| CMS Note | |
| 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) |
Corresponding record in: INSPIRE
Record created 2012-10-23, last modified 2018-06-07