Inclusive cross section and double helicity asymmetry for \pi^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton - IN2P3 - Institut national de physique nucléaire et de physique des particules
Journal Articles Physical Review D Year : 2007

Inclusive cross section and double helicity asymmetry for \pi^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton

A. Adare , S. Afanasiev , C. Aidala , N.N. Ajitanand , Y. Akiba , H. Al-Bataineh , J. Alexander , K. Aoki , Laurent Aphecetche (1) , 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 , A. Bazilevsky , S. Belikov , R. Bennett , Y. Berdnikov , A.A. Bickley , J.G. Boissevain , H. Borel , K. Boyle , M.L. Brooks , H. Buesching , V. Bumazhnov , G. Bunce , S. Butsyk , S. Campbell , 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 , B.A. Cole , M.P. Comets (2) , P. Constantin , M. Csanad , T. Csörgö , T. Dahms , K. Das , G. David , M.B. Deaton , K. Dehmelt , H. Delagrange (1) , A. Denisov , D. d'Enterria , A. Deshpande , E.J. Desmond , O. Dietzsch , A. Dion , M. Donadelli , 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 , S. Esumi , K.O. Eyser , 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 , S. Gadrat (3) , 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 (1) , 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 , T. Ichihara , K. Imai , 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 (2) , F. Kajihara , S. Kametani , N. Kamihara , J. Kamin , M. Kaneta , J.H. Kang , H. Kanou , D. Kawall , A.V. Kazantsev , A. Khanzadeev , J. Kikuchi , D.H. Kim , D.J. Kim , E. 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. Kral , A. Kravitz , 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. A. Lebedev , D.M. Lee , M.K. Lee , T. Lee , M.J. Leitch , M.A.L. Leite , B. Lenzi , T. Liska , A. Litvinenko , M.X. Liu , X. 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. Mccumber , P.L. Mcgaughey , Y. Miake , P. Mikes , K. Miki , T.E. Miller , A. Milov , S. Mioduszewski , M. Mishra , J.T. Mitchell , M. Mitrovski , A. Morreale , D.P. Morrison , 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 , E. O'Brien , S.X. Oda , C.A. Ogilvie , H. Ohnishi , H. Okada , K. Okada , M. Oka , O.O. Omiwade , 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 , G. Roche (3) , A. Romana , M. Rosati , S.S.E. Rosendahl , P. Rosnet (3) , P. Rukoyatkin , V.L. Rykov , B. Sahlmueller , N. Saito , T. Sakaguchi , S. Sakai , H. Sakata , V. Samsonov , S. Sato , S. Sawada , J. Seele , R. Seidl , V. Semenov , R. Seto , D. Sharma , I. Shein , A. Shevel , T.-A. Shibata , K. Shigaki , M. Shimomura , K. Shoji , A. Sickles , C.L. Silva , D. Silvermyr , C. Silvestre , K.S. Sim , 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 (2) , J. Sziklai , T. Tabaru , S. Takagi , E.M. Takagui , A. Taketani , Y. Tanaka , K. Tanida , M.J. Tannenbaum , A. Taranenko , P. Tarjan , T.L. Thomas , M. Togawa , A. Toia , J. Tojo , L. Tomasek , H. Torii , R.S. Towell , V.-N. Tram , I. Tserruya , Y. Tsuchimoto , 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 , D. Winter , C.L. Woody , M. Wysocki , W. Xie , Y. 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. Zimanyi , L. Zolin
A. Adare
  • Function : Author
S. Afanasiev
  • Function : Author
C. Aidala
  • Function : Author
N.N. Ajitanand
  • Function : Author
Y. Akiba
  • Function : Author
H. Al-Bataineh
  • Function : Author
J. Alexander
  • Function : Author
K. Aoki
  • Function : Author
Laurent Aphecetche
R. Armendariz
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S.H. Aronson
  • Function : Author
J. Asai
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E. T. Atomssa
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R. Averbeck
  • Function : Author
T.C. Awes
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B. Azmoun
  • Function : Author
V. Babintsev
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G. Baksay
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L. Baksay
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A. Baldisseri
  • Function : Author
K.N. Barish
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P.D. Barnes
  • Function : Author
B. Bassalleck
  • Function : Author
S. Bathe
  • Function : Author
S. Batsouli
  • Function : Author
V. Baublis
  • Function : Author
A. Bazilevsky
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S. Belikov
  • Function : Author
R. Bennett
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Y. Berdnikov
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A.A. Bickley
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J.G. Boissevain
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H. Borel
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K. Boyle
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M.L. Brooks
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H. Buesching
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V. Bumazhnov
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G. Bunce
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S. Butsyk
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S. Campbell
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B.S. Chang
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J.-L. Charvet
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S. Chernichenko
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J. Chiba
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C.Y. Chi
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M. Chiu
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I.J. Choi
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T. Chujo
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P. Chung
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A. Churyn
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V. Cianciolo
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C.R. Cleven
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B.A. Cole
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P. Constantin
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M. Csanad
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T. Csörgö
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T. Dahms
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K. Das
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G. David
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M.B. Deaton
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K. Dehmelt
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A. Denisov
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D. d'Enterria
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A. Deshpande
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E.J. Desmond
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O. Dietzsch
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A. Dion
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M. Donadelli
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O. Drapier
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A. Drees
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A.K. Dubey
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A. Durum
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V. Dzhordzhadze
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Y.V. Efremenko
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J. Egdemir
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F. Ellinghaus
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W.S. Emam
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A. Enokizono
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H. En'Yo
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S. Esumi
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K.O. Eyser
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D.E. Fields
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M. Finger
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M. Finger Jr.
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F. Fleuret
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S.L. Fokin
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Z. Fraenkel
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J.E. Frantz
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A. Franz
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A.D. Frawley
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K. Fujiwara
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Y. Fukao
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T. Fusayasu
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I. Garishvili
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A. Glenn
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H. Gong
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M. Gonin
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J. Gosset
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Y. Goto
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R. Granier de Cassagnac
N. Grau
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S.V. Greene
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M. Grosse Perdekamp
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T. Gunji
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H.-A. Gustafsson
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T. Hachiya
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C. Haegemann
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J.S. Haggerty
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H. Hamagaki
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R. Han
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H. Harada
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E.P. Hartouni
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K. Haruna
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E. Haslum
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R. Hayano
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M. Heffner
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T.K. Hemmick
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T. Hester
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X. He
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H. Hiejima
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J.C. Hill
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R. Hobbs
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M. Hohlmann
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W. Holzmann
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K. Homma
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B. Hong
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T. Horaguchi
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D. Hornback
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T. Ichihara
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K. Imai
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M. Inaba
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Y. Inoue
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D. Isenhower
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L. Isenhower
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M. Ishihara
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T. Isobe
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M. Issah
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A. Isupov
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B.V. Jacak
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J. Jia
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J. Jin
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O. Jinnouchi
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B.M. Johnson
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K.S. Joo
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F. Kajihara
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S. Kametani
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N. Kamihara
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J. Kamin
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M. Kaneta
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J.H. Kang
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H. Kanou
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D. Kawall
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A.V. Kazantsev
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A. Khanzadeev
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J. Kikuchi
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D.H. Kim
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D.J. Kim
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E. Kim
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E. Kinney
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A. Kiss
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E. Kistenev
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A. Kiyomichi
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J. Klay
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C. Klein-Boesing
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L. Kochenda
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V. Kochetkov
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B. Komkov
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M. Konno
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D. Kotchetkov
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A. Kozlov
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A. Kral
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A. Kravitz
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J. Kubart
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G.J. Kunde
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N. Kurihara
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K. Kurita
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M.J. Kweon
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Y. Kwon
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G.S. Kyle
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R. Lacey
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Y.-S. Lai
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J.G. Lajoie
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A. A. Lebedev
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D.M. Lee
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M.K. Lee
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T. Lee
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M.J. Leitch
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M.A.L. Leite
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B. Lenzi
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T. Liska
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A. Litvinenko
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M.X. Liu
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X. Li
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B. Love
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D. Lynch
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C.F. Maguire
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Y.I. Makdisi
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A. Malakhov
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M.D. Malik
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V.I. Manko
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Y. Mao
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L. Masek
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H. Masui
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F. Matathias
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M. Mccumber
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P.L. Mcgaughey
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Y. Miake
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P. Mikes
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K. Miki
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T.E. Miller
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A. Milov
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S. Mioduszewski
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M. Mishra
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J.T. Mitchell
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M. Mitrovski
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A. Morreale
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D.P. Morrison
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T.V. Moukhanova
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D. Mukhopadhyay
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J. Murata
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S. Nagamiya
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Y. Nagata
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J.L. Nagle
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M. Naglis
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I. Nakagawa
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Y. Nakamiya
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T. Nakamura
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K. Nakano
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J. Newby
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M. Nguyen
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B.E. Norman
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A.S. Nyanin
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E. O'Brien
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S.X. Oda
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C.A. Ogilvie
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H. Ohnishi
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H. Okada
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K. Okada
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M. Oka
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O.O. Omiwade
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A. Oskarsson
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M. Ouchida
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K. Ozawa
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R. Pak
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D. Pal
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A.P.T. Palounek
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V. Pantuev
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V. Papavassiliou
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J. Park
W.J. Park
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S.F. Pate
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H. Pei
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J.-C. Peng
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H. Pereira
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V. Peresedov
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D.Yu. Peressounko
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C. Pinkenburg
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M.L. Purschke
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A.K. Purwar
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H. Qu
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J. Rak
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A. Rakotozafindrabe
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I. Ravinovich
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K.F. Read
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S. Rembeczki
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M. Reuter
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K. Reygers
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V. Riabov
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Y. Riabov
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A. Romana
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M. Rosati
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S.S.E. Rosendahl
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P. Rukoyatkin
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V.L. Rykov
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B. Sahlmueller
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N. Saito
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T. Sakaguchi
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S. Sakai
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H. Sakata
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V. Samsonov
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S. Sato
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S. Sawada
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J. Seele
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R. Seidl
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V. Semenov
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R. Seto
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D. Sharma
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I. Shein
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A. Shevel
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T.-A. Shibata
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K. Shigaki
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M. Shimomura
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K. Shoji
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A. Sickles
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C.L. Silva
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D. Silvermyr
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C. Silvestre
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K.S. Sim
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C.P. Singh
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V. Singh
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S. Skutnik
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M. Slunecka
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A. Soldatov
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R.A. Soltz
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W.E. Sondheim
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S.P. Sorensen
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I.V. Sourikova
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F. Staley
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P.W. Stankus
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E. Stenlund
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M. Stepanov
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A. Ster
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S.P. Stoll
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T. Sugitate
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J. Sziklai
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T. Tabaru
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S. Takagi
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E.M. Takagui
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A. Taketani
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Y. Tanaka
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K. Tanida
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M.J. Tannenbaum
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A. Taranenko
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P. Tarjan
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T.L. Thomas
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M. Togawa
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A. Toia
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J. Tojo
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L. Tomasek
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H. Torii
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R.S. Towell
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V.-N. Tram
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I. Tserruya
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Y. Tsuchimoto
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C. Vale
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H. Valle
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H.W. van Hecke
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J. Velkovska
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R. Vertesi
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A.A. Vinogradov
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M. Virius
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V. Vrba
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E. Vznuzdaev
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M. Wagner
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D. Walker
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X.R. Wang
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Y. Watanabe
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J. Wessels
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S.N. White
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D. Winter
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C.L. Woody
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M. Wysocki
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W. Xie
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Y. Yamaguchi
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A. Yanovich
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Z. Yasin
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J. Ying
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S. Yokkaichi
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G.R. Young
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I. Younus
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I.E. Yushmanov
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W.A. Zajc
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O. Zaudtke
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C. Zhang
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S. Zhou
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J. Zimanyi
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L. Zolin
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Abstract

The PHENIX experiment presents results from the RHIC 2005 run with polarized proton collisions at sqrt(s)=200 GeV, for inclusive \pi^0 production at mid-rapidity. Unpolarized cross section results are given for transverse momenta p_T=0.5 to 20 GeV/c, extending the range of published data to both lower and higher p_T. The cross section is described well for p_T < 1 GeV/c by an exponential in p_T, and, for p_T > 2 GeV/c, by perturbative QCD. Double helicity asymmetries A_LL are presented based on a factor of five improvement in uncertainties as compared to previously published results, due to both an improved beam polarization of 50%, and to higher integrated luminosity. These measurements are sensitive to the gluon polarization in the proton, and exclude maximal values for the gluon polarization.

Dates and versions

in2p3-00164552 , version 1 (20-07-2007)

Identifiers

Cite

A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Inclusive cross section and double helicity asymmetry for \pi^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton. Physical Review D, 2007, 76, pp.051106. ⟨10.1103/PhysRevD.76.051106⟩. ⟨in2p3-00164552⟩
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