Directed Flow Of Identified Particles In Au Plus Au Collisions At Root S-Nn=200 Gev At Rhic

L Adamczyk, Xiaodong Zhu,H M Spinka,M J Levine,M J Skoby,J M Landgraf,Wei Xu,S Heppelmann,J Seger,G Van Nieuwenhuizen,Peter Chung,Jie Zhao,Zhong Peng Zhang,T P Burton,Jin Ha Lee, B A Trzeciak,H Masui,Yuanyuan Zhang,L C De Silva, R Lednicky,Kyoungdon Kang,P Kravtsov,A Sarkar,V Kizka, S Mioduszewski,P Chaloupka,Donald M Mcdonald,Ik Yoo, L M Lima,Z M Li,S A Voloshin,R N Singaraju, A K Bhati, Z Ahammed,W Korsch,M Pachr,Y X Pan,T Pawlak,K Xin,J Y Chen,N Xu,C B Powell,A Kechechyan, J B Zhang, O G Grebenyuk,Fei Ding,M G Munhoz,I G Bordyuzhin,D R Gangadharan, D Olson,J Kiryluk,R E Tribble,J L Romero,N R Sahoo,N Poljak, D Cebra,Y Pandit,W Borowski,M Elnimr,M A Lisa,Wenting Li,J Bouchet,Kyuhwan Oh,S Vokal,A Bhasin,A V Brandin,Y F Wu,J Seele,Xiaofeng Li,A H Tang,J Alford,T Kollegger,C Anson,R Debbe,H F Chen,G W Hoffmann,P Filip,R Corliss,D P Kikola,X Z Cai, R P Redwine,F J M Geurts,Shuanglin Zhang,E P Sichtermann,J Schambach,Qing Wang,D Keane, S Margetis,S G Brovko,R Derradi De Souza, M C Cervantes,Jun Deng, Feng Liu,Y N Gorbunov,Jifa Tian, M Strikhanov,Q H Xu,Lalit Kumar,G Wang,S R Klein,J R Stevens, J B Roberts,J P Hayswehle,A Szanto De Toledo,B Haag,D Thein, N Smirnov,O Evdokimov,L C Bland, M Cherney,M Planinic, C Markert,S Horvat,M K Mustafa,Min Shao,T Schuster,D D Koetke,I Koralt, S Gliske, H Pei,T D S Stanislaus, D G Underwood,J Takahashi,W W Jacobs,L G Efimov,J Kapitan,D Tlusty,P Tribedy, J Lauret,J C Dunlop, J Bielcik,Yan Sun,B Pawlik,T G Dedovich, M C Suarez, X L Wang, M Przybycien,X M Sun,A V Alakhverdyants,O Hajkova,J Konzer, A Hirsch, S Kabana,C Jena,M J Betancourt, M Sharma,S Chattopadhyay,Y Mohammed,O V Rogachevskiy, Zhiqiang Xu,S W Wissink,T S Mcshane,A Luszczak,P R Pujahari,A Schmah,B Stringfellow, B Mohanty,J Joseph, Xiaojiang Cui,D Prindle,W Witzke, H Bichsel,I Sakrejda,B Surrow, A Kisiel,L Didenko,J Balewski,D J Hofman,M Calderon De La Barca Sanchez,D Solanki, Ronald Stock,P Yepes, T A Trainor,J Porter,P Djawotho,Zhongdang Xiao,J Engelage,Md Nasim, B Srivastava,Y Fisyak,H Wieman,Z Barnovska, W Peryt,Chunyang Li, J W Harris,K Kauder,Hao Xu, Zhenquan Sun, J Fedorisin,V Okorokov,W Guryn,L I Koroleva,F Videbaek,O Mall,H Zbroszczyk, A Ohlson,I Alekseev,Hui Wang, M M Aggarwal,E Bruna,L H Tarini,Peter M Huck, Liqiong Xue, T J Humanic, S Salur, Fuping Wang, J G Cramer,D Kettler,L Kotchenda,J H Thomas,C M Du, T K Nayak,C Perkins,Wei Xie, Z Tang,J Rusnak,Y Zoulkarneeva,B D Anderson,R S Longacre, M Sumbera,D Grosnick,J S Wang,Jun Cheng,Lin Ruan,D Arkhipkin,G Van Buren,T Ullrich,A Davila Leyva, Xinhan Dong,A R Timmins,K Yip, H Caines,N J Shah,J Chwastowski, S Raniwala, A Chikanian, J Putschke,S Bueltmann, Rosi Jan Reed,P Sorensen,N K Pruthi,A Vossen,G Agakishiev,B S Sharma,Yiming Xu, S Gupta,Li Li,L Eun,E Finch,G S Averichev,S Dhamija,Y Panebratsev,A Kesich,D Plyku,S Trentalange,H J Crawford,O D Tsai,E G Judd,J C Webb, A Lebedev,M J M Codrington,Lx Han,K Krueger,J A Vanfossen,Q Y Shou,R Fatemi,C K Riley,N Schmitz, Yangyang Wang,B Huang,D P Mahapatra,D R Beavis,X Luo,B S Page,R R Betts,E Sangaline,J E Draper,E W Oldag,E Shahaliev,S Lapointe, Lieping Chen,T J M Symons,Yi Yang,L V Nogach,Akira Ogawa,R A N Oliveira, Fu Zhao,C Whitten,S S Shi,M Tokarev,G D Westfall, Yeying Lu,Y H Zhu,M Mitrovski,R Varma,Y G Ma,J M Butterworth,H W Ke, B K Nandi, J Bielcikova,Y Yi,J Turnau,Gregory E Webb,J Pluta,T Ljubicic, R Bellwied,M A C Lamont, C A Gagliardi,A Hamed,I Bunzarov,Y P Viyogi,R G Fersch,G Odyniec,Yan Li,H S Matis,P Pile,R Cendejas,W J Llope, R P Scharenberg,G Eppley,Chong Zhong,D N Svirida,Amiya K Banerjee,G Igo,L E Dunkelberger, R Majka, S K Pal,G L Ma,X P Zhang,H Z Huang, J L Drachenberg,A M Poskanzer,S G Steadman,H Qiu, R L Ray, R Raniwala,W M Zhang,William Axel Leight,L Huo,M Naglis,T Tarnowsky,G M S Vasconcelos,J Sandweiss,W Christie,U G Desouza,Masahisa Wada, C Pruneau,M Zawisza,A A P Suaide,B V Morozov,P Seyboth,H G Ritter,R Witt

PHYSICAL REVIEW LETTERS（2012）

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摘要

STAR's measurements of directed flow (v(1)) around midrapidity for pi(+/-), K-+/-, K-S(0), p, and (p) over bar in Au + Au collisions at root s(NN) = 200 GeV are presented. A negative v(1) (y) slope is observed for most of produced particles (pi(+/-), K-+/-, K-S(0), p, and (p) over bar). In 5%-30% central collisions, a sizable difference is present between the v(1)(y) slope of protons and antiprotons, with the former being consistent with zero within errors. The v(1) excitation function is presented. Comparisons to model calculations (RQMD, UrQMD, AMPT, QGSM with parton recombination, and a hydrodynamics model with a tilted source) are made. For those models which have calculations of v(1) for both pions and protons, none of them can describe v(1()y) forpions and protons simultaneously. The hydrodynamics model with a tilted source as currently implemented cannot explain the centrality dependence of the difference between the v(1)(y) slopes of protons and antiprotons.

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star,gold,hydrodynamics

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