Inclusive double-helicity asymmetries in neutral-pion and eta-meson production inp→+p→collisions ats=200 GeV

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RESEARCH PRODUCT

Inclusive double-helicity asymmetries in neutral-pion and eta-meson production inp→+p→collisions ats=200 GeV

T. Hester K. B. Lee T. Murakami Kensuke Homma E. Richardson V. S. Pantuev K. R. Andrews R. A. Soltz N. Grau N. Grau Motoi Inaba R. M. Wright M. Grosse Perdekamp F. Giordano B. Bassalleck Y. Ikeda S. Dairaku Hongfang Liu D. E. Fields B. V. Jacak Y. Miyachi M. E. Connors X. He J. Hamblen M. Konno R. Akimoto M. Sarsour Mate Csanad A. Iordanova K. Karatsu J. Ben-benjamin Y. Nakamiya C. Pinkenburg B. Sahlmueller B. Sahlmueller Y. J. Kim M. Mccumber M. Mccumber J. T. Mitchell H. A. Gustafsson T. Jones Peter Christiansen Y. Hori Anne Marie Sickles D. Roach K. M. Kijima X. Jiang Y. Aramaki A. V. Kazantsev S. Sawada J. Ying A. Franz M. Nihashi K. Okada H. En'yo G. Roche R. Seidl Vladislav Manko M. Slunečka Ajit Kumar Mohanty D. Winter Maya Hachiya Shimomura D. Yu Peressounko Robert Vertesi C. Vale R. S. Hollis T. A. Shibata C. L. Silva T. Sato M. J. Leitch R. P. Pisani Y. J. Mao Vladimir Samsonov J. Hanks A. Kiss K. Hashimoto M. Mendoza G. R. Young Viktor Riabov Aaron Angerami S. N. White Beomkyu Kim O. Dietzsch Deepa Thomas J. H. Kang Xingguo Li Y. I. Makdisi Sung Keun Park M. Virius Manabu Togawa N. N. Ajitanand Zvi Hirsh Citron J. Koster C. L. Woody J. S. Haggerty S. R. Lee L. Tomášek B. Komkov Y. Tanaka Henner Buesching M. Gonin J. Huang J. Huang J. S. Yoo K. Utsunomiya M. K. Dayananda C. Gal E. Mannel Norio Saito Takahiro Nakamura Tsutomu Mibe W. A. Zajc X. Gong V. Baublis A. Denisov Yuki Watanabe V. Cianciolo Julia Velkovska K. Nakano Atsushi Takahara D. Mcglinchey D. Mcglinchey M. Wysocki K. A. Drees W. E. Sondheim B. Bannier Sergey Fokin Tamas Ferenc Csorgo M. A. L. Leite C. H. Chen Y. J. Kwon M. J. Tannenbaum H. H. Shim Hiromi Iinuma M. Rosati A. Sukhanov K. Kurita D. Ivanischev L. A. Linden Levy Prashant Shukla H. Torii S. H. Lim Y. S. Lai J. L. Nagle D. John P. Castera A. Manion I. J. Choi I. J. Choi E. Tennant K. Boyle T. Ichihara H. Masui S. F. Pate Ke. Nakamura R. Armendariz L. Patel R. Belmont J. S. Kapustinsky V. Babintsev T. C. Awes A. Durum H. Pereira Senta Greene A. T. Basye D. Isenhower Y. Morino Martin Purschke Kyoichiro Ozawa C. A. Aidala C. A. Aidala Takahiro Fusayasu Y. L. Yamaguchi B. Fadem T. Sodre M. Tomášek J. S. Bok S. Bathe Alice Mignerey M. Chiu G. S. Kyle S. Motschwiller E. O'brien L. D'orazio Jongmin Lee Alexander Milov H. Qu James Alexander S. Tarafdar Takao Sakaguchi V. Papavassiliou Jiangyong Jia Jiangyong Jia Y. Goto A. Veicht C. A. Ogilvie C. Silvestre D. Silvermyr J. S. Kang Byung-sik Hong A. Bazilevsky A. D. Frawley I. Nakagawa Young-ki Kim B. Love T. Engelmore H. J. Moon Minghui Liu T. K. Hemmick H. W. Van Hecke S. Yokkaichi J. M. Durham J. M. Durham Yasuo Miake Eva Haslum S. Huang D. Lynch K. V. Dharmawardane Marisilvia Donadelli V. Bumazhnov Hideki Hamagaki K. Aoki O. Drapier I. V. Sourikova D. Kleinjan Eric Appelt Alexandre Lebedev Charles Maguire W. Holzmann D. M. Lee Kenneth Francis Read Kenneth Francis Read S. P. Sorensen A. Yanovich D. Broxmeyer L. Kochenda M. Issah E. R. Kinney Agneta Oskarsson G. David K. I. Hahn A. Taketani Taku Gunji J. Newby D. P. Morrison S. Campbell D. Hornback O. Chvala B. H. Kang Kiyoshi Tanida Kiyoshi Tanida S. H. Lee Y. Akiba A. Morreale B. Meredith R. Pak E. Kistenev I. Ravinovich C. Mckinney S. Nagamiya D. Watanabe R. Tanabe Vaclav Vrba E. Vznuzdaev P. L. Mcgaughey M. Ouchida K. Watanabe Klaus Johannes Reygers Rui Wei H. Al-ta'ani Tatsuya Chujo N. Means John Hill J. G. Lajoie A. Taranenko M. Bai Byoungchoo Park K. Shoji E. C. Aschenauer Kazushi Miki T. Horaguchi Jen-chieh Peng C. Oakley A. Drees C. Harper J. Sun R. Seto T. Sugitate45 Brajesh K. Singh J. E. Frantz H. Pei R. K. Choudhury S. Butsyk P. W. Stankus Zhiying You Zhiying You R. Bennett K. S. Joo S. Zhou Rushan Han D. Kotov M. Finger Ryugo S. Hayano S. D. Rolnick François Fleuret Inkyu Park Y. Riabov N. Apadula Jason Kamin Xiong Wang S. P. Stoll Kenta Shigaki M. Nguyen K. N. Barish Z. Conesa Del Valle A. Vossen Dong Jo Kim A. S. Nyanin S. S.e. Rosendahl G. Bunce Rachid Nouicer A. N. Zelenski M. Proissl S. Sano T. Kempel S. Esumi D. Sharma S. Kaneti D. Jouan A. Enokizono A. Dion A. Dion M. I. Nagy R. Ichimiya I. Tserruya Johannes Peter Wessels M. L. Brooks Yu. Efremenko V. Singh B. Azmoun A. Král A. Glenn A. Datta Eunja Kim M. Oka P. Kline K. S. Lee Dmitry Blau E. J. Desmond E. Vazquez-zambrano M. Kasai Y. Tsuchimoto Y. Iwanaga I. E. Yushmanov L. Guo Alexei Khanzadeev E. Stenlund J. B. Choi T. V. Moukhanova A. Deshpande Y. Watanabe I. Younus I. Younus D. Kawall H. Themann J. Murata Gerd Joachim Kunde I. Shein K. Sedgwick C. Baumann M. Naglis Masayasu Ishihara C. P. Singh B. M. Johnson R. J. Petti J. Sziklai Brian Cole M. Kurosawa M. Savastio E. M. Takagui R. S. Towell I. Garishvili F. Wei C. Y. Chi K. S. Sim R. Yang S. Taneja K. Imai K. Imai Jan Rak R. Lacey R. Granier De Cassagnac A. Adare Y. Fukao

subject

Physics Nuclear and High Energy Physics Particle physics Scattering media_common.quotation_subject Eta meson Polarization (waves)Helicity Asymmetry Gluon Nuclear physics Pion High Energy Physics::Experiment Relativistic Heavy Ion Collider media_common

description

Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, A(LL), for pi(0) and eta production in root s = 200 GeV polarized p + p collisions. Comparison of the pi(0) results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, Delta G, in the proton in the probed Bjorken x range. The effect of adding the new 2009 pi(0) data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit Delta G(DSSV)([0.05,0.2]) = 0.06(-0.15)(+0.11) in the range 0.05 < x < 0.2, with the uncertainty at Delta chi(2) = 9 when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of Delta G(DSSV)([0.05,0.2]) between 0.02 and 0.12, demonstrating the need for full treatment of the experimental systematic uncertainties in future global analyses.

year	journal	country	edition	language
2014-07-17	Physical Review D

https://doi.org/10.1103/physrevd.90.012007