First Observation of the Directed Flow of D^{0} and D^{0}[over ¯] in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.

J Adam,L Adamczyk,J R Adams,J K Adkins,G Agakishiev,M M Aggarwal, Z Ahammed,I Alekseev,D M Anderson, R Aoyama,A Aparin,E C Aschenauer,M U Ashraf,F G Atetalla, A Attri,G S Averichev,V Bairathi,K Barish,A J Bassill,A Behera, R Bellwied,A Bhasin, A K Bhati, J Bielcik, J Bielcikova,L C Bland,I G Bordyuzhin,J D Brandenburg, A V Brandin,J Bryslawskyj,I Bunzarov,J Butterworth, H Caines,M Calderón de la Barca Sánchez, D Cebra, I Chakaberia,P Chaloupka, B K Chan,F-H Chang,Z Chang,N Chankova-Bunzarova,A Chatterjee,S Chattopadhyay, J H Chen, X Chen,J Cheng,M Cherney,W Christie, G Contin,H J Crawford, M Csanád,S Das,T G Dedovich,I M Deppner,A A Derevschikov,L Didenko,C Dilks, X Dong, J L Drachenberg,J C Dunlop,T Edmonds, N Elsey,J Engelage,G Eppley,R Esha,S Esumi, O Evdokimov, J Ewigleben,O Eyser, R Fatemi,S Fazio,P Federic, J Fedorisin,Y Feng,P Filip,E Finch,Y Fisyak,L Fulek,C A Gagliardi,T Galatyuk,F Geurts,A Gibson,K Gopal,L Greiner,D Grosnick,A Gupta, W Guryn, A I Hamad,A Hamed,J W Harris,L He,S Heppelmann,N Herrmann, L Holub,Y Hong,S Horvat,B Huang, H Z Huang,S L Huang,T Huang,X Huang, T J Humanic,P Huo,G Igo,W W Jacobs,C Jena, A Jentsch,Y Ji,J Jia,K Jiang, S Jowzaee,X Ju,E G Judd,S Kabana,S Kagamaster,D Kalinkin,K Kang,D Kapukchyan,K Kauder,H W Ke,D Keane,A Kechechyan,M Kelsey,Y V Khyzhniak,D P Kikoła,C Kim, T A Kinghorn,I Kisel,A Kisiel, M Kocan, L Kochenda,L K Kosarzewski,L Kramarik,P Kravtsov, K Krueger,N Kulathunga Mudiyanselage,L Kumar,R Kunnawalkam Elayavalli, J H Kwasizur,R Lacey,J M Landgraf,J Lauret,A Lebedev, R Lednicky,J H Lee,C Li,W Li,X Li,Y Li,Y Liang, R Licenik,T Lin, A Lipiec, M A Lisa,F Liu, H Liu,P Liu,T Liu,X Liu, Y Liu,Z Liu, T Ljubicic,W J Llope, M Lomnitz, R S Longacre,S Luo,X Luo,G L Ma,L Ma, R Ma,Y G Ma,N Magdy, R Majka, D Mallick,S Margetis, C Markert,H S Matis,O Matonoha,J A Mazer,K Meehan, J C Mei,N G Minaev,S Mioduszewski,D Mishra, B Mohanty,M M Mondal,I Mooney,Z Moravcova,D A Morozov,Md Nasim,K Nayak,J M Nelson,D B Nemes,M Nie,G Nigmatkulov,T Niida, L V Nogach, T Nonaka,G Odyniec,A Ogawa, S Oh, V A Okorokov,B S Page, R Pak,Y Panebratsev,B Pawlik,D Pawlowska,H Pei,C Perkins,R L Pintér, J Pluta,J Porter,M Posik,N K Pruthi, M Przybycien, J Putschke,A Quintero,S K Radhakrishnan,S Ramachandran,R L Ray,R Reed, H G Ritter,J B Roberts,O V Rogachevskiy,J L Romero,L Ruan,J Rusnak,O Rusnakova,N R Sahoo,P K Sahu, S Salur,J Sandweiss, J Schambach,W B Schmidke,N Schmitz, B R Schweid,F Seck, J Seger,M Sergeeva,R Seto, P Seyboth,N Shah, E Shahaliev,P V Shanmuganathan,M Shao,F Shen,W Q Shen,S S Shi,Q Y Shou,E P Sichtermann, S Siejka,R Sikora,M Simko,J Singh,S Singha,D Smirnov, N Smirnov,W Solyst,P Sorensen,H M Spinka, B Srivastava,T D S Stanislaus,M Stefaniak, D J Stewart,M Strikhanov,B Stringfellow,A A P Suaide,T Sugiura, M Sumbera,B Summa,X M Sun,Y Sun,B Surrow,D N Svirida, M A Szelezniak, P Szymanski,A H Tang,Z Tang,A Taranenko,T Tarnowsky,A Tawfik, J H Thomas, A R Timmins,D Tlusty,M Tokarev, C A Tomkiel,S Trentalange,R E Tribble,P Tribedy,S K Tripathy,O D Tsai,B Tu,Z Tu, T Ullrich,D G Underwood,I Upsal,G Van Buren,J Vanek, A N Vasiliev,I Vassiliev,F Videbæk,S Vokal, S A Voloshin,F Wang,G Wang,P Wang, Y Wang, J C Webb, L Wen,G D Westfall,H Wieman,S W Wissink, R Witt,Y Wu,Z G Xiao,G Xie,W Xie,H Xu,N Xu,Q H Xu,Y F Xu,Z Xu,C Yang,Q Yang,S Yang,Y Yang,Z Yang,Z Ye, L Yi,K Yip, H Zbroszczyk,W Zha,D Zhang,L Zhang,S Zhang,X P Zhang,Y Zhang,Z Zhang,J Zhao,C Zhong,C Zhou,X Zhu,Z Zhu,M Zurek, M Zyzak

PHYSICAL REVIEW LETTERS（2019）

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摘要

We report the first measurement of rapidity-odd directed flow (v(1)) for D-0 and (D-0) over cap mesons at midrapidity (vertical bar y vertical bar < 0.8) in Au + Au collisions at. root s(NN) = 200 GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 10-80% Au + Au collisions, the slope of the v(1) rapidity dependence (dv(1)/dy), averaged over D-0 and <(D-0)over cap> mesons, is -0.080 +/- 0.017(stat) +/- 0.016(syst) for transverse momentum p(T) above 1.5 GeV/c. The absolute value of D-0 meson dv(1)/dy is about 25 times larger than that for charged kaons, with 3.4 sigma significance. These data give a unique insight into the initial tilt of the produced matter, and offer constraints on the geometric and transport parameters of the hot QCD medium created in relativistic heavy-ion collisions.

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