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Inclusive cross section and double helicity asymmetry for pi^0 production in p+p collisions at sqrt(s) = 62.4 GeV

A. Adare S. Afanasiev C. Aidala N.N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki Laurent Aphecetche 1 J. Asai E. T. Atomssa 2 R. Averbeck T.C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri 3 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 3 K. Boyle M.L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. Muñoz Camacho S. Campbell P. Chand B.S. Chang W.C. Chang J.-L. Charvet 3 S. Chernichenko C.Y. Chi M. Chiu I.J. Choi R.K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo B.A. Cole P. Constantin M. Csan'Ad T. Cs¨org˝o T. Dahms S. Dairaku K. Das G. David A. Denisov D. d'Enterria 2 A. Deshpande E.J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier 2 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 F. Fleuret 2 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 2 J. Gosset 3 Y. Goto R. Granier de Cassagnac 2 N. Grau S.V. Greene M. Grosse Perdekamp T. Gunji H.-°a. Gustafsson A. Hadj Henni 1 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 4 F. Kajihara S. Kametani N. Kamihara J. Kamin J.H. Kang J. Kapustinsky D. Kawall A.V. Kazantsev T. Kempel A. Khanzadeev K. 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. Kr'Al 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. Liˇska A. Litvinenko Hong 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. Maˇsek H. Masui F. Matathias M. Mccumber P.L. Mcgaughey B. Meredith Y. Miake P. Mikeˇs 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. 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 3 V. Peresedov D.Yu. Peressounko C. Pinkenburg M.L. Purschke A.K. Purwar H. Qu J. Rak A. Rakotozafindrabe 2 I. Ravinovich K.F. Read S. Rembeczki M. Reuter K. Reygers V. Riabov Y. Riabov D. Roach G. Roche 5 S.D. Rolnick M. Rosati S.S.E. Rosendahl P. Rosnet 5 P. Rukoyatkin P. Ruˇziˇcka 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 3 K.S. Sim B.K. Singh C.P. Singh V. Singh M. Sluneˇcka A. Soldatov R.A. Soltz W.E. Sondheim S.P. Sorensen I.V. Sourikova F. Staley 3 P.W. Stankus E. Stenlund M. Stepanov A. Ster S.P. Stoll T. Sugitate C. Suire 4 A. Sukhanov J. Sziklai E.M. Takagui A. Taketani R. Tanabe Y. Tanaka S. Taneja K. Tanida M.J. Tannenbaum A. Taranenko P. Tarj'An T.L. Thomas M. Togawa A. Toia L. Tom'Aˇsek Y. Tomita H. Torii R.S. Towell V.-N. Tram 2 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
Abstract : The PHENIX experiment presents results from the RHIC 2006 run with polarized proton collisions at sqrt(s) = 62.4 GeV for inclusive pi^0 production at mid-rapidity. Unpolarized cross section results are measured for transverse momenta p_T = 0.5 to 7 GeV/c. Next-to-leading order perturbative quantum chromodynamics calculations are compared with the data, and while the calculations are consistent with the measurements, next-to-leading logarithmic corrections improve the agreement. Double helicity asymmetries A_LL are presented for p_T = 1 to 4 GeV/c and probe the higher range of Bjorken_x of the gluon (x_g) with better statistical precision than our previous measurements at sqrt(s)=200 GeV. These measurements are sensitive to the gluon polarization in the proton for 0.06 < x_g < 0.4.
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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) = 62.4 GeV. Physical Review D, American Physical Society, 2009, 79, pp.012003. ⟨10.1103/PhysRevD.79.012003⟩. ⟨in2p3-00338444⟩

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