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Event Structure and Double Helicity Asymmetry in Jet Production from Polarized p+p Collisions at sqrt(s) = 200 GeV

A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki Laurent Aphecetche 1 R. Armendariz S. H. Aronson J. Asai E. T. Atomssa 2 R. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri 3 K. N. Barish P. D. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov R. Bennett Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel 3 K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell B. S. Chang J. -L. Charvet 3 S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. R. Cleven B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. Dahms K. Das G. David M. B. Deaton K. Dehmelt H. Delagrange 1 A. Denisov D. d'Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier 2 A. Drees A. K. Dubey A. Durum V. Dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En'Yo S. Esumi K. O. Eyser D. E. Fields M. Finger Jr M. Finger F. Fleuret 2 S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat 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. -Å. Gustafsson T. Hachiya A. Hadj Henni 1 C. Haegemann J. S. Haggerty H. Hamagaki R. Han H. Harada E. P. Hartouni K. Haruna E. Haslum R. Hayano M. Heffner T. K. Hemmick T. Hester X. He H. Hiejima J. C. Hill R. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback T. Ichihara H. Iinuma K. Imai M. Inaba Y. Inoue D. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo D. Jouan 4 F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou D. Kawall A. V. Kazantsev A. Khanzadeev J. Kikuchi D. H. Kim D. J. Kim E. Kim E. Kinney Á. Kiss E. Kistenev A. Kiyomichi J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno D. Kotchetkov A. Kozlov A. Král A. Kravitz J. Kubart G. J. Kunde N. Kurihara K. Kurita M. J. Kweon Y. Kwon G. S. Kyle R. Lacey Y. S. Lai J. G. Lajoie A. Lebedev D. M. Lee M. K. Lee T. Lee M. J. Leitch M. A. L. Leite B. Lenzi T. Liška A. Litvinenko M. X. Liu X. Li B. Love D. Lynch C. F. Maguire Y. I. Makdisi A. Malakhov M. D. Malik V. I. Manko Y. Mao L. Mašek H. Masui F. Matathias M. Mccumber P. L. Mcgaughey Y. Miake P. Mikeš K. Miki T. E. Miller A. Milov S. Mioduszewski M. Mishra J. T. Mitchell M. Mitrovski A. Morreale D. P. Morrison T. V. Moukhanova D. Mukhopadhyay J. Murata S. Nagamiya Y. Nagata J. L. Nagle M. Naglis I. Nakagawa Y. Nakamiya T. Nakamura K. Nakano J. Newby M. Nguyen B. E. Norman R. Nouicer A. S. Nyanin E. O'Brien S. X. Oda C. A. Ogilvie H. Ohnishi K. Okada M. Oka O. O. Omiwade A. Oskarsson M. Ouchida K. Ozawa R. Pak D. Pal 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 G. Roche 5 A. Romana 2 M. Rosati S. S. E. Rosendahl P. Rosnet 5 P. Rukoyatkin V. L. Rykov B. Sahlmueller N. Saito T. Sakaguchi S. Sakai H. Sakata V. Samsonov S. Sato S. Sawada J. Seele R. Seidl V. Semenov R. Seto D. Sharma I. Shein A. Shevel T. -A. Shibata K. Shigaki M. Shimomura K. Shoji A. Sickles C. L. Silva D. Silvermyr C. Silvestre 3 K. S. Sim C. P. Singh V. Singh S. Skutnik M. Slunečka 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 J. Sziklai T. Tabaru S. Takagi E. M. Takagui A. Taketani Y. Tanaka K. Tanida M. J. Tannenbaum A. Taranenko P. Tarján T. L. Thomas M. Togawa A. Toia J. Tojo L. Tomášek H. Torii R. S. Towell V.-N. Tram 2 I. Tserruya Y. Tsuchimoto C. Vale H. Valle H. W. van Hecke J. Velkovska R. Vértesi A. A. Vinogradov M. Virius V. Vrba E. Vznuzdaev M. Wagner D. Walker X. R. Wang Y. Watanabe J. Wessels S. N. White D. Winter C. L. Woody M. Wysocki W. Xie Y. L. Yamaguchi A. Yanovich Z. Yasin J. Ying S. Yokkaichi G. R. Young I. Younus I. E. Yushmanov W. A. Zajc O. Zaudtke C. Zhang S. Zhou J. Zimányi L. Zolin
Abstract : We report on event structure and double helicity asymmetry ($A_LL$) of jet production in longitudinally polarized p+p collisions at $\sqrt{s}$=200 GeV. Photons and charged particles were measured at midrapidity $|\eta| < 0.35$ with the requirement of a high-momentum ($>2$ GeV/$c$) photon in each event. Measured event structure is compared with {\sc pythia} and {\sc geant} simulations. 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 $p_T$ sum ($p_T^{\rm reco}$). The effect of detector response and the underlying events on $p_T^{\rm reco}$ was evaluated with the simulation. The production rate of reconstructed jets is satisfactorily reproduced with the NLO pQCD jet production cross section. For $4 < p_T^{\rm reco} < 12$ GeV/$c$ with an average beam polarization of $< P > = 49%$ we measured $A_{LL} = -0.0014 \pm 0.0037^{\rm stat}$ at the lowest $p_T^{\rm reco}$ bin (4-5 GeV/$c$) and $-0.0181 \pm 0.0282^{\rm stat}$ at the highest $p_T^{\rm reco}$ 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 $p_T^{\rm reco}$ range arise primarily from hard-scattered gluons with momentum fraction $0.02 < x < 0.3$ according to {\sc pythia}. The measured $A_{LL}$ is compared with predictions that assume various $\Delta G(x)$ distributions based on the GRSV parameterization. The present result imposes the limit $-1.1 < \int_{0.02}^{0.3}dx \Delta G(x, \mu^2 = 1 {\rm GeV}^2) < 0.4$ at 95% confidence level or $\int_{0.02}^{0.3}dx \Delta G(x, \mu^2 = 1 {\rm GeV}^2) < 0.5$ at 99% confidence level.
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Submitted on : Monday, September 27, 2010 - 3:47:09 PM
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A. Adare, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, et al.. Event Structure and Double Helicity Asymmetry in Jet Production from Polarized p+p Collisions at sqrt(s) = 200 GeV. Physical Review D, American Physical Society, 2011, 84, pp.012006. ⟨10.1103/PhysRevD.84.012006⟩. ⟨in2p3-00521468⟩

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