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Photon-Hadron Jet Correlations in p+p and Au+Au Collisions at sqrt(s_NN) = 200 GeV

A. Adare S. Afanasiev C. Aidala N.N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel 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 M. Bai G. Baksay L. Baksay A. Baldisseri K.N. Barish P.D. Barnes B. Bassalleck A.T. Basye S. Bathe S. Batsouli V. Baublis F. Bauer C. Baumann A. Bazilevsky S. Belikov R. Bennett A. Berdnikov Y. Berdnikov A.A. Bickley M.T. Bjorndal J.G. Boissevain H. Borel K. Boyle M.L. Brooks D.S. Brown D. Bucher H. Buesching V. Bumazhnov G. Bunce J.M. Burward-Hoy S. Butsyk C. Muñoz Camacho S. Campbell J.-S. Chai B.S. Chang W.C. Chang J.-L. Charvet S. Chernichenko J. Chiba C.Y. Chi M. Chiu I.J. Choi R.K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron C.R. Cleven Y. Cobigo B.A. Cole M.P. Comets 3 P. Constantin M. Csan'Ad T. Cs¨org˝o T. Dahms S. Dairaku K. Das G. David M.B. Deaton K. Dehmelt H. Delagrange 1 A. Denisov D. d'Enterria 2 A. Deshpande E.J. Desmond O. Dietzsch A. Dion M. Donadelli J.L. Drachenberg O. Drapier 2 A. Drees K.A. Drees A.K. Dubey A. Durum D. Dutta V. Dzhordzhadze Y.V. Efremenko J. Egdemir F. Ellinghaus W.S. Emam T. Engelmore A. Enokizono H. En'Yo B. Espagnon 3 S. Esumi K.O. Eyser B. Fadem D.E. Fields M. Finger F. Fleuret 2 S.L. Fokin B. Forestier Z. Fraenkel J.E. Frantz A. Franz A.D. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau 1 Marie Germain 1 A. Glenn H. Gong M. Gonin 2 J. Gosset Y. Goto R. Granier de Cassagnac 2 N. Grau S.V. Greene M. Grosse Perdekamp T. Gunji H.-°a. Gustafsson T. Hachiya A. Hadj Henni 1 C. Haegemann J.S. Haggerty M.N. Hagiwara H. Hamagaki R. Han H. Harada E.P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko R. Hayano M. Heffner T.K. Hemmick T. Hester J.M. Heuser X. He H. Hiejima J.C. Hill R. Hobbs M. Hohlmann M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang M.G. Hur T. Ichihara R. Ichimiya Y. Ikeda K. Imai J. Imrek M. Inaba Y. Inoue D. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B.V. Jacak J. Jia J. Jin O. Jinnouchi B.M. Johnson K.S. Joo D. Jouan 3 F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J.H. Kang H. Kanou J. Kapustinsky T. Kawagishi D. Kawall A.V. Kazantsev Steven Kelly T. Kempel A. Khanzadeev K.M. Kijima J. Kikuchi B.I. Kim D.H. Kim D.J. Kim E. Kim S.H. Kim Y.-S. Kim E. Kinney K. Kiriluk A. Kiss E. Kistenev A. Kiyomichi J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno J. Koster D. Kotchetkov A. Kozlov A. Kr'Al A. Kravitz P.J. Kroon J. Kubart G.J. Kunde N. Kurihara K. Kurita M. Kurosawa M.J. Kweon Y. Kwon G.S. Kyle R. Lacey Y.-S. Lai Y.S. Lai J.G. Lajoie D. Layton A. Lebedev Y. Le Bornec 3 S. Leckey D.M. Lee K.B. Lee M.K. Lee T. Lee M.J. Leitch M.A.L. Leite B. Lenzi P. Liebing H. Lim T. Liˇska A. Litvinenko Hong Liu M.X. Liu X. Li X.H. Li B. Love D. Lynch C.F. Maguire Y.I. Makdisi A. Malakhov M.D. Malik V.I. Manko E. Mannel Y. Mao L. Maˇsek H. Masui F. Matathias M.C. Mccain M. Mccumber P.L. Mcgaughey N. Means B. Meredith Y. Miake P. Mikeˇs K. Miki T.E. Miller A. Milov S. Mioduszewski G.C. Mishra M. Mishra J.T. Mitchell M. Mitrovski A.K. Mohanty Y. Morino A. Morreale D.P. Morrison J.M. Moss T.V. Moukhanova D. Mukhopadhyay J. Murata S. Nagamiya Y. Nagata J.L. Nagle M. Naglis M.I. Nagy I. Nakagawa Y. Nakamiya T. Nakamura K. Nakano J. Newby M. Nguyen T. Niita B.E. Norman R. Nouicer A.S. Nyanin J. Nystrand E. O'Brien S.X. Oda C.A. Ogilvie H. Ohnishi I.D. Ojha H. Okada K. Okada M. Oka O.O. Omiwade Y. Onuki A. Oskarsson I. Otterlund 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 V. Peresedov D.Yu. Peressounko C. Pinkenburg R.P. Pisani 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 D. Roach G. Roche 4 S.D. Rolnick A. Romana 2 M. Rosati S.S.E. Rosendahl P. Rosnet 4 P. Rukoyatkin P. Ruˇziˇcka V.L. Rykov S.S. Ryu B. Sahlmueller N. Saito T. Sakaguchi S. Sakai K. Sakashita H. Sakata V. Samsonov H.D. Sato S. Sato T. Sato S. Sawada K. Sedgwick J. Seele R. Seidl A.Yu. Semenov V. Semenov R. Seto D. Sharma T.K. Shea I. Shein A. Shevel T.-A. Shibata K. Shigaki M. Shimomura T. Shohjoh K. Shoji P. Shukla A. Sickles C.L. Silva D. Silvermyr C. Silvestre K.S. Sim B.K. Singh C.P. Singh V. Singh S. Skutnik M. Sluneˇcka W.C. Smith A. Soldatov R.A. Soltz W.E. Sondheim S.P. Sorensen I.V. Sourikova F. Staley P.W. Stankus E. Stenlund M. Stepanov A. Ster S.P. Stoll T. Sugitate C. Suire 3 A. Sukhanov J.P. Sullivan J. Sziklai T. Tabaru S. Takagi E.M. Takagui A. Taketani R. Tanabe K.H. Tanaka Y. Tanaka K. Tanida M.J. Tannenbaum A. Taranenko P. Tarj'An H. Themann T.L. Thomas M. Togawa A. Toia J. Tojo L. Tom'Aˇsek Y. Tomita H. Torii R.S. Towell V.-N. Tram 2 I. Tserruya Y. Tsuchimoto S.K. Tuli H. Tydesj¨o N. Tyurin C. Vale H. Valle H.W. van Hecke A. Veicht J. Velkovska R. Vertesi A.A. Vinogradov M. Virius V. Vrba E. Vznuzdaev M. Wagner D. Walker X.R. Wang Y. Watanabe F. Wei J. Wessels S.N. White N. Willis 3 D. Winter C.L. Woody M. Wysocki W. Xie Y.L. Yamaguchi K. Yamaura R. Yang 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. Zim'Anyi L. Zolin
Abstract : We report the observation at the Relativistic Heavy Ion Collider (RHIC) of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron background. The initial momentum of the away-side parton is tightly constrained, because the parton-photon pair exactly balance in momentum at leading order in perturbative quantum chromodynamics (pQCD), making such correlations a powerful probe of the in-medium parton energy loss. The away-side nuclear suppression factor, I_AA, in central Au+Au collisions, is 0.32 +/- 0.12(stat) +/- 0.09(syst) for hadrons of 3 < p_T < 5 in coincidence with photons of 5 < p_T < 15 GeV/c. The suppression is comparable to that observed for high-p_T single hadrons and dihadrons. The direct photon associated yields in p+p collisions scale approximately with the momentum balance, z_T = p_T^hadron/p_T^photon, as expected for a measure of the away-side parton fragmentation function. We compare to Au+Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss.
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Submitted on : Tuesday, April 21, 2009 - 2:40:19 PM
Last modification on : Tuesday, January 5, 2021 - 1:38:04 PM

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A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Photon-Hadron Jet Correlations in p+p and Au+Au Collisions at sqrt(s_NN) = 200 GeV. Physical Review C, American Physical Society, 2009, 80, pp.024908. ⟨10.1103/PhysRevC.80.024908⟩. ⟨in2p3-00377305⟩

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