Direct photons at low transverse momentum -- a QGP signal in pp collisions at LHC

Abstract

We investigate photon production in a scenario of quark-gluon plasma formation in proton-proton scattering at 7 TeV. It is shown that thermal photon yields increase quadratically with the charged particle multiplicity. This gives an enhanced weight to high multiplicity events, and leads to an important photon production even in minimum bias events, where the thermal photons largely dominate over the prompt ones at transverse momentum values smaller than 10 GeV/c.

4 pages, 4 figures

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• Production of single-charm hadrons by quark combination mechanism in $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV
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• New insights into hadron production mechanism from $p_T$ spectra in $pp$ collisions at $\sqrt{s}=7$ TeV
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• Constituent quark number scaling from strange hadron spectra in $pp$ collisions at $\sqrt{s}=$ 13 TeV
• Possibility for $J/\Psi$ suppression in high multiplicity proton-proton collisions at $\sqrt{s_{NN}}=7$TeV
• Correlations of Heavy Quarks Produced at Large Hadron Collider
• On QGP Formation in pp Collisions at 7 TeV
• Formation time dependence of femtoscopic $\pi \pi$ correlations in p+p collisions at $\sqrt{s_{NN}}$=7 TeV
• Signals of quark combination at hadronization in $pp$ collisions at $\sqrt{s}=200$ GeV