在\(\sqrt{s_{NN}} = 200\)GeV的金离子与金离子碰撞中，对中快度处\(D^{0}\)方位角各向异性的测量。

Measurement of D^{0} Azimuthal Anisotropy at Midrapidity in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.

作者信息

Adamczyk L, Adkins J K, Agakishiev G, Aggarwal M M, Ahammed Z, Ajitanand N N, Alekseev I, Anderson D M, Aoyama R, Aparin A, Arkhipkin D, Aschenauer E C, Ashraf M U, Attri A, Averichev G S, Bai X, Bairathi V, Behera A, Bellwied R, Bhasin A, Bhati A K, Bhattarai P, Bielcik J, Bielcikova J, Bland L C, Bordyuzhin I G, Bouchet J, Brandenburg J D, Brandin A V, Brown D, Bunzarov I, Butterworth J, Caines H, Calderón de la Barca Sánchez M, Campbell J M, Cebra D, Chakaberia I, Chaloupka P, Chang Z, Chankova-Bunzarova N, Chatterjee A, Chattopadhyay S, Chen X, Chen J H, Chen X, Cheng J, Cherney M, Christie W, Contin G, Crawford H J, Das S, De Silva L C, Debbe R R, Dedovich T G, Deng J, Derevschikov A A, Didenko L, Dilks C, Dong X, Drachenberg J L, Draper J E, Dunkelberger L E, Dunlop J C, Efimov L G, Elsey N, Engelage J, Eppley G, Esha R, Esumi S, Evdokimov O, Ewigleben J, Eyser O, Fatemi R, Fazio S, Federic P, Federicova P, Fedorisin J, Feng Z, Filip P, Finch E, Fisyak Y, Flores C E, Fulek L, Gagliardi C A, Garand D, Geurts F, Gibson A, Girard M, Greiner L, Grosnick D, Gunarathne D S, Guo Y, Gupta A, Gupta S, Guryn W, Hamad A I, Hamed A, Harlenderova A, Harris J W, He L, Heppelmann S, Heppelmann S, Hirsch A, Hoffmann G W, Horvat S, Huang T, Huang B, Huang X, Huang H Z, Humanic T J, Huo P, Igo G, Jacobs W W, Jentsch A, Jia J, Jiang K, Jowzaee S, Judd E G, Kabana S, Kalinkin D, Kang K, Kauder K, Ke H W, Keane D, Kechechyan A, Khan Z, Kikoła D P, Kisel I, Kisiel A, Kochenda L, Kocmanek M, Kollegger T, Kosarzewski L K, Kraishan A F, Kravtsov P, Krueger K, Kulathunga N, Kumar L, Kvapil J, Kwasizur J H, Lacey R, Landgraf J M, Landry K D, Lauret J, Lebedev A, Lednicky R, Lee J H, Li X, Li C, Li W, Li Y, Lidrych J, Lin T, Lisa M A, Liu H, Liu P, Liu Y, Liu F, Ljubicic T, Llope W J, Lomnitz M, Longacre R S, Luo S, Luo X, Ma G L, Ma L, Ma Y G, Ma R, Magdy N, Majka R, Mallick D, Margetis S, Markert C, Matis H S, Meehan K, Mei J C, Miller Z W, Minaev N G, Mioduszewski S, Mishra D, Mizuno S, Mohanty B, Mondal M M, Morozov D A, Mustafa M K, Nasim Md, Nayak T K, Nelson J M, Nie M, Nigmatkulov G, Niida T, Nogach L V, Nonaka T, Nurushev S B, Odyniec G, Ogawa A, Oh K, Okorokov V A, Olvitt D, Page B S, Pak R, Pandit Y, Panebratsev Y, Pawlik B, Pei H, Perkins C, Pile P, Pluta J, Poniatowska K, Porter J, Posik M, Poskanzer A M, Pruthi N K, Przybycien M, Putschke J, Qiu H, Quintero A, Ramachandran S, Ray R L, Reed R, Rehbein M J, Ritter H G, Roberts J B, Rogachevskiy O V, Romero J L, Roth J D, Ruan L, Rusnak J, Rusnakova O, Sahoo N R, Sahu P K, Salur S, Sandweiss J, Saur M, Schambach J, Schmah A M, Schmidke W B, Schmitz N, Schweid B R, Seger J, Sergeeva M, Seyboth P, Shah N, Shahaliev E, Shanmuganathan P V, Shao M, Sharma A, Sharma M K, Shen W Q, Shi Z, Shi S S, Shou Q Y, Sichtermann E P, Sikora R, Simko M, Singha S, Skoby M J, Smirnov N, Smirnov D, Solyst W, Song L, Sorensen P, Spinka H M, Srivastava B, Stanislaus T D S, Strikhanov M, Stringfellow B, Sugiura T, Sumbera M, Summa B, Sun Y, Sun X M, Sun X, Surrow B, Svirida D N, Szelezniak M A, Tang A H, Tang Z, Taranenko A, Tarnowsky T, Tawfik A, Thäder J, Thomas J H, Timmins A R, Tlusty D, Todoroki T, Tokarev M, Trentalange S, Tribble R E, Tribedy P, Tripathy S K, Trzeciak B A, Tsai O D, Ullrich T, Underwood D G, Upsal I, Van Buren G, van Nieuwenhuizen G, Vasiliev A N, Videbæk F, Vokal S, Voloshin S A, Vossen A, Wang G, Wang Y, Wang F, Wang Y, Webb J C, Webb G, Wen L, Westfall G D, Wieman H, Wissink S W, Witt R, Wu Y, Xiao Z G, Xie W, Xie G, Xu J, Xu N, Xu Q H, Xu Y F, Xu Z, Yang Y, Yang Q, Yang C, Yang S, Ye Z, Ye Z, Yi L, Yip K, Yoo I-K, Yu N, Zbroszczyk H, Zha W, Zhang Z, Zhang X P, Zhang J B, Zhang S, Zhang J, Zhang Y, Zhang J, Zhang S, Zhao J, Zhong C, Zhou L, Zhou C, Zhu X, Zhu Z, Zyzak M

机构信息

AGH University of Science and Technology, FPACS, Cracow 30-059, Poland.

University of Kentucky, Lexington, Kentucky 40506-0055.

出版信息

Phys Rev Lett. 2017 May 26;118(21):212301. doi: 10.1103/PhysRevLett.118.212301.

DOI:10.1103/PhysRevLett.118.212301

PMID:28598664

Abstract

We report the first measurement of the elliptic anisotropy (v_{2}) of the charm meson D^{0} at midrapidity (|y|<1) in Au+Au collisions at sqrt[s_{NN}]=200 GeV. The measurement was conducted by the STAR experiment at RHIC utilizing a new high-resolution silicon tracker. The measured D^{0} v_{2} in 0%-80% centrality Au+Au collisions can be described by a viscous hydrodynamic calculation for a transverse momentum (p_{T}) of less than 4 GeV/c. The D^{0} v_{2} as a function of transverse kinetic energy (m_{T}-m_{0}, where m_{T}=sqrt[p_{T}^{2}+m_{0}^{2}]) is consistent with that of light mesons in 10%-40% centrality Au+Au collisions. These results suggest that charm quarks have achieved local thermal equilibrium with the medium created in such collisions. Several theoretical models, with the temperature-dependent, dimensionless charm spatial diffusion coefficient (2πTD_{s}) in the range of ∼2-12, are able to simultaneously reproduce our D^{0} v_{2} result and our previously published results for the D^{0} nuclear modification factor.

摘要

我们报告了在√[sNN]=200 GeV的金金碰撞中，对中心快度（|y|<1）处粲介子D⁰的椭圆各向异性（v₂）的首次测量。该测量由相对论重离子对撞机（RHIC）上的STAR实验利用新型高分辨率硅追踪器进行。在0%-80%中心度的金金碰撞中测量得到的D⁰ v₂，对于横动量（pT）小于4 GeV/c的情况，可以用粘性流体动力学计算来描述。在10%-40%中心度的金金碰撞中，作为横向动能（mT - m₀，其中mT = √[pT² + m₀²]）函数的D⁰ v₂与轻介子的情况一致。这些结果表明，粲夸克已与此类碰撞中产生的介质达到局部热平衡。几个理论模型，其温度依赖的无量纲粲空间扩散系数（2πTDs）在~2 - 12范围内，能够同时重现我们的D⁰ v₂结果以及我们之前发表的D⁰核修正因子的结果。