Bulk properties of the system formed in Au+Au collisions at sNN =14.5 GeV at the BNL STAR detector

Jaroslav Adam,L. Adamczyk,J. R. Adams,J. K. Adkins,G. Agakishiev,Madan M. Aggarwal,Zubayer Ahammed,I. G. Alekseev,Derek Anderson,A. Aparin,E. C. Aschenauer,Muhammad Usman Ashraf,F. G. Atetalla, A. Attri,G. S. Averichev,Vipul Bairathi,K. N. Barish,Arabinda Behera,Rene Bellwied,Anju Bhasin,Jaroslav Bielcik,Jana Bielcikova,L. C. Bland,I. G. Bordyuzhin,J. D. Brandenburg,A. V. Brandin,J. M. Butterworth, H. Caines,M. Calderon De La Barca Sanchez,D. Cebra,Irakli Chakaberia,P. Chaloupka,B. K. Chan,F-H. Chang,Z. Chang,N. Chankova-Bunzarova,Avishek Chatterjee,D. Chen, J. H. Chen, X. C. Chen,Zhenyu Chen,J. Cheng,M. Cherney,M. Chevalier,Somnath Choudhury,W. Christie,H. J. Crawford,Mate Csanad,M. S. Daugherity,T. G. Dedovich,I. M. Deppner,A. A. Derevschikov,L. Didenko,X. Dong,J. L. Drachenberg,J. C. Dunlop,T. Edmonds, N. Elsey,J. Engelage,G. Eppley,Roli Esha,S. Esumi,Olga Evdokimov, Justin Ewigleben,O. Eyser, R. Fatemi,S. Fazio,P. Federic, J. Fedorisin,C. J. Feng,Yicheng Feng,P. Filip,E. Finch,Y. Fisyak,Audrey Francisco,L. Fulek,C. A. Gagliardi,T. Galatyuk,Frank Jm Geurts,A. Gibson,K. Gopal,D. Grosnick,W. Guryn, A. I. Hamad,A. Hamed,J. W. Harris,S. He,W. He,X. H. He,S. Heppelmann,N. Herrmann,E. Hoffman,Lukas Holub,Y. Hong,S. Horvat, Y. Hu,H. Z. Huang,Shengli Huang,T. Huang,X. Huang

Physical Review C（2020）

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摘要

We report systematic measurements of bulk properties of the system created in Au+Au collisions at sNN=14.5 GeV recorded by the STAR detector at the Relativistic Heavy Ion Collider (RHIC). The transverse momentum spectra of π±, K±, and p(p¯) are studied at midrapidity (|y|<0.1) for nine centrality intervals. The centrality, transverse momentum (pT), and pseudorapidity (η) dependence of inclusive charged particle elliptic flow (v2), and rapidity-odd charged particles directed flow (v1) results near midrapidity are also presented. These measurements are compared with the published results from Au+Au collisions at other energies, and from Pb+Pb collisions at sNN=2.76 TeV. The results at sNN=14.5 GeV show similar behavior as established at other energies and fit well in the energy dependence trend. These results are important as the 14.5-GeV energy fills the gap in μB, which is of the order of 100 MeV, between sNN=11.5 and 19.6 GeV. Comparisons of the data with UrQMD and AMPT models show poor agreement in general.

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