Abstract
Abstract
We explore hypothetical vector particles, dark photons γ′, which mix with the Standard Model photons and thus mediate interactions with charged particles into the hidden sector. We study the elastic proton bremsstrahlung of dark photons with masses 0.4–1.8 GeV, relevant for direct searches with proton accelerators. A key feature of our calculation is that it explicitly considers the non-zero momentum transfer between protons in the process pp → ppγ′. We compare the obtained differential and full bremsstrahlung cross sections with the results of other authors. Our calculation agrees well (up to 3–9% corrections) with the Weizsacker-Williams approximation that confirms its applicability for proton beams. Then we refine predictions for the dark photon production with proton beams of energy 30 GeV, 70 GeV, 120 GeV and 400 GeV relevant for past, present and future experiments considered in literature.
Publisher
Springer Science and Business Media LLC
Reference69 articles.
1. V.C. Rubin and W.K. Ford Jr., Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions, Astrophys. J. 159 (1970) 379 [INSPIRE].
2. I. de Martino et al., Dark matters on the scale of galaxies, Universe 6 (2020) 107 [arXiv:2007.15539] [INSPIRE].
3. Super-Kamiokande collaboration, Evidence for oscillation of atmospheric neutrinos, Phys. Rev. Lett. 81 (1998) 1562 [hep-ex/9807003] [INSPIRE].
4. M. Ahlers, K. Helbing and C. Pérez de los Heros, Probing Particle Physics with IceCube, Eur. Phys. J. C 78 (2018) 924 [arXiv:1806.05696] [INSPIRE].
5. R. Essig et al., Working Group Report: New Light Weakly Coupled Particles, in the proceedings of the Snowmass 2013: Snowmass on the Mississippi, Minneapolis, U.S.A., July 29 – August 06 (2013) [arXiv:1311.0029] [INSPIRE].