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Improved Measurement of Double Helicity Asymmetry in Inclusive Midrapidity $\pi^0$ Production for Polarized p+p Collisions at $\sqrt S$=200 GeV

S.S. Adler S. Afanasiev C. Aidala N.N. Ajitanand Y. Akiba A. Al-Jamel J. Alexander K. Aoki Laurent Aphecetche 1 R. Armendariz S.H. Aronson R. Averbeck T.C. Awes B. Azmoun V. Babintsev 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 M.T. Bjorndal J.G. Boissevain H. Borel K. Boyle M.L. Brooks D.S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J.M. Burward-Hoy S. Butsyk X. Camard 1 S. Campbell J.-S. Chai P. Chand W.C. Chang S. Chernichenko C.Y. Chi J. Chiba M. Chiu I.J. Choi R.K. Choudhury T. Chujo V. Cianciolo C.R. Cleven Y. Cobigo B.A. Cole M.P. Comets 2 P. Constantin M. Csanàd T. Csörgö Jean-Pierre Cussonneau 1 D. d'Enterria T. Dahms K. Das G. David F. Deak H. Delagrange 1 A. Denisov A. Deshpande E.J. Desmond A. Devismes O. Dietzsch A. Dion J.L. Drachenberg O. Drapier 3 A. Drees A.K. Dubey A. Durum D. Dutta V. Dzhordzhadze Y.V. Efremenko J. Egdemir A. Enokizono H. Enyo B. Espagnon 2 S. Esumi D.E. Fields C. Finck 1 F. Fleuret 3 S.L. Fokin B. Forestier 4 B.D. Fox Z. Fraenkel J.E. Frantz A. Franz A.D. Frawley Y. Fukao S.-Y. Fung S. Gadrat 4 F. Gastineau 1 Marie Germain 1 A. Glenn M. Gonin 3 J. Gosset Y. Goto R. Granier de Cassagnac 3 N. Grau S.V. Greene M. Grosse Perdekamp T. Gunji H.-A. Gustafsson T. Hachiya A. Hadj Henni 1 J.S. Haggerty M.N. Hagiwara H. Hamagaki A.G. Hansen H. Harada E.P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko R. Hayano X. He M. Heffner T.K. Hemmick J.M. Heuser P. Hidas H. Hiejima J.C. Hill R. Hobbs M. Holmes W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi M.G. Hur T. Ichihara V.V. Ikonnikov K. Imai M. Inaba M. Inuzuka D. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B.V. Jacak J. Jia J. Jin O. Jinnouchi B.M. Johnson S.C. Johnson K.S. Joo D. Jouan 2 F. Kajihara S. Kametani N. Kamihara M. Kaneta J.H. Kang K. Katou T. Kawabata T. Kawagishi A.V. Kazantsev Steven Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D.J. Kim E. Kim G.-B. Kim 3 H.J. Kim Y.-S. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov R. Kohara B. Komkov M. Konno D. Kotchetkov A. Kozlov P.J. Kroon C.H. Kuberg N. Kurihara K. Kurita M.J. Kweon Y. Kwon G.S. Kyle G.J. Kunde R. Lacey J.G. Lajoie Y. Le Bornec 2 A. Lebedev S. Leckey D.M. Lee M.K. Lee M.J. Leitch M.A.L. Leite X.H. Li H. Lim A. Litvinenko M.X. Liu C.F. Maguire Y.I. Makdisi A. Malakhov M.D. Malik V.I. Manko Y. Mao Gines Martinez Garcia 1 H. Masui F. Matathias T. Matsumoto M.C. Mccain P.L. Mcgaughey Y. Miake T.E. Miller A. Milov S. Mioduszewski G.C. Mishra J.T. Mitchell A.K. Mohanty D.P. Morrison J.M. Moss T.V. Moukhanova D. Mukhopadhyay M. Muniruzzaman J. Murata S. Nagamiya Y. Nagata J.L. Nagle M. Naglis T. Nakamura J. Newby M. Nguyen B.E. Norman A.S. Nyanin J. Nystrand E. O'Brien C.A. Ogilvie H. Ohnishi I.D. Ojha H. Okada K. Okada O.O. Omiwade A. Oskarsson I. Otterlund K. Oyama K. Ozawa D. Pal A.P.T. Palounek V. Pantuev V. Papavassiliou J. Park W.J. Park S.F. Pate H. Pei V. Penev J.-C. Peng H. Pereira V. Peresedov D.Yu. Peressounko A. Pierson C. Pinkenburg R.P. Pisani M.L. Purschke A.K. Purwar H. Qu J.M. Qualls J. Rak I. Ravinovich K.F. Read M. Reuter K. Reygers V. Riabov Y. Riabov G. Roche 4 A. Romana 3 M. Rosati S.S.E. Rosendahl P. Rosnet 4 P. Rukoyatkin V.L. Rykov S.S. Ryu B. Sahlmueller N. Saito T. Sakaguchi S. Sakai V. Samsonov L. Sanfratello R. Santo H.D. Sato S. Sato S. Sawada Y. Schutz 1 V. Semenov R. Seto D. Sharma T.K. Shea I. Shein T.-A. Shibata K. Shigaki M. Shimomura T. Shohjoh K. Shoji A. Sickles C.L. Silva D. Silvermyr K.S. Sim C.P. Singh V. Singh S. Skutnik 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 2 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. Tarjan T.L. Thomas M. Togawa J. Tojo H. Torii R.S. Towell V.-N. Tram 3 I. Tserruya Y. Tsuchimoto S.K. Tuli H. Tydesjö N. Tyurin T.J. Uam H. Valle H.W. van Hecke J. Velkovska M. Velkovsky R. Vertesi V. Veszprémi A.A. Vinogradov M.A. Volkov E. Vznuzdaev M. Wagner X.R. Wang Y. Watanabe J. Wessels S.N. White N. Willis 2 D. Winter F.K. Wohn C.L. Woody M. Wysocki W. Xie A. Yanovich S. Yokkaichi G.R. Young I. Younus I.E. Yushmanov W.A. Zajc O. Zaudtke C. Zhang S. Zhou J. Zimanyi L. Zolin X. Zong
Abstract : We present an improved measurement of the double helicity asymmetry for $\pi^0$ production in polarized proton-proton scattering at $\sqrt S$= 200 GeV employing the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The improvements to our previous measurement come from two main factors: Inclusion of a new data set from the 2004 RHIC run with higher beam polarizations than the earlier run and a recalibration of the beam polarization measurements, which resulted in reduced uncertainties and increased beam polarizations. The results are compared to a Next to Leading Order (NLO) perturbative Quantum Chromodynamics (pQCD) calculation with a range of polarized gluon distributions.
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Submitted on : Tuesday, February 7, 2006 - 4:41:05 PM
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S.S. Adler, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Improved Measurement of Double Helicity Asymmetry in Inclusive Midrapidity $\pi^0$ Production for Polarized p+p Collisions at $\sqrt S$=200 GeV. Physical Review D, American Physical Society, 2006, 73, pp.091102. ⟨10.1103/PhysRevD.73.091102⟩. ⟨in2p3-00025579⟩

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