Inclusive cross sections, charge ratio and double-helicity asymmetries for $\pi^+$ and $\pi^-$ production in $p$$+$$p$ collisions at $\sqrt{s}$=200 GeV

A. M. Adare,C. Aidala,N. N. Ajitanand,Y. Akiba,R. Akimoto,H. Al-Ta'ani,J P Alexander,K. R. Andrews,Aaron Angerami,K. Aoki,Nicole Apadula,Eric Appelt,Y. Aramaki,R. Armendariz,E C Aschenauer,E. T. Atomssa,T. C. Awes,B. Azmoun,V. Babintsev,M Bai,B. Bannier,K N Barish,B. Bassalleck,Austin Basye,S. Bathe,V. Baublis,C. Baumann,A. Bazilevsky,Ronald John Belmont Iii,J. Ben-Benjamin,R. Bennett,Dmitry Blau,J. S. Bok,K. Boyle,M.L. Brooks,D. Broxmeyer,Henner Buesching,V. Bumazhnov,G Bunce,S. Butsyk,S. Campbell,P. Castera,C-H. Chen,C. Y. Chi,M. Chiu,I.J. Choi,J. B. Choi,R. K. Choudhury,Peter Christiansen,Tatsuya Chujo,O. Chvala,V. Cianciolo,Zvi Hirsh Citron,B. A. Cole,Z. Conesa-Del-Valle,Megan Elizabeth Connors,Máté Csanád,T. Csörgő,S. Dairaku,Alakabha Datta,G. David,M. K. Dayananda,A. Denisov,A Deshpande,E J Desmond,K.V. Dharmawardane,O. Dietzsch,A Dion,Marisílvia Donadelli,O. Drapier,A. Drees,K.A.Drees,J.M. Durham,A. Durum,L. D'Orazio,Y. V. Efremenko,T. Engelmore,A. Enokizono,H. En'yo,S.Esumi,B Fadem,D E Fields,M. Finger,F. Fleuret,Sergey Fokin,J. E. Frantz,A Franz,A.D. Frawley,Y. Fukao,Takahiro Fusayasu,C. Gal,Irakli Garishvili,F Giordano,A Glenn,X Gong,M. Gonin,Y. Goto,R. Granier de Cassagnac,N. Grau,S.V. Greene,M. Grosse Perdekamp,Taku Gunji,Lei Guo,H.-Å. Gustafsson,J.S. Haggerty,K. I. Hahn,H. Hamagaki,J. Hamblen,R Han,J. Hanks,C. Harper,K. Hashimoto,Eva Haslum,R. S. Hayano,Xi He,T.K. Hemmick,T. Hester,J. C. Hill,R. S. Hollis,W. Holzmann,K. Homma,B. Hong,T Horaguchi,Yasuto Hori,D. Hornback,S Huang,T. Ichihara,R. Ichimiya,H. Iinuma,Y. Ikeda,K. Imai,Motoi Inaba,A. Iordanova,D. Isenhower,M. Ishihara,M. Issah,D. Ivanischev,Y. Iwanaga,B. V. Jacak,J. Jia,X. Jiang,D John,B. M. Johnson,T. W. Jones,K. S. Joo,D. Jouan,J. Kamin,Steven Kaneti,B. H. Kang,J. H. Kang,J. S. Kang,J.S. 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. K. Kim,Youngsang Kim,E.R. Kinney,A Kiss,E Kistenev,D. Kleinjan,P. Kline,L. Kochenda,B. Komkov,M. Konno,J. Koster,D. Kotov,A. Kral,G. J. Kunde,K. Kurita,M. Kurosawa,Y. J. Kwon,G.S. Kyle,R Lacey,Y.-S. Lai,J. G. Lajoie,A. Lebedev,Donghwa Lee,Jason Sang Hun Lee,K.-B. Lee,K.S. Lee,Shih-Chang Lee,S. R. Lee,M. J. Leitch,M. A. L. Leite,Xinlin Li,S. H. Lim,L. A. Linden Levy,H. Liu,M. X. Liu,B. Love,D. Lynch,C. F. Maguire,Y.I. Makdisi,A. Manion,Vladislav Manko,E. Mannel,Y. J. Mao,H Masui,M Mccumber,P. L. McGaughey,Don McGlinchey,C. McKinney,N. Means,M. Mendoza,B. Meredith,Yasuo Miake,T. Mibe,A.C. Mignerey,Kenjiro 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,Ke. Nakamura,T. Nakamura,K. Nakano,J Newby,M. Nguyen,M. Nihashi,R. Nouicer,A. S. Nyanin,C Oakley,E OBrien,C.A. Ogilvie,Makoto Oka,K. Okada,Anders Nils Erik Oskarsson,M. Ouchida,K. Ozawa,R. Pak,V.S. Pantuev,V. Papavassiliou,Byoungchoo Park,Il Han Park,S K Park,S. F. Pate,L. Patel,Hua Pei,J.C. Peng,H. Pereira,D Yu Peressounko,R. Petti,C Pinkenburg,R. P. Pisani,Manuel Proissl,M.L. Purschke,H Qu,Jan Rak,Ilia Ravinovich,K.F. Read,Klaus Johannes Reygers,Viktor Riabov,Y. Riabov,Emily D. Richardson,D Roach,G. Roche,S. D. Rolnick,M. Rosati,S. S. E. Rosendahl,J. G. Rubin,B. Sahlmueller,N. Saito,T. Sakaguchi,Vladimir 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,Maya Shimomura,K. Shoji,P. Shukla,A.M. Sickles,C. L Silva,David Olle Rickard Silvermyr,Catherine Micaela Silvestre,K.S. Sim,Brajesh K. Singh,C. P. Singh,V. Singh,M. Slunecka,T. Sodré,R.A. Soltz,W. E. Sondheim,S. P. Sorensen,I. V. Sourikova,P.W. Stankus,Evert Anders Stenlund,S. P. Stoll,T. Sugitate,A. Sukhanov,J. Sun,J. Sziklai,E.M. Takagui,Atsushi Takahara,A. Taketani,R. Tanabe,Y. Tanaka,S. Taneja,K Tanida,M.J. Tannenbaum,S. Tarafdar,A. Taranenko,E. Tennant,H. Themann,Daniel Thomas,M. Togawa,L. Tomasek,M. Tomasek,H A Torii,R. S. Towell,I. Tserruya,Y Tsuchimoto,K. Utsunomiya,C. Vale,H. W. van Hecke,E. Vazquez-Zambrano,A. Veicht,J. Velkovska,Robert Vertesi,M. Virius,A. Vossen,V Vrba,E. Vznuzdaev,X.R. Wang,D. Watanabe,K Watanabe,Y. Watanabe,Yu. Watanabe,F. Wei,R. Wei,J.P. 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,Zhiying You,G. R. Young,I. Younus,I. E. Yushmanov,W. A. Zajc,A.N. Zelenski,S. Zhou

Inclusive cross sections, charge ratio and double-helicity asymmetries for $\pi^+$ and $\pi^-$ production in $p$$+$$p$ collisions at $\sqrt{s}$=200 GeV

2014

We present the midrapidity charged pion invariant cross sections and the ratio of $\pi^-$-to-$\pi^+$ production ($5quantum chromodynamics within large uncertainties in the calculation due to the choice of factorization, renormalization, and fragmentation scales. However, the theoretical calculation of the ratio of $\pi^-$-to-$\pi^+$ production when considering these scale uncertainties overestimates the measured value, suggesting further investigation of the uncertainties on the charge-separated pion fragmentation functions is needed. Due to cancellations of uncertainties in the charge ratio, direct inclusion of these ratio data in future parameterizations should improve constraints on the flavor dependence of quark fragmentation functions to pions. By measuring charge-separated pion asymmetries, one can gain sensitivity to the sign of $\Delta G$ through the opposite sign of the up and down quark helicity distributions in conjunction with preferential fragmentation of positive pions from up quarks and negative pions from down quarks. The double-helicity asymmetries presented are sensitive to the gluon helicity distribution over an $x$ range of $\sim$0.03--0.16.

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