# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Cold nuclear matter effects on $\Upsilon(1S+2S+3S)$ production

16 Aug 2012, 16:00
2h

Poster Heavy flavor and quarkonium production

### Speaker

Kwangbok Lee (Losalamos National Laboratory)

### Description

$\Upsilon(1S+2S+3S)$ are measured in $d$ + Au and $p$ + $p$ collisions at $\sqrt{s_{NN}}$= 200 GeV by the PHENIX experiment in the di-muon decay channel at 1.2 < |y| < 2.2. Compared to the $J/\psi$, the $Upsilon$'s heavier mass makes it possible to study the nuclear effects on the gluon distribution in different kinematic regions than those probed by the $J/\psi$. The measured results are compared to a nuclear shadowing model, EPS09 combined with a final state absorption cross section, $\sigma_{br}$, and contrasted with the PHENIX $J/psi$ results. We also will compare to lower energy $p$ + A results. Conclusive findings on $\sigma_{br}$ are difficult to obtain due to the large experimental uncertainties. However the degree of suppression is found to agree within uncertainties with the lower energy measurement as well as the $J/\psi$. In this poster, the details of the analysis procedure will be shown.

### Primary author

Kwangbok Lee (Losalamos National Laboratory)

### Presentation Materials

There are no materials yet.