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Low-p_T e⁺e⁻ pair production in Au+Au collisions at sqrt{s_(NN)} = 200 GeV and U+U collisions at sqrt{s_(NN)} = 193 GeV at STAR

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arxiv 1806.02295 v3 pith:EKH6EJGM submitted 2018-06-06 hep-ex nucl-ex

Low-p_T e⁺e⁻ pair production in Au+Au collisions at sqrt{s_(NN)} = 200 GeV and U+U collisions at sqrt{s_(NN)} = 193 GeV at STAR

J. Adam , L. Adamczyk , J. R. Adams , J. K. Adkins , G. Agakishiev , M. M. Aggarwal , Z. Ahammed , N. N. Ajitanand
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I. Alekseev D. M. Anderson R. Aoyama A. Aparin D. Arkhipkin E. C. Aschenauer M. U. Ashraf F. Atetalla A. Attri G. S. Averichev X. Bai V. Bairathi K. Barish A. J. Bassill A. Behera R. Bellwied A. Bhasin A. K. Bhati J. Bielcik J. Bielcikova L. C. Bland I. G. Bordyuzhin J. D. Brandenburg A. V. Brandin D. Brown J. Bryslawskyj I. Bunzarov J. Butterworth H. Caines M. Calder\'on de la Barca S\'anchez J. M. Campbell D. Cebra I. Chakaberia P. Chaloupka F-H. Chang Z. Chang N. Chankova-Bunzarova A. Chatterjee S. Chattopadhyay J. H. Chen X. Chen J. Cheng M. Cherney W. Christie G. Contin H. J. Crawford S. Das T. G. Dedovich I. M. Deppner A. A. Derevschikov L. Didenko C. Dilks X. Dong J. L. Drachenberg J. C. Dunlop L. G. Efimov N. Elsey J. Engelage G. Eppley R. Esha S. Esumi O. Evdokimov J. Ewigleben O. Eyser R. Fatemi S. Fazio P. Federic P. Federicova J. Fedorisin P. Filip E. Finch Y. Fisyak C. E. Flores L. Fulek C. A. Gagliardi T. Galatyuk F. Geurts A. Gibson D. Grosnick D. S. Gunarathne Y. Guo A. Gupta W. Guryn A. I. Hamad A. Hamed A. Harlenderova J. W. Harris L. He S. Heppelmann N. Herrmann A. Hirsch L. Holub S. Horvat X. Huang B. Huang S. L. Huang H. Z. Huang T. Huang T. J. Humanic P. Huo G. Igo W. W. Jacobs A. Jentsch J. Jia K. Jiang S. Jowzaee E. G. Judd S. Kabana D. Kalinkin K. Kang D. Kapukchyan K. Kauder H. W. Ke D. Keane A. Kechechyan D. P. Kiko{\l}a C. Kim T. A. Kinghorn I. Kisel A. Kisiel S. R. Klein L. Kochenda L. K. Kosarzewski A. F. Kraishan L. Kramarik L. Krauth P. Kravtsov K. Krueger N. Kulathunga S. Kumar L. Kumar J. Kvapil J. H. Kwasizur R. Lacey J. M. Landgraf J. Lauret A. Lebedev R. Lednicky J. H. Lee X. Li C. Li W. Li Y. Li Y. Liang J. Lidrych T. Lin A. Lipiec M. A. Lisa F. Liu P. Liu H. Liu Y. Liu T. Ljubicic W. J. Llope M. Lomnitz R. S. Longacre X. Luo S. Luo G. L. Ma Y. G. Ma L. Ma R. Ma N. Magdy R. Majka D. Mallick S. Margetis C. Markert H. S. Matis O. Matonoha D. Mayes J. A. Mazer K. Meehan J. C. Mei N. G. Minaev S. Mioduszewski D. Mishra B. Mohanty M. M. Mondal I. Mooney D. A. Morozov Md. Nasim J. D. Negrete J. M. Nelson D. B. Nemes M. Nie G. Nigmatkulov T. Niida L. V. Nogach T. Nonaka S. B. Nurushev G. Odyniec A. Ogawa K. Oh S. Oh V. A. Okorokov D. Olvitt Jr. B. S. Page R. Pak Y. Panebratsev B. Pawlik H. Pei C. Perkins J. Pluta J. Porter M. Posik N. K. Pruthi M. Przybycien J. Putschke A. Quintero S. K. Radhakrishnan S. Ramachandran R. L. Ray R. Reed H. G. Ritter J. B. Roberts O. V. Rogachevskiy J. L. Romero L. Ruan J. Rusnak O. Rusnakova N. R. Sahoo P. K. Sahu S. Salur J. Sandweiss J. Schambach A. M. Schmah W. B. Schmidke N. Schmitz B. R. Schweid F. Seck J. Seger M. Sergeeva R. Seto P. Seyboth N. Shah E. Shahaliev P. V. Shanmuganathan M. Shao W. Q. Shen F. Shen S. S. Shi Q. Y. Shou E. P. Sichtermann S. Siejka R. Sikora M. Simko S. Singha N. Smirnov D. Smirnov W. Solyst P. Sorensen H. M. Spinka B. Srivastava T. D. S. Stanislaus D. J. Stewart M. Strikhanov B. Stringfellow A. A. P. Suaide T. Sugiura M. Sumbera B. Summa Y. Sun X. Sun X. M. Sun B. Surrow D. N. Svirida P. Szymanski Z. Tang A. H. Tang A. Taranenko T. Tarnowsky J. H. Thomas A. R. Timmins D. Tlusty T. Todoroki M. Tokarev C. A. Tomkiel S. Trentalange R. E. Tribble P. Tribedy S. K. Tripathy O. D. Tsai B. Tu T. Ullrich D. G. Underwood I. Upsal G. Van Buren J. Vanek A. N. Vasiliev I. Vassiliev F. Videb{\ae}k S. Vokal S. A. Voloshin A. Vossen G. Wang Y. Wang F. Wang J. C. Webb L. Wen G. D. Westfall H. Wieman S. W. Wissink R. Witt Y. Wu Z. G. Xiao G. Xie W. Xie Q. H. Xu Z. Xu J. Xu Y. F. Xu N. Xu S. Yang C. Yang Q. Yang Y. Yang Z. Ye L. Yi K. Yip I. -K. Yoo N. Yu H. Zbroszczyk W. Zha Z. Zhang L. Zhang Y. Zhang X. P. Zhang J. Zhang S. Zhang J. Zhao C. Zhong C. Zhou L. Zhou Z. Zhu X. Zhu M. Zyzak (STAR Collaboration)
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classification hep-ex nucl-ex
keywords collisionssqrtexcesscentralitycontributionshadroniclow-model
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report first measurements of $e^{+}e^{-}$ pair production in the mass region 0.4 $<M_{ee}<$ 2.6 GeV/$c^{2}$ at low transverse momentum ($p_T<$ 0.15 GeV/$c$) in non-central Au$+$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and U$+$U collisions at $\sqrt{s_{NN}}$ = 193 GeV. Significant enhancement factors, expressed as ratios of data over known hadronic contributions, are observed in the 40-80% centrality of these collisions. The excess yields peak distinctly at low-$p_T$ with a width ($\sqrt{\langle p^2_T\rangle}$) between 40 to 60 MeV/$c$. The absolute cross section of the excess depends weakly on centrality while those from a theoretical model calculation incorporating an in-medium broadened $\rho$ spectral function and radiation from a Quark Gluon Plasma or hadronic cocktail contributions increase dramatically with increasing number of participant nucleons. Model calculations of photon-photon interactions generated by the initial projectile and target nuclei describe the observed excess yields but fail to reproduce the $p^{2}_{T}$ distributions.

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