| Issue |
EPJ Web of Conferences
Volume 60, 2013
LHCP 2013 – Large Hadron Collider Physics 2013
|
|
|---|---|---|
| Article Number | 13011 | |
| Number of page(s) | 4 | |
| Section | (Parallel) Heavy Ions Session | |
| DOI | https://doi.org/10.1051/epjconf/20136013011 | |
| Published online | 26 November 2013 | |
https://doi.org/10.1051/epjconf/20136013011
Recent photon physics results from the ALICE experiment at the LHC
LPSC, Université Joseph Fourier Grenoble1, CNRS/IN2P3, Institut Polytechnique de Grenoble, 53 rue des Martyrs, Grenoble, France
a e-mail: arbor@lpsc.in2p3.fr
We present an overview of the photon analysis in pp and Pb-Pb collisions with data taken by the ALICE experiment at the LHC. The ALICE detectors reconstruct photons by using the two electromagnetic calorimeters (photon spectrometer, sampling calorimeter) and central tracking systems for photon converted e+e− pairs in the material of the inner ALICE layers. In Pb-Pb collisions the direct photon calculations underpredict the data below 4 GeV/c where it is expected to have a contribution from thermal radiations. The direct photon measurement also shows evidence for a non-zero elliptic flow for 1 < pT < 3 GeV/c. The nuclear modification factor of the π0 production at different collision centralities shows a clear pattern of strong suppression in a hot QCD medium with respect to pp collisions. Finally, parton fragmentation following hard collisions is investigated by correlating high momentum direct photons and charged hadrons with the goal of revealing new insights into medium effects in the QGP.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.