New information on photon fragmentation functions

Abstract

Thermal photons radiated in heavy-ion collisions represent an important signal for a recently discovered new state of matter, the deconfined quark-gluon plasma. However, a clean identification of this signal requires precise knowledge of the prompt photons produced simultaneously in hard collisions of quarks and gluons, mostly through their fragmentation. In this paper, we demonstrate that PHENIX data on photons produced in proton-proton collisions with low transverse momenta allow to extract new information on this fragmentation process. While existing data do not yet convincingly favor one parameterization (BFG II) over the two other frequently used photon fragmentation functions (BFG I and GRV NLO), the data sets recorded by PHENIX and STAR at BNL RHIC in 2013 with tenfold higher statistics should allow for such an analysis.

5 pages, 3 figures, 1 table

References in corpus (10)

• New parton distributions for collider physics
• Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature
• A new critical study of photon production in hadronic collisions
• Measurement of Direct Photons in pp and Pb-Pb Collisions with ALICE
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector using 4.6 fb-1
• Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV
• Photon - Jet Correlations and Constraints on Fragmentation Functions
• Measurement of the quark to photon fragmentation function through the inclusive production of prompt photons in hadronic Z^0 decays
• Measurement of the cross section for direct-photon production in association with a heavy quark in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV
• Measurements of Fragmentation Photons with the PHENIX Detector

Cited by in corpus (11)

• The production of photons in relativistic heavy-ion collisions
• Parton Fragmentation Functions
• Collectivity and electromagnetic radiation in small systems
• Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma
• Direct real photons in relativistic heavy ion collisions
• Nuclear PDFs After the First Decade of LHC Data
• Prompt photon production and photon-jet correlations at the LHC
• Access to Photon Fragmentation Functions in Hadronic Jet Production
• Constraining fragmentation functions through hadron-photon production at higher-orders
• QCD analysis and effective temperature of direct photons in lead-lead collisions at the LHC
• Prompt photon production and photon-hadron jet correlations with POWHEG