Hadronic resonance production in $d$+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV at RHIC

Abstract

We present the first measurements of the $\rho (770{)}^0$, $K^{\ast }$(892), $\Delta$(1232)${}^{++}$, $\Sigma$(1385), and $\Lambda$(1520) resonances in $d$+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV, reconstructed via their hadronic decay channels using the STAR detector at RHIC. The masses and widths of these resonances are studied as a function of transverse momentum ($p_T$). We observe that the resonance spectra follow a generalized scaling law with the transverse mass ($m_T$). The $<p_T>$ of resonances in minimum bias collisions is compared to the $<p_T>$ of $\pi$, $K$, and $\bar{p}$. The ${\rho }^0/{\pi }^{-}$, $K^{\ast }/K^{-}$, ${\Delta }^{++}/p$, $\Sigma (1385)/\Lambda$, and $\Lambda (1520)/\Lambda$ ratios in $d$+Au collisions are compared to the measurements in minimum bias $p+p$ interactions, where we observe that both measurements are comparable. The nuclear modification factors ($R_{dAu}$) of the ${\rho }^0$, $K^{\ast }$, and ${\Sigma }^{\ast }$ scale with the number of binary collisions ($N_{bin}$) for $p_T>$ 1.2 GeV/$c$.

arXiv commentSTAR Collaboration. Submitted to PRC

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