Thu·Jun 27, 2024Thursday·June 27, 2024

1. 01*

   Anomalous soft photons: status and perspectives

   R. Bailhache🇩🇪 · D. Bonocore🇩🇪 · P. Braun-Munzinger🇩🇪 · X. Feal🇪🇸 · S. Floerchinger🇩🇪 · J. Klein🇨🇭 · K. Köhler🇩🇪 · P. Lebiedowicz🇵🇱 · C.M. Peter🇩🇪 · R. Rapp🇺🇸 · K. Reygers🇩🇪 · W. Schäfer🇵🇱 and 6 other authors

   This report summarizes the work of the EMMI Rapid Reaction Task Force on "Real and Virtual Photon Production at Ultra-Low Transverse Momentum and Low Mass at the LHC". We provide an overview of the soft-photon puzzle, i.e., of the long-standing discrepancy between experimental data and predictions based on Low's soft-photon theorem, also referred to as "anomalous" soft photon production, and we review the current theoretical understanding of soft radiation and soft theorems. We also focus on low-mass dileptons as a tool for determining the electrical conductivity of the medium produced in high-energy nucleus-nucleus collisions. We discuss how both topics can be addressed with the planned ALICE 3 detector at the LHC.

   nucl-exhep-exhep-phPhys.Rept.(2024)·10 citations
2. 02*

   Neural Network Emulation of Flow in Heavy-Ion Collisions at Intermediate Energies

   Nicholas Cox🇺🇸 · Xavier Grundler🇺🇸 · Bao-An Li🇺🇸

   Applications of new techniques in machine learning are speeding up progress in research in various fields. In this work, we construct and evaluate a deep neural network (DNN) to be used within a Bayesian statistical framework as a faster and more reliable alternative to the Gaussian Process (GP) emulator of an isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model simulator of heavy-ion reactions at intermediate beam energies. We found strong evidence of DNN being able to emulate the IBUU simulator's prediction on the strengths of protons' directed and elliptical flow very efficiently even with small training datasets and with accuracy about ten times higher than the GP. Limitations of our present work and future improvements are also discussed.

   ↳ nucl-thhep-phnucl-exPRC(2024)·6 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.