Heavy-flavor electron-muon correlations in p plus p and d plus Au collisions at root s(NN)=200 GeV

A Adare,Serguei Afanasiev,C Aidala,N N Ajitanand,Y Akiba,H Albataineh,J P Alexander, A Angerami,Katsunori Aoki,N Apadula, L Aphecetche,Y Aramaki,J Asai,E T Atomssa, R Averbeck, T C Awes,B Azmoun,V Babintsev,Ming Bai,G Baksay,L Baksay, A Baldisseri,K N Barish,P D Barnes,B Bassalleck,Austin Basye,S Bathe,S Batsouli,V Baublis,C Baumann,A Bazilevsky,S Belikov,R Belmont,R Bennett,A Berdnikov,Y Berdnikov,Jihyun Bhom,A A Bickley, D Blau,J G Boissevain,J S Bok,H Borel,K Boyle,M L Brooks,H Buesching,V Bumazhnov,G Bunce,S Butsyk, C M Camacho,S Campbell,A Caringi,B S Chang,W C Chang,J L Charvet,C H Chen,S Chernichenko,C Y Chi,Minsen Chiu,I J Choi,J B Choi, R K Choudhury,P Christiansen,T Chujo,Pauchoo Chung,A Churyn,O Chvala,V Cianciolo,Zvi Hirsh Citron,B A Cole,Z Conesa Del Valle,M Connors,P Constantin,M Csanad, T Csoergo, T Dahms,S Dairaku,I Danchev,Kunal Das,Arindom Datta, G David,M K Dayananda,A Denisov,David Denterria,A Deshpande,E J Desmond,K V Dharmawardane,O Dietzsch,A Dion, M Donadelli,O Drapier,A Drees,K A Drees,A K Dubey,J M Durham,A Durum, D Dutta,V Dzhordzhadze,L Dorazio,S Edwards,Y V Efremenko, F Ellinghaus,T Engelmore,A Enokizono,H Enyo, S Esumi,K O Eyser,B Fadem,D E Fields,Michael Finger,F Fleuret,S L Fokin,Z Fraenkel,J E Frantz,A Franz,A D Frawley,K Fujiwara,Yoshio Fukao,T Fusayasu,I Garishvili,A Glenn,H Gong,M Gonin,J Gosset,Y Goto,R Granier De Cassagnac,N Grau,S V Greene,G Grim,M Grosse Perdekamp,T Gunji,Hansake Gustafsson,A Hadj Henni,J S Haggerty,K I Hahn, H Hamagaki,J Hamblen,Renzhi Han,J Hanks,E P Hartouni,K Haruna,E Haslum, R S Hayano, Xiaoping He,M Heffner,T K Hemmick,T Hester, J C Hill, M Hohlmann,W Holzmann,K Homma,B Hong,T Horaguchi,D Hornback, Shauku Huang,T Ichihara,R Ichimiya,H Iinuma,Yasuo Ikeda,Kiyotoshi Imai,J Imrek,Masayuki Inaba,D Isenhower,M Ishihara,T Isobe,M Issah,A Isupov,D Ivanischev,Yoshitaka Iwanaga,B V Jacak,Jia Jia, Xikui Jiang,Jie Jin,B M Johnson, T W Jones,K S Joo,D Jouan,D S Jumper,F Kajihara,S Kametani,N Kamihara,J Kamin, J H Kang,J S Kapustinsky,K Karatsu,Masaharu Kasai,D Kawall, Masayuki Kawashima,A V Kazantsev,T Kempel,A Khanzadeev,K M Kijima,J Kikuchi,Aeri Kim,Byung Il Kim,Duk Jae Kim, Edward J Kim, S H Kim,Y J Kim, E Kinney,K Kiriluk,A Kiss,E Kistenev,J Klay,C Kleinboesing,D Kleinjan,L Kochenda,B Komkov,M Konno,Jan Koster,Andrey V Kozlov, A Kral,A Kravitz,G J Kunde,K Kurita,M Kurosawa,M J Kweon,Youngwoo Kwon,G S Kyle,R Lacey,Yue Shi Lai,J G Lajoie,D Layton, A Lebedev, D M Lee, Jakyeong Lee,K B Lee,Taewoo Lee,M J Leitch, M A L Leite, B Lenzi,X Li,P Lichtenwalner,P Liebing, L A Linden Levy,T Liska,A Litvinenko, Hailang Liu,M X Liu,B Love,David W Lynch, C Maguire,Y I Makdisi,A Malakhov,M D Malik,V I Manko,E Mannel,Yaxian Mao,L Masek,H Masui,F Matathias,M Mccumber,P L Mcgaughey,D Mcglinchey,N Means,B Meredith, Y Miake,T Mibe, A C Mignerey,P Mikes,Koji Miki, A Milov,M K Mishra,J T Mitchell, A K Mohanty,Hee Jung Moon,Y Morino,A Morreale,D P Morrison,T V Moukhanova,D Mukhopadhyay, Tatsufumi Murakami,J Murata,S Nagamiya,J L Nagle,M Naglis,M I Nagy,I Nakagawa,Y Nakamiya,K Nakamura,Tomoaki Nakamura,Koji Nakano,Sangwook Nam,J Newby,M Nguyen,M Nihashi,T Niida,R Nouicer,A S Nyanin,C Oakley,E Obrien,S Oda,C A Ogilvie,Masaaki Oka,Kiyoshi Okada,Y Onuki, A Oskarsson,M Ouchida,K Ozawa,R Pak,A P T Palounek,V Pantuev, V Papavassiliou,I H Park, Jonghyeon Park, S K Park,W J Park,S F Pate,H Pei,J C Peng,H Pereira,V Peresedov,D Yu Peressounko,R Petti,C Pinkenburg,R P Pisani,M Proissl,M L Purschke,A K Purwar,Hongchang Qu,J Rak,A Rakotozafindrabe,I Ravinovich,K F Read,S Rembeczki,K Reygers,V Riabov,Y Riabov,E Richardson,D Roach,G Roche,S D Rolnick,M Rosati,C A Rosen,Sarah Rosendahl, P Rosnet, P A Rukoyatkin,P Ruzicka,V L Rykov,B Sahlmueller,N Saito,T Sakaguchi,S Sakai,K Sakashita,V Samsonov,S Sano, Tsuguo Sato

PHYSICAL REVIEW C（2014）

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摘要

Background: Heavy-flavor modification in relativistic p(d) + A collisions are sensitive to different kinds of strong-interaction physics ranging from modifications of the nuclear wave function to initial- and final-state energy loss. Modifications to single heavy-flavor particles and their decay leptons at midrapidity and forward rapidity are well established at the Relativistic Heavy Ion Collider (RHIC). Purpose: This paper presents measurements of azimuthal correlations of electron-muon pairs produced from heavy-flavor decays, primarily c (c) over bar, in root s(NN) = 200 GeV p + p and d + Au collision using the PHENIX detector at RHIC. The electrons are measured at midrapidity while the muons in the pair are measured at forward rapidity, defined as the direction of the deuteron beam, in order to utilize the deuteron to probe low-x partons in the gold nucleus. Methods: This analysis uses the central spectrometer arms for electron identification and forward spectrometer arms for muon identification. Azimuthal correlations are built in all sign combinations for e-mu pairs. Subtracting the like-sign yield from the unlike-sign yield removes the correlations from light flavor decays and conversions. Results: Comparing the p + p results with several different Monte Carlo event generators, we find the results are consistent with a total charm cross section sigma(c (c) over bar) = 538 +/- 46 (stat) +/- 197 (data syst) +/- 174 (model syst) mu b. These generators also indicate that the back-to-back peak at Delta phi = pi is dominantly from the leading-order contributions (gluon fusion), while higher-order processes (flavor excitation and gluon splitting) contribute to the yield at all Delta phi. We observe a suppression in the pair yield per collision in d + Au. We find the pair yield suppression factor for 2.7 < Delta phi < 3.2 rad is J(dA) = 0.433 +/- 0.087 (stat) +/- 0.135 (syst). Conclusions: The e-mu pairs result from partons at x(Au) similar to 10(-2) at Q(2) = 10 GeV/c(2) at the edge of the shadowing region. The pair suppression indicates modification to c (c) over bar pairs for these kinematics in the cold nuclear medium at RHIC.

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