Report number
| CMS-CR-2012-258 |
Title
| Detailed measurements of bottomonium suppression in PbPb collisions at 2.76 TeV with CMS |
Author(s)
| Breto Rangel, Guillermo (CERN) |
Collaboration
| on behalf of the CMS Collaboration |
Publication
| 2013 |
Imprint
| 06 Oct 2012 |
Number of pages
| 5 |
In:
| Nucl. Phys. A 904-905 (2013) pp.615c-618c |
In:
| 23rd International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Washington, DC, USA, 13 - 18 Aug 2012, pp.615c-618c |
Subject category
| Detectors and Experimental Techniques |
Accelerator/Facility, Experiment
| CERN LHC ; CMS |
Abstract
| The three $\Upsilon(1S, 2S, 3S)$ states can be separated using the CMS experimental apparatus via their dimuon decays in both pp and heavy-ion collisions. A suppression of the $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ mesons is observed in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. Furthermore, a suppression of the excited $\Upsilon$ states has been measured with respect to the $\Upsilon$ ground state, expressed as a double ratio [$\Upsilon(nS)$/$\Upsilon(1S)$]$_{PbPb}$ / [$\Upsilon(nS)$/$\Upsilon(1S)$]$_{pp}$ with n = 2, 3, and 2 + 3. The centrality dependence of the double ratio, as well as the nuclear modification factors ($R_{AA}$) of the $\Upsilon(1S)$ and $\Upsilon(2S)$ states are presented as a function of collision centrality, based on the analysis of the full data sample collected during the 2011 PbPb run, which corresponds to an integrated luminosity of 150 $\mu b^{-1}$. |
Copyright/License
| Preprint: (License: CC-BY-4.0) |