Event structure and double helicity asymmetry in jet production from polarized p plus p collisions at root s=200 GeV

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title = "Event structure and double helicity asymmetry in jet production from polarized p plus p collisions at root s=200 GeV",
abstract = "We report on the event structure and double helicity asymmetry (A(LL)) of jet production in longitudinally polarized p + p collisions at root s = 200 GeV. Photons and charged particles were measured by the PHENIX experiment at midrapidity vertical bar eta vertical bar < 0.35 with the requirement of a high-momentum (> 2 GeV/c) photon in the event. Event structure, such as multiplicity, p(T) density and thrust in the PHENIX acceptance, were measured and compared with the results from the PYTHIA event generator and the GEANT detector simulation. The shape of jets and the underlying event were well reproduced at this collision energy. For the measurement of jet A(LL), photons and charged particles were clustered with a seed-cone algorithm to obtain the cluster pT sum (p(T)(reco)). The effect of detector response and the underlying events on p(T)(reco) was evaluated with the simulation. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order and perturbative quantum chromodynamics jet production cross section. For 4< p(T)(reco) < 12 GeV/c with an average beam polarization of < P > = 49% we measured Lambda(LL) = -0.0014 +/- 0.0037(stat) at the lowest p(T)(reco) bin (4-5 GeV= c) and -0.0181 +/- 0.0282(stat) at the highest p(T)(reco) bin (10-12 GeV= c) with a beam polarization scale error of 9.4% and a pT scale error of 10%. Jets in the measured p(T)(reco) range arise primarily from hard-scattered gluons with momentum fraction 0: 02 < x < 0: 3 according to PYTHIA. The measured A(LL) is compared with predictions that assume various Delta G(x) distributions based on the Gluck-Reya-Stratmann-Vogelsang parameterization. The present result imposes the limit -a.1 < integral(0.3)(0.02) dx Delta G(x, mu(2) = GeV2) < 0.4 at 95% confidence level or integral(0.3)(0.002) dx Delta G(x, mu(2) = 1 GeV2) < 0.5 at 99% confidence level.",
author = "A. Adare and S. Afanasiev and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and H. Al-Bataineh and J. Alexander and K. Aoki and L. Aphecetche and R. Armendariz and Aronson, {S. H.} and J. Asai and Atomssa, {E. T.} and R. Averbeck and Awes, {T. C.} and B. Azmoun and V. Babintsev and G. Baksay and L. Baksay and A. Baldisseri and Barish, {K. N.} and Barnes, {P. D.} and B. Bassalleck and S. Bathe and S. Batsouli and V. Baublis and A. Bazilevsky and S. Belikov and R. Bennett and Y. Berdnikov and Bickley, {A. A.} and Boissevain, {J. G.} and H. Borel and K. Boyle and Brooks, {M. L.} and H. Buesching and V. Bumazhnov and G. Bunce and S. Butsyk and S. Campbell and Chang, {B. S.} and J-L. Charvet and S. Chernichenko and Chi, {C. Y.} and J. Chiba and M. Chiu and Choi, {I. J.} and T. Chujo and P. Chung and A. Churyn and V. Cianciolo and Cleven, {C. R.} and Cole, {B. A.} and Comets, {M. P.} and P. Constantin and M. Csanad and T. Csoergo and T. Dahms and K. Das and G. David and Deaton, {M. B.} and K. Dehmelt and H. Delagrange and A. Denisov and D. d'Enterria and A. Deshpande and Desmond, {E. J.} and O. Dietzsch and A. Dion and M. Donadelli and O. Drapier and A. Drees and Dubey, {A. K.} and A. Durum and V. Dzhordzhadze and Efremenko, {Y. V.} and J. Egdemir and F. Ellinghaus and Emam, {W. S.} and A. Enokizono and H. En'yo and S. Esumi and Eyser, {K. O.} and Fields, {D. E.} and M. Finger and Finger, {M., Jr.} and F. Fleuret and Fokin, {S. L.} and Z. Fraenkel and Frantz, {J. E.} and A. Franz and Frawley, {A. D.} and K. Fujiwara and Y. Fukao and T. Fusayasu and S. Gadrat and I. Garishvili and A. Glenn and H. Gong and M. Gonin and J. Gosset and Y. Goto and {de Cassagnac}, {R. Granier} and N. Grau and Greene, {S. V.} and Perdekamp, {M. Grosse} and T. Gunji and Hans-{\AA}ke Gustafsson and T. Hachiya and Henni, {A. Hadj} and C. Haegemann and Haggerty, {J. S.} and H. Hamagaki and R. Han and H. Harada and Hartouni, {E. P.} and K. Haruna and Eva Haslum and R. Hayano and X. He and M. Heffner and Hemmick, {T. K.} and T. Hester and H. Hiejima and Hill, {J. C.} and R. Hobbs and M. Hohlmann and W. Holzmann and K. Homma and B. Hong and T. Horaguchi and D. Hornback and T. Ichihara and H. Iinuma and K. Imai and M. Inaba and Y. Inoue and D. Isenhower and L. Isenhower and M. Ishihara and T. Isobe and M. Issah and A. Isupov and Jacak, {B. V.} and J. Jia and J. Jin and O. Jinnouchi and Johnson, {B. M.} and Joo, {K. S.} and D. Jouan and F. Kajihara and S. Kametani and N. Kamihara and J. Kamin and M. Kaneta and Kang, {J. H.} and H. Kanou and D. Kawall and Kazantsev, {A. V.} and A. Khanzadeev and J. Kikuchi and Kim, {D. H.} and Kim, {D. J.} and E. Kim and E. Kinney and A. Kiss and E. Kistenev and A. Kiyomichi and J. Klay and C. Klein-Boesing and L. Kochenda and V. Kochetkov and B. Komkov and M. Konno and D. Kotchetkov and A. Kozlov and A. Kral and A. Kravitz and J. Kubart and Kunde, {G. J.} and N. Kurihara and K. Kurita and Kweon, {M. J.} and Y. Kwon and Kyle, {G. S.} and R. Lacey and Lai, {Y. S.} and Lajoie, {J. G.} and A. Lebedev and Lee, {D. M.} and Lee, {M. K.} and T. Lee and Leitch, {M. J.} and Leite, {M. A. L.} and B. Lenzi and X. Li and T. Liska and A. Litvinenko and Liu, {M. X.} and B. Love and D. Lynch and Maguire, {C. F.} and Makdisi, {Y. I.} and A. Malakhov and Malik, {M. D.} and Manko, {V. I.} and Y. Mao and L. Masek and H. Masui and F. Matathias and M. McCumber and McGaughey, {P. L.} and Y. Miake and P. Mikes and K. Miki and Miller, {T. E.} and A. Milov and S. Mioduszewski and M. Mishra and Mitchell, {J. T.} and M. Mitrovski and A. Morreale and Morrison, {D. P.} and Moukhanova, {T. V.} and D. Mukhopadhyay and J. Murata and S. Nagamiya and Y. Nagata and Nagle, {J. L.} and M. Naglis and I. Nakagawa and Y. Nakamiya and T. Nakamura and K. Nakano and J. Newby and M. Nguyen and Norman, {B. E.} and R. Nouicer and Nyanin, {A. S.} and E. O'Brien and Oda, {S. X.} and Ogilvie, {C. A.} and H. Ohnishi and M. Oka and K. Okada and Omiwade, {O. O.} and Anders Oskarsson and M. Ouchida and K. Ozawa and R. Pak and D. Pal and Palounek, {A. P. T.} and V. Pantuev and V. Papavassiliou and J. Park and Park, {W. J.} and Pate, {S. F.} and H. Pei and J-C. Peng and H. Pereira and V. Peresedov and Peressounko, {D. Yu.} and C. Pinkenburg and Purschke, {M. L.} and Purwar, {A. K.} and H. Qu and J. Rak and A. Rakotozafindrabe and I. Ravinovich and Read, {K. F.} and S. Rembeczki and M. Reuter and K. Reygers and V. Riabov and Y. Riabov and G. Roche and A. Romana and M. Rosati and Sarah Rosendahl and P. Rosnet and P. Rukoyatkin and Rykov, {V. L.} and B. Sahlmueller and N. Saito and T. Sakaguchi and S. Sakai and H. Sakata and V. Samsonov and S. Sato and S. Sawada and J. Seele and R. Seidl and V. Semenov and R. Seto and D. Sharma and I. Shein and A. Shevel and T-A. Shibata and K. Shigaki and M. Shimomura and K. Shoji and A. Sickles and Silva, {C. L.} and D. Silvermyr and C. Silvestre and Sim, {K. S.} and Singh, {C. P.} and V. Singh and S. Skutnik and M. Slunecka and A. Soldatov and Soltz, {R. A.} and Sondheim, {W. E.} and Sorensen, {S. P.} and Sourikova, {I. V.} and F. Staley and Stankus, {P. W.} and Evert Stenlund and M. Stepanov and A. Ster and Stoll, {S. P.} and T. Sugitate and C. Suire and J. Sziklai and T. Tabaru and S. Takagi and Takagui, {E. M.} and A. Taketani and Y. Tanaka and K. Tanida and Tannenbaum, {M. J.} and A. Taranenko and P. Tarjan and Thomas, {T. L.} and M. Togawa and A. Toia and J. Tojo and L. Tomasek and H. Torii and Towell, {R. S.} and V-N. Tram and I. Tserruya and Y. Tsuchimoto and C. Vale and H. Valle and {van Hecke}, {H. W.} and J. Velkovska and R. Vertesi and Vinogradov, {A. A.} and M. Virius and V. Vrba and E. Vznuzdaev and M. Wagner and D. Walker and Wang, {X. R.} and Y. Watanabe and J. Wessels and White, {S. N.} and D. Winter and Woody, {C. L.} and M. Wysocki and W. Xie and Yamaguchi, {Y. L.} and A. Yanovich and Z. Yasin and J. Ying and S. Yokkaichi and Young, {G. R.} and I. Younus and Yushmanov, {I. E.} and Zajc, {W. A.} and O. Zaudtke and C. Zhang and S. Zhou and J. Zimanyi and L. Zolin",
year = "2011",
doi = "10.1103/PhysRevD.84.012006",
language = "English",
volume = "84",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "1",