Measurements of Dielectron Production in Au$+$Au Collisions at $\sqrt{s_{NN}}$= 27, 39, and 62.4 GeV from the STAR Experiment

Adam, J.; Adamczyk, L.; Adams, J. R.; Adkins, J. K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Anderson, D.; Aoyama, R.; Aparin, A.; Arkhipkin, D.; Aschenauer, E. C.; Ashraf, M. U.; Atetalla, F. G.; Attri, A.; Averichev, G. S.; Bai, X. H.; Bairathi, V.; Barish, K. N.; Bassill, A. J.; Behera, A.; Bellwied, R.; Bhasin, A.; Bhati, A. K.; Bielčík, J.; Bielčíková, J.; Bland, L. C.; Bordyuzhin, I. G.; Brandenburg, J. D.; Brandin, A. V.; Brown, D. N.; Bryslawskyj, J.; Bunzarov, I.; Butterworth, J. M.; Caines, H.; Sánchez, M. Calderón De La Barca; Cebra, D.; Chakaberia, I.; Chaloupka, P.; Chan, B. K.; Chang, F-H.; Chang, Zhe; Chankova-Bunzarova, N.; Chatterjee, A.; Chattopadhyay, S.; Chen, J. H.; Chen, X.; Cheng, Jie; Cherney, M.; Christie, W.; Contin, G.; Crawford, H. J.; Csanád, M.; Das, S.; Dedovich, T. G.; Deppner, I. M.; Derevschikov, A. A.; Didenko, L.; Dilks, C.; Dong, X.; Drachenberg, J. L.; Dunlop, J. C.; Edmonds, T.; Efimov, L. G.; Elsey, N.; Engelage, J.; Eppley, G.; Esha, R.; Esumi, S.; Evdokimov, O.; Ewigleben, J.; Eyser, O.; Fatemi, R.; Fazio, S.; Federic, P.; Fedorišin, J.; Filip, P.; Finch, E.; Fisyak, Y.; Flores, C.; Fulek, Ł.; Gagliardi, C. A.; Galatyuk, T.; Geurts, F. J. M.; Gibson, A.; Grosnick, D.; Gunarathne, D. S.; Guo, Y. P.; Gupta, A.; Guryn, W.; Hamad, A. I.; Hamed, Ahmed M.; Harlenderova, A.; Harris, J. W.; He, Li-Ping; Heppelmann, S.; Herrmann, N.; Hirsch, A.; Holub, L.; Ye, Hong; Horvat, S.; Huang, B.; Huang, H. Z.; Huang, S.; Huang, Tuchen; Huang, X.; Humanic, T. J.; Huo, P.; Igo, G.; Jacobs, W. W.; Jentsch, A.; Jia, Jinping; Jiang, K.; Jowzaee, S.; Ju, X.; Judd, E. G.; Kabana, S.; Kagamaster, S.; Kalinkin, D.; Kang, K.; Kapukchyan, D.; Kauder, K.; Ke, H. W.; Keane, D.; Kechechyan, A.; Kelsey, M.H.; Kikoła, D. P.; Kim, C.; Kinghorn, T. A.; Kisel, I.; Kisiel, A.; Kocan, M.; Kochenda, L.; Kosarzewski, L. K.; Kraishan, A. F.; Kramárik, L.; Krauth, L.; Кравцов, П.; Krueger, K.; Kulathunga, N.; Kumar, L.; Elayavalli, Raghav Kunnawalkam; Kvapil, J.; Kwasizur, J. H.; Lacey, R.; Landgraf, J. M.; Lauret, J.; Lebedev, A.; Lednický, R.; Lee, J. H.; Li, C.; Li, W.; Li, X.; Li, Y.; Liang, Y.; Licenik, R.; Lidrych, J.; Lin, T. F.; Lipiec, A.; Lisa, M. A.; Liu, F.; Liu, H.; Liu, P.; Liu, X.; Liu, Y.; Liu, Z.; Ljubičić, T.; Llope, W. J.; Lomnitz, M.; Longacre, R. S.; Luo, S.; Luo, Xuan; L., G.; Ma, L.; Ma, R.; G., Y.; Magdy, Niseem; Majka, R.; Mallick, D.; Margetis, S.; Markert, C.; Matis, H. S.; Matonoha, O.; Mazer, J.; Meehan, K.; Mei, J. C.; Minaev, N. G.; Mioduszewski, S.; Mishra, D.; Mohanty, B.; Mondal, M. M.; Mooney, I.; Moravcová, Z.; Морозов, Д. А.; Nasim, Md.; Nayak, K.; Negrete, J. D.; Nelson, J. M.; Nemes, D. B.; Nie, M.; Nigmatkulov, G.; Niida, T.; Nogach, L. V.; Nonaka, Toshihiko; Odyniec, G.; Ogawa, A.; Oh, K.; Oh, S. H.; Okorokov, V.; Olvitt, D.; Page, B. S.; Pak, R.; Panebratsev, Y.; Pawlik, B.; Pei, H.; Perkins, C.; Pintér, R. L.; Pluta, J.; Porter, J.; Posik, M.; Pruthi, N. K.; Przybycień, M.; Putschke, J.; Quintero, A.; Radhakrishnan, S. K.; Ray, R. L.; Reed, R. G.; Ritter, H. G.; Roberts, J.; Rogachevskiy, O. V.; Romero, J. L.; Ruan, L.; Rusňák, J.; Rusnakova, O.; Sahoo, N.; Sahu, P. K.; Salur, S.; Sandweiss, J.; Schambach, Johann Joachim; Schmah, A. M.; Schmidke, W. B.; Schmitz, N.; Schweid, B. R.; Seck, F.; Seger, J.; Sergeeva, M.; Seto, R.; Seyboth, P.; Shah, N.; Shahaliev, E.; Shanmuganathan, P. V.; Shao, M.; Shen, F.; Shen, W. Q.; Shi, S. S.; Shou, Q. Y.; Sichtermann, E. P.; Siejka, S.; Sikora, R.; Simko, M.; Singh, J. B.; Singha, S.; Smirnov, D.; Смирнов, Н. Н.; Solyst, W.; Sorensen, P.; Spinka, H. M.; Srivastava, B.; Stanislaus, T. D. S.; Stewart, D. J.; Strikhanov, M.; Stringfellow, B.; Suaide, A. A. P.; Sugiura, T.; Šumbera, M.; Summa, B.; Sun, X.; Sun, Y.; Surrow, B.; Svirida, D. N.; Szymański, P.; Tang, A. H.; Tang, Z.; Taranenko, A.; Tarnowsky, T.; Thomas, J. H.; Timmins, A. R.; Tlusty, D.; Todoroki, T.; Tokarev, M.; Tomkiel, C. A.; Trentalange, S.; Tribble, R. E.; Tribedy, P.; Tripathy, S. K.; Tsai, O. D.; Tu, B.; Ullrich, T.; Underwood, D. G.; Upsal, I.; Buren, G. Van; Vaněk, J.; Vasiliev, A.; Vassiliev, I.; Videbæk, F.; Vokál, S.; Voloshin, S. A.; Vossen, A.; Wang, F.; Wang, G.; Wang, P.; Wang, Y.; Webb, J. C.; Wen, L.; Westfall, G. D.; Wieman, H.; Wissink, S. W.; Witt, R.; Wu, Y.; Xiao, Zhiguang; Xie, Guoqiang; Xie, W.; Xu, J.; Xu, N.; Xu, Qingnian; Xu, Y.; Xu, Z.; Yang, C.; Yang, Qiang; Yang, S.; Yang, You-Chang; Ye, Z.; Yi, L.; Yip, K.; Yoo, I. K.; Zbroszczyk, H.; Zha, W.; Zhang, D.; Zhang, J.; Zhang, L.; Zhang, S.; Zhang, X. P.; Zhang, Y.; Zhang, Z.; Zhao, J. Y.; Zhong, C.; Zhou, C. L.; Zhu, X.; Zhu, Zhichao; Żurek, M.; Zyzak, M.

doi:10.48550/arxiv.1810.10159

Cited by 4 publications

(6 citation statements)

References 14 publications

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“…At low lepton pair transverse momentum(q ⊥ ), the dominant production mechanism is the photon-photon fusion process(γγ → l + l − ) which is greatly enhanced due to the large flux of quasi-real photons coherently generated by a fast moving nucleus. The measurements carried out at SPS, RHIC and LHC [1][2][3][4][5][6][7] have clearly demonstrated that dilepton production is indeed peaked at very low transverse momentum. The comprehensive understanding of such process is not only important for accurate background estimates in heavy ion collisions, but also interesting from a pure theoretical point of view.…”

Section: Introductionmentioning

confidence: 98%

Impact parameter dependence of the azimuthal asymmetry in lepton pair production in heavy ion collisions

Liu

Zhou

2020

Phys. Rev. D

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show abstract

Section: Introductionmentioning

confidence: 98%

Impact parameter dependence of the azimuthal asymmetry in lepton pair production in heavy ion collisions

Liu

Zhou

2020

Phys. Rev. D

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“…A systematic beam-energy scan study (BES) by the STAR collaboration of the production of dielectrons in the lowmass range [283] has recently been augmented by two high-statistics data samples at √ s NN = 27 GeV and 54.4 GeV [281,284]. As shown in the left panel of Fig.…”

Section: Recent Experimental Resultsmentioning

confidence: 99%

“…8.5 shows a compilation of experimental results on the integrated LMR dilepton excess radiation for different beam energies. These results were obtained by the HADES collaboration [242], the NA60 collaboration [14,15], and the STAR collaboration [244]. All shown data points are acceptance-corrected and represent the excess radiation as obtained by subtracting cocktail contributions excluding the ρ-meson (since its contributions are expected to be strongly modified by the medium) from the dielectron yields.…”

Section: Dileptons As a Thermometer And Chronometermentioning

confidence: 98%

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Electromagnetic Probes: Theory and Experiment

Tripolt¹,

Geurts²

2022

Preprint

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We review the current state of research on electromagnetic probes in the context of heavy-ion collisions. The focus is on thermal photons and dileptons which provide unique insights into the properties of the created hot and dense matter.This review is intended to provide an introductory overview of the topic as well as a discussion of recent theoretical and experimental results. In particular, we discuss the role of vector-meson spectral functions in the calculation of photon and dilepton rates and present recent results obtained from different frameworks. Furthermore, we will highlight the special role of photons and dileptons to provide information on observables such as the temperature, the lifetime, the polarization and the electrical conductivity of the produced medium as well as their use to learn about chiral symmetry restoration and phase transitions.

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“…Here, we will concentrate specifically on the dilepton emission. Recently, several measurements of the dilepton production were reported by both RHIC and LHC [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Rate and ellipticity of dilepton production in a magnetized quark-gluon plasma

Wang¹,

Shovkovy²

2022

Preprint

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Using the Landau-level representation for the imaginary part of the photon polarization tensor, we derive an explicit expression for the dilepton production rate from a hot quark-gluon plasma in a quantizing background magnetic field. We study in detail the dependence of the production rate on the dilepton invariant mass and the transverse momentum at mid-rapidity. We also investigate the angular dependence and ellipticity of dilepton emission. By comparing the result with the zero-field Born approximation, we find that the magnetic field leads to a strong enhancement of the dilepton rate at small values of the invariant mass (M |eB|). In the same kinematic region, the dilepton production is characterized by a sizable ellipticity. At large values of the dilepton invariant mass (M |eB|), the role of the magnetic fields decreases and the result approaches the isotropic zero-field Born rate. By investigating the dependence of ellipticity on the transverse momentum, we argue that the future measurements of dilepton rate in the region of small invariant masses can constrain the magnetic field produced in heavy-ion collisions.

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Measurements of Dielectron Production in Au$+$Au Collisions at $\sqrt{s_{NN}}$= 27, 39, and 62.4 GeV from the STAR Experiment

Cited by 4 publications

References 14 publications

Impact parameter dependence of the azimuthal asymmetry in lepton pair production in heavy ion collisions

Impact parameter dependence of the azimuthal asymmetry in lepton pair production in heavy ion collisions

Electromagnetic Probes: Theory and Experiment

Rate and ellipticity of dilepton production in a magnetized quark-gluon plasma

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