| author name | recommending | commenting | favorite | papers | recom. | cited | |
|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 5 | 0 | 1 | [Update] |
Latest Paper:
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 Csörgő,
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,
R Granier de Cassagnac,
N Grau,
S V Greene,
G Grim,
M Grosse Perdekamp,
T Gunji,
H-Å Gustafsson,
A Hadj Henni,
J S Haggerty,
K I Hahn,
H Hamagaki,
J Hamblen,
R Han,
J Hanks,
E P Hartouni,
K Haruna,
E Haslum,
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,
X Jiang,
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,
A V Kazantsev,
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,
A Kiss,
E Kistenev,
J Klay,
C Klein-Boesing,
L Kochenda,
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,
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,
P L McGaughey,
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,
T Niita,
R Nouicer,
A S Nyanin,
C Oakley,
E O'Brien,
S X Oda,
C A Ogilvie,
M Oka,
K Okada,
Y Onuki,
A Oskarsson,
M Ouchida,
K Ozawa,
R Pak,
A P T Palounek,
V Pantuev,
V Papavassiliou,
I H Park,
J Park,
S K Park,
W J Park,
S F Pate,
H Pei,
J-C Peng,
H Pereira,
V Peresedov,
D Yu Peressounko,
R Petti,
C Pinkenburg,
R P Pisani,
M Proissl,
M L Purschke,
A K Purwar,
H Qu,
J Rak,
A Rakotozafindrabe,
I Ravinovich,
K F Read,
S Rembeczki,
K Reygers,
V Riabov,
Y Riabov,
E Richardson,
D Roach,
G Roche,
S D Rolnick,
M Rosati,
C A Rosen,
S S E Rosendahl,
P Rosnet,
P Rukoyatkin,
P Ružička,
V L Rykov,
B Sahlmueller,
N Saito,
T Sakaguchi,
S Sakai,
K Sakashita,
V Samsonov,
S Sano,
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 Slunečka,
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,
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.
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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