Journal Article

GSI-2025-00294

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Anomalous soft photons: Status and perspectives

Bailhache, R. ; Bonocore, D. ; Braun-Munzinger, P.GSI* ; Feal, X. ; Floerchinger, S. ; Klein, J. ; Köhler, K. ; Lebiedowicz, P. ; Peter, C. M. ; Rapp, R. ; Reygers, K. ; Schäfer, W. ; Scheid, H. S. ; Schweda, K. (Corresponding author)GSI* ; Stachel, J. ; van Hees, H. ; van Veen, C. A. ; Völkl, M.

2024
Elsevier Science, North-Holland Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.physrep.2024.10.002  doi:10.15120/GSI-2025-00294

Report No.: arXiv:2406.17959

Abstract: 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.

Note: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Contributing Institute(s):

1. ExtreMe Matter Institute, EMMI (EXM)
2. ALICE (ALI)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
2. SFB 1225 A01 - Thermalisierungsdynamik und Infrarotphänomene in Schwerionenkollisionen (A01) (317234745) (317234745)
3. DFG project G:(GEPRIS)390783311 - EXC 2094: ORIGINS: Vom Ursprung des Universums bis zu den ersten Bausteinen des Lebens (390783311) (390783311)
4. DFG project G:(GEPRIS)491382106 - Open-Access-Publikationskosten / 2025-2027 / GSI Helmholtzzentrum für Schwerionenforschung (491382106) (491382106)

Experiment(s):

1. no experiment theory work (theory)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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