| author name | recommending | commenting | favorite | papers | recom. | cited | |
|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 27 | 0 | 11 | [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,
Y Aramaki,
E T Atomssa,
R Averbeck,
T C Awes,
B Azmoun,
V Babintsev,
M Bai,
G Baksay,
L Baksay,
K N Barish,
B Bassalleck,
A T Basye,
S Bathe,
V Baublis,
C Baumann,
A Bazilevsky,
S Belikov,
R Belmont,
R Bennett,
A Berdnikov,
Y Berdnikov,
J H Bhom,
D S Blau,
J S Bok,
K Boyle,
M L Brooks,
H Buesching,
V Bumazhnov,
G Bunce,
S Butsyk,
S Campbell,
A Caringi,
C-H Chen,
C Y Chi,
M Chiu,
I J Choi,
J B Choi,
R K Choudhury,
P Christiansen,
T Chujo,
P Chung,
O Chvala,
V Cianciolo,
Z Citron,
B A Cole,
Z Conesa Del Valle,
M Connors,
M Csanád,
T Csörgő,
T Dahms,
S Dairaku,
I Danchev,
K Das,
A Datta,
G David,
M K Dayananda,
A Denisov,
A Deshpande,
E J Desmond,
K V Dharmawardane,
O Dietzsch,
A Dion,
M Donadelli,
O Drapier,
A Drees,
K A Drees,
J M Durham,
A Durum,
D Dutta,
L D'Orazio,
S Edwards,
Y V Efremenko,
F Ellinghaus,
T Engelmore,
A Enokizono,
H En'yo,
S Esumi,
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,
Y Goto,
R Granier de Cassagnac,
N Grau,
S V Greene,
G Grim,
M Grosse Perdekamp,
T Gunji,
H-Å Gustafsson,
J S Haggerty,
K I Hahn,
H Hamagaki,
J Hamblen,
R Han,
J Hanks,
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,
Y Ikeda,
K Imai,
M Inaba,
D Isenhower,
M Ishihara,
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,
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 J Kim,
E J Kim,
Y-J Kim,
E Kinney,
A Kiss,
E Kistenev,
L Kochenda,
B Komkov,
M Konno,
J Koster,
A Král,
A Kravitz,
G J Kunde,
K Kurita,
M Kurosawa,
Y Kwon,
G S Kyle,
R Lacey,
Y S Lai,
J G Lajoie,
A Lebedev,
D M Lee,
J Lee,
K B Lee,
K S Lee,
M J Leitch,
M A L Leite,
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,
H Masui,
F Matathias,
M McCumber,
P L McGaughey,
N Means,
B Meredith,
Y Miake,
T Mibe,
A C Mignerey,
K Miki,
A Milov,
J T Mitchell,
A K Mohanty,
H J Moon,
Y Morino,
A Morreale,
D P Morrison,
T V Moukhanova,
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,
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,
V Pantuev,
V Papavassiliou,
I H 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,
H Qu,
J Rak,
I Ravinovich,
K F Read,
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 Rukoyatkin,
P Ružička,
B Sahlmueller,
N Saito,
T Sakaguchi,
K Sakashita,
V Samsonov,
S Sano,
T Sato,
S Sawada,
K Sedgwick,
J Seele,
R Seidl,
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,
R A Soltz,
W E Sondheim,
S P Sorensen,
I V Sourikova,
P W Stankus,
E Stenlund,
S P Stoll,
T Sugitate,
A Sukhanov,
J Sziklai,
E M Takagui,
A Taketani,
R Tanabe,
Y Tanaka,
S Taneja,
K Tanida,
M J Tannenbaum,
S Tarafdar,
A Taranenko,
H Themann,
D Thomas,
T L Thomas,
M Togawa,
A Toia,
L Tomášek,
H Torii,
R S Towell,
I Tserruya,
Y Tsuchimoto,
C Vale,
H Valle,
H W van Hecke,
E Vazquez-Zambrano,
A Veicht,
J Velkovska,
R Vértesi,
M Virius,
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,
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,
S Zhou,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
Back-to-back hadron pair yields in d+Au and p+p collisions at sqrt[s_{NN}]=200 GeV were measured with the PHENIX detector at the Relativistic Heavy Ion Collider. Rapidity separated hadron pairs were detected with the trigger hadron at pseudorapidity |η|<0.35 and the associated hadron at forward rapidity (deuteron direction, 3.0<η<3.8). Pairs were also detected with both hadrons measured at forward rapidity; in this case, the yield of back-to-back hadron pairs in d+Au collisions with small impact parameters is observed to be suppressed by a factor of 10 relative to p+p collisions. The kinematics of these pairs is expected to probe partons in the Au nucleus with a low fraction x of the nucleon momenta, where the gluon densities rise sharply. The observed suppression as a function of nuclear thickness, p_{T}, and η points to cold nuclear matter effects arising at high parton densities.
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,
R Akimoto,
J Alexander,
H Al-Ta'ani,
K R Andrews,
A Angerami,
K Aoki,
N Apadula,
E Appelt,
Y Aramaki,
R Armendariz,
E C Aschenauer,
T C Awes,
B Azmoun,
V Babintsev,
M Bai,
B Bannier,
K N Barish,
B Bassalleck,
A T Basye,
S Bathe,
V Baublis,
C Baumann,
A Bazilevsky,
R Belmont,
J Ben-Benjamin,
R Bennett,
A Berdnikov,
Y Berdnikov,
D S Blau,
J S Bok,
K Boyle,
M L Brooks,
D Broxmeyer,
H Buesching,
V Bumazhnov,
G Bunce,
S Butsyk,
S Campbell,
A Caringi,
P Castera,
C-H Chen,
C Y Chi,
M Chiu,
I J Choi,
J B Choi,
R K Choudhury,
P Christiansen,
T Chujo,
O Chvala,
V Cianciolo,
Z Citron,
B A Cole,
Z Conesa del Valle,
M Connors,
M Csanád,
T Csörgo,
S Dairaku,
A Datta,
G David,
M K Dayananda,
A Denisov,
A Deshpande,
E J Desmond,
K V Dharmawardane,
O Dietzsch,
A Dion,
M Donadelli,
L D'Orazio,
O Drapier,
A Drees,
K A Drees,
J M Durham,
A Durum,
Y V Efremenko,
T Engelmore,
A Enokizono,
H En'yo,
S Esumi,
B Fadem,
D E Fields,
M Finger Jr,
M Finger,
F Fleuret,
S L Fokin,
J E Frantz,
A Franz,
A D Frawley,
Y Fukao,
T Fusayasu,
I Garishvili,
A Glenn,
X Gong,
M Gonin,
Y Goto,
R Granier de Cassagnac,
N Grau,
S V Greene,
M Grosse Perdekamp,
T Gunji,
L Guo,
H-Å Gustafsson,
J S Haggerty,
K I Hahn,
H Hamagaki,
J Hamblen,
J Hanks,
R Han,
C Harper,
K Hashimoto,
E Haslum,
R Hayano,
T K Hemmick,
T Hester,
X He,
J C Hill,
R S Hollis,
W Holzmann,
K Homma,
B Hong,
T Horaguchi,
Y Hori,
D Hornback,
S Huang,
T Ichihara,
R Ichimiya,
H Iinuma,
Y Ikeda,
K Imai,
M Inaba,
A Iordanova,
D Isenhower,
M Ishihara,
M Issah,
A Isupov,
D Ivanischev,
Y Iwanaga,
B V Jacak,
J Jia,
X Jiang,
B M Johnson,
T Jones,
K S Joo,
D Jouan,
J Kamin,
S Kaneti,
B H Kang,
J H Kang,
J S Kang,
J Kapustinsky,
K Karatsu,
M Kasai,
D Kawall,
A V Kazantsev,
T Kempel,
A Khanzadeev,
K M Kijima,
B I Kim,
D J Kim,
E J Kim,
Y-J Kim,
Y K Kim,
E Kinney,
Á Kiss,
E Kistenev,
D Kleinjan,
P Kline,
L Kochenda,
B Komkov,
M Konno,
J Koster,
D Kotov,
A Král,
G J Kunde,
K Kurita,
M Kurosawa,
Y Kwon,
G S Kyle,
R Lacey,
Y S Lai,
J G Lajoie,
A Lebedev,
D M Lee,
J Lee,
K B Lee,
K S Lee,
S H Lee,
S R Lee,
M J Leitch,
M A L Leite,
P Lichtenwalner,
S H Lim,
L A Linden Levy,
A Litvinenko,
H Liu,
M X Liu,
X Li,
B Love,
D Lynch,
C F Maguire,
Y I Makdisi,
A Malakhov,
A Manion,
V I Manko,
E Mannel,
Y Mao,
H Masui,
M McCumber,
P L McGaughey,
D McGlinchey,
C McKinney,
N Means,
M Mendoza,
B Meredith,
Y Miake,
T Mibe,
A C Mignerey,
K Miki,
A Milov,
J T Mitchell,
Y Miyachi,
A K Mohanty,
H J Moon,
Y Morino,
A Morreale,
D P Morrison,
S Motschwiller,
T V Moukhanova,
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,
J Newby,
M Nguyen,
M Nihashi,
R Nouicer,
A S Nyanin,
C Oakley,
E O'Brien,
C A Ogilvie,
K Okada,
M Oka,
A Oskarsson,
M Ouchida,
K Ozawa,
R Pak,
V Pantuev,
V Papavassiliou,
B H Park,
I H Park,
S K 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,
H Qu,
J Rak,
I Ravinovich,
K F Read,
K Reygers,
V Riabov,
Y Riabov,
E Richardson,
D Roach,
G Roche,
S D Rolnick,
M Rosati,
S S E Rosendahl,
P Rukoyatkin,
B Sahlmueller,
N Saito,
T Sakaguchi,
V Samsonov,
S Sano,
M Sarsour,
T Sato,
M Savastio,
S Sawada,
K Sedgwick,
R Seidl,
R Seto,
D Sharma,
I Shein,
T-A Shibata,
K Shigaki,
H H Shim,
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,
T Sodre,
R A Soltz,
W E Sondheim,
S P Sorensen,
I V Sourikova,
P W Stankus,
E Stenlund,
S P Stoll,
T Sugitate,
A Sukhanov,
J Sun,
J Sziklai,
E M Takagui,
A Takahara,
A Taketani,
R Tanabe,
Y Tanaka,
S Taneja,
K Tanida,
M J Tannenbaum,
S Tarafdar,
A Taranenko,
E Tennant,
H Themann,
D Thomas,
M Togawa,
L Tomášek,
M Tomášek,
H Torii,
R S Towell,
I Tserruya,
Y Tsuchimoto,
K Utsunomiya,
C Vale,
H W van Hecke,
E Vazquez-Zambrano,
A Veicht,
J Velkovska,
R Vértesi,
M Virius,
A Vossen,
V Vrba,
E Vznuzdaev,
X R Wang,
D Watanabe,
K Watanabe,
Y Watanabe,
Y S Watanabe,
F Wei,
R Wei,
J Wessels,
S N White,
D Winter,
C L Woody,
R M Wright,
M Wysocki,
Y L Yamaguchi,
R Yang,
A Yanovich,
J Ying,
S Yokkaichi,
J S Yoo,
G R Young,
I Younus,
Z You,
I E Yushmanov,
W A Zajc,
A Zelenski,
S Zhou,
L Zolin
University of Colorado, Boulder, Colorado 80309, USA.
Large parity-violating longitudinal single-spin asymmetries A(L)(e+)=-0.86(-0.14)(+0.30) and A(L)(e-)= 0.88(-0.71)(+0.12) are observed for inclusive high transverse momentum electrons and positrons in polarized p+p collisions at a center-of-mass energy of sqrt[s]= 500 GeV with the PHENIX detector at RHIC. These e± come mainly from the decay of W± and Z0 bosons, and their asymmetries directly demonstrate parity violation in the couplings of the W± to the light quarks. The observed electron and positron yields were used to estimate W± boson production cross sections for the e± channels of σ(pp → W+ X) × BR(W+ → e+ ν(e))= 144.1 ± 21.2(stat)(-10.3)(+3.4)(syst) ± 21.6(norm) pb, and σ(pp → W- X) × BR(W- → e- ν[over ¯](e))= 31.7 ± 12.1(stat)(-8.2)(+10.1)(syst) ± 4.8(norm) pb.
J Lachniet,
A Afanasev,
H Arenhövel,
W K Brooks,
G P Gilfoyle,
D Higinbotham,
S Jeschonnek,
B Quinn,
M F Vineyard,
G Adams,
K P Adhikari,
M J Amaryan,
M Anghinolfi,
B Asavapibhop,
G Asryan,
H Avakian,
H Bagdasaryan,
N Baillie,
J P Ball,
N A Baltzell,
S Barrow,
V Batourine,
M Battaglieri,
K Beard,
I Bedlinskiy,
M Bektasoglu,
M Bellis,
N Benmouna,
B L Berman,
A S Biselli,
B E Bonner,
C Bookwalter,
S Bouchigny,
S Boiarinov,
R Bradford,
D Branford,
W J Briscoe,
S Bültmann,
V D Burkert,
J R Calarco,
S L Careccia,
D S Carman,
L Casey,
L Cheng,
P L Cole,
A Coleman,
P Collins,
D Cords,
P Corvisiero,
D Crabb,
V Crede,
J P Cummings,
D Dale,
A Daniel,
N Dashyan,
R De Masi,
R De Vita,
E De Sanctis,
P V Degtyarenko,
H Denizli,
L Dennis,
A Deur,
S Dhamija,
K V Dharmawardane,
K S Dhuga,
R Dickson,
C Djalali,
G E Dodge,
D Doughty,
P Dragovitsch,
M Dugger,
S Dytman,
O P Dzyubak,
H Egiyan,
K S Egiyan,
L El Fassi,
L Elouadrhiri,
A Empl,
P Eugenio,
R Fatemi,
G Fedotov,
R Fersch,
R J Feuerbach,
T A Forest,
A Fradi,
M Y Gabrielyan,
M Garçon,
G Gavalian,
N Gevorgyan,
K L Giovanetti,
F X Girod,
J T Goetz,
W Gohn,
E Golovatch,
R W Gothe,
L Graham,
K A Griffioen,
M Guidal,
M Guillo,
N Guler,
L Guo,
V Gyurjyan,
C Hadjidakis,
K Hafidi,
H Hakobyan,
C Hanretty,
J Hardie,
N Hassall,
D Heddle,
F W Hersman,
K Hicks,
I Hleiqawi,
M Holtrop,
J Hu,
M Huertas,
C E Hyde-Wright,
Y Ilieva,
D G Ireland,
B S Ishkhanov,
E L Isupov,
M M Ito,
D Jenkins,
H S Jo,
J R Johnstone,
K Joo,
H G Juengst,
T Kageya,
N Kalantarians,
D Keller,
J D Kellie,
M Khandaker,
P Khetarpal,
K Y Kim,
K Kim,
W Kim,
A Klein,
F J Klein,
M Klusman,
P Konczykowski,
M Kossov,
L H Kramer,
V Kubarovsky,
J Kuhn,
S E Kuhn,
S V Kuleshov,
V Kuznetsov,
J M Laget,
J Langheinrich,
D Lawrence,
A C S Lima,
K Livingston,
M Lowry,
H Y Lu,
K Lukashin,
M Maccormick,
S Malace,
J J Manak,
N Markov,
P Mattione,
S McAleer,
M E McCracken,
B McKinnon,
J W C McNabb,
B A Mecking,
M D Mestayer,
C A Meyer,
T Mibe,
K Mikhailov,
T Mineeva,
R Minehart,
M Mirazita,
R Miskimen,
V Mokeev,
B Moreno,
K Moriya,
S A Morrow,
M Moteabbed,
J Mueller,
E Munevar,
G S Mutchler,
P Nadel-Turonski,
R Nasseripour,
S Niccolai,
G Niculescu,
I Niculescu,
B B Niczyporuk,
M R Niroula,
R A Niyazov,
M Nozar,
G V O'Rielly,
M Osipenko,
A I Ostrovidov,
K Park,
S Park,
E Pasyuk,
C Paterson,
S Anefalos Pereira,
S A Philips,
J Pierce,
N Pivnyuk,
D Pocanic,
O Pogorelko,
E Polli,
I Popa,
S Pozdniakov,
B M Preedom,
J W Price,
Y Prok,
D Protopopescu,
L M Qin,
B A Raue,
G Riccardi,
G Ricco,
M Ripani,
B G Ritchie,
G Rosner,
P Rossi,
D Rowntree,
P D Rubin,
F Sabatié,
M S Saini,
J Salamanca,
C Salgado,
A Sandorfi,
J P Santoro,
V Sapunenko,
D Schott,
R A Schumacher,
V S Serov,
Y G Sharabian,
D Sharov,
J Shaw,
N V Shvedunov,
A V Skabelin,
E S Smith,
L C Smith,
D I Sober,
D Sokhan,
A Starostin,
A Stavinsky,
S Stepanyan,
S S Stepanyan,
B E Stokes,
P Stoler,
K A Stopani,
I I Strakovsky,
S Strauch,
R Suleiman,
M Taiuti,
S Taylor,
D J Tedeschi,
R Thompson,
A Tkabladze,
S Tkachenko,
M Ungaro,
A V Vlassov,
D P Watts,
X Wei,
L B Weinstein,
D P Weygand,
M Williams,
E Wolin,
M H Wood,
A Yegneswaran,
J Yun,
M Yurov,
L Zana,
J Zhang,
B Zhao,
Z W Zhao
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA and Old Dominion University, Norfolk, Virginia 23529, USA.
The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic calorimeters and time-of-flight scintillators at two beam energies. The dipole parametrization gives a good description of the data.
M Nozar,
C Salgado,
D P Weygand,
L Guo,
G Adams,
Ji Li,
P Eugenio,
M J Amaryan,
M Anghinolfi,
G Asryan,
H Avakian,
H Bagdasaryan,
N Baillie,
J P Ball,
N A Baltzell,
S Barrow,
M Battaglieri,
I Bedlinskiy,
M Bektasoglu,
M Bellis,
N Benmouna,
B L Berman,
A S Biselli,
L Blaszczyk,
B E Bonner,
S Bouchigny,
S Boiarinov,
R Bradford,
D Branford,
W J Briscoe,
W K Brooks,
S Bültmann,
V D Burkert,
C Butuceanu,
J R Calarco,
S L Careccia,
D S Carman,
B Carnahan,
L Casey,
A Cazes,
S Chen,
L Cheng,
P L Cole,
P Collins,
P Coltharp,
D Cords,
P Corvisiero,
D Crabb,
H Crannell,
V Crede,
J P Cummings,
D Dale,
N Dashyan,
R De Masi,
R De Vita,
E De Sanctis,
P V Degtyarenko,
H Denizli,
L Dennis,
A Deur,
K V Dharmawardane,
K S Dhuga,
R Dickson,
C Djalali,
G E Dodge,
D Doughty,
M Dugger,
S Dytman,
O P Dzyubak,
H Egiyan,
K S Egiyan,
L El Fassi,
L Elouadrhiri,
R Fatemi,
G Fedotov,
R J Feuerbach,
T A Forest,
A Fradi,
H Funsten,
M Garçon,
G Gavalian,
N Gevorgyan,
G P Gilfoyle,
K L Giovanetti,
F X Girod,
J T Goetz,
R W Gothe,
K A Griffioen,
M Guidal,
M Guillo,
N Guler,
V Gyurjyan,
C Hadjidakis,
K Hafidi,
H Hakobyan,
C Hanretty,
J Hardie,
N Hassall,
D Heddle,
F W Hersman,
K Hicks,
I Hleiqawi,
M Holtrop,
C E Hyde-Wright,
Y Ilieva,
D G Ireland,
B S Ishkhanov,
E L Isupov,
M M Ito,
D Jenkins,
H S Jo,
J R Johnstone,
K Joo,
H G Juengst,
N Kalantarians,
J D Kellie,
M Khandaker,
W Kim,
A Klein,
F J Klein,
M Kossov,
Z Krahn,
L H Kramer,
V Kubarovsky,
J Kuhn,
S E Kuhn,
S V Kuleshov,
V Kuznetsov,
J Lachniet,
J M Laget,
J Langheinrich,
D Lawrence,
K Livingston,
H Y Lu,
M Maccormick,
N Markov,
P Mattione,
S McAleer,
B McKinnon,
J W C McNabb,
B A Mecking,
S Mehrabyan,
M D Mestayer,
C A Meyer,
T Mibe,
K Mikhailov,
M Mirazita,
R Miskimen,
V Mokeev,
B Moreno,
K Moriya,
S A Morrow,
M Moteabbed,
J Mueller,
E Munevar,
G S Mutchler,
P Nadel-Turonski,
R Nasseripour,
S Niccolai,
G Niculescu,
I Niculescu,
B B Niczyporuk,
M R Niroula,
R A Niyazov,
G V O'Rielly,
M Osipenko,
A I Ostrovidov,
K Park,
E Pasyuk,
C Paterson,
S Anefalos Pereira,
S A Philips,
J Pierce,
N Pivnyuk,
D Pocanic,
O Pogorelko,
E Polli,
I Popa,
S Pozdniakov,
B M Preedom,
J W Price,
Y Prok,
D Protopopescu,
L M Qin,
B A Raue,
G Riccardi,
G Ricco,
M Ripani,
B G Ritchie,
F Ronchetti,
G Rosner,
P Rossi,
P D Rubin,
F Sabatié,
J Salamanca,
J P Santoro,
V Sapunenko,
R A Schumacher,
V S Serov,
Y G Sharabian,
D Sharov,
N V Shvedunov,
A V Skabelin,
E S Smith,
L C Smith,
D I Sober,
D Sokhan,
A Stavinsky,
S S Stepanyan,
S Stepanyan,
B E Stokes,
P Stoler,
I I Strakovsky,
S Strauch,
M Taiuti,
D J Tedeschi,
U Thoma,
A Tkabladze,
S Tkachenko,
L Todor,
M Ungaro,
M F Vineyard,
A V Vlassov,
D P Watts,
L B Weinstein,
M Williams,
E Wolin,
M H Wood,
A Yegneswaran,
L Zana,
J Zhang,
B Zhao,
Z W Zhao
Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
A search for exotic mesons in the pi;{+}pi;{+}pi;{-} system photoproduced by the charge exchange reaction gammap-->pi;{+}pi;{+}pi;{-}(n) was carried out by the CLAS Collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A partial wave analysis was performed on a sample of 83 000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic J;{PC}=1;{-+} resonant state in the 1 to 2 GeV mass range. Our partial wave analysis shows production of the a_{2}(1320) and the pi_{2}(1670) mesons, but no evidence for the a_{1}(1260), nor the pi_{1}(1600) exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic pi_{1}(1600) cross section, less than 2% of the a_{2}(1320) production.
M Battaglieri,
R De Vita,
A P Szczepaniak,
K P Adhikari,
M Aghasyan,
M J Amaryan,
P Ambrozewicz,
M Anghinolfi,
G Asryan,
H Avakian,
H Bagdasaryan,
N Baillie,
J P Ball,
N A Baltzell,
V Batourine,
I Bedlinskiy,
M Bellis,
N Benmouna,
B L Berman,
L Bibrzycki,
A S Biselli,
C Bookwalter,
S Bouchigny,
S Boiarinov,
R Bradford,
D Branford,
W J Briscoe,
W K Brooks,
S Bültmann,
V D Burkert,
J R Calarco,
S L Careccia,
D S Carman,
L Casey,
S Chen,
L Cheng,
E Clinton,
P L Cole,
P Collins,
D Crabb,
H Crannell,
V Crede,
J P Cummings,
D Dale,
A Daniel,
N Dashyan,
R De Masi,
E De Sanctis,
P V Degtyarenko,
A Deur,
S Dhamija,
K V Dharmawardane,
R Dickson,
C Djalali,
G E Dodge,
J Donnelly,
D Doughty,
M Dugger,
O P Dzyubak,
H Egiyan,
K S Egiyan,
L El Fassi,
L Elouadrhiri,
P Eugenio,
G Fedotov,
R Fersch,
T A Forest,
A Fradi,
M Y Gabrielyan,
L Gan,
M Garçon,
A Gasparian,
G Gavalian,
N Gevorgyan,
G P Gilfoyle,
K L Giovanetti,
F X Girod,
O Glamazdin,
J Goett,
J T Goetz,
W Gohn,
E Golovatch,
C I O Gordon,
R W Gothe,
L Graham,
K A Griffioen,
M Guidal,
N Guler,
L Guo,
V Gyurjyan,
C Hadjidakis,
K Hafidi,
H Hakobyan,
R S Hakobyan,
C Hanretty,
J Hardie,
N Hassall,
D Heddle,
F W Hersman,
K Hicks,
I Hleiqawi,
M Holtrop,
C E Hyde,
Y Ilieva,
D G Ireland,
B S Ishkhanov,
E L Isupov,
M M Ito,
D Jenkins,
H S Jo,
J R Johnstone,
K Joo,
H G Juengst,
T Kageya,
N Kalantarians,
D Keller,
J D Kellie,
M Khandaker,
P Khetarpal,
W Kim,
A Klein,
F J Klein,
A V Klimenko,
P Konczykowski,
M Kossov,
Z Krahn,
L H Kramer,
V Kubarovsky,
J Kuhn,
S E Kuhn,
S V Kuleshov,
V Kuznetsov,
J Lachniet,
J M Laget,
J Langheinrich,
D Lawrence,
T Lee,
L Lesniak,
Ji Li,
K Livingston,
M Lowry,
H Y Lu,
M Maccormick,
S Malace,
N Markov,
P Mattione,
M E McCracken,
B McKinnon,
B A Mecking,
J J Melone,
M D Mestayer,
C A Meyer,
T Mibe,
K Mikhailov,
T Mineeva,
R Minehart,
M Mirazita,
R Miskimen,
V Mochalov,
V Mokeev,
B Moreno,
K Moriya,
S A Morrow,
M Moteabbed,
E Munevar,
G S Mutchler,
P Nadel-Turonski,
I Nakagawa,
R Nasseripour,
S Niccolai,
G Niculescu,
I Niculescu,
B B Niczyporuk,
M R Niroula,
R A Niyazov,
M Nozar,
M Osipenko,
A I Ostrovidov,
K Park,
S Park,
E Pasyuk,
M Paris,
C Paterson,
S Anefalos Pereira,
J Pierce,
N Pivnyuk,
D Pocanic,
O Pogorelko,
S Pozdniakov,
J W Price,
Y Prok,
D Protopopescu,
B A Raue,
G Riccardi,
G Ricco,
M Ripani,
B G Ritchie,
G Rosner,
P Rossi,
F Sabatié,
M S Saini,
J Salamanca,
C Salgado,
A Sandorfi,
J P Santoro,
V Sapunenko,
D Schott,
R A Schumacher,
V S Serov,
Y G Sharabian,
D Sharov,
N V Shvedunov,
E S Smith,
L C Smith,
D I Sober,
D Sokhan,
A Starostin,
A Stavinsky,
S Stepanyan,
S S Stepanyan,
B E Stokes,
P Stoler,
K A Stopani,
I I Strakovsky,
S Strauch,
M Taiuti,
D J Tedeschi,
A Teymurazyan,
A Tkabladze,
S Tkachenko,
L Todor,
C Tur,
M Ungaro,
M F Vineyard,
A V Vlassov,
D P Watts,
X Wei,
L B Weinstein,
D P Weygand,
M Williams,
E Wolin,
M H Wood,
A Yegneswaran,
M Yurov,
L Zana,
J Zhang,
B Zhao,
Z W Zhao
Istituto Nazionale di Fisica Nucleare, Sezione di Genova, 16146 Genova, Italy.
We report on the results of the first measurement of exclusive f_{0}(980) meson photoproduction on protons for E_{gamma}=3.0-3.8 GeV and -t=0.4-1.0 GeV2. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The resonance was detected via its decay in the pi;{+}pi;{-} channel by performing a partial wave analysis of the reaction gammap-->ppi;{+}pi;{-}. Clear evidence of the f_{0}(980) meson was found in the interference between P and S waves at M_{pi;{+}pi;{-}} approximately 1 GeV. The S-wave differential cross section integrated in the mass range of the f_{0}(980) was found to be a factor of about 50 smaller than the cross section for the rho meson. This is the first time the f_{0}(980) meson has been measured in a photoproduction experiment.
R Nasseripour,
M H Wood,
C Djalali,
D P Weygand,
C Tur,
U Mosel,
P Muehlich,
G Adams,
M J Amaryan,
P Ambrozewicz,
M Anghinolfi,
G Asryan,
H Avakian,
H Bagdasaryan,
N Baillie,
J P Ball,
N A Baltzell,
S Barrow,
M Battaglieri,
I Bedlinskiy,
M Bektasoglu,
M Bellis,
N Benmouna,
B L Berman,
A S Biselli,
L Blaszczyk,
S Bouchigny,
S Boiarinov,
R Bradford,
D Branford,
W J Briscoe,
W K Brooks,
S Bültmann,
V D Burkert,
C Butuceanu,
J R Calarco,
S L Careccia,
D S Carman,
B Carnahan,
L Casey,
S Chen,
P L Cole,
P Collins,
P Coltharp,
D Crabb,
H Crannell,
V Crede,
J P Cummings,
N Dashyan,
R De Masi,
R De Vita,
E De Sanctis,
P V Degtyarenko,
H Denizli,
L Dennis,
A Deur,
K V Dharmawardane,
R Dickson,
G E Dodge,
D Doughty,
M Dugger,
S Dytman,
O P Dzyubak,
H Egiyan,
K S Egiyan,
L El Fassi,
L Elouadrhiri,
P Eugenio,
G Fedotov,
G Feldman,
R J Feuerbach,
H Funsten,
M Garçon,
G Gavalian,
G P Gilfoyle,
K L Giovanetti,
F X Girod,
J T Goetz,
C I O Gordon,
R W Gothe,
K A Griffioen,
M Guidal,
N Guler,
L Guo,
V Gyurjyan,
C Hadjidakis,
K Hafidi,
H Hakobyan,
R S Hakobyan,
C Hanretty,
J Hardie,
F W Hersman,
K Hicks,
I Hleiqawi,
M Holtrop,
C E Hyde-Wright,
Y Ilieva,
D G Ireland,
B S Ishkhanov,
E L Isupov,
M M Ito,
D Jenkins,
H S Jo,
J R Johnstone,
K Joo,
H G Juengst,
N Kalantarians,
J D Kellie,
M Khandaker,
W Kim,
A Klein,
F J Klein,
A V Klimenko,
M Kossov,
Z Krahn,
L H Kramer,
V Kubarovsky,
J Kuhn,
S E Kuhn,
S V Kuleshov,
J Lachniet,
J M Laget,
J Langheinrich,
D Lawrence,
Ji Li,
K Livingston,
H Y Lu,
M Maccormick,
N Markov,
P Mattione,
S McAleer,
B McKinnon,
J W C McNabb,
B A Mecking,
S Mehrabyan,
J J Melone,
M D Mestayer,
C A Meyer,
T Mibe,
K Mikhailov,
R Minehart,
M Mirazita,
R Miskimen,
V Mokeev,
K Moriya,
S A Morrow,
M Moteabbed,
J Mueller,
E Munevar,
G S Mutchler,
P Nadel-Turonski,
S Niccolai,
G Niculescu,
I Niculescu,
B B Niczyporuk,
M R Niroula,
R A Niyazov,
M Nozar,
M Osipenko,
A I Ostrovidov,
K Park,
E Pasyuk,
C Paterson,
S Anefalos Pereira,
J Pierce,
N Pivnyuk,
D Pocanic,
O Pogorelko,
S Pozdniakov,
B M Preedom,
J W Price,
Y Prok,
D Protopopescu,
B A Raue,
G Riccardi,
G Ricco,
M Ripani,
B G Ritchie,
F Ronchetti,
G Rosner,
P Rossi,
F Sabatié,
J Salamanca,
C Salgado,
J P Santoro,
V Sapunenko,
R A Schumacher,
V S Serov,
Y G Sharabian,
D Sharov,
N V Shvedunov,
E S Smith,
L C Smith,
D I Sober,
D Sokhan,
A Stavinsky,
S S Stepanyan,
S Stepanyan,
B E Stokes,
P Stoler,
I I Strakovsky,
S Strauch,
M Taiuti,
D J Tedeschi,
A Tkabladze,
S Tkachenko,
L Todor,
M Ungaro,
M F Vineyard,
A V Vlassov,
D P Watts,
L B Weinstein,
M Williams,
E Wolin,
A Yegneswaran,
L Zana,
B Zhang,
J Zhang,
B Zhao,
Z W Zhao
University of South Carolina, Columbia, South Carolina 29208, USA.
The photoproduction of vector mesons on various nuclei has been studied using the CLAS detector at Jefferson Laboratory. The vector mesons, rho, omega, and varphi, are observed via their decay to e;{+}e;{-}, in order to reduce the effects of final-state interactions in the nucleus. Of particular interest are possible in-medium effects on the properties of the rho meson. The rho mass spectrum is extracted from the data on various nuclei, 2H, C, Fe, and Ti. We observe no significant mass shift and some broadening consistent with expected collisional broadening for the rho meson.
K S Egiyan,
G Asryan,
N Gevorgyan,
K A Griffioen,
J M Laget,
S E Kuhn,
G Adams,
M J Amaryan,
P Ambrozewicz,
M Anghinolfi,
G Audit,
H Avakian,
H Bagdasaryan,
N Baillie,
J P Ball,
N A Baltzell,
S Barrow,
V Batourine,
M Battaglieri,
I Bedlinskiy,
M Bektasoglu,
M Bellis,
N Benmouna,
B L Berman,
A S Biselli,
L Blaszczyk,
S Bouchigny,
S Boiarinov,
R Bradford,
D Branford,
W J Briscoe,
W K Brooks,
S Bültmann,
V D Burkert,
C Butuceanu,
J R Calarco,
S L Careccia,
D S Carman,
A Cazes,
S Chen,
P L Cole,
P Collins,
P Coltharp,
D Cords,
P Corvisiero,
D Crabb,
V Crede,
J P Cummings,
N Dashyan,
R De Masi,
R De Vita,
E De Sanctis,
P V Degtyarenko,
H Denizli,
L Dennis,
A Deur,
K V Dharmawardane,
R Dickson,
C Djalali,
G E Dodge,
J Donnelly,
D Doughty,
M Dugger,
S Dytman,
O P Dzyubak,
H Egiyan,
L El Fassi,
L Elouadrhiri,
P Eugenio,
R Fatemi,
G Fedotov,
G Feldman,
R J Feuerbach,
R Fersch,
M Garçon,
G Gavalian,
G P Gilfoyle,
K L Giovanetti,
F X Girod,
J T Goetz,
A Gonenc,
C I O Gordon,
R W Gothe,
M Guidal,
M Guillo,
N Guler,
L Guo,
V Gyurjyan,
C Hadjidakis,
K Hafidi,
H Hakobyan,
R S Hakobyan,
C Hanretty,
J Hardie,
F W Hersman,
K Hicks,
I Hleiqawi,
M Holtrop,
C E Hyde-Wright,
Y Ilieva,
D G Ireland,
B S Ishkhanov,
E L Isupov,
M M Ito,
D Jenkins,
H S Jo,
K Joo,
H G Juengst,
N Kalantarians,
J D Kellie,
M Khandaker,
W Kim,
A Klein,
F J Klein,
A V Klimenko,
M Kossov,
Z Krahn,
L H Kramer,
V Kubarovsky,
J Kuhn,
S V Kuleshov,
J Lachniet,
J Langheinrich,
D Lawrence,
Ji Li,
K Livingston,
H Y Lu,
M Maccormick,
C Marchand,
N Markov,
P Mattione,
S McAleer,
B McKinnon,
J W C McNabb,
B A Mecking,
S Mehrabyan,
J J Melone,
M D Mestayer,
C A Meyer,
T Mibe,
K Mikhailov,
R Minehart,
M Mirazita,
R Miskimen,
V Mokeev,
K Moriya,
S A Morrow,
M Moteabbed,
J Mueller,
E Munevar,
G S Mutchler,
P Nadel-Turonski,
R Nasseripour,
S Niccolai,
G Niculescu,
I Niculescu,
B B Niczyporuk,
M R Niroula,
R A Niyazov,
M Nozar,
G V O'rielly,
M Osipenko,
A I Ostrovidov,
K Park,
E Pasyuk,
C Paterson,
S Anefalos Pereira,
J Pierce,
N Pivnyuk,
D Pocanic,
O Pogorelko,
S Pozdniakov,
B M Preedom,
J W Price,
Y Prok,
D Protopopescu,
B A Raue,
G Riccardi,
G Ricco,
M Ripani,
B G Ritchie,
F Ronchetti,
G Rosner,
P Rossi,
F Sabatié,
J Salamanca,
C Salgado,
J P Santoro,
V Sapunenko,
R A Schumacher,
V S Serov,
Y G Sharabian,
N V Shvedunov,
A V Skabelin,
E S Smith,
L C Smith,
D I Sober,
D Sokhan,
A Stavinsky,
S S Stepanyan,
S Stepanyan,
B E Stokes,
P Stoler,
S Strauch,
M Taiuti,
D J Tedeschi,
U Thoma,
A Tkabladze,
S Tkachenko,
L Todor,
C Tur,
M Ungaro,
M F Vineyard,
A V Vlassov,
D P Watts,
L B Weinstein,
D P Weygand,
M Williams,
E Wolin,
M H Wood,
A Yegneswaran,
L Zana,
J Zhang,
B Zhao,
Z W Zhao
The reaction 2H(e,e;{'}p)n has been studied with full kinematic coverage for photon virtuality 1.75<Q2<5.5 GeV2. Comparisons of experimental data with theory indicate that for very low values of neutron recoil momentum (p_{n}<100 MeV/c) the neutron is primarily a spectator and the reaction can be described by the plane-wave impulse approximation. For 100<p_{n}<750 MeV/c, proton-neutron rescattering dominates the cross section, while Delta production followed by the NDelta-->NN transition is the primary contribution at higher momenta.
S Chen,
H Avakian,
V D Burkert,
P Eugenio,
G Adams,
M Amarian,
P Ambrozewicz,
M Anghinolfi,
G Asryan,
H Bagdasaryan,
N Baillie,
J P Ball,
N A Baltzell,
S Barrow,
V Batourine,
M Battaglieri,
K Beard,
I Bedlinskiy,
M Bektasoglu,
M Bellis,
N Benmouna,
B L Berman,
A S Biselli,
B E Bonner,
S Bouchigny,
S Boiarinov,
P Bosted,
R Bradford,
D Branford,
W J Briscoe,
W K Brooks,
S Bültmann,
C Butuceanu,
J R Calarco,
S L Careccia,
D S Carman,
B Carnahan,
A Cazes,
P L Cole,
P Collins,
P Coltharp,
D Cords,
P Corvisiero,
D Crabb,
H Crannell,
V Crede,
J P Cummings,
R De Masi,
R Devita,
E De Sanctis,
P V Degtyarenko,
H Denizli,
L Dennis,
A Deur,
K V Dharmawardane,
K S Dhuga,
C Djalali,
G E Dodge,
J Donnelly,
D Doughty,
M Dugger,
S Dytman,
O P Dzyubak,
H Egiyan,
K S Egiyan,
L El Fassi,
L Elouadrhiri,
R Fatemi,
G Fedotov,
G Feldman,
R J Feuerbach,
T A Forest,
H Funsten,
M Garçon,
G Gavalian,
G P Gilfoyle,
K L Giovanetti,
F X Girod,
J T Goetz,
E Golovatch,
A Gonenc,
R W Gothe,
K A Griffioen,
M Guidal,
M Guillo,
N Guler,
L Guo,
V Gyurjyan,
C Hadjidakis,
K Hafidi,
H Hakobyan,
R S Hakobyan,
J Hardie,
D Heddle,
F W Hersman,
K Hicks,
I Hleiqawi,
M Holtrop,
M Huertas,
C E Hyde-Wright,
Y Ilieva,
D G Ireland,
B S Ishkhanov,
E L Isupov,
M M Ito,
D Jenkins,
H S Jo,
K Joo,
H G Juengst,
C Keith,
J D Kellie,
M Khandaker,
K Y Kim,
K Kim,
W Kim,
A Klein,
F J Klein,
M Klusman,
M Kossov,
L H Kramer,
V Kubarovsky,
J Kuhn,
S E Kuhn,
S V Kuleshov,
J Lachniet,
J M Laget,
J Langheinrich,
D Lawrence,
Ji Li,
A C S Lima,
K Livingston,
H Lu,
K Lukashin,
M Maccormick,
N Markov,
S McAleer,
B McKinnon,
J W C McNabb,
B A Mecking,
M D Mestayer,
C A Meyer,
T Mibe,
K Mikhailov,
R Minehart,
M Mirazita,
R Miskimen,
V Mokeev,
L Morand,
S A Morrow,
M Moteabbed,
J Mueller,
G S Mutchler,
P Nadel-Turonski,
J Napolitano,
R Nasseripour,
N Natasha,
S Niccolai,
G Niculescu,
I Niculescu,
B B Niczyporuk,
M R Niroula,
R A Niyazov,
M Nozar,
G V O'rielly,
M Osipenko,
A I Ostrovidov,
K Park,
E Pasyuk,
C Paterson,
S A Philips,
J Pierce,
N Pivnyuk,
D Pocanic,
O Pogorelko,
E Polli,
I Popa,
S Pozdniakov,
B M Preedom,
J W Price,
Y Prok,
D Protopopescu,
L M Qin,
B A Raue,
G Riccardi,
G Ricco,
M Ripani,
B G Ritchie,
F Ronchetti,
G Rosner,
P Rossi,
D Rowntree,
P D Rubin,
F Sabatié,
C Salgado,
J P Santoro,
V Sapunenko,
R A Schumacher,
V S Serov,
Y G Sharabian,
J Shaw,
N V Shvedunov,
A V Skabelin,
E S Smith,
L C Smith,
D I Sober,
A Stavinsky,
S S Stepanyan,
S Stepanyan,
B E Stokes,
P Stoler,
I I Strakovsky,
S Strauch,
R Suleiman,
M Taiuti,
D J Tedeschi,
U Thoma,
A Tkabladze,
S Tkachenko,
L Todor,
C Tur,
M Ungaro,
M Vanderhaeghen,
M F Vineyard,
A V Vlassov,
D P Watts,
L B Weinstein,
D P Weygand,
M Williams,
E Wolin,
M H Wood,
A Yegneswaran,
J Yun,
L Zana,
J Zhang,
B Zhao,
Z Zhao
Florida State University, Tallahassee, Florida 32306, USA.
The longitudinal target-spin asymmetry A_{UL} for the exclusive electroproduction of high-energy photons was measured for the first time in ep[over -->]-->e;{'}pgamma. The data have been accumulated at JLab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH3 target. A significant azimuthal angular dependence was observed, resulting from the interference of the deeply virtual Compton scattering and Bethe-Heitler processes. The amplitude of the sinvarphi moment is 0.252+/-0.042;{stat}+/-0.020;{sys}. Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions H[over ] and H.
M Ungaro,
P Stoler,
I Aznauryan,
V D Burkert,
K Joo,
L C Smith,
G Adams,
M Amarian,
P Ambrozewicz,
M Anghinolfi,
G Asryan,
G Audit,
H Avakian,
H Bagdasaryan,
J P Ball,
N A Baltzell,
S Barrow,
V Batourine,
M Battaglieri,
I Bedliski,
M Bektasoglu,
M Bellis,
N Benmouna,
B L Berman,
A S Biselli,
B E Bonner,
S Bouchigny,
S Boiarinov,
R Bradford,
D Branford,
W J Briscoe,
W K Brooks,
S Bültmann,
C Butuceanu,
J R Calarco,
S L Careccia,
D S Carman,
A Cazes,
S Chen,
P L Cole,
P Coltharp,
D Cords,
P Corvisiero,
D Crabb,
J P Cummings,
E De Sanctis,
R Devita,
P V Degtyarenko,
H Denizli,
L Dennis,
A Deur,
K V Dharmawardane,
C Djalali,
G E Dodge,
J Donnelly,
D Doughty,
M Dugger,
S Dytman,
O P Dzyubak,
H Egiyan,
K S Egiyan,
L Elouadrhiri,
P Eugenio,
R Fatemi,
G Fedotov,
G Feldman,
R J Feuerbach,
H Funsten,
M Garçon,
G Gavalian,
G P Gilfoyle,
K L Giovanetti,
F X Girod,
J Goetz,
C I O Gordon,
R W Gothe,
K A Griffioen,
M Guidal,
M Guillo,
N Guler,
L Guo,
V Gyurjyan,
C Hadjidakis,
R S Hakobyan,
J Hardie,
D Heddle,
F W Hersman,
I Hleiqawi,
M Holtrop,
K Hicks,
C E Hyde-Wright,
Y Ilieva,
D G Ireland,
B S Ishkhanov,
M M Ito,
D Jenkins,
H S Jo,
H G Juengst,
J D Kellie,
M Khandaker,
W Kim,
A Klein,
F J Klein,
A V Klimenko,
M Kossov,
L H Kramer,
V Kubarovsky,
J Kuhn,
S E Kuhn,
J Lachniet,
J M Laget,
J Langheinrich,
D Lawrence,
T Lee,
Ji Li,
K Livingston,
C Marchand,
N Markov,
S McAleer,
B McKinnon,
J W C McNabb,
B A Mecking,
S Mehrabyan,
J J Melone,
M D Mestayer,
C A Meyer,
K Mikhailov,
R Minehart,
M Mirazita,
R Miskimen,
V Mokeev,
L Morand,
S A Morrow,
J Mueller,
G S Mutchler,
J Napolitano,
R Nasseripour,
S Niccolai,
G Niculescu,
I Niculescu,
B B Niczyporuk,
M Niroula,
R A Niyazov,
M Nozar,
G V O'rielly,
M Osipenko,
A I Ostrovidov,
K Park,
E Pasyuk,
S A Philips,
N Pivnyuk,
D Pocanic,
O Pogorelko,
E Polli,
S Pozdniakov,
B M Preedom,
J W Price,
Y Prok,
D Protopopescu,
L M Qin,
B A Raue,
G Riccardi,
G Ricco,
M Ripani,
B G Ritchie,
F Ronchetti,
G Rosner,
P Rossi,
P D Rubin,
F Sabatié,
C Salgado,
J P Santoro,
V Sapunenko,
R A Schumacher,
V S Serov,
Y G Sharabian,
A V Skabelin,
E S Smith,
D I Sober,
A Stavinsky,
S S Stepanyan,
S Stepanyan,
B E Stokes,
I I Strakovsky,
S Strauch,
M Taiuti,
D J Tedeschi,
U Thoma,
A Tkabladze,
L Todor,
S Tkachenko,
C Tur,
M F Vineyard,
A V Vlassov,
L B Weinstein,
D P Weygand,
M Williams,
E Wolin,
M H Wood,
A Yegneswaran,
L Zana,
B Zhang,
J Zhang,
B Zhao
Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA and University of Connecticut, Storrs, Connecticut 06269, USA and Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
We report a new measurement of the exclusive electroproduction reaction gamma;{*}p-->pi;{0}p to explore the evolution from soft nonperturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the N-->Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c;{2}, 4pi center-of-mass solid angle, and Q2 from 3 to 6 GeV;{2}/c;{2}, the highest yet achieved. It is found that the magnetic form factor G_{M};{*} decreases with Q2 more steeply than the proton magnetic form factor, the ratio E_{1+}/M_{1+} is small and negative, indicating strong helicity nonconservation, and the ratio S_{1+}/M_{1+} is negative, while its magnitude increases with Q2.
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