arXiv subjects

Haibin Zhang

Publications and source records attributed to Haibin Zhang.

57 records · Page 4Linked to original sources

arXiv2005

Open Charm Production in sqrt(s_(NN))=200 GeV Au+Au Collisions at STAR

We present first results on D^0 meson production via direct reconstruction of its hadronic decay channel D^0->K pi in minimum bias Au+Au collisions at sqrt(s_(NN))=200 GeV with p_T up to ~3 GeV/c. Single electron spectra with 1<p_T<4 GeV/c from the charm semi-leptonic decays are also analyzed from the same data set. The charm production total cross-section per nucleon-nucleon collision is measured to be 1.11+/-0.08(stat.)+/-0.42(sys.) mb in minimum bias Au+Au collisions, which is consistent with the N_(bin) scaling compared to d+Au collisions. The nuclear modification factors of the single electrons in minimum bias and 0-20% Au+Au collisions are significantly below unity at 1<p_T<4 GeV/c.

nucl-ex↗

arXiv2005

Measurement of $Δ$ and $K^{*}$ Production in $d$+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

The measurements of the transverse momentum spectra and the invariant mass distributions of $Δ(1232)$ $\to πp$, $K^{*}(892)\to πK$ resonances in $d$+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV using the STAR Time Projection Chamber (TPC) at RHIC are presented. The in-medium modification of the $Δ$ and $K^{*}$ mass and width has been studied as a function of transverse momentum ($p_T$). The particle ratios $K^{*}/K$, $Δ/p$ and the average transverse momentum ($ $) as a function of different collision centrality has been reported. The nuclear modification factors ($R_{CP}$ and $R_{dAu}$) of $Δ$ and $K^{*}$ are discussed.

nucl-ex↗

arXiv2004

Open Charm Production at STAR

We present the open charm spectra at mid-rapidity from direct reconstruction of D0, D* and D+/- in d+Au collisions at sqrt(sNN)=200 GeV using the STAR detector at RHIC. The indirect electron/positron measurements via charm semileptonic decays in p+p and d+Au collisions are also reported. The total c\bar(c) cross section per nucleon-nucleon collision is extracted from both direct and indirect measurements and are consistent with each other. By combining the D0 and semileptonic measurements together, the cross section of 1.4+/-0.2+/-0.4 mb is higher than expectations from PYTHIA and other pQCD calculations. The open charm pT distribution from direct measurements covers the pT range up to ~10 GeV/c and follows a power-law distribution.

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