Probing parton dynamics of QCD matter with Ω and φ production

被引:53
作者
Adamczyk, L. [1 ]
Adkins, J. K. [20 ]
Agakishiev, G. [18 ]
Aggarwal, M. M. [31 ]
Ahammed, Z. [49 ]
Alekseev, I. [16 ]
Aparin, A. [18 ]
Arkhipkin, D. [3 ]
Aschenauer, E. C. [3 ]
Attri, A. [31 ]
Averichev, G. S. [18 ]
Bai, X. [7 ]
Bairathi, V. [27 ]
Bellwied, R. [45 ]
Bhasin, A. [17 ]
Bhati, A. K. [31 ]
Bhattarai, P. [44 ]
Bielcik, J. [10 ]
Bielcikova, J. [11 ]
Bland, L. C. [3 ]
Bordyuzhin, I. G. [16 ]
Bouchet, J. [19 ]
Brandenburg, J. D. [37 ]
Brandin, A. V. [26 ]
Bunzarov, I. [18 ]
Butterworth, J. [37 ]
Caines, H. [53 ]
Sanchez, M. Calderon de la Barca [5 ]
Campbell, J. M. [29 ]
Cebra, D. [5 ]
Chakaberia, I. [3 ]
Chaloupka, P. [10 ]
Chang, Z. [43 ]
Chatterjee, A. [49 ]
Chattopadhyay, S. [49 ]
Chen, J. H. [40 ]
Chen, X. [22 ]
Cheng, J. [46 ]
Cherney, M. [9 ]
Christie, W. [3 ]
Contin, G. [23 ]
Crawford, H. J. [4 ]
Das, S. [13 ]
De Silva, L. C. [9 ]
Debbe, R. R. [3 ]
Dedovich, T. G. [18 ]
Deng, J. [39 ]
Derevschikov, A. A. [33 ]
di Ruzza, B. [3 ]
Didenko, L. [3 ]
机构
[1] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland
[2] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA
[3] Brookhaven Natl Lab, Upton, NY 11973 USA
[4] Univ Calif Berkeley, Berkeley, CA 94720 USA
[5] Univ Calif Davis, Davis, CA 95616 USA
[6] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
[7] Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China
[8] Univ Illinois, Chicago, IL 60607 USA
[9] Creighton Univ, Omaha, NE 68178 USA
[10] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic
[11] Nucl Phys Inst AS CR, Prague 25068, Czech Republic
[12] Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany
[13] Inst Phys, Bhubaneswar 751005, Orissa, India
[14] Indian Inst Technol, Bombay 400076, Maharashtra, India
[15] Indiana Univ, Bloomington, IN 47408 USA
[16] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia
[17] Univ Jammu, Jammu 180001, India
[18] Joint Inst Nucl Res, Dubna 141980, Russia
[19] Kent State Univ, Kent, OH 44242 USA
[20] Univ Kentucky, Lexington, KY 40506 USA
[21] Korea Inst Sci & Technol Informat, Taejon 305701, South Korea
[22] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
[23] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[24] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[25] Michigan State Univ, E Lansing, MI 48824 USA
[26] Nat Res Nucl Univ MEPhI, Moscow 115409, Russia
[27] Nat Inst Sci Educ & Res, Bhubaneswar 751005, Orissa, India
[28] Natl Cheng Kung Univ, Tainan 70101, Taiwan
[29] Ohio State Univ, Columbus, OH 43210 USA
[30] Inst Nucl Phys PAN, PL-31342 Krakow, Poland
[31] Punjab Univ, Chandigarh 160014, India
[32] Penn State Univ, University Pk, PA 16802 USA
[33] Inst High Energy Phys, Protvino 142281, Russia
[34] Purdue Univ, W Lafayette, IN 47907 USA
[35] Pusan Natl Univ, Pusan 46241, South Korea
[36] Univ Rajasthan, Jaipur 302004, Rajasthan, India
[37] Rice Univ, Houston, TX 77251 USA
[38] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[39] Shandong Univ, Jinan 250100, Peoples R China
[40] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
[41] SUNY Stony Brook, Stony Brook, NY 11794 USA
[42] Temple Univ, Philadelphia, PA 19122 USA
[43] Texas A&M Univ, College Stn, TX 77843 USA
[44] Univ Texas Austin, Austin, TX 78712 USA
[45] Univ Houston, Houston, TX 77204 USA
[46] Tsinghua Univ, Beijing 100084, Peoples R China
[47] US Naval Acad, Annapolis, MD 21402 USA
[48] Valparaiso Univ, Valparaiso, IN 46383 USA
[49] Ctr Variable Energy Cyclotron, Kolkata 700064, India
[50] Warsaw Univ Technol, PL-00661 Warsaw, Poland
基金
美国国家科学基金会; 新加坡国家研究基金会;
关键词
MESON PRODUCTION; ENERGY; STRANGENESS; DEPENDENCE; COLLISIONS;
D O I
10.1103/PhysRevC.93.021903
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
We present measurements of Omega and phi production at midrapidity from Au+Au collisions at nucleon-nucleon center-of-mass energiesv root s(NN) = 7.7, 11.5, 19.6, 27, and 39 GeV by the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). Motivated by the coalescence formation mechanism for these strange hadrons, we study the ratios of N(Omega(-)+Omega(+))/[2N(phi)]. These ratios as a function of transverse momentum p(T) fall on a consistent trend at high collision energies, but start to show deviations in peripheral collisions at root s(NN) = 19.6, 27, and 39 GeV, and in central collisions at 11.5 GeV in the intermediate p(T) region of 2.4-3.6 GeV/c. We further evaluate empirically the strange quark p(T) distributions at hadronization by studying the Omega/phi ratios scaled by the number of constituent quarks (NCQ). The NCQ-scaled Omega/phi ratios show a suppression of strange quark production in central collisions at 11.5 GeV compared to root s(NN) >= 19.6 GeV. The shapes of the presumably thermal strange quark distributions in 0-60% most central collisions at 7.7 GeV show significant deviations from those in 0-10% most central collisions at higher energies. These features suggest that there is likely a change of the underlying strange quark dynamics in the transition from quark matter to hadronic matter at collision energies below 19.6 GeV.
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页数:6
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