# Inclusive cross section and double-helicity asymmetry for pi(0) production at midrapidity in p plus p collisions at root s=510 GeV

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### Bibtex

@article{c496b5f6e2794c0d9dd259787f4900d0,

title = "Inclusive cross section and double-helicity asymmetry for pi(0) production at midrapidity in p plus p collisions at root s=510 GeV",

abstract = "PHENIX measurements are presented for the cross section and double-helicity asymmetry (A(LL)) in inclusive pi(0) production at midrapidity from p + p collisions at root s = 510 GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The pi(0)A(LL) results follow an increasingly positive asymmetry trend with p(T) and root s with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on pi(0) and jet A(LL) and suggested a positive contribution of gluon polarization to the spin of the proton Delta G for the gluon momentum fraction range x > 0.05. The data presented here extend to a currently unexplored region, down to x similar to 0.01, and thus provide additional constraints on the value of Delta G.",

author = "A. Adare and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and R. Akimoto and J. Alexander and M. Alfred and K. Aoki and N. Apadula and Y. Aramaki and H. Asano and Atomssa, {E. T.} and Awes, {T. C.} and B. Azmoun and V. Babintsev and M. Bai and X. Bai and Bandara, {N. S.} and B. Bannier and Barish, {K. N.} and S. Bathe and V. Baublis and C. Baumann and S. Baumgart and A. Bazilevsky and M. Beaumier and S. Beckman and R. Belmont and A. Berdnikov and Y. Berdnikov and D. Black and Blau, {D. S.} and Bok, {J. S.} and K. Boyle and Brooks, {M. L.} and J. Bryslawskyj and H. Buesching and V. Bumazhnov and S. Butsyk and S. Campbell and Chen, {C. -H.} and Chi, {C. Y.} and M. Chiu and Choi, {I. J.} and Choi, {J. B.} and S. Choi and Peter Christiansen and T. Chujo and V. Cianciolo and Z. Citron and Cole, {B. A.} and N. Cronin and N. Crossette and M. Csanad and T. Csoergo and Danley, {T. W.} and A. Datta and Daugherity, {M. S.} and G. David and K. DeBlasio and K. Dehmelt and A. Denisov and A. Deshpande and Desmond, {E. J.} and L. Ding and A. Dion and Diss, {P. B.} and Do, {J. H.} and L. D'Orazio and O. Drapier and A. Drees and Drees, {K. A.} and Durham, {J. M.} and A. Durum and T. Engelmore and A. Enokizono and H. En'yo and S. Esumi and Eyser, {K. O.} and B. Fadem and N. Feege and Fields, {D. E.} and M. Finger and {Finger Jr.}, M. and F. Fleuret and Fokin, {S. L.} and Frantz, {J. E.} and A. Franz and Frawley, {A. D.} and Y. Fukao and T. Fusayasu and K. Gainey and C. Gal and P. Gallus and P. Garg and A. Garishvili and I. Garishvili and H. Ge and F. Giordano and A. Glenn and X. Gong and M. Gonin and Y. Goto and {de Cassagnac}, {R. Granier} and N. Grau and Greene, {S. V.} and Perdekamp, {M. Grosse} and Y. Gu and T. Gunji and H. Guragain and T. Hachiya and Haggerty, {J. S.} and Hahn, {K. I.} and H. Hamagaki and Hamilton, {H. F.} and Han, {S. Y.} and J. Hanks and S. Hasegawa and Haseler, {T. O. S.} and K. Hashimoto and R. Hayano and X. He and Hemmick, {T. K.} and T. Hester and Hill, {J. C.} and Hollis, {R. S.} and K. Homma and B. Hong and T. Hoshino and N. Hotvedt and J. Huang and S. Huang and T. Ichihara and Y. Ikeda and K. Imai and Y. Imazu and M. Inaba and A. Iordanova and D. Isenhower and A. Isinhue and D. Ivanishchev and Jacak, {B. V.} and Jeon, {S. J.} and M. Jezghani and J. Jia and X. Jiang and Johnson, {B. M.} and E. Joo and Joo, {K. S.} and D. Jouan and Jumper, {D. S.} and J. Kamin and S. Kanda and Kang, {B. H.} and Kang, {J. H.} and Kang, {J. S.} and J. Kapustinsky and D. Kawall and Kazantsev, {A. V.} and Key, {J. A.} and V. Khachatryan and Khandai, {P. K.} and A. Khanzadeev and K. Kihara and Kijima, {K. M.} and C. Kim and Kim, {D. H.} and Kim, {D. J.} and Kim, {E. -J.} and Kim, {G. W.} and Kim, {H. -J.} and M. Kim and Kim, {Y. -J.} and Kim, {Y. K.} and B. Kimelman and E. Kistenev and R. Kitamura and J. Klatsky and D. Kleinjan and P. Kline and T. Koblesky and M. Kofarago and B. Komkov and J. Koster and D. Kotchetkov and D. Kotov and F. Krizek and K. Kurita and M. Kurosawa and Y. Kwon and R. Lacey and Lai, {Y. S.} and Lajoie, {J. G.} and A. Lebedev and Lee, {D. M.} and Lee, {G. H.} and J. Lee and Lee, {K. B.} and Lee, {K. S.} and S. Lee and Lee, {S. H.} and Leitch, {M. J.} and M. Leitgab and B. Lewis and X. Li and Lim, {S. H.} and Liu, {M. X.} and D. Lynch and Maguire, {C. F.} and Makdisi, {Y. I.} and M. Makek and A. Manion and Manko, {V. I.} and E. Mannel and T. Maruyama and M. McCumber and McGaughey, {P. L.} and D. McGlinchey and C. McKinney and A. Meles and M. Mendoza and B. Meredith and Y. Miake and T. Mibe and Mignerey, {A. C.} and Miller, {A. J.} and A. Milov and Mishra, {D. K.} and Mitchell, {J. T.} and S. Miyasaka and S. Mizuno and Mohanty, {A. K.} and S. Mohapatra and P. Montuenga and T. Moon and Morrison, {D. P.} and M. Moskowitz and Moukhanova, {T. V.} and T. Murakami and J. Murata and A. Mwai and T. Nagae and S. Nagamiya and K. Nagashima and Nagle, {J. L.} and Nagy, {M. I.} and I. Nakagawa and H. Nakagomi and Y. Nakamiya and Nakamura, {K. R.} and T. Nakamura and K. Nakano and C. Nattrass and Netrakanti, {P. K.} and M. Nihashi and T. Niida and S. Nishimura and R. Nouicer and T. Novak and N. Novitzky and Nyanin, {A. S.} and E. O'Brien and Ogilvie, {C. A.} and H. Oide and K. Okada and Koop, {J. D. Orjuela} and Osborn, {J. D.} and Anders Oskarsson and H. Ozaki and K. Ozawa and R. Pak and V. Pantuev and V. Papavassiliou and Park, {I. H.} and Park, {J. S.} and S. Park and Park, {S. K.} and Pate, {S. F.} and L. Patel and M. Patel and Peng, {J. -C.} and Perepelitsa, {D. V.} and Perera, {G. D. N.} and Peressounko, {D. Yu} and J. Perry and R. Petti and C. Pinkenburg and R. Pinson and Pisani, {R. P.} and Purschke, {M. L.} and H. Qu and J. Rak and Ramson, {B. J.} and I. Ravinovich and Read, {K. F.} and D. Reynolds and V. Riabov and Y. Riabov and E. Richardson and T. Rinn and N. Riveli and D. Roach and Rolnick, {S. D.} and M. Rosati and Z. Rowan and Rubin, {J. G.} and Ryu, {M. S.} and B. Sahlmueller and N. Saito and T. Sakaguchi and H. Sako and V. Samsonov and M. Sarsour and S. Sato and S. Sawada and B. Schaefer and Schmoll, {B. K.} and K. Sedgwick and J. Seele and R. Seidl and Y. Sekiguchi and A. Sen and R. Seto and P. Sett and A. Sexton and D. Sharma and A. Shaver and I. Shein and Shibata, {T. -A.} and K. Shigaki and M. Shimomura and K. Shoji and P. Shukla and A. Sickles and Silva, {C. L.} and David Silvermyr and Singh, {B. K.} and Singh, {C. P.} and V. Singh and M. Skolnik and M. Slunecka and M. Snowball and S. Solano and Soltz, {R. A.} and Sondheim, {W. E.} and Sorensen, {S. P.} and Sourikova, {I. V.} and Stankus, {P. W.} and P. Steinberg and Evert Stenlund and M. Stepanov and A. Ster and Stoll, {S. P.} and Stone, {M. R.} and T. Sugitate and A. Sukhanov and T. Sumita and J. Sun and J. Sziklai and A. Takahara and A. Taketani and Y. Tanaka and K. Tanida and Tannenbaum, {M. J.} and S. Tarafdar and A. Taranenko and E. Tennant and R. Tieulent and A. Timilsina and T. Todoroki and M. Tomasek and H. Torii and Towell, {C. L.} and M. Towell and R. Towell and Towell, {R. S.} and I. Tserruya and {van Hecke}, {H. W.} and M. Vargyas and E. Vazquez-Zambrano and A. Veicht and J. Velkovska and R. Vertesi and M. Virius and V. Vrba and E. Vznuzdaev and Wang, {X. R.} and D. Watanabe and K. Watanabe and Y. Watanabe and Watanabe, {Y. S.} and F. Wei and S. Whitaker and White, {A. S.} and S. Wolin and Woody, {C. L.} and M. Wysocki and B. Xia and L. Xue and S. Yalcin and Yamaguchi, {Y. L.} and A. Yanovich and S. Yokkaichi and Yoo, {J. H.} and I. Yoon and Z. You and I. Younus and H. Yu and Yushmanov, {I. E.} and Zajc, {W. A.} and A. Zelenski and S. Zhou and L. Zou",

year = "2016",

doi = "10.1103/PhysRevD.93.011501",

language = "English",

volume = "93",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-2368",

publisher = "American Physical Society",

number = "1",

}