Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions

Session

Parallel Session - EM probes I

5 Nov 2019, 08:40

Wanda Reign Wuhan Hotel

Conveners

Parallel Session - EM probes I

• Ming Shao (Univ. of Sci. and Tech. of China)

142. Measurements of dileptons and photon pairs from two-photon scattering in ultra-peripheral and hadronic Pb+Pb collisions with the ATLAS detector

Prabhakar Palni for the ALICE Collaboration (AGH University of Science and Technology (PL))

05/11/2019, 08:40

Electromagnetic probes

Oral Presentation

In ultra-relativistic heavy-ion collisions, one expects copious rates of $\gamma +\gamma$ processes through the interaction of the large electromagnetic fields of the nuclei, which can produce new particles (e.g. leptons) or even lead to light-by-light scattering via loop diagrams. The latter process is a notable prediction of QED and was only recently observed by ATLAS using the full 2018...

646. Measurements of the $\gamma \gamma \to e^{+}{e}^{-}$ process and its angular correlations in UPC and peripheral Au+Au collisions with the STAR Detector

Daniel Brandenberg for the STAR Collaboration (Shandong University & Brookhaven National Laboratory)

05/11/2019, 09:00

Electromagnetic probes

Oral Presentation

Ultra-relativistic heavy ion collisions are expected to produce some of the strongest magnetic fields (${10}^{13}-{10}^{16}$ Tesla) in the Universe [1]. Recently, there has been intense interest in the magnetic fields produced by heavy ion collisions and their possible observational impacts through phenomena like the Chiral Magnetic Effect. The initial strong electromagnetic fields produced in...

352. Probing early time dynamics and QGP transport properties with photons in relativistic heavy-ion collisions

Charles Gale (McGill University)

05/11/2019, 09:20

Electromagnetic probes

Oral Presentation

We present the first study quantifying the sensitivity of hadron and photon observables to the early-time evolution in heavy-ion collisions which implements a realistic pre-equilibrium stage with effective QCD kinetic theory [1, 2] and a state-of-the-art hybrid (IP-Glasma + MUSIC + UrQMD) framework [3]. We calculate photon emission from the pre-equilibrium phase by folding the system's energy...

231. Charmonium production in Pb-Pb ultra-peripheral collisions (UPC) and Z production in pPb collisions at LHCb

Hengne Li for the LHCb Collaboration (South China Normal University (CN))

05/11/2019, 09:40

Electromagnetic probes

Oral Presentation

Photo-produced vector mesons in ultra-peripheral Pb-Pb collisions at forward rapidity are sensitive to the small-x parton distribution functions (nPDFs) in the target nucleus. In pPb collisions, measurements of the Z production in forward (pPb) and backward (Pbp) configuration are also sensitive to the nPDFs in another kinematic domain, both probes allowing to study in a complementary fashion...

83. A Non-Equilibrium Approach to Photon Emission from the Late Stages of Relativistic Heavy-Ion Collisions

Anna Schäfer (Frankfurt Institute for Advanced Studies (FIAS))

05/11/2019, 10:00

Electromagnetic probes

Oral Presentation

Cross sections for photon production in hadronic scattering processes have been calculated according to an effective chiral field theory. For $\pi +\rho \to \pi +\gamma$ and $\pi +\pi \to \rho +\gamma$ processes, these cross sections have been implemented into a novel hadronic transport approach (SMASH), which is suitable for collisions at low and intermediate energies. The...

292. Electrical Cross-Conductivity in the Hadron Gas

Jean-Bernard Rose

05/11/2019, 10:20

Electromagnetic probes

Oral Presentation

Inducing an electric field in the QCD medium generates an electric current which is proportional to the matter’s electric conductivity. Since quarks and hadrons also carry baryon and strange charge, such a field also respectively produces a baryon and strangeness current whose amplitude depends on baryo-electric and strange-electric conductivities. We dub the combination of these 3 properties...