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Title of Journal: J High Energ Phys

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Abbravation: Journal of High Energy Physics

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Springer Berlin Heidelberg

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DOI

10.1016/0306-4522(92)90248-Z

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1029-8479

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How robust is a thermal photon interpretation of t

Authors: M Klasen C KleinBösing F König JP Wessels
Publish Date: 2013/10/21
Volume: 2013, Issue: 10, Pages: 119-
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Abstract

We present a systematic theoretical analysis of the ALICE measurement of lowp T directphoton production in central leadlead collisions at the LHC with a centreofmassenergy of sqrts NN =276 TeV Using NLO QCD we compute the relative contributions to promptphoton production from different initial and final states and the theoretical uncertainties coming from independent variations of the renormalisation and factorisation scales the nuclear parton densities and the fragmentation functions Based on different fits to the unsubtracted and promptphoton subtracted ALICE data we consistently find T = 304 ± 58MeV and 309 ± 64MeV for the effective temperature of the quarkgluon plasma or hot medium at p T ∈ 08 22 GeV and p T ∈ 15 35 GeV as well as a powerlaw p T4 behavior for p T 4 GeV as predicted by QCD hard scattering

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