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Anomalous soft photons: Status and perspectives

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 b...

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Main Authors: Bailhache, R. (Author) , Bonocore, D. (Author) , BraunMunzinger, Peter (Author) , Feal, X. (Author) , Flörchinger, Stefan (Author) , Klein, J. (Author) , Köhler, Kristian (Author) , Lebiedowicz, Piotr (Author) , Peter, C. M. (Author) , Rapp, R. (Author) , Reygers, Klaus (Author) , Schäfer, W. (Author) , Scheid, H. S. (Author) , Schweda, Kai (Author) , Stachel, Johanna (Author) , van Hees, H. (Author) , Veen, Casper Arie van (Author) , Völkl, Martin (Author)
Format: Article (Journal)
Language:English
Published: 22 October 2024
In: Physics reports
Year: 2024, Volume: 1097, Pages: 140
ISSN:03701573
DOI:10.1016/j.physrep.2024.10.002
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.physrep.2024.10.002
Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0370157324003478
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Author Notes: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, H.S. Scheid, K. Schweda, J. Stachel, H. van Hees, C.A. van Veen, M. Völkl
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Summary: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.
Item Description:Gesehen am 11.08.2025
Physical Description:Online Resource
ISSN:03701573
DOI:10.1016/j.physrep.2024.10.002

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