$K^{\ast 0}$ production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 7.7, 11.5, 14.5, 19.6, 27 and 39 GeV from RHIC beam energy scan

Abstract

We report the measurement of $K^{\ast 0}$ meson at midrapidity ($|y|<$ 1.0) in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$~=~7.7, 11.5, 14.5, 19.6, 27 and 39 GeV collected by the STAR experiment during the RHIC beam energy scan (BES) program. The transverse momentum spectra, yield, and average transverse momentum of $K^{\ast 0}$ are presented as functions of collision centrality and beam energy. The $K^{\ast 0}/K$ yield ratios are presented for different collision centrality intervals and beam energies. The $K^{\ast 0}/K$ ratio in heavy-ion collisions are observed to be smaller than that in small system collisions (e+e and p+p). The $K^{\ast 0}/K$ ratio follows a similar centrality dependence to that observed in previous RHIC and LHC measurements. The data favor the scenario of the dominance of hadronic re-scattering over regeneration for $K^{\ast 0}$ production in the hadronic phase of the medium.

arXiv comment17 pages, 12 figures

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• $K^{\ast 0}$ meson production using a transport and a statistical hadronization model at energies covered by the RHIC beam energy scan
• Effect of hadronic interaction on the flow of $K^{\ast 0}$
• Examining the influence of hadronic interactions on the directed flow of identified particles in RHIC Beam Energy Scan energies using UrQMD model
• Rescattering effects on spin-interference for ${\rho }^0$ photoproduction in heavy-ion collisions