenstruth,
C Lippmann,
M A Lisa,
L Liu,
P I Loenne,
V R Loggins,
V Loginov,
S Lohn,
D Lohner,
C Loizides,
K K Loo,
X Lopez,
M López Noriega,
E López Torres,
G Løvhøiden,
X-G Lu,
P Luettig,
M Lunardon,
G Luparello,
L Luquin,
C Luzzi,
K Ma,
R Ma,
D M Madagodahettige-Don,
A Maevskaya,
M Mager,
D P Mahapatra,
A Maire,
M Malaev,
I Maldonado Cervantes,
D Mal'Kevich,
P Malzacher,
A Mamonov,
L Mangotra,
V Manko,
F Manso,
V Manzari,
Y Mao,
M Marchisone,
J Mareš,
G V Margagliotti,
A Margotti,
A Marín,
C Markert,
I Martashvili,
P Martinengo,
M I Martínez,
A Martínez Davalos,
G Martínez García,
Y Martynov,
A Mas,
S Masciocchi,
M Masera,
A Masoni,
L Massacrier,
M Mastromarco,
A Mastroserio,
Z L Matthews,
A Matyja,
D Mayani,
M A Mazzoni,
F Meddi,
A Menchaca-Rocha,
P Mendez Lorenzo,
J Mercado Pérez,
M Meres,
Y Miake,
J Midori,
L Milano,
J Milosevic,
A Mischke,
D Miśkowiec,
C Mitu,
J Mlynarz,
B Mohanty,
A K Mohanty,
L Molnar,
L Montaño Zetina,
M Monteno,
E Montes,
M Morando,
D A Moreira De Godoy,
S Moretto,
A Morsch,
V Muccifora,
E Mudnic,
S Muhuri,
H Müller,
M G Munhoz,
L Musa,
A Musso,
J L Nagle,
B K Nandi,
R Nania,
E Nappi,
C Nattrass,
F Navach,
S Navin,
T K Nayak,
S Nazarenko,
G Nazarov,
A Nedosekin,
M Nicassio,
B S Nielsen,
T Niida,
S Nikolaev,
V Nikolic,
S Nikulin,
V Nikulin,
B S Nilsen,
M S Nilsson,
F Noferini,
G Nooren,
N Novitzky,
A Nyanin,
A Nyatha,
C Nygaard,
J Nystrand,
H Obayashi,
A Ochirov,
H Oeschler,
S K Oh,
J Oleniacz,
C Oppedisano,
A Ortiz Velasquez,
G Ortona,
A Oskarsson,
P Ostrowski,
J Otwinowski,
K Oyama,
K Ozawa,
Y Pachmayer,
M Pachr,
F Padilla,
P Pagano,
G Paić,
F Painke,
C Pajares,
S K Pal,
S Pal,
A Palaha,
A Palmeri,
G S Pappalardo,
W J Park,
B Pastirčák,
D I Patalakha,
V Paticchio,
A Pavlinov,
T Pawlak,
T Peitzmann,
D Peresunko,
C E Pérez Lara,
D Perini,
W Peryt,
A Pesci,
V Peskov,
Y Pestov,
A J Peters,
V Petráček,
M Petran,
M Petris,
P Petrov,
M Petrovici,
C Petta,
S Piano,
A Piccotti,
M Pikna,
P Pillot,
O Pinazza,
L Pinsky,
N Pitz,
D B Piyarathna,
R Platt,
M Płoskoń,
J Pluta,
T Pocheptsov,
S Pochybova,
P L M Podesta-Lerma,
M G Poghosyan,
K Polák,
B Polichtchouk,
A Pop,
V Pospíšil,
B Potukuchi,
S K Prasad,
R Preghenella,
F Prino,
C A Pruneau,
I Pshenichnov,
G Puddu,
A Pulvirenti,
V Punin,
M Putiš,
J Putschke,
H Qvigstad,
A Rachevski,
A Rademakers,
S Radomski,
T S Räihä,
J Rak,
A Rakotozafindrabe,
L Ramello,
A Ramírez Reyes,
M Rammler,
R Raniwala,
S Raniwala,
S S Räsänen,
D Rathee,
K F Read,
J S Real,
K Redlich,
P Reichelt,
M Reicher,
R Renfordt,
A R Reolon,
A Reshetin,
F Rettig,
J-P Revol,
K Reygers,
H Ricaud,
L Riccati,
R A Ricci,
M Richter,
P Riedler,
W Riegler,
F Riggi,
M Rodríguez Cahuantzi,
D Rohr,
D Röhrich,
R Romita,
F Ronchetti,
P Rosinský,
P Rosnet,
S Rossegger,
A Rossi,
F Roukoutakis,
S Rousseau,
P Roy,
C Roy,
A J Rubio Montero,
R Rui,
E Ryabinkin,
A Rybicki,
S Sadovsky,
K Šafařík,
R Sahoo,
P K Sahu,
P Saiz,
H Sakaguchi,
S Sakai,
D Sakata,
C A Salgado,
S Sambyal,
V Samsonov,
X Sanchez Castro,
L Šándor,
A Sandoval,
S Sano,
M Sano,
R Santo,
R Santoro,
J Sarkamo,
P Saturnini,
E Scapparone,
F Scarlassara,
R P Scharenberg,
C Schiaua,
R Schicker,
C Schmidt,
H R Schmidt,
S Schreiner,
S Schuchmann,
J Schukraft,
Y Schutz,
K Schwarz,
K Schweda,
G Scioli,
E Scomparin,
R Scott,
P A Scott,
G Segato,
I Selyuzhenkov,
S Senyukov,
S Serci,
E Serradilla,
A Sevcenco,
I Sgura,
G Shabratova,
R Shahoyan,
S Sharma,
N Sharma,
K Shigaki,
M Shimomura,
K Shtejer,
Y Sibiriak,
M Siciliano,
E Sicking,
T Siemiarczuk,
D Silvermyr,
G Simonetti,
R Singaraju,
R Singh,
S Singha,
T Sinha,
B C Sinha,
B Sitar,
M Sitta,
T B Skaali,
K Skjerdal,
R Smakal,
N Smirnov,
R Snellings,
C Søgaard,
R Soltz,
H Son,
M Song,
J Song,
C Soos,
F Soramel,
M Spyropoulou-Stassinaki,
B K Srivastava,
J Stachel,
I Stan,
G Stefanek,
T Steinbeck,
M Steinpreis,
E Stenlund,
G Steyn,
D Stocco,
C H Stokkevag,
M Stolpovskiy,
P Strmen,
A A P Suaide,
M A Subieta Vásquez,
T Sugitate,
C Suire,
M Sukhorukov,
M Sumbera,
T Susa,
T J M Symons,
A Szanto de Toledo,
I Szarka,
A Szostak,
C Tagridis,
J Takahashi,
J D Tapia Takaki,
A Tauro,
G Tejeda Muñoz,
A Telesca,
C Terrevoli,
J Thäder,
D Thomas,
J H Thomas,
R Tieulent,
A R Timmins,
D Tlusty,
A Toia,
H Torii,
L Toscano,
T Traczyk,
D Truesdale,
W H Trzaska,
T Tsuji,
A Tumkin,
R Turrisi,
A J Turvey,
T S Tveter,
J Ulery,
K Ullaland,
A Uras,
J Urbán,
G M Urciuoli,
G L Usai,
M Vajzer,
M Vala,
L Valencia Palomo,
S Vallero,
N van der Kolk,
P Vande Vyvre,
M van Leeuwen,
L Vannucci,
A Vargas,
R Varma,
M Vasileiou,
A Vasiliev,
V Vechernin,
M Veldhoen,
M Venaruzzo,
E Vercellin,
S Vergara,
D C Vernekohl,
R Vernet,
M Verweij,
L Vickovic,
G Viesti,
O Vikhlyantsev,
Z Vilakazi,
O Villalobos Baillie,
Y Vinogradov,
A Vinogradov,
L Vinogradov,
T Virgili,
Y P Viyogi,
A Vodopyanov,
K Voloshin,
S Voloshin,
G Volpe,
B von Haller,
D Vranic,
G Øvrebekk,
J Vrláková,
B Vulpescu,
A Vyushin,
B Wagner,
V Wagner,
R Wan,
Y Wang,
M Wang,
D Wang,
K Watanabe,
J P Wessels,
U Westerhoff,
J Wiechula,
J Wikne,
M Wilde,
A Wilk,
G Wilk,
M C S Williams,
B Windelband,
L Xaplanteris Karampatsos,
H Yang,
S Yasnopolskiy,
J Yi,
Z Yin,
H Yokoyama,
I-K Yoo,
J Yoon,
X Yuan,
I Yushmanov,
E Zabrodin,
C Zach,
C Zampolli,
S Zaporozhets,
A Zarochentsev,
P Závada,
N Zaviyalov,
H Zbroszczyk,
P Zelnicek,
A Zenin,
I Zgura,
M Zhalov,
X Zhang,
D Zhou,
F Zhou,
Y Zhou,
X Zhu,
A Zichichi,
G Zinovjev,
Y Zoccarato,
M Zynovyev
Department of Physics and Technology, University of Bergen, Bergen, Norway.
We report on the first measurement of the triangular v3, quadrangular v4, and pentagonal v5 charged particle flow in Pb-Pb collisions at sqrt(s(NN))= 2.76 TeV measured with the ALICE detector at the CERN Large Hadron Collider. We show that the triangular flow can be described in terms of the initial spatial anisotropy and its fluctuations, which provides strong constraints on its origin. In the most central events, where the elliptic flow v2 and v3 have similar magnitude, a double peaked structure in the two-particle azimuthal correlations is observed, which is often interpreted as a Mach cone response to fast partons. We show that this structure can be naturally explained from the measured anisotropic flow Fourier coefficients.
K Aamodt,
A Abrahantes Quintana,
D Adamová,
A M Adare,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
S Aguilar Salazar,
Z Ahammed,
N Ahmad,
A Ahmad Masoodi,
S U Ahn,
A Akindinov,
D Aleksandrov,
B Alessandro,
R Alfaro Molina,
A Alici,
A Alkin,
E Almaráz Aviña,
T Alt,
V Altini,
S Altinpinar,
I Altsybeev,
C Andrei,
A Andronic,
V Anguelov,
C Anson,
T Antičić,
F Antinori,
P Antonioli,
L Aphecetche,
H Appelshäuser,
N Arbor,
S Arcelli,
A Arend,
N Armesto,
R Arnaldi,
T Aronsson,
I C Arsene,
A Asryan,
A Augustinus,
R Averbeck,
T C Awes,
J Aystö,
M D Azmi,
M Bach,
A Badalà,
Y W Baek,
S Bagnasco,
R Bailhache,
R Bala,
R Baldini Ferroli,
A Baldisseri,
A Baldit,
J Bán,
R Barbera,
F Barile,
G G Barnaföldi,
L S Barnby,
V Barret,
J Bartke,
M Basile,
N Bastid,
B Bathen,
G Batigne,
B Batyunya,
C Baumann,
I G Bearden,
H Beck,
I Belikov,
F Bellini,
R Bellwied,
E Belmont-Moreno,
S Beole,
I Berceanu,
A Bercuci,
E Berdermann,
Y Berdnikov,
L Betev,
A Bhasin,
A K Bhati,
L Bianchi,
N Bianchi,
C Bianchin,
J Bielčík,
J Bielčíková,
A Bilandzic,
E Biolcati,
A Blanc,
F Blanco,
D Blau,
C Blume,
M Boccioli,
N Bock,
A Bogdanov,
H Bøggild,
M Bogolyubsky,
L Boldizsár,
M Bombara,
C Bombonati,
J Book,
H Borel,
C Bortolin,
S Bose,
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I-K Yoo,
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C Zampolli,
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A Zarochentsev,
P Závada,
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G Zinovjev,
Y Zoccarato,
M Zynovyev
Department of Physics and Technology, University of Bergen, Bergen, Norway.
The centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV is presented. The charged-particle density normalized per participating nucleon pair increases by about a factor of 2 from peripheral (70%-80%) to central (0%-5%) collisions. The centrality dependence is found to be similar to that observed at lower collision energies. The data are compared with models based on different mechanisms for particle production in nuclear collisions.
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C Silvestre,
K S Sim,
C P Singh,
V Singh,
S Skutnik,
M Slunecka,
W C Smith,
A Soldatov,
R A Soltz,
W E Sondheim,
S P Sorensen,
I V Sourikova,
F Staley,
P W Stankus,
E Stenlund,
M Stepanov,
A Ster,
S P Stoll,
T Sugitate,
C Suire,
J P Sullivan,
J Sziklai,
T Tabaru,
S Takagi,
E M Takagui,
A Taketani,
K H Tanaka,
Y Tanaka,
K Tanida,
M J Tannenbaum,
A Taranenko,
P Tarján,
T L Thomas,
M Togawa,
A Toia,
J Tojo,
L Tomásek,
H Torii,
R S Towell,
V-N Tram,
I Tserruya,
Y Tsuchimoto,
S K Tuli,
H Tydesjö,
N Tyurin,
C Vale,
H Valle,
H W van Hecke,
J Velkovska,
R Vertesi,
A A Vinogradov,
M Virius,
V Vrba,
E Vznuzdaev,
M Wagner,
D Walker,
X R Wang,
Y Watanabe,
J Wessels,
S N White,
N Willis,
D Winter,
C L Woody,
M Wysocki,
W Xie,
Y L Yamaguchi,
A Yanovich,
Z Yasin,
J Ying,
S Yokkaichi,
G R Young,
I Younus,
I E Yushmanov,
W A Zajc,
O Zaudtke,
C Zhang,
S Zhou,
J Zimányi,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
The production of e;{+}e;{-} pairs for m_{e;{+}e;{-}}<0.3 GeV/c;{2} and 1<p_{T}<5 GeV/c is measured in p+p and Au+Au collisions at sqrt[s_{NN}]=200 GeV. An enhanced yield above hadronic sources is observed. Treating the excess as photon internal conversions, the invariant yield of direct photons is deduced. In central Au+Au collisions, the excess of the direct photon yield over p+p is exponential in transverse momentum, with an inverse slope T=221+/-19;{stat}+/-19;{syst} MeV. Hydrodynamical models with initial temperatures ranging from T_{init} approximately 300-600 MeV at times of approximately 0.6-0.15 fm/c after the collision are in qualitative agreement with the data. Lattice QCD predicts a phase transition to quark gluon plasma at approximately 170 MeV.
A Adare,
S Afanasiev,
C Aidala,
N N Ajitanand,
Y Akiba,
H Al-Bataineh,
J Alexander,
K Aoki,
L Aphecetche,
R Armendariz,
S H Aronson,
J Asai,
E T Atomssa,
R Averbeck,
T C Awes,
B Azmoun,
V Babintsev,
M Bai,
G Baksay,
L Baksay,
A Baldisseri,
K N Barish,
P D Barnes,
B Bassalleck,
A T Basye,
S Bathe,
S Batsouli,
V Baublis,
C Baumann,
A Bazilevsky,
S Belikov,
R Bennett,
A Berdnikov,
Y Berdnikov,
A A Bickley,
J G Boissevain,
H Borel,
K Boyle,
M L Brooks,
H Buesching,
V Bumazhnov,
G Bunce,
S Butsyk,
C M Camacho,
S Campbell,
B S Chang,
W C Chang,
J-L Charvet,
S Chernichenko,
J Chiba,
C Y Chi,
M Chiu,
I J Choi,
R K Choudhury,
T Chujo,
P Chung,
A Churyn,
V Cianciolo,
Z Citron,
C R Cleven,
B A Cole,
M P Comets,
P Constantin,
M Csanád,
T Csörgo,
T Dahms,
S Dairaku,
K Das,
G David,
M B Deaton,
K Dehmelt,
H Delagrange,
A Denisov,
D d'Enterria,
A Deshpande,
E J Desmond,
O Dietzsch,
A Dion,
M Donadelli,
O Drapier,
A Drees,
K A Drees,
A K Dubey,
A Durum,
D Dutta,
V Dzhordzhadze,
Y V Efremenko,
J Egdemir,
F Ellinghaus,
W S Emam,
T Engelmore,
A Enokizono,
H En'yo,
S Esumi,
K O Eyser,
B Fadem,
D E Fields,
M Finger Jr,
M Finger,
F Fleuret,
S L Fokin,
Z Fraenkel,
J E Frantz,
A Franz,
A D Frawley,
K Fujiwara,
Y Fukao,
T Fusayasu,
S Gadrat,
I Garishvili,
A Glenn,
H Gong,
M Gonin,
J Gosset,
Y Goto,
R Granier de Cassagnac,
N Grau,
S V Greene,
M Grosse Perdekamp,
T Gunji,
H-A Gustafsson,
T Hachiya,
A Hadj Henni,
C Haegemann,
J S Haggerty,
H Hamagaki,
R Han,
H Harada,
E P Hartouni,
K Haruna,
E Haslum,
R Hayano,
M Heffner,
T K Hemmick,
T Hester,
X He,
H Hiejima,
J C Hill,
R Hobbs,
M Hohlmann,
W Holzmann,
K Homma,
B Hong,
T Horaguchi,
D Hornback,
S Huang,
T Ichihara,
R Ichimiya,
Y Ikeda,
K Imai,
J Imrek,
M Inaba,
Y Inoue,
D Isenhower,
L Isenhower,
M Ishihara,
T Isobe,
M Issah,
A Isupov,
D Ivanischev,
B V Jacak,
J Jia,
J Jin,
O Jinnouchi,
B M Johnson,
K S Joo,
D Jouan,
F Kajihara,
S Kametani,
N Kamihara,
J Kamin,
M Kaneta,
J H Kang,
H Kanou,
J Kapustinsky,
D Kawall,
A V Kazantsev,
T Kempel,
A Khanzadeev,
K M Kijima,
J Kikuchi,
B I Kim,
D H Kim,
D J Kim,
E Kim,
S H Kim,
E Kinney,
K Kiriluk,
A Kiss,
E Kistenev,
A Kiyomichi,
J Klay,
C Klein-Boesing,
L Kochenda,
V Kochetkov,
B Komkov,
M Konno,
J Koster,
D Kotchetkov,
A Kozlov,
A Král,
A Kravitz,
J Kubart,
G J Kunde,
N Kurihara,
K Kurita,
M Kurosawa,
M J Kweon,
Y Kwon,
G S Kyle,
R Lacey,
Y-S Lai,
Y S Lai,
J G Lajoie,
D Layton,
A Lebedev,
D M Lee,
K B Lee,
M K Lee,
T Lee,
M J Leitch,
M A L Leite,
B Lenzi,
P Liebing,
T Liska,
A Litvinenko,
H Liu,
M X Liu,
X Li,
B Love,
D Lynch,
C F Maguire,
Y I Makdisi,
A Malakhov,
M D Malik,
V I Manko,
E Mannel,
Y Mao,
L Masek,
H Masui,
F Matathias,
M McCumber,
P L McGaughey,
N Means,
B Meredith,
Y Miake,
P Mikes,
K Miki,
T E Miller,
A Milov,
S Mioduszewski,
M Mishra,
J T Mitchell,
M Mitrovski,
A K Mohanty,
Y Morino,
A Morreale,
D P Morrison,
T V Moukhanova,
D Mukhopadhyay,
J Murata,
S Nagamiya,
Y Nagata,
J L Nagle,
M Naglis,
M I Nagy,
I Nakagawa,
Y Nakamiya,
T Nakamura,
K Nakano,
J Newby,
M Nguyen,
T Niita,
B E Norman,
R Nouicer,
A S Nyanin,
E O'Brien,
S X Oda,
C A Ogilvie,
H Ohnishi,
H Okada,
K Okada,
M Oka,
O O Omiwade,
Y Onuki,
A Oskarsson,
M Ouchida,
K Ozawa,
R Pak,
D Pal,
A P T Palounek,
V Pantuev,
V Papavassiliou,
J Park,
W J Park,
S F Pate,
H Pei,
J-C Peng,
H Pereira,
V Peresedov,
D Yu Peressounko,
C Pinkenburg,
M L Purschke,
A K Purwar,
H Qu,
J Rak,
A Rakotozafindrabe,
I Ravinovich,
K F Read,
S Rembeczki,
M Reuter,
K Reygers,
V Riabov,
Y Riabov,
D Roach,
G Roche,
S D Rolnick,
A Romana,
M Rosati,
S S E Rosendahl,
P Rosnet,
P Rukoyatkin,
P Ruzicka,
V L Rykov,
B Sahlmueller,
N Saito,
T Sakaguchi,
S Sakai,
K Sakashita,
H Sakata,
V Samsonov,
S Sato,
T Sato,
S Sawada,
K Sedgwick,
J Seele,
R Seidl,
A Yu Semenov,
V Semenov,
R Seto,
D Sharma,
I Shein,
A Shevel,
T-A Shibata,
K Shigaki,
M Shimomura,
K Shoji,
P Shukla,
A Sickles,
C L Silva,
D Silvermyr,
C Silvestre,
K S Sim,
B K Singh,
C P Singh,
V Singh,
S Skutnik,
M Slunecka,
A Soldatov,
R A Soltz,
W E Sondheim,
S P Sorensen,
I V Sourikova,
F Staley,
P W Stankus,
E Stenlund,
M Stepanov,
A Ster,
S P Stoll,
T Sugitate,
C Suire,
A Sukhanov,
J Sziklai,
T Tabaru,
S Takagi,
E M Takagui,
A Taketani,
R Tanabe,
Y Tanaka,
K Tanida,
M J Tannenbaum,
A Taranenko,
P Tarján,
H Themann,
T L Thomas,
M Togawa,
A Toia,
J Tojo,
L Tomásek,
Y Tomita,
H Torii,
R S Towell,
V-N Tram,
I Tserruya,
Y Tsuchimoto,
C Vale,
H Valle,
H W van Hecke,
A Veicht,
J Velkovska,
R Vertesi,
A A Vinogradov,
M Virius,
V Vrba,
E Vznuzdaev,
M Wagner,
D Walker,
X R Wang,
Y Watanabe,
F Wei,
J Wessels,
S N White,
D Winter,
C L Woody,
M Wysocki,
W Xie,
Y L Yamaguchi,
K Yamaura,
R Yang,
A Yanovich,
Z Yasin,
J Ying,
S Yokkaichi,
G R Young,
I Younus,
I E Yushmanov,
W A Zajc,
O Zaudtke,
C Zhang,
S Zhou,
J Zimányi,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y|<0.35 in p+p collisions at square root of s=200 GeV is measured by the PHENIX experiment at the Relativistic Heavy Ion Collider over the transverse momentum range 2<pT<7 GeV/c. The ratio of the yield of electrons from bottom to that from charm is presented. The ratio is determined using partial D/D-->e(+/-)K(-/+)X (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4 GeV/c in pT. A fixed-order-plus-next-to-leading-log perturbative quantum chromodynamics calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is sigma(bb)=3.2(-1.1)(+1.2)(stat)(-1.3)(+1.4)(syst)mub.
A Adare,
S Afanasiev,
C Aidala,
N N Ajitanand,
Y Akiba,
H Al-Bataineh,
J Alexander,
K Aoki,
L Aphecetche,
J Asai,
E T Atomssa,
R Averbeck,
T C Awes,
B Azmoun,
V Babintsev,
M Bai,
G Baksay,
L Baksay,
A Baldisseri,
K N Barish,
P D Barnes,
B Bassalleck,
A T Basye,
S Bathe,
S Batsouli,
V Baublis,
C Baumann,
A Bazilevsky,
S Belikov,
R Bennett,
A Berdnikov,
Y Berdnikov,
A A Bickley,
J G Boissevain,
H Borel,
K Boyle,
M L Brooks,
H Buesching,
V Bumazhnov,
G Bunce,
S Butsyk,
C M Camacho,
S Campbell,
P Chand,
B S Chang,
W C Chang,
J-L Charvet,
S Chernichenko,
C Y Chi,
M Chiu,
I J Choi,
R K Choudhury,
T Chujo,
P Chung,
A Churyn,
V Cianciolo,
Z Citron,
B A Cole,
P Constantin,
M Csanád,
T Csörgo,
T Dahms,
S Dairaku,
K Das,
G David,
A Denisov,
D d'Enterria,
A Deshpande,
E J Desmond,
O Dietzsch,
A Dion,
M Donadelli,
O Drapier,
A Drees,
K A Drees,
A K Dubey,
A Durum,
D Dutta,
V Dzhordzhadze,
Y V Efremenko,
J Egdemir,
F Ellinghaus,
T Engelmore,
A Enokizono,
H En'yo,
S Esumi,
K O Eyser,
B Fadem,
D E Fields,
M Finger,
M Finger Jr,
F Fleuret,
S L Fokin,
Z Fraenkel,
J E Frantz,
A Franz,
A D Frawley,
K Fujiwara,
Y Fukao,
T Fusayasu,
I Garishvili,
A Glenn,
H Gong,
M Gonin,
J Gosset,
Y Goto,
R Granier de Cassagnac,
N Grau,
S V Greene,
M Grosse Perdekamp,
T Gunji,
H-A Gustafsson,
A Hadj Henni,
J S Haggerty,
H Hamagaki,
R Han,
E P Hartouni,
K Haruna,
E Haslum,
R Hayano,
M Heffner,
T K Hemmick,
T Hester,
X He,
J C Hill,
M Hohlmann,
W Holzmann,
K Homma,
B Hong,
T Horaguchi,
D Hornback,
S Huang,
T Ichihara,
R Ichimiya,
Y Ikeda,
K Imai,
J Imrek,
M Inaba,
D Isenhower,
M Ishihara,
T Isobe,
M Issah,
A Isupov,
D Ivanischev,
B V Jacak,
J Jia,
J Jin,
B M Johnson,
K S Joo,
D Jouan,
F Kajihara,
S Kametani,
N Kamihara,
J Kamin,
J H Kang,
J Kapustinsky,
D Kawall,
A V Kazantsev,
T Kempel,
A Khanzadeev,
K M Kijima,
J Kikuchi,
B I Kim,
D H Kim,
D J Kim,
E Kim,
S H Kim,
E Kinney,
K Kiriluk,
A Kiss,
E Kistenev,
J Klay,
C Klein-Boesing,
L Kochenda,
V Kochetkov,
B Komkov,
M Konno,
J Koster,
A Kozlov,
A Král,
A Kravitz,
G J Kunde,
K Kurita,
M Kurosawa,
M J Kweon,
Y Kwon,
G S Kyle,
R Lacey,
Y S Lai,
J G Lajoie,
D Layton,
A Lebedev,
D M Lee,
K B Lee,
T Lee,
M J Leitch,
M A L Leite,
B Lenzi,
P Liebing,
T Liska,
A Litvinenko,
H Liu,
M X Liu,
X Li,
B Love,
D Lynch,
C F Maguire,
Y I Makdisi,
A Malakhov,
M D Malik,
V I Manko,
E Mannel,
Y Mao,
L Masek,
H Masui,
F Matathias,
M McCumber,
P L McGaughey,
N Means,
B Meredith,
Y Miake,
P Mikes,
K Miki,
A Milov,
M Mishra,
J T Mitchell,
A K Mohanty,
Y Morino,
A Morreale,
D P Morrison,
T V Moukhanova,
D Mukhopadhyay,
J Murata,
S Nagamiya,
J L Nagle,
M Naglis,
M I Nagy,
I Nakagawa,
Y Nakamiya,
T Nakamura,
K Nakano,
J Newby,
M Nguyen,
T Niita,
R Nouicer,
A S Nyanin,
E O'Brien,
S X Oda,
C A Ogilvie,
H Okada,
K Okada,
M Oka,
Y Onuki,
A Oskarsson,
M Ouchida,
K Ozawa,
R Pak,
A P T Palounek,
V Pantuev,
V Papavassiliou,
J Park,
W J Park,
S F Pate,
H Pei,
J-C Peng,
H Pereira,
V Peresedov,
D Yu Peressounko,
C Pinkenburg,
M L Purschke,
A K Purwar,
H Qu,
J Rak,
A Rakotozafindrabe,
I Ravinovich,
K F Read,
S Rembeczki,
M Reuter,
K Reygers,
V Riabov,
Y Riabov,
D Roach,
G Roche,
S D Rolnick,
M Rosati,
S S E Rosendahl,
P Rosnet,
P Rukoyatkin,
P Ruzicka,
V L Rykov,
B Sahlmueller,
N Saito,
T Sakaguchi,
S Sakai,
K Sakashita,
V Samsonov,
T Sato,
S Sawada,
K Sedgwick,
J Seele,
R Seidl,
A Yu Semenov,
V Semenov,
R Seto,
D Sharma,
I Shein,
T-A Shibata,
K Shigaki,
M Shimomura,
K Shoji,
P Shukla,
A Sickles,
C L Silva,
D Silvermyr,
C Silvestre,
K S Sim,
B K Singh,
C P Singh,
V Singh,
M Slunecka,
A Soldatov,
R A Soltz,
W E Sondheim,
S P Sorensen,
I V Sourikova,
F Staley,
P W Stankus,
E Stenlund,
M Stepanov,
A Ster,
S P Stoll,
T Sugitate,
C Suire,
A Sukhanov,
J Sziklai,
E M Takagui,
A Taketani,
R Tanabe,
Y Tanaka,
S Taneja,
K Tanida,
M J Tannenbaum,
A Taranenko,
P Tarján,
H Themann,
T L Thomas,
M Togawa,
A Toia,
L Tomásek,
Y Tomita,
H Torii,
R S Towell,
V-N Tram,
I Tserruya,
Y Tsuchimoto,
C Vale,
H Valle,
H W van Hecke,
A Veicht,
J Velkovska,
R Vertesi,
A A Vinogradov,
M Virius,
V Vrba,
E Vznuzdaev,
D Walker,
X R Wang,
Y Watanabe,
F Wei,
J Wessels,
S N White,
S Williamson,
D Winter,
C L Woody,
M Wysocki,
W Xie,
Y L Yamaguchi,
K Yamaura,
R Yang,
A Yanovich,
J Ying,
S Yokkaichi,
G R Young,
I Younus,
I E Yushmanov,
W A Zajc,
O Zaudtke,
C Zhang,
S Zhou,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
The double helicity asymmetry in neutral pion production for p_{T}=1 to 12 GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, DeltaG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of mu;{2}=4 GeV2 a next to leading order QCD analysis gives DeltaG;{[0.02,0.3]}=0.2, with a constraint of -0.7<DeltaG;{[0.02,0.3]}<0.5 at Deltachi;{2}=9 ( approximately 3sigma) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the DeltaG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.
A Adare,
S Afanasiev,
C Aidala,
N N Ajitanand,
Y Akiba,
H Al-Bataineh,
J Alexander,
A Al-Jamel,
K Aoki,
L Aphecetche,
R Armendariz,
S H Aronson,
J Asai,
E T Atomssa,
R Averbeck,
T C Awes,
B Azmoun,
V Babintsev,
G Baksay,
L Baksay,
A Baldisseri,
K N Barish,
P D Barnes,
B Bassalleck,
S Bathe,
S Batsouli,
V Baublis,
F Bauer,
A Bazilevsky,
S Belikov,
R Bennett,
Y Berdnikov,
A A Bickley,
M T Bjorndal,
J G Boissevain,
H Borel,
K Boyle,
M L Brooks,
D S Brown,
D Bucher,
H Buesching,
V Bumazhnov,
G Bunce,
J M Burward-Hoy,
S Butsyk,
S Campbell,
J-S Chai,
B S Chang,
J-L Charvet,
S Chernichenko,
J Chiba,
C Y Chi,
M Chiu,
I J Choi,
T Chujo,
P Chung,
A Churyn,
V Cianciolo,
C R Cleven,
Y Cobigo,
B A Cole,
M P Comets,
P Constantin,
M Csanád,
T Csörgo,
T Dahms,
K Das,
G David,
M B Deaton,
K Dehmelt,
H Delagrange,
A Denisov,
D d'Enterria,
A Deshpande,
E J Desmond,
O Dietzsch,
A Dion,
M Donadelli,
J L Drachenberg,
O Drapier,
A Drees,
A K Dubey,
A Durum,
V Dzhordzhadze,
Y V Efremenko,
J Egdemir,
F Ellinghaus,
W S Emam,
A Enokizono,
H En'yo,
B Espagnon,
S Esumi,
K O Eyser,
D E Fields,
M Finger,
M Finger Jr,
F Fleuret,
S L Fokin,
B Forestier,
Z Fraenkel,
J E Frantz,
A Franz,
A D Frawley,
K Fujiwara,
Y Fukao,
S-Y Fung,
T Fusayasu,
S Gadrat,
I Garishvili,
F Gastineau,
M Germain,
A Glenn,
H Gong,
M Gonin,
J Gosset,
Y Goto,
R Granier de Cassagnac,
N Grau,
S V Greene,
M Grosse Perdekamp,
T Gunji,
H-A Gustafsson,
T Hachiya,
A Hadj Henni,
C Haegemann,
J S Haggerty,
M N Hagiwara,
H Hamagaki,
R Han,
H Harada,
E P Hartouni,
K Haruna,
M Harvey,
E Haslum,
K Hasuko,
R Hayano,
M Heffner,
T K Hemmick,
T Hester,
J M Heuser,
X He,
H Hiejima,
J C Hill,
R Hobbs,
M Hohlmann,
M Holmes,
W Holzmann,
K Homma,
B Hong,
T Horaguchi,
D Hornback,
M G Hur,
T Ichihara,
K Imai,
J Imrek,
M Inaba,
Y Inoue,
D Isenhower,
L Isenhower,
M Ishihara,
T Isobe,
M Issah,
A Isupov,
B V Jacak,
J Jia,
J Jin,
O Jinnouchi,
B M Johnson,
K S Joo,
D Jouan,
F Kajihara,
S Kametani,
N Kamihara,
J Kamin,
M Kaneta,
J H Kang,
H Kanou,
T Kawagishi,
D Kawall,
A V Kazantsev,
S Kelly,
A Khanzadeev,
J Kikuchi,
D H Kim,
D J Kim,
E Kim,
Y-S Kim,
E Kinney,
A Kiss,
E Kistenev,
A Kiyomichi,
J Klay,
C Klein-Boesing,
L Kochenda,
V Kochetkov,
B Komkov,
M Konno,
D Kotchetkov,
A Kozlov,
A Král,
A Kravitz,
P J Kroon,
J Kubart,
G J Kunde,
N Kurihara,
K Kurita,
M J Kweon,
Y Kwon,
G S Kyle,
R Lacey,
Y-S Lai,
J G Lajoie,
A Lebedev,
Y Le Bornec,
S Leckey,
D M Lee,
M K Lee,
T Lee,
M J Leitch,
M A L Leite,
B Lenzi,
H Lim,
T Liska,
A Litvinenko,
M X Liu,
X Li,
X H Li,
B Love,
D Lynch,
C F Maguire,
Y I Makdisi,
A Malakhov,
M D Malik,
V I Manko,
Y Mao,
L Masek,
H Masui,
F Matathias,
M C McCain,
M McCumber,
P L McGaughey,
Y Miake,
P Mikes,
K Miki,
T E Miller,
A Milov,
S Mioduszewski,
G C Mishra,
M Mishra,
J T Mitchell,
M Mitrovski,
A Morreale,
D P Morrison,
J M Moss,
T V Moukhanova,
D Mukhopadhyay,
J Murata,
S Nagamiya,
Y Nagata,
J L Nagle,
M Naglis,
I Nakagawa,
Y Nakamiya,
T Nakamura,
K Nakano,
J Newby,
M Nguyen,
B E Norman,
A S Nyanin,
J Nystrand,
E O'Brien,
S X Oda,
C A Ogilvie,
H Ohnishi,
I D Ojha,
H Okada,
K Okada,
M Oka,
O O Omiwade,
A Oskarsson,
I Otterlund,
M Ouchida,
K Ozawa,
R Pak,
D Pal,
A P T Palounek,
V Pantuev,
V Papavassiliou,
J Park,
W J Park,
S F Pate,
H Pei,
J-C Peng,
H Pereira,
V Peresedov,
D Yu Peressounko,
C Pinkenburg,
R P Pisani,
M L Purschke,
A K Purwar,
H Qu,
J Rak,
A Rakotozafindrabe,
I Ravinovich,
K F Read,
S Rembeczki,
M Reuter,
K Reygers,
V Riabov,
Y Riabov,
G Roche,
A Romana,
M Rosati,
S S E Rosendahl,
P Rosnet,
P Rukoyatkin,
V L Rykov,
S S Ryu,
B Sahlmueller,
N Saito,
T Sakaguchi,
S Sakai,
H Sakata,
V Samsonov,
H D Sato,
S Sato,
S Sawada,
J Seele,
R Seidl,
V Semenov,
R Seto,
D Sharma,
T K Shea,
I Shein,
A Shevel,
T-A Shibata,
K Shigaki,
M Shimomura,
T Shohjoh,
K Shoji,
A Sickles,
C L Silva,
D Silvermyr,
C Silvestre,
K S Sim,
C P Singh,
V Singh,
S Skutnik,
M Slunecka,
W C Smith,
A Soldatov,
R A Soltz,
W E Sondheim,
S P Sorensen,
I V Sourikova,
F Staley,
P W Stankus,
E Stenlund,
M Stepanov,
A Ster,
S P Stoll,
T Sugitate,
C Suire,
J P Sullivan,
J Sziklai,
T Tabaru,
S Takagi,
E M Takagui,
A Taketani,
K H Tanaka,
Y Tanaka,
K Tanida,
M J Tannenbaum,
A Taranenko,
P Tarján,
T L Thomas,
M Togawa,
A Toia,
J Tojo,
L Tomásek,
H Torii,
R S Towell,
V-N Tram,
I Tserruya,
Y Tsuchimoto,
S K Tuli,
H Tydesjö,
N Tyurin,
C Vale,
H Valle,
H W van Hecke,
J Velkovska,
R Vertesi,
A A Vinogradov,
M Virius,
V Vrba,
E Vznuzdaev,
M Wagner,
D Walker,
X R Wang,
Y Watanabe,
J Wessels,
S N White,
N Willis,
D Winter,
C L Woody,
M Wysocki,
W Xie,
Y L Yamaguchi,
A Yanovich,
Z Yasin,
J Ying,
S Yokkaichi,
G R Young,
I Younus,
I E Yushmanov,
W A Zajc,
O Zaudtke,
C Zhang,
S Zhou,
J Zimányi,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
For Au+Au collisions at 200 GeV, we measure neutral pion production with good statistics for transverse momentum, p_{T}, up to 20 GeV/c. A fivefold suppression is found, which is essentially constant for 5<p_{T}<20 GeV/c. Experimental uncertainties are small enough to constrain any model-dependent parametrization for the transport coefficient of the medium, e.g., q[over ;] in the parton quenching model. The spectral shape is similar for all collision classes, and the suppression does not saturate in Au+Au collisions.
A Adare,
S Afanasiev,
C Aidala,
N N Ajitanand,
Y Akiba,
H Al-Bataineh,
J Alexander,
K Aoki,
L Aphecetche,
R Armendariz,
S H Aronson,
J Asai,
E T Atomssa,
R Averbeck,
T C Awes,
B Azmoun,
V Babintsev,
M Bai,
G Baksay,
L Baksay,
A Baldisseri,
K N Barish,
P D Barnes,
B Bassalleck,
A T Basye,
S Bathe,
S Batsouli,
V Baublis,
C Baumann,
A Bazilevsky,
S Belikov,
R Bennett,
A Berdnikov,
Y Berdnikov,
A A Bickley,
J G Boissevain,
H Borel,
K Boyle,
M L Brooks,
H Buesching,
V Bumazhnov,
G Bunce,
S Butsyk,
C M Camacho,
S Campbell,
B S Chang,
W C Chang,
J-L Charvet,
S Chernichenko,
J Chiba,
C Y Chi,
M Chiu,
I J Choi,
R K Choudhury,
T Chujo,
P Chung,
A Churyn,
V Cianciolo,
Z Citron,
C R Cleven,
B A Cole,
M P Comets,
P Constantin,
M Csanád,
T Csörgo,
T Dahms,
S Dairaku,
K Das,
G David,
M B Deaton,
K Dehmelt,
H Delagrange,
A Denisov,
D d'Enterria,
A Deshpande,
E J Desmond,
O Dietzsch,
A Dion,
M Donadelli,
O Drapier,
A Drees,
K A Drees,
A K Dubey,
A Durum,
D Dutta,
V Dzhordzhadze,
Y V Efremenko,
J Egdemir,
F Ellinghaus,
W S Emam,
T Engelmore,
A Enokizono,
H En'yo,
S Esumi,
K O Eyser,
B Fadem,
D E Fields,
M Finger Jr,
M Finger,
F Fleuret,
S L Fokin,
Z Fraenkel,
J E Frantz,
A Franz,
A D Frawley,
K Fujiwara,
Y Fukao,
T Fusayasu,
S Gadrat,
I Garishvili,
A Glenn,
H Gong,
M Gonin,
J Gosset,
Y Goto,
R Granier de Cassagnac,
N Grau,
S V Greene,
M Grosse Perdekamp,
T Gunji,
H-A Gustafsson,
T Hachiya,
A Hadj Henni,
C Haegemann,
J S Haggerty,
H Hamagaki,
R Han,
H Harada,
E P Hartouni,
K Haruna,
E Haslum,
R Hayano,
M Heffner,
T K Hemmick,
T Hester,
X He,
H Hiejima,
J C Hill,
R Hobbs,
M Hohlmann,
W Holzmann,
K Homma,
B Hong,
T Horaguchi,
D Hornback,
S Huang,
T Ichihara,
R Ichimiya,
Y Ikeda,
K Imai,
J Imrek,
M Inaba,
Y Inoue,
D Isenhower,
L Isenhower,
M Ishihara,
T Isobe,
M Issah,
A Isupov,
D Ivanischev,
B V Jacak,
J Jia,
J Jin,
O Jinnouchi,
B M Johnson,
K S Joo,
D Jouan,
F Kajihara,
S Kametani,
N Kamihara,
J Kamin,
M Kaneta,
J H Kang,
H Kanou,
J Kapustinsky,
D Kawall,
A V Kazantsev,
T Kempel,
A Khanzadeev,
K M Kijima,
J Kikuchi,
B I Kim,
D H Kim,
D J Kim,
E Kim,
S H Kim,
E Kinney,
K Kiriluk,
A Kiss,
E Kistenev,
A Kiyomichi,
J Klay,
C Klein-Boesing,
L Kochenda,
V Kochetkov,
B Komkov,
M Konno,
J Koster,
D Kotchetkov,
A Kozlov,
A Král,
A Kravitz,
J Kubart,
G J Kunde,
N Kurihara,
K Kurita,
M Kurosawa,
M J Kweon,
Y Kwon,
G S Kyle,
R Lacey,
Y-S Lai,
Y S Lai,
J G Lajoie,
D Layton,
A Lebedev,
D M Lee,
K B Lee,
M K Lee,
T Lee,
M J Leitch,
M A L Leite,
B Lenzi,
P Liebing,
T Liska,
A Litvinenko,
H Liu,
M X Liu,
X Li,
B Love,
D Lynch,
C F Maguire,
Y I Makdisi,
A Malakhov,
M D Malik,
V I Manko,
E Mannel,
Y Mao,
L Masek,
H Masui,
F Matathias,
M McCumber,
P L McGaughey,
N Means,
B Meredith,
Y Miake,
P Mikes,
K Miki,
T E Miller,
A Milov,
S Mioduszewski,
M Mishra,
J T Mitchell,
M Mitrovski,
A K Mohanty,
Y Morino,
A Morreale,
D P Morrison,
T V Moukhanova,
D Mukhopadhyay,
J Murata,
S Nagamiya,
Y Nagata,
J L Nagle,
M Naglis,
M I Nagy,
I Nakagawa,
Y Nakamiya,
T Nakamura,
K Nakano,
J Newby,
M Nguyen,
T Niita,
B E Norman,
R Nouicer,
A S Nyanin,
E O'Brien,
S X Oda,
C A Ogilvie,
H Ohnishi,
H Okada,
K Okada,
M Oka,
O O Omiwade,
Y Onuki,
A Oskarsson,
M Ouchida,
K Ozawa,
R Pak,
D Pal,
A P T Palounek,
V Pantuev,
V Papavassiliou,
J Park,
W J Park,
S F Pate,
H Pei,
J-C Peng,
H Pereira,
V Peresedov,
D Yu Peressounko,
C Pinkenburg,
M L Purschke,
A K Purwar,
H Qu,
J Rak,
A Rakotozafindrabe,
I Ravinovich,
K F Read,
S Rembeczki,
M Reuter,
K Reygers,
V Riabov,
Y Riabov,
D Roach,
G Roche,
S D Rolnick,
A Romana,
M Rosati,
S S E Rosendahl,
P Rosnet,
P Rukoyatkin,
P Ruzicka,
V L Rykov,
B Sahlmueller,
N Saito,
T Sakaguchi,
S Sakai,
K Sakashita,
H Sakata,
V Samsonov,
S Sato,
T Sato,
S Sawada,
K Sedgwick,
J Seele,
R Seidl,
A Yu Semenov,
V Semenov,
R Seto,
D Sharma,
I Shein,
A Shevel,
T-A Shibata,
K Shigaki,
M Shimomura,
K Shoji,
P Shukla,
A Sickles,
C L Silva,
D Silvermyr,
C Silvestre,
K S Sim,
B K Singh,
C P Singh,
V Singh,
S Skutnik,
M Slunecka,
A Soldatov,
R A Soltz,
W E Sondheim,
S P Sorensen,
I V Sourikova,
F Staley,
P W Stankus,
E Stenlund,
M Stepanov,
A Ster,
S P Stoll,
T Sugitate,
C Suire,
A Sukhanov,
J Sziklai,
T Tabaru,
S Takagi,
E M Takagui,
A Taketani,
R Tanabe,
Y Tanaka,
K Tanida,
M J Tannenbaum,
A Taranenko,
P Tarján,
H Themann,
T L Thomas,
M Togawa,
A Toia,
J Tojo,
L Tomásek,
Y Tomita,
H Torii,
R S Towell,
V-N Tram,
I Tserruya,
Y Tsuchimoto,
C Vale,
H Valle,
H W Vanhecke,
A Veicht,
J Velkovska,
R Vertesi,
A A Vinogradov,
M Virius,
V Vrba,
E Vznuzdaev,
M Wagner,
D Walker,
X R Wang,
Y Watanabe,
F Wei,
J Wessels,
S N White,
D Winter,
C L Woody,
M Wysocki,
W Xie,
Y L Yamaguchi,
K Yamaura,
R Yang,
A Yanovich,
Z Yasin,
J Ying,
S Yokkaichi,
G R Young,
I Younus,
I E Yushmanov,
W A Zajc,
O Zaudtke,
C Zhang,
S Zhou,
J Zimányi,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
Neutral pion transverse momentum (p_{T}) spectra at midrapidity (|y| less, similar0.35) were measured in Cu+Cu collisions at sqrt[s_{NN}]=22.4, 62.4, and 200 GeV. Relative to pi;{0} yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (N_{coll}) the pi;{0} yields for p_{T} greater, similar2 GeV/c in central Cu+Cu collisions are suppressed at 62.4 and 200 GeV whereas an enhancement is observed at 22.4 GeV. A comparison with a jet-quenching model suggests that final state parton energy loss dominates in central Cu+Cu collisions at 62.4 and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.
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