Phys.Rev.Lett.97:132301,2006 We report the measurements of $\Sigma (1385)$ and $\Lambda (1520)$ production
in $p+p$ and $Au+Au$ collisions at $\sqrt{s_{NN}} = 200$ GeV from the STAR
collaboration. ...The yields and the $p_{T}$ spectra are presented and discussed
in terms of chemical and thermal freeze-out conditions and compared to model
predictions. Thermal and microscopic models do not adequately describe the
yields of all the resonances produced in central $Au+Au$ collisions. Our
results indicate that there may be a time-span between chemical and thermal
freeze-out during which elastic hadronic interactions occur.
Phys.Rev.Lett.96:032001 (2006) The invariant differential cross section for inclusive electron production in
$p + p$ collisions at $\sqrt{s} = 200$~GeV has been measured by the PHENIX
experiment at ...the Relativistic Heavy Ion Collider over the transverse momentum
range $0.4 \le p_T \le 5.0$~GeV/$c$ in the central rapidity region ($|\eta| \le
0.35$). The contribution to the inclusive electron spectrum from semileptonic
decays of hadrons carrying heavy flavor, {\it i.e.} charm quarks or, at high
$p_T$, bottom quarks, is determined via three independent methods. The
resulting electron spectrum from heavy flavor decays is compared to recent
leading and next-to-leading order perturbative QCD calculations. The total
cross section of charm quark-antiquark pair production is determined to be
$\sigma_{c\bar{c}} = 0.92 \pm 0.15 {\rm (stat.)} \pm 0.54 {\rm (sys.)}$~mb.
We report the measurements of \(\Sigma (1385)\) and \(\Lambda (1520)\) production in \(p+p\) and \(Au+Au\) collisions at \(\sqrt{s_{NN}} = 200\) GeV from the STAR collaboration. The yields and the ...\(p_{T}\) spectra are presented and discussed in terms of chemical and thermal freeze-out conditions and compared to model predictions. Thermal and microscopic models do not adequately describe the yields of all the resonances produced in central \(Au+Au\) collisions. Our results indicate that there may be a time-span between chemical and thermal freeze-out during which elastic hadronic interactions occur.
Dynamic fluctuations in the local density of non-identified hadron tracks reconstructed in the STAR TPC are studied using the discrete wavelet transform power spectrum technique which involves mixed ...event reference sample comparison. The two-dimensional event-by-event analysis is performed in pseudo-rapidity (eta) and azimuthal angle (phi). HIJING simulations indicate that jets and mini-jets result in signals, visible without high pT selection, when the dynamic texture analysis is applied. Scanning a broad range of event multiplicities, we study the dependence of the signals on the initial conditions. Event structures are studied separately with positive and negative tracks, as well as both charges. A change of regime is observed in AuAu collisions at sqrt(S_NN}=130 GeV as event multiplicity is increased: a long range eta correlation (or suppressed fluctuation vis-a-vis mixed events) is seen in same charge data. This effect is qualitatively similar to one of the predicted manifestations of the Color Glass Condensate.
Open charm spectra at mid-rapidity from direct reconstruction of $D^{0}$($\bar{D^0}$)$\to K^{\mp}\pi^{\pm}$ in d+Au collisions and indirect electron/positron measurements via charm semileptonic ...decays in p+p and d+Au collisions at \srt = 200 GeV are reported. The $D^{0}$($\bar{D^0}$) spectrum covers a transverse momentum ($p_T$) range of 0.1 $
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