/ hep-ex arXiv:1504.01317


Measurements of Dielectron Production in Au$+$Au Collisions at $\sqrt{s_{\rm NN}}$ = 200 GeV from the STAR Experiment


Adamczyk, L. (AGH-UST, Cracow) ; Adkins, J.K. (Kentucky U.) ; Agakishiev, G. (Dubna, JINR) ; Aggarwal, M.M. (Panjab U.) ; Ahammed, Z. (Calcutta, VECC) ; Alekseev, I. (Moscow, ITEP) ; Alford, J. (Kent State U.) ; Aparin, A. (Dubna, JINR) ; Arkhipkin, D. (Brookhaven) ; Aschenauer, E.C. (Brookhaven) ; Averichev, G.S. (Dubna, JINR) ; Banerjee, A. (Calcutta, VECC) ; Bellwied, R. (Houston U.) ; Bhasin, A. (Jammu U.) ; Bhati, A.K. (Panjab U.) ; Bhattarai, P. (Texas U.) ; Bielcik, J. (Prague, Tech. U.) ; Bielcikova, J. (Rez, Nucl. Phys. Inst.) ; Bland, L.C. (Brookhaven) ; Bordyuzhin, I.G. (Moscow, ITEP) ; Bouchet, J. (Kent State U.) ; Brandin, A.V. (Moscow Phys. Eng. Inst.) ; Bunzarov, I. (Dubna, JINR) ; Burton, T.P. (Brookhaven) ; Butterworth, J. (Rice U.) ; Caines, H. (Yale U.) ; Calderon de la Barca Sanchez, M. (UC, Davis) ; Campbell, J.M. (Ohio State U.) ; Cebra, D. (UC, Davis) ; Cervantes, M.C. (Texas A-M) ; Chakaberia, I. (Brookhaven) ; Chaloupka, P. (Prague, Tech. U.) ; Chang, Z. (Texas A-M) ; Chattopadhyay, S. (Calcutta, VECC) ; Chen, J.H. (SINAP, Shanghai) ; Chen, X. (Lanzhou, Inst. Modern Phys.) ; Cheng, J. (Tsinghua U., Beijing) ; Cherney, M. (Creighton U.) ; Christie, W. (Brookhaven) ; Contin, G. (LBL, Berkeley) ; Crawford, H.J. (UC, Berkeley) ; Das, S. (Bhubaneswar, Inst. Phys.) ; De Silva, L.C. (Creighton U.) ; Debbe, R.R. (Brookhaven) ; Dedovich, T.G. (Dubna, JINR) ; Deng, J. (Shandong U.) ; Derevschikov, A.A. (Serpukhov, IHEP) ; di Ruzza, B. (Brookhaven) ; Didenko, L. (Brookhaven) ; Dilks, C. (Penn State U.) ; Dong, X. (LBL, Berkeley) ; Drachenberg, J.L. (Valparaiso U., Indiana) ; Draper, J.E. (UC, Davis) ; Du, C.M. (Lanzhou, Inst. Modern Phys.) ; Dunkelberger, L.E. (UCLA) ; Dunlop, J.C. (Brookhaven) ; Efimov, L.G. (Dubna, JINR) ; Engelage, J. (UC, Berkeley) ; Eppley, G. (Rice U.) ; Esha, R. (UCLA) ; Evdokimov, O. (Illinois U., Chicago) ; Eyser, O. (Brookhaven) ; Fatemi, R. (Kentucky U.) ; Fazio, S. (Brookhaven) ; Federic, P. (Rez, Nucl. Phys. Inst.) ; Fedorisin, J. (Dubna, JINR) ; Feng, Z. (Hua-Zhong Normal U.) ; Filip, P. (Dubna, JINR) ; Fisyak, Y. (Brookhaven) ; Flores, C.E. (UC, Davis) ; Fulek, L. (AGH-UST, Cracow) ; Gagliardi, C.A. (Texas A-M) ; Garand, D. (Purdue U.) ; Geurts, F. (Rice U.) ; Gibson, A. (Valparaiso U., Indiana) ; Girard, M. (Warsaw U. of Tech.) ; Greiner, L. (LBL, Berkeley) ; Grosnick, D. (Valparaiso U., Indiana) ; Gunarathne, D.S. (Temple U.) ; Guo, Y. (Hefei, CUST) ; Gupta, S. (Jammu U.) ; Gupta, A. (Jammu U.) ; Guryn, W. (Brookhaven) ; Hamad, A. (Kent State U.) ; Hamed, A. (Texas A-M) ; Haque, R. (Bhubaneswar, NISER) ; Harris, J.W. (Yale U.) ; He, L. (Purdue U.) ; Heppelmann, S. (Penn State U.) ; Heppelmann, S. (Brookhaven) ; Hirsch, A. (Purdue U.) ; Hoffmann, G.W. (Texas U.) ; Hofman, D.J. (Illinois U., Chicago) ; Horvat, S. (Yale U.) ; Huang, B. (Illinois U., Chicago) ; Huang, X. (Tsinghua U., Beijing) ; Huang, H.Z. (UCLA) ; Huck, P. (Hua-Zhong Normal U.) ; Humanic, T.J. (Ohio State U.) ; Igo, G. (UCLA) ; Jacobs, W.W. (Indiana U.) ; Jang, H. (KAIST, Taejon) ; Jiang, K. (Hefei, CUST) ; Judd, E.G. (UC, Berkeley) ; Kabana, S. (Kent State U.) ; Kalinkin, D. (Moscow, ITEP) ; Kang, K. (Tsinghua U., Beijing) ; Kauder, K. (Wayne State U.) ; Ke, H.W. (Brookhaven) ; Keane, D. (Kent State U.) ; Kechechyan, A. (Dubna, JINR) ; Khan, Z.H. (Illinois U., Chicago) ; Kikola, D.P. (Warsaw U. of Tech.) ; Kisel, I. (Frankfurt U., FIAS) ; Kisiel, A. (Warsaw U. of Tech.) ; Kochenda, L. (Moscow Phys. Eng. Inst.) ; Koetke, D.D. (Valparaiso U., Indiana) ; Kollegger, T. (Frankfurt U., FIAS) ; Kosarzewski, L.K. (Warsaw U. of Tech.) ; Kraishan, A.F. (Temple U.) ; Kravtsov, P. (Moscow Phys. Eng. Inst.) ; Krueger, K. (Argonne) ; Kulakov, I. (Frankfurt U., FIAS) ; Kumar, L. (Panjab U.) ; Kycia, R.A. (Cracow, INP) ; Lamont, M.A.C. (Brookhaven) ; Landgraf, J.M. (Brookhaven) ; Landry, K.D. (UCLA) ; Lauret, J. (Brookhaven) ; Lebedev, A. (Brookhaven) ; Lednicky, R. (Dubna, JINR) ; Lee, J.H. (Brookhaven) ; Li, X. (Brookhaven) ; Li, C. (Hefei, CUST) ; Li, W. (SINAP, Shanghai) ; Li, Z.M. (Hua-Zhong Normal U.) ; Li, Y. (Tsinghua U., Beijing) ; Li, X. (Temple U.) ; Lisa, M.A. (Ohio State U.) ; Liu, F. (Hua-Zhong Normal U.) ; Ljubicic, T. (Brookhaven) ; Llope, W.J. (Wayne State U.) ; Lomnitz, M. (Kent State U.) ; Longacre, R.S. (Brookhaven) ; Luo, X. (Hua-Zhong Normal U.) ; Ma, Y.G. (SINAP, Shanghai) ; Ma, G.L. (SINAP, Shanghai) ; Ma, L. (SINAP, Shanghai) ; Ma, R. (Brookhaven) ; Magdy, N. (WLCAPP, Cairo) ; Majka, R. (Yale U.) ; Manion, A. (LBL, Berkeley) ; Margetis, S. (Kent State U.) ; Markert, C. (Texas U.) ; Masui, H. (LBL, Berkeley) ; Matis, H.S. (LBL, Berkeley) ; McDonald, D. (Houston U.) ; Meehan, K. (UC, Davis) ; Minaev, N.G. (Serpukhov, IHEP) ; Mioduszewski, S. (Texas A-M) ; Mohanty, B. (Bhubaneswar, NISER) ; Mondal, M.M. (Texas A-M) ; Morozov, D. (Serpukhov, IHEP) ; Mustafa, M.K. (LBL, Berkeley) ; Nandi, B.K. (Indian Inst. Tech., Mumbai) ; Nasim, Md. (UCLA) ; Nayak, T.K. (Calcutta, VECC) ; Nigmatkulov, G. (Moscow Phys. Eng. Inst.) ; Nogach, L.V. (Serpukhov, IHEP) ; Noh, S.Y. (KAIST, Taejon) ; Novak, J. (Michigan State U.) ; Nurushev, S.B. (Serpukhov, IHEP) ; Odyniec, G. (LBL, Berkeley) ; Ogawa, A. (Brookhaven) ; Oh, K. (Pusan Natl. U.) ; Okorokov, V. (Moscow Phys. Eng. Inst.) ; Olvitt, D., Jr. (Temple U.) ; Page, B.S. (Brookhaven) ; Pak, R. (Brookhaven) ; Pan, Y.X. (UCLA) ; Pandit, Y. (Illinois U., Chicago) ; Panebratsev, Y. (Dubna, JINR) ; Pawlik, B. (Cracow, INP) ; Pei, H. (Hua-Zhong Normal U.) ; Perkins, C. (UC, Berkeley) ; Peterson, A. (Ohio State U.) ; Pile, P. (Brookhaven) ; Planinic, M. (Zagreb U., Phys. Dept.) ; Pluta, J. (Warsaw U. of Tech.) ; Poljak, N. (Zagreb U., Phys. Dept.) ; Poniatowska, K. (Warsaw U. of Tech.) ; Porter, J. (LBL, Berkeley) ; Posik, M. (Temple U.) ; Poskanzer, A.M. (LBL, Berkeley) ; Pruthi, N.K. (Panjab U.) ; Putschke, J. (Wayne State U.) ; Qiu, H. (LBL, Berkeley) ; Quintero, A. (Kent State U.) ; Ramachandran, S. (Kentucky U.) ; Raniwala, R. (Rajasthan U.) ; Raniwala, S. (Rajasthan U.) ; Ray, R.L. (Texas U.) ; Ritter, H.G. (LBL, Berkeley) ; Roberts, J.B. (Rice U.) ; Rogachevskiy, O.V. (Dubna, JINR) ; Romero, J.L. (UC, Davis) ; Roy, A. (Calcutta, VECC) ; Ruan, L. (Brookhaven) ; Rusnak, J. (Rez, Nucl. Phys. Inst.) ; Rusnakova, O. (Prague, Tech. U.) ; Sahoo, N.R. (Texas A-M) ; Sahu, P.K. (Bhubaneswar, Inst. Phys.) ; Sakrejda, I. (LBL, Berkeley) ; Salur, S. (LBL, Berkeley) ; Sandweiss, J. (Yale U.) ; Sarkar, A. (Indian Inst. Tech., Mumbai) ; Schambach, J. (Texas U.) ; Scharenberg, R.P. (Purdue U.) ; Schmah, A.M. (LBL, Berkeley) ; Schmidke, W.B. (Brookhaven) ; Schmitz, N. (Munich, Max Planck Inst.) ; Seger, J. (Creighton U.) ; Seyboth, P. (Munich, Max Planck Inst.) ; Shah, N. (SINAP, Shanghai) ; Shahaliev, E. (Dubna, JINR) ; Shanmuganathan, P.V. (Kent State U.) ; Shao, M. (Hefei, CUST) ; Sharma, M.K. (Jammu U.) ; Sharma, B. (Panjab U.) ; Shen, W.Q. (SINAP, Shanghai) ; Shi, S.S. (Hua-Zhong Normal U.) ; Shou, Q.Y. (SINAP, Shanghai) ; Sichtermann, E.P. (LBL, Berkeley) ; Sikora, R. (AGH-UST, Cracow) ; Simko, M. (Rez, Nucl. Phys. Inst.) ; Skoby, M.J. (Indiana U.) ; Smirnov, D. (Brookhaven) ; Smirnov, N. (Yale U.) ; Song, L. (Houston U.) ; Sorensen, P. (Brookhaven) ; Spinka, H.M. (Argonne) ; Srivastava, B. (Purdue U.) ; Stanislaus, T.D.S. (Valparaiso U., Indiana) ; Stepanov, M. (Purdue U.) ; Stock, R. (Frankfurt U., FIAS) ; Strikhanov, M. (Moscow Phys. Eng. Inst.) ; Stringfellow, B. (Purdue U.) ; Sumbera, M. (Rez, Nucl. Phys. Inst.) ; Summa, B. (Penn State U.) ; Sun, X. (LBL, Berkeley) ; Sun, Z. (Lanzhou, Inst. Modern Phys.) ; Sun, X.M. (Hua-Zhong Normal U.) ; Sun, Y. (Hefei, CUST) ; Surrow, B. (Temple U.) ; Svirida, N. (Moscow, ITEP) ; Szelezniak, M.A. (LBL, Berkeley) ; Tang, A.H. (Brookhaven) ; Tang, Z. (Hefei, CUST) ; Tarnowsky, T. (Michigan State U.) ; Tawfik, A.N. (WLCAPP, Cairo) ; Thomas, J.H. (LBL, Berkeley) ; Timmins, A.R. (Houston U.) ; Tlusty, D. (Rez, Nucl. Phys. Inst.) ; Tokarev, M. (Dubna, JINR) ; Trentalange, S. (UCLA) ; Tribble, R.E. (Texas A-M) ; Tribedy, P. (Calcutta, VECC) ; Tripathy, S.K. (Bhubaneswar, Inst. Phys.) ; Trzeciak, B.A. (Prague, Tech. U.) ; Tsai, O.D. (UCLA) ; Ullrich, T. (Brookhaven) ; Underwood, D.G. (Argonne) ; Upsal, I. (Ohio State U.) ; Van Buren, G. (Brookhaven) ; van Nieuwenhuizen, G. (Brookhaven) ; Vandenbroucke, M. (Temple U.) ; Varma, R. (Indian Inst. Tech., Mumbai) ; Vasiliev, A.N. (Serpukhov, IHEP) ; Vertesi, R. (Rez, Nucl. Phys. Inst.) ; Videbaek, F. (Brookhaven) ; Viyogi, Y.P. (Calcutta, VECC) ; Vokal, S. (Dubna, JINR) ; Voloshin, S.A. (Wayne State U.) ; Vossen, A. (Indiana U.) ; Wang, G. (UCLA) ; Wang, Y. (Hua-Zhong Normal U.) ; Wang, F. (Purdue U.) ; Wang, Y. (Tsinghua U., Beijing) ; Wang, H. (Brookhaven) ; Wang, J.S. (Lanzhou, Inst. Modern Phys.) ; Webb, J.C. (Brookhaven) ; Webb, G. (Brookhaven) ; Wen, L. (UCLA) ; Westfall, G.D. (Michigan State U.) ; Wieman, H. (LBL, Berkeley) ; Wissink, S.W. (Indiana U.) ; Witt, R. (Naval Academy, Annapolis) ; Wu, Y.F. (Hua-Zhong Normal U.) ; Xiao, Z.G. (Tsinghua U., Beijing) ; Xie, W. (Purdue U.) ; Xin, K. (Rice U.) ; Xu, Q.H. (Shandong U.) ; Xu, Z. (Brookhaven) ; Xu, H. (Lanzhou, Inst. Modern Phys.) ; Xu, N. (LBL, Berkeley) ; Xu, Y.F. (SINAP, Shanghai) ; Yang, Q. (Hefei, CUST) ; Yang, Y. (Lanzhou, Inst. Modern Phys.) ; Yang, S. (Hefei, CUST) ; Yang, Y. (Hua-Zhong Normal U.) ; Yang, C. (Hefei, CUST) ; Ye, Z. (Illinois U., Chicago) ; Yepes, P. (Rice U.) ; Yi, L. (Purdue U.) ; Yip, K. (Brookhaven) ; Yoo, I.K. (Pusan Natl. U.) ; Yu, N. (Hua-Zhong Normal U.) ; Zbroszczyk, H. (Warsaw U. of Tech.) ; Zha, W. (Hefei, CUST) ; Zhang, X.P. (Tsinghua U., Beijing) ; Zhang, J. (Shandong U.) ; Zhang, Y. (Hefei, CUST) ; Zhang, J. (Lanzhou, Inst. Modern Phys.) ; Zhang, J.B. (Hua-Zhong Normal U.) ; Zhang, S. (SINAP, Shanghai) ; Zhang, Z. (SINAP, Shanghai) ; Zhao, J. (Hua-Zhong Normal U.) ; Zhong, C. (SINAP, Shanghai) ; Zhou, L. (Hefei, CUST) ; Zhu, X. (Tsinghua U., Beijing) ; Zoulkarneeva, Y. (Dubna, JINR) ; Zyzak, M. (Frankfurt U., FIAS)

Pages: 40

Abstract: We report on measurements of dielectron ($e^+e^-$) production in Au$+$Au collisions at a center-of-mass energy of 200 GeV per nucleon-nucleon pair using the STAR detector at RHIC. Systematic measurements of the dielectron yield as a function of transverse momentum ($p_{\rm T}$) and collision centrality show an enhancement compared to a cocktail simulation of hadronic sources in the low invariant-mass region ($M_{ee}<$ 1 GeV/$c^2$). This enhancement cannot be reproduced by the $\rho$-meson vacuum spectral function. In minimum-bias collisions, in the invariant-mass range of 0.30 $-$ 0.76 GeV/$c^2$, integrated over the full $p_{\rm T}$ acceptance, the enhancement factor is 1.76 $\pm$ 0.06 (stat.) $\pm$ 0.26 (sys.) $\pm$ 0.29 (cocktail). The enhancement factor exhibits weak centrality and $p_{\rm T}$ dependence in STAR's accessible kinematic regions, while the excess yield in this invariant-mass region as a function of the number of participating nucleons follows a power-law shape with a power of 1.44 $\pm$ 0.10. Models that assume an in-medium broadening of the $\rho$ meson spectral function consistently describe the observed excess in these measurements. Additionally, we report on measurements of $\omega$ and $\phi$-meson production through their $e^+e^-$ decay channel. These measurements show good agreement with Tsallis Blast-Wave model predictions as well as, in the case of the $\phi$-meson, results through its $K^+K^-$ decay channel. In the intermediate invariant-mass region (1.1$<M_{ee}<$ 3 GeV/$c^2$), we investigate the spectral shapes from different collision centralities. Physics implications for possible in-medium modification of charmed hadron production and other physics sources are discussed.

Web-Page: http://inspirehep.net/record/1357992/files/raw_masspt_PRC.png; http://inspirehep.net/record/1357992/files/MinBias_pT.png; http://inspirehep.net/record/1357992/files/figure2.png; http://inspirehep.net/record/1357992/files/paper_Acc.png; http://inspirehep.net/record/1357992/files/Hnelectrons.png; http://inspirehep.net/record/1357992/files/Phi_FitRawYield.png; http://inspirehep.net/record/1357992/files/paper_phiAcc_star.png; http://inspirehep.net/record/1357992/files/comp_pp_allphxFilter.png; http://inspirehep.net/record/1357992/files/paper_phiAcc_phenixV.png; http://inspirehep.net/record/1357992/files/omega_FitRawYield.png; http://inspirehep.net/record/1357992/files/sigma.png; http://inspirehep.net/record/1357992/files/mT_charm.png; http://inspirehep.net/record/1357992/files/minbias_hadron.png; http://inspirehep.net/record/1357992/files/efficiency.png; http://inspirehep.net/record/1357992/files/mass2.png; http://inspirehep.net/record/1357992/files/paper_Acc_phenix.png; http://inspirehep.net/record/1357992/files/gamma_pic.png; http://inspirehep.net/record/1357992/files/omega_rho_PRC.png; http://inspirehep.net/record/1357992/files/paper_ratio.png; http://inspirehep.net/record/1357992/files/omega_Mass_Width_sys.png; http://inspirehep.net/record/1357992/files/Phi_Mass_Width_sys.png; http://inspirehep.net/record/1357992/files/minbias_sys.png; http://inspirehep.net/record/1357992/files/paper_4bg.png; http://inspirehep.net/record/1357992/files/PhiAllPt.png; http://inspirehep.net/record/1357992/files/spectra_pt_yshift_final.png; http://inspirehep.net/record/1357992/files/Final_eff.png; http://inspirehep.net/record/1357992/files/paper_nRegion.png; http://inspirehep.net/record/1357992/files/Purity.png; http://inspirehep.net/record/1357992/files/phenix_paper_4bg.png; http://inspirehep.net/record/1357992/files/Final_single.png; http://inspirehep.net/record/1357992/files/OmeAllPt.png; http://inspirehep.net/record/1357992/files/Hept.png; http://inspirehep.net/record/1357992/files/nPsi.png; http://inspirehep.net/record/1357992/files/comp_pp_partphxFilter.png; http://inspirehep.net/record/1357992/files/200mb_excess_PRC.png; http://inspirehep.net/record/1357992/files/charmM_comSTAR.png; http://inspirehep.net/record/1357992/files/nMix_star_mb.png; http://inspirehep.net/record/1357992/files/ratio2.png; http://inspirehep.net/record/1357992/files/effvspT.png; http://inspirehep.net/record/1357992/files/paper_RefMult.png; http://inspirehep.net/record/1357992/files/phenix_ratio2.png; http://inspirehep.net/record/1357992/files/effpt_com.png; http://inspirehep.net/record/1357992/files/centrality_Acc.png; http://inspirehep.net/record/1357992/files/paper_bgsb.png; http://inspirehep.net/record/1357992/files/AuAu200_inputpT.png; http://inspirehep.net/record/1357992/files/paper_PID_logx_PRC.png; http://inspirehep.net/record/1357992/files/corrYieldmb_Full_the.png; http://inspirehep.net/record/1357992/files/Centrality_enhance.png; http://inspirehep.net/record/1357992/files/paper_PIDFit.png; http://inspirehep.net/record/1357992/files/pt_enhance.png; http://inspirehep.net/record/1357992/files/corrYieldmb_PHSD_Full.png; http://inspirehep.net/record/1357992/files/pic_phiV.png; http://inspirehep.net/record/1357992/files/corrYieldmb_phenix_Full_the.png; http://inspirehep.net/record/1357992/files/ee200Rcp.png; http://inspirehep.net/record/1357992/files/with_rho2.png; http://inspirehep.net/record/1357992/files/corrYieldmb_Full.png; http://inspirehep.net/record/1357992/files/with_rho.png; http://inspirehep.net/record/1357992/files/centrality_bg.png; http://inspirehep.net/record/1357992/files/corrYieldmb_phenix_Full.png; http://inspirehep.net/record/1357992/files/pt_Acc.png; http://inspirehep.net/record/1357992/files/pt_bg.png; http://inspirehep.net/record/1357992/files/Centrality_mass.png; http://inspirehep.net/record/1357992/files/arXiv:1504.01317.pdf


Note: *Temporary entry*; 40 pages, 49 figures

Total numbers of views: 1401
Numbers of unique views: 625
 Record created 2015-05-05, last modified 2015-05-05


External links:
Download fulltextFulltext
Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)