| CMS Note | |
| Report number | CMS-CR-2011-091 ; arXiv:1107.2291 |
| Title | Isolated photon production in $\sqrt{s_{NN}}$ = 2.76 TeV PbPb collisions as a function of transverse energy and reaction centrality |
| Related title | Measurement of Inclusive Isolated Photons in PbPb Collisions with CMS |
| Author(s) | Kim, Yong-Sun (MIT) |
| Collaboration | for the CMS collaboration |
| Publication | 2011 |
| Imprint | 15 Jun 2011 |
| Number of pages | 6 |
| Note | Comments: Proceedings of parallel talk at the XXII International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Quark Matter 2011, Annecy Proceedings of parallel talk at the XXII International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Quark Matter 2011, Annecy |
| In: | J. Phys. G 38 (2011) pp.124179 |
| In: | 22nd international conference on ultrarelativistic nucleus-nucleus collisions, Annecy, France, 23 - 28 May 2011, pp.124179 |
| DOI | 10.1088/0954-3899/38/12/124179 |
| Subject category | Detectors and Experimental Techniques ; Nuclear Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| Abstract | In studies of the dense medium produced in ultra-relativistic heavy ion collisions, photons are important hard probes, since they are not expected to be modified by the medium. The measurement of isolated prompt photon production in PbPb collisions provides a test of perturbative quantum chromodynamics (pQCD) and the information to constrain the nuclear parton distribution functions. CMS has shown photon purity measurement capabilities in pp collisions using the shower shape templates. In PbPb collisions at CMS, this technique was applied for the first time in heavy ion collisions. We report the first measurement of the transverse momentum spectra of isolated photons with pT from 20 GeV/c to 80 GeV/c in PbPb collisions at $\sqrt{s_{NN}}$ =2.76 TeV. The centrality dependence of the nuclear modification factor is also reported by comparing the result to the photon spectrum of pp reference which is computed from NLO calculations. |
| Copyright/License | arXiv nonexclusive-distrib. 1.0 Preprint: (License: CC-BY-4.0) |
Corresponding record in: Inspire
Запись создана 2011-07-04, последняя модификация 2021-05-03