Opportunities with ultra-soft photons: Bremsstrahlung from stopping

TL;DR

This paper analyzes bremsstrahlung photon spectra from various stopping scenarios in heavy-ion collisions, aiming to guide experimental discrimination and photon source identification with upcoming detector capabilities.

Contribution

It introduces a detailed computation of bremsstrahlung spectra for different initial charge-rapidity distributions, highlighting their potential to distinguish stopping scenarios in heavy-ion collisions.

Findings

Different stopping scenarios produce distinguishable bremsstrahlung spectra.

Potential to discriminate stopping mechanisms with future ALICE-3 measurements.

Strategies to separate bremsstrahlung photons from other sources.

Abstract

We compute the spectra of bremsstrahlung photons for different stopping scenarios which give rise to different initial charge-rapidity distributions. In the light of novel experimental opportunities that may arise with a new heavy-ion detector ALICE-3 at the CERN LHC, we discuss how to discriminate between these stopping scenarios and how to disentangle bremsstrahlung photons from other photon sources.