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First Observation of the Directed Flow of D^{0} and D^{0}[over ¯] in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.
- Source :
-
Physical review letters [Phys Rev Lett] 2019 Oct 18; Vol. 123 (16), pp. 162301. - Publication Year :
- 2019
-
Abstract
- We report the first measurement of rapidity-odd directed flow (v&#95;{1}) for D^{0} and D^{0}[over ¯] mesons at midrapidity (|y|<0.8) in Au+Au collisions at sqrt[s&#95;{NN}]=200 GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 10-80% Au+Au collisions, the slope of the v&#95;{1} rapidity dependence (dv&#95;{1}/dy), averaged over D^{0} and D^{0}[over ¯] mesons, is -0.080±0.017(stat)±0.016(syst) for transverse momentum p&#95;{T} above 1.5 GeV/c. The absolute value of D^{0} meson dv&#95;{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.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 123
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 31702332
- Full Text :
- https://doi.org/10.1103/PhysRevLett.123.162301