3 S ep 2 00 9 Yields and elliptic flow of d ( d ) and 3 He ( 3 He ) in Au + Au collisions at √ s NN = 200 GeV
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چکیده
We present the pT spectra, elliptic flow (v2) and coalescence parameters B2 for d, d (1 < pT < 4 GeV/c) and B3 for He, 3He (2 < pT < 6 GeV/c) produced at mid-rapidity in Au+Au collisions at √ s NN = 200 GeV. The results are measured in the STAR experiment at RHIC. The spectra of the light nuclei show softer pT distributions than calculations from a blast-wave model in which the parameters were fixed from pion, kaon and proton v2(pT ) and pT distributions. The coalescence volume is found to track with pion HBT results for different collision geometries. The v2 measurement for d(d) as a function of transverse momentum pT is found to follow an approximate atomic mass number (A) scaling while that of He(3He) deviates slightly from the scaling. A negative v2 has been observed for d at low pT , consistent with large radial flow in Au+Au collisions.
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تاریخ انتشار 2009