$\Upsilon$ and $\chi_c$ production in $p$+$p$ and $d$+Au collisions at $\sqrt{s_{NN}}$=200 GeV in the PHENIX experiment
ORAL
Abstract
Quarkonia production is an important probe of the thermal properties of the quark-gluon plasma (QGP). Different quarkonia have different Debye screening lengths in the QGP, depending on their radii. As the energy density in the medium increases, quarkonia with smaller radii have a larger probability of survival. By measuring the relative yields of different quarkonia, we can quantitatively compare our experimental results to the theoretical predictions from finite temperature lattice QCD. And by measuring relative production in $p$+$p$ and $d$+Au collisions of $\Upsilon$ and $\chi_c$, we can have more probes to estimate cold nuclear effects such as shadowing, nuclear absorption, or interactions with comovers. We have performed simulation studies and data analysis for the $\Upsilon \rightarrow \mu^{+}+\mu^{-}$ and $\chi_c \rightarrow J/\psi + \gamma$ decay channels in $p$+$p$ and $d$+Au collisions at forward and backward rapidities. We use the PHENIX Muon Arms($1.2<|\eta|<2.2$) for the $\Upsilon$ measurement. Additionally, we use the Muon Piston Calorimeters(MPCs, $3.1<|\eta|<3.7$) for the $\chi_c$ measurement to detect the $\chi_c$ decay photon at very forward and backward rapidities. The status of simulation studies and data analysis for $\Upsilon$ and $\chi_c$ will be shown.
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Authors
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Kwangbok Lee
Korea University