First Observation of the Directed Flow of <i>D</i><SUP>0</SUP> and &lt;(<i>D</i><SUP>0</SUP>)over bar> in Au +Au Collisions at √<i>s<sub>NN</sub></i>=200 GeV



Adam, J, Adamczyk, L, Adams, JR, Adkins, JK, Agakishiev, G, Aggarwal, MM, Ahammed, Z, Alekseev, I, Anderson, DM, Aoyama, R
et al (show 336 more authors) (2019) First Observation of the Directed Flow of <i>D</i><SUP>0</SUP> and &lt;(<i>D</i><SUP>0</SUP>)over bar> in Au +Au Collisions at √<i>s<sub>NN</sub></i>=200 GeV. PHYSICAL REVIEW LETTERS, 123 (16). 162301-.

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: STAR Collaboration
Depositing User: Symplectic Admin
Date Deposited: 04 Dec 2019 16:48
Last Modified: 09 Oct 2023 22:01
DOI: 10.1103/PhysRevLett.123.162301
Open Access URL: https://arxiv.org/pdf/1905.02052.pdf
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3064829