Abstract
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Highlights
Received: 25 December 2017 Accepted: 2 February 2018 Published: 9 April 2018Publishing services provided by Knowledge EDmitri Peresunko
Prompt direct photons provide means to control the initial stage of the collision and test whether the yield suppression of hard hadrons and, in particular neutral pions in Pb-Pb collision is a final-state effect and should be attributed to the parton energy loss in the hot medium
In the frame of perturbative QCD, the production of neutral mesons in pp collisions is described by a convolution of parton distribution functions (PDF), cross-section of parton scattering and fragmentation function (FF), see e.g. [2]
Summary
Measurements of direct photon and neutral pion production in heavy-ion collisions provide a comprehensive set of observables characterizing properties of the hot QCD medium [1]. Direct photons are produced in all stages of a nucleusnucleus collision and probe the initial state of the collision as well as the space-time evolution of the produced medium. Prompt direct photons provide means to control the initial stage of the collision and test whether the yield suppression of hard hadrons and, in particular neutral pions in Pb-Pb collision is a final-state effect and should be attributed to the parton energy loss in the hot medium. Measurements of neutral meson spectra in pp collisions serve as a reference for heavy-ion collisions, and provide valuable data for confronting with perturbative QCD calculations and for studying scaling properties of hadron production at the LHC energies. HCoonwfetroencicteeothnisPaarrttiiccleleP: hDymsiictsriaPnedreAssutrnokpoh,y(s2i0cs1,8K),n“EMEenaesrugryem&ePnhtyosficnse,uptaraglems e21s0o–n2s1a6n. dDdOiIre1c0t.1p8h5o0t2o/nksewn.ivth3iA1.L17IC4E6at the LHC” in The 3rd International Page 210
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