We present the $p_{T}$ spectra, elliptic flow ($v_2$) and coalescence parameters $B_{2}$ for $d$, $bar{d}$ ($1<p_{T}<4$ GeV/c) and $B_{3}$ for $^{3}He$, $bar{^{3}He}$ ($2<p_{T}<6$ GeV/c) produced at mid-rapidity in Au+Au col lisions at $sqrt{s_{_{NN}
}} = 200$ GeV. The results are measured in the STAR experiment at RHIC. The spectra of the light nuclei show softer $p_T$ distributions than calculations from a blast-wave model in which the parameters were fixed from pion, kaon and proton $v_2$($p_T$) and $p_T$ distributions. The coalescence volume is found to track with pion HBT re sults for different collision geometries. The $v_2$ measurement for $d(overline{d})$ as a function of transverse momentum $p_T$ is found to follow an approximate atomic mass number ($A$) scaling while that of $^{3}He(bar{^{3}He}) $ deviates slightly from the scaling. A negative $v_{2}$ has been observed for $bar{d}$ at low $p_{T}$, consiste nt with large radial flow in Au+Au collisions.
We have implemented the Tsallis statistics in a Blast-Wave model and applied it to mid-rapidity transverse-momentum spectra of identified particles measured at RHIC. This new Tsallis Blast-Wave function fits the RHIC data very well for $p_T<$3 GeV/$c
$. We observed that the collective flow velocity starts from zero in p+p and peripheral Au+Au collisions growing to 0.470 $pm$ 0.009($c$) in central Au+Au collisions. The $(q-1)$ parameter, which characterizes the degree of non-equilibrium in a system, changes from $0.100pm0.003$ in p+p to $0.015pm0.005$ in central Au+Au collisions, indicating an evolution from a highly non-equilibrated system in p+p collisions toward an almost thermalized system in central Au+Au collisions. The temperature and collective velocity are well described by a quadratic dependence on $(q-1)$. Two sets of parameters in our Tsallis Blast-Wave model are required to describe the meson and baryon groups separately in p+p collisions while one set of parameters appears to fit all spectra in central Au+Au collisions.
We present the recent results on non-photonic electron (NPE) yields from RHIC run8 p+p collisions. The $e/pi$ ratio as a function of $p_T$ in run8 with a factor of 10 reduction of the inner detector material at STAR is found to be consistent with tho
se results from run3 taking into account the NPE from charm leptonic decay and the difference of photonic electron yield from photon conversion in detector material. Jpsi spectra in pp and cucu collisions at sNN = 200 GeV with high sampled luminosity Jpsi spectrum at high-pT follows $x_T$ scaling, but the scaling is violated at low pT. $J/psi$-hadron correlations in pp collisions are studied to understand the Jpsi production mechanism at high $p_T$. We observed an absence of charged hadrons accompanying Jpsi on the near-side, in contrast to the strong correlation peak in the di-hadron correlations. This constrains the $B$-meson contribution and jet fragmentation to inclusive Jpsi to be ${}^{<}_{sim}17%$. Yields in minimum-bias cucu collisions are consistent with those in pp collisions scaled by the underlying binary nucleon-nucleon collisions in the measured pT range. Other measurements and future projects related to heavy-flavors are discussed.
I will present an overview of identified particle spectra at high $p_T$ ($p_T{}^{>}_{sim}$ 5 GeV/$c$) in both p+p collisions and AA collisions at RHIC. In p+p collisions, summary of particle ratios of K, $eta$, $omega$, $rho$, $phi$, $p$, $bar{p}$, $
Lambda$ and heavy-flavor (open charm, $J/Psi$) to $pi$ at high-pt will be compiled and compared to the ratios of integrated yields. The spectra are used in $x_t$ scaling study and compared to pQCD calculations. These will help us establish particle composition in jets and the quark and gluon contributions to hadron production at high $p_T$. Similar jet chemistry has been extracted in Au+Au data in search for a quantitative measure of color charge dependence of jet energy loss.
