Beam-energy dependence of the directed flow of protons, antiprotons, and pions in Au+Au collisions.

L Adamczyk,H Pei,J Zhao,Y Zawisza,Y Fisyak,J Bouchet,S Dhamija,R Raniwala,I Kisel,Z Sun,T Pawlak,B Mohanty,G Wang,A Davila Leyva,W Xie,A Gibson,S Chattopadhyay,L Yi,L Chen,B Surrow,P Bhattarai,D Solanki,D Garand,M Tokarev,A Ogawa,J Alford,A Kechechyan,M Calderón De La Barca Sánchez,R Haque,T Kollegger,Y Zoulkarneeva,J Porter,K Kang,P Sorensen,X Dong,K Xin,D Keane,A Bhasin,R Witt,J Lauret,S Margetis,S Salur,P Yepes,S Trentalange,R Cendejas,X Li,P Seyboth,P Chaloupka,M Lomnitz,J Butterworth,S Raniwala,A Kisiel,V Okorokov,O Eyser,A Aparin,J Sandweiss,M Cherney,A Sarkar,F Ding,A Ohlson,A Roy,M Strikhanov,D Cebra,I Bunzarov,Y Xu,J Seger,S Bültmann,S Ramachandran,D Tlusty,R Majka,R Bellwied,S Gliske,Z Tang,J Pluta,E Finch,Y Panebratsev,Z Ahammed,N Xu,I Sakrejda,A Banerjee,H Caines,J Engelage,B Sharma,P Huck,C Dilks,M Wada,E Sangaline,B Haag,B Di Ruzza,P Tribedy,Z Ye,X Huang,M Zyzak,M Vandenbroucke,B Stringfellow,G Agakishiev,G Eppley,A Lebedev,A Chikanian,H Bichsel,L Ruan,X Cui,W Peryt,D Kalinkin,Z Chang,L Eun,C Li,P Djawotho,Y Wang,J Putschke,A Quintero,G Contin,S Das,N Poljak,A Gupta,D Smirnov,G Van Nieuwenhuizen,N Smirnov,F Liu,A Kesich,S Zhang,Y Pandit,K Kauder,W Zha,J Cheng,H Wang,H Masui,R Varma,L Kumar,X Luo,I Alekseev,N Yu,R Derradi De Souza,S Horvat,A Hirsch,S Gupta,J Takahashi,L Kotchenda,N Schmitz,T Ullrich,M Shao,I Koralt,Y Guo,G Van Buren,X Zhu,A Hamed,B Pawlik,J Schambach,H Zbroszczyk,G Igo,Md Nasim,A Vossen,G Odyniec,W Christie,M Pachr,S Kabana,P Filip,H Qiu,S Fazio,K Yip,O Rusnakova,H Wieman,D Mcdonald,Y Sun,J Deng,D Grosnick,N Shah,D Arkhipkin,L Greiner,G Nigmatkulov,T Tarnowsky,R Fatemi,C Perkins,W Borowski,L Didenko,J Konzer,S Heppelmann,F Wang,I Kulakov,Y Zhang,E Shahaliev,B Srivastava,W Li,O Evdokimov,G Webb,S Mioduszewski,W Guryn,P Pile,R Stock,Z Xu,K Oh,F Videbæk,C Markert,Y Li,B Huang,J Turnau,K Krueger,M Šumbera ,O V Rogachevskiy ,Y Wu ,D P Kikoła ,Zhong Chen ,M J M Codrington ,Q Shou ,R Vértesi ,P V Shanmuganathan ,J L Drachenberg ,T J M Symons ,R A Kycia ,B K Nandi ,T P Burton ,R S Longacre ,S B Nurushev ,D P Mahapatra ,J A Vanfossen ,A Vasiliev ,A F Kraishan ,H S Xu ,J Bielčíková ,П Кравцов ,A A Derevschikov ,Y P Viyogi ,X L Wang ,O D Tsai ,C E Flores ,J C Webb ,G M.s Vasconcelos ,D G Underwood ,J H Thomas ,S K Pal ,X P Zhang ,T J Humanic ,R E Tribble ,J H Lee ,A R Timmins ,X M Sun ,R Singaraju ,W B Schmidke ,J H Chen ,M M Aggarwal ,C Anson ,L C De Silva ,T D S Stanislaus ,Xiao Zhang ,Michal Szelezniak ,G W Hoffmann ,E C Aschenauer ,P R Pujahari ,Д А Морозов ,S W Wissink ,W Q Shen ,J R Stevens ,Z M Li ,Jun Xu ,M Fusco Girard ,J F Ross ,H J Jang ,M A Lisa ,H W Ke ,D J Hofman ,A V Brandin ,M M Mondal ,R P Scharenberg ,R L Ray ,J L Romero ,B S Page ,J K Adkins ,J B Zhang ,N Sahoo ,T G Dedovich ,E P Sichtermann ,H F Chen ,N G Minaev ,L Han ,C K Riley ,J M Nelson ,J Bielčík ,H S Matis ,A H Tang ,G D Westfall ,F J M Geurts ,Y G ,A M Poskanzer ,J Roberts ,C A Gagliardi ,M K Mustafa ,M J Levine ,M Przybycień ,S Vokál ,D S Gunarathne ,D Beavis ,N K Pruthi ,Yan Wang ,J G Cramer ,L E Dunkelberger ,K D Landry ,H M Spinka ,H Z Huang ,D N Svirida ,J Novák ,H G Ritter ,D D Koetke ,J C Dunlop ,M C Cervantes ,J S Wang ,Q H Xu ,I K Yoo ,Feng Zhao ,Yang Yu ,A Schmah ,C M Du ,J M Landgraf ,W J Llope ,J L Zhang ,B A Trzeciak ,S Y Noh ,I G Bordyuzhin ,G S Averichev ,D Olvitt ,C B Yang ,D R Gangadharan ,H J Crawford ,D M M D Madagodagettige Don ,K S Engle ,J Fedorišin ,M J Skoby ,L G Efimov ,Z H Khan ,P K Sahu ,W W Jacobs ,E W Oldag ,M Planinić ,Y X Pan ,R Lednický ,S S Shi ,L V Nogach ,Z P Zhang ,R Debbe ,L C Bland ,T Ljubičić ,T K Nayak ,J Rusňák ,J E Draper ,M A.c Lamont ,S G Brovko ,J J Chwastowski ,G L ,A K Bhati ,Y Zhu ,T S Mcshane ,J W Harris ,E G Judd

doi:10.1103/physrevlett.112.162301

Abstract

Rapidity-odd directed flow (v1) measurements for charged pions, protons, and antiprotons near midrapidity (y=0) are reported in sNN=7.7, 11.5, 19.6, 27, 39, 62.4, and 200GeV Au+Au collisions as recorded by the STAR detector at the Relativistic Heavy Ion Collider. At intermediate impact parameters, the proton and net-proton slope parameter dv1/dy|y=0 shows a minimum between 11.5 and 19.6GeV. In addition, the net-proton dv1/dy|y=0 changes sign twice between 7.7 and 39GeV. The proton and net-proton results qualitatively resemble predictions of a hydrodynamic model with a first-order phase transition from hadronic matter to deconfined matter, and differ from hadronic transport calculations.

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