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arxiv: 1702.01084 · v2 · submitted 2017-02-03 · ⚛️ nucl-ex

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Measurements of e^+e^- pairs from open heavy flavor in p+p and d+A collisions at sqrt{s_{NN}}=200 GeV

A. Adare , S. Afanasiev , C. Aidala , N.N. Ajitanand , Y. Akiba , H. Al-Bataineh , J. Alexander , M. Alfred
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K. Aoki N. Apadula L. Aphecetche J. Asai E.T. Atomssa R. Averbeck T.C. Awes C. Ayuso B. Azmoun V. Babintsev A. Bagoly 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 C. Baumann A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A.A. Bickley D.S. Blau M. Boer J.G. Boissevain J.S. Bok H. Borel K. Boyle M.L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce C. Butler S. Butsyk C.M. Camacho S. Campbell V. Canoa Roman B.S. Chang W.C. Chang J.-L. Charvet S. Chernichenko C.Y. Chi M. Chiu I.J. Choi R.K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron B.A. Cole M. Connors P. Constantin M. Csan\'ad T. Cs\"org\H{o} T. Dahms S. Dairaku T.W. Danley K. Das M.S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov D. d'Enterria A. Deshpande E.J. Desmond O. Dietzsch A. Dion J.H. Do M. Donadelli O. Drapier A. Drees K.A. Drees A.K. Dubey M. Dumancic J.M. Durham A. Durum D. Dutta V. Dzhordzhadze Y.V. Efremenko T. Elder F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi K.O. Eyser B. Fadem W. Fan N. Feege D.E. Fields M. Finger M. Finger Jr. F. Fleuret S.L. Fokin Z. Fraenkel J.E. Frantz A. Franz A.D. Frawley K. Fujiwara Y. Fukao Y. Fukuda T. Fusayasu C. Gal P. Garg I. Garishvili H. Ge A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S.V. Greene M. Grosse Perdekamp T. Gunji H.-{\AA}. Gustafsson T. Hachiya A. Hadj Henni J.S. Haggerty K.I. Hahn H. Hamagaki R. Han S.Y. Han E.P. Hartouni K. Haruna S. Hasegawa T.O.S. Haseler E. Haslum R. Hayano X. He M. Heffner T.K. Hemmick T. Hester J.C. Hill K. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov Y. Ito D. Ivanishchev B.V. Jacak Z. Ji J. Jia J. Jin B.M. Johnson K.S. Joo V. Jorjadze D. Jouan D.S. Jumper F. Kajihara S. Kametani N. Kamihara J. Kamin J.H. Kang D. Kapukchyan J. Kapustinsky S. Karthas D. Kawall A.V. Kazantsev T. Kempel V. Khachatryan A. Khanzadeev K.M. Kijima J. Kikuchi B.I. Kim C. Kim D.H. Kim D.J. Kim E. Kim E.-J. Kim M. Kim S.H. Kim D. Kincses E. Kinney K. Kiriluk \'A. Kiss E. Kistenev J. Klay C. Klein-Boesing T. Koblesky L. Kochenda B. Komkov M. Konno J. Koster D. Kotov A. Kozlov A. Kr\'al A. Kravitz S. Kudo G.J. Kunde K. Kurita M. Kurosawa M.J. Kweon Y. Kwon G.S. Kyle R. Lacey Y.S. Lai J.G. Lajoie E.O. Lallow D. Layton A. Lebedev D.M. Lee K.B. Lee T. Lee M.J. Leitch M.A.L. Leite B. Lenzi Y.H. Leung N.A. Lewis X. Li P. Liebing S.H. Lim T. Li\v{s}ka A. Litvinenko H. Liu L. D. Liu M.X. Liu V.-R. Loggins S. Lokos B. Love D. Lynch C.F. Maguire T. Majoros Y.I. Makdisi M. Makek M. Malaev A. Malakhov M.D. Malik V.I. Manko E. Mannel Y. Mao L. Ma\v{s}ek H. Masuda H. Masui F. Matathias M. McCumber P.L. McGaughey D. McGlinchey N. Means B. Meredith W.J. Metzger Y. Miake A.C. Mignerey D.E. Mihalik P. Mike\v{s} K. Miki A. Milov D.K. Mishra M. Mishra J.T. Mitchell G. Mitsuka A.K. Mohanty T. Moon Y. Morino A. Morreale D.P. Morrison S.I.M. Morrow T.V. Moukhanova D. Mukhopadhyay T. Murakami J. Murata K. Nagai S. Nagamiya K. Nagashima T. Nagashima J.L. Nagle M. Naglis M.I. Nagy I. Nakagawa H. Nakagomi Y. Nakamiya T. Nakamura K. Nakano C. Nattrass J. Newby M. Nguyen T. Niida R. Nouicer T. Nov\'ak N. Novitzky R. Novotny A.S. Nyanin E. O'Brien S.X. Oda C.A. Ogilvie M. Oka K. Okada Y. Onuki J.D. Orjuela Koop J.D. Osborn A. Oskarsson M. Ouchida K. Ozawa R. Pak A.P.T. Palounek V. Pantuev V. Papavassiliou J. Park J.S. Park S. Park W.J. Park S.F. Pate M. Patel H. Pei J.-C. Peng W. Peng H. Pereira D.V. Perepelitsa G.D.N. Perera V. Peresedov D.Yu. Peressounko C.E. PerezLara R. Petti M. Phipps C. Pinkenburg A. Pun M.L. Purschke A.K. Purwar H. Qu P.V. Radzevich J. Rak A. Rakotozafindrabe I. Ravinovich K.F. Read S. Rembeczki K. Reygers V. Riabov Y. Riabov D. Richford T. Rinn D. Roach G. Roche S.D. Rolnick M. Rosati S.S.E. Rosendahl P. Rosnet Z. Rowan P. Rukoyatkin J. Runchey P. Ru\v{z}i\v{c}ka V.L. Rykov B. Sahlmueller N. Saito T. Sakaguchi S. Sakai K. Sakashita H. Sako V. Samsonov M. Sarsour K. Sato S. Sato T. Sato S. Sawada B. Schaefer B.K Schmoll B.K. Schmoll K. Sedgwick J. Seele R. Seidl A.Yu. Semenov V. Semenov A. Sen R. Seto A. Sexton D. Sharma I. Shein T.-A. Shibata K. Shigaki M. Shimomura K. Shoji P. Shukla A. Sickles C.L. Silva D. Silvermyr C. Silvestre K.S. Sim B.K. Singh C.P. Singh V. Singh M. J. Skoby M. Slune\v{c}ka K.L. 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 A. Sukhanov S. Syed J. Sziklai E.M. Takagui A Takeda A. Taketani R. Tanabe Y. Tanaka K. Tanida M.J. Tannenbaum S. Tarafdar A. Taranenko P. Tarj\'an G. Tarnai H. Themann T.L. Thomas R. Tieulent A. Timilsina M. Togawa A. Toia L. Tom\'a\v{s}ek M. Tom\'a\v{s}ek Y. Tomita H. Torii C.L. Towell R.S. Towell V-N. Tram I. Tserruya Y. Tsuchimoto Y. Ueda B. Ujvari C. Vale H. Valle H.W. van Hecke S. Vazquez-Carson A. Veicht J. Velkovska R. V\'ertesi A.A. Vinogradov M. Virius V. Vrba E. Vznuzdaev X.R. Wang Z. Wang Y. Watanabe F. Wei J. Wessels S.N. White D. Winter C.P. Wong C.L. Woody M. Wysocki W. Xie C. Xu Q. Xu Y.L. Yamaguchi K. Yamaura R. Yang A. Yanovich P. Yin J. Ying S. Yokkaichi J.H. Yoo I. Yoon G.R. Young I. Younus H. Yu I.E. Yushmanov W.A. Zajc O. Zaudtke C. Zhang S. Zharko S. Zhou L. Zolin L. Zou
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keywords datageneratorscollisionsmassobservedpairssqrtthree
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We report a measurement of $e^+e^-$ pairs from semileptonic heavy-flavor decays in $p$+$p$ collisions at $\sqrt{s_{NN}}=200$~GeV. The $e^+e^-$ pair yield from $b\bar{b}$ and $c\bar{c}$ is separated by exploiting a double differential fit done simultaneously in dielectron invariant mass and $p_T$. We used three different event generators, {\sc pythia}, {\sc mc@nlo}, and {\sc powheg}, to simulate the $e^+e^-$ spectra from $c\bar{c}$ and $b\bar{b}$ production. The data can be well described by all three generators within the detector acceptance. However, when using the generators to extrapolate to $4\pi$, significant differences are observed for the total cross section. These difference are less pronounced for $b\bar{b}$ than for $c\bar{c}$. The same model dependence was observed in already published $d$+$A$ data. The $p$+$p$ data are also directly compared with $d$+$A$ data in mass and $p_T$, and within the statistical accuracy no nuclear modification is seen.

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