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Strangeness in STAR experiment at RHIC

Author:
Shi, Shusu  


Journal:
Journal of Physics: Conference Series


Issue Date:
2017


Abstract(summary):

We present the recent results of strangeness production at the mid-rapidity in Au + Au collisions at RHIC, from root s(NN) =3D 7.7 to 200 GeV. Elliptic asymmetry v(2) of multi-strange baryon Omega and phi mesons are similar to that of pions and protons in the intermediate PT range (2 - 5 GeV/c) in root s(NN) =3D 200 GeV Au + Au collisions, indicating that the major part of collective flow has been built up at partonic stage. The breaking of mass ordering between phi mesons and protons in the low (PT) range (< 1 GeV/c) is consistent with a picture that phi mesons are less sensitive to later hadronic interaction. The nuclear modification factor R-CP and baryon to meson ratio change dramatically when the collision energy is lower than 19.6 GeV. It suggests a possible change of the created QCD medium properties at lower energies compared to those from high energies.


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