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2019
article
First Observation of the Directed Flow of D-0 and in Au +Au Collisions at root s(NN)=200 GeV
JK Adkins, MM Aggarwal, MU Ashraf, GS Averichev, Bairathi, AK Bhati, LC Bland, JD Brandenburg, Chen Jh, AA Derevschikov, JL Drachenberg, Y Feng, CA Gagliardi, AI Hamad, JW Harris, HZ Huang, WW Jacobs, EG Judd, HW Ke, YV Khyzhniak, DP Kikola, LK Kosarzewski, C Li, W Li, MA Lisa, P Liu, X Liu, WJ Llope, RS Longacre, GL Ma, HS Matis, JA Mazer, JC Mei, NG Minaev, MM Mondal, DA Morozov, Nasim, JM Nelson, DB Nemes, LV Nogach, VA Okorokov, BS Page, RL Pinter, NK Pruthi, HG Ritter, OV Rogachevskiy, JL Romero, NR Sahoo, PK Sahu, W.B. Schmidke, PV Shanmuganathan, WQ Shen, SS Shi, QY Shou, EP Sichtermann, HM Spinka, DJ Stewart, Aap Suaide, XM Sun, DN Svirida, MA Szelezniak, Ah Tang, AR Timmins, CA Tomkiel, RE Tribble, SK Tripathy, OD Tsai, DG Underwood, SA Voloshin, F Wang, G Wang, Peixia Wang, Y Wang, ZG Xiao, QH Xu, YF Xu, Z Ye, D Zhang, L Zhang, S Zhang, XP Zhang, Y Zhang, Z Zhang
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Le résumé fourni par la source
We report the first measurement of rapidity-odd directed flow (v_{1}) for D^{0} and D^{0}[over ¯] mesons at midrapidity (|y|<0.8) in Au+Au collisions at sqrt[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 ¯] 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 3.4σ 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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Les sujets associés
High-Energy Particle Collisions ResearchParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle Interactions