Shining a Light on the QGP - Electroweak Probes Experimental Summary

Abstract

Objects which are only subject to the electroweak force are an ideal probe of QCD in high density and temperature environments as they carry information about the conditions during their production out of the QGP without interacting with it. Thus they can be used to characterize the initial state as well as several properties of the QGP and its evolution. Within this article the recent results regarding these electroweak probes presented at the 9${}^{th}$ Hard Probes Conference (Aix-les-Bains, France, 2018) will be summarized. In particular the following questions will be addressed: Can we determine the necessary energy and particle density for the QGP creation using electromagnetic probes? Can we use light-by-light scattering in heavy-ion collisions to do precision tests of QED and measure the magnetic field of the QGP? How are quark jets modified by the presence of the QGP? What can we learn about the initial state and scaling properties in pp, p(d)-A and A-A collisions from the production of high \pt\ photons, Z${}^0$ and W${}^{\pm }$ bosons? In the version provided on arXiv, additional plots are included in the appendix with respect to the version submitted for publication in the journal.

arXiv comment16 pages, 8 figures, 9th Hard Probes Conference (Aix-les-Bains, France, 2018), proceedings with additional figures

References in corpus (44)

• Physics of Ultra-Peripheral Nuclear Collisions
• Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature
• Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
• Chiral Magnetic conductivity
• Detailed measurement of the e+e- pair continuum in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV and implications for direct photon production
• Centrality Dependence of Direct Photon Production in sqrt(s_NN) = 200 GeV Au+Au Collisions
• Direct photon production in Pb-Pb collisions at $\sqrt{s_\rm{NN}}$ = 2.76 TeV
• Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Measurement of the Inclusive Upsilon production cross section in pp collisions at sqrt(s)=7 TeV
• Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Measurement of isolated photon production in pp and PbPb collisions at sqrt(sNN) = 2.76 TeV
• Measurement of Direct Photons in pp and Pb-Pb Collisions with ALICE
• Experimental overview on small collision systems at the LHC
• Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data
• Measurement of Direct Photons in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Azimuthally anisotropic emission of low-momentum direct photons in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Measurement of the cross section for inclusive isolated-photon production in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector
• Low-$p_T$ $e^{+}{e}^{-}$ pair production in Au$+$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and U$+$U collisions at $\sqrt{s_{NN}}$ = 193 GeV at STAR
• Measurement of the Differential Cross Section for Isolated Prompt Photon Production in pp Collisions at 7 TeV
• Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at sqrt(s) = 7 TeV
• Measurement of the inclusive isolated prompt photon cross section in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Observation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Measurement of photon-jet transverse momentum correlations in 5.02 TeV Pb+Pb and $pp$ collisions with ATLAS
• Centrality, rapidity and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV measured with the ATLAS detector
• Acoplanarity of Lepton Pair to Probe the Electromagnetic Property of Quark Matter
• Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 TeV
• Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV
• Direct-Photon Production in p+p Collisions at sqrt(s)=200 GeV at Midrapidity
• Direct photon elliptic flow in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions
• Observation of medium induced modifications of jet fragmentation in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV using isolated-photon-tagged jets
• The Isolated Photon Cross Section in the Central and Forward Rapidity Regions in p-pbar Collisions at sqrt(s) = 1.8 TeV
• Measurements of $W$ and $Z$ boson production in $pp$ collisions at $\sqrt{s}=5.02$ TeV with the ATLAS detector
• Direct photon production at low transverse momentum in proton-proton collisions at $\sqrt{s}$ = 2.76 and 8 TeV
• Measurement of direct photon production at Tevatron fixed target energies
• Measurement of dielectron production in central Pb-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}$ = 2.76 TeV
• Dielectron production in proton-proton collisions at $\sqrt{s}$ = 7 TeV
• PHENIX measurements of low momentum direct photon radiation
• Nuclear effects in high-p_T production of direct photons and neutral mesons
• A Reanalysis of Single Photon Data at CERN SPS
• Direct photon production and flow at low transverse momenta in pp, p-Pb and Pb-Pb collisions
• Measurement of isolated photon-hadron and jet correlations in 5 TeV pp and p-Pb collisions with the ALICE detector at the LHC
• Centrality dependence of the direct photon multiplicity in heavy ion collisions