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Closer look at dark vector splitting functions in proton bremsstrahlung

S. Foroughi-Abari1,2,*, P. Reimitz3,†, and A. Ritz2,‡

  • *Contact author: saeidf@physics.carleton.ca
  • †Contact author: peter@if.usp.br
  • ‡Contact author: aritz@uvic.ca
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Phys. Rev. D 112, 015030 – Published 31 July, 2025

DOI: https://doi.org/10.1103/fzlm-gsd7

Abstract

High luminosity colliders and fixed target facilities using proton beams are sensitive to new weakly coupled degrees of freedom across a broad mass range. Among the various production modes, bremsstrahlung is particularly important for dark sector degrees of freedom with masses between 0.5 and 2.0 GeV, due to mixing with hadronic resonances. In this paper, we revisit the calculation of dark vector production via initial state radiation in non-single-diffractive scattering, using an improved treatment of the splitting functions and timelike electromagnetic form factors. The approach is benchmarked by applying an analogous calculation to model inclusive ρ-meson production, indicating consistency with data from NA27 in the relevant kinematic range.

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Phys. Rev. D 112, 015030– Published 31 July, 2025
  • Received 20 September 2024
  • Accepted 4 July 2025
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