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High Energy Physics - Phenomenology

arXiv:2308.08586 (hep-ph)
[Submitted on 16 Aug 2023]

Title:Photon-Dark Photon Conversion with Multiple Level Crossings

Authors:Nirmalya Brahma, Asher Berlin, Katelin Schutz
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Abstract:Dark photons can oscillate into Standard Model (SM) photons via kinetic mixing. The conversion probability depends sensitively on properties of the ambient background, such as the density and electromagnetic field strength, which cause the SM photon to acquire an in-medium effective mass. Resonances can enhance the conversion probability when there is a level-crossing between the dark photon and background-dependent SM photon states. In this work, we show that the widely used Landau-Zener (LZ) approximation breaks down when there are multiple level-crossings due to a non-monotonic SM photon potential. Phase interference effects, especially when the dark photon mass is close to an extremum of the SM photon effective mass, can cause deviations from the LZ approximation at the level of a few orders of magnitude in the conversion probability. We present an analytic approximation that is valid in this regime and that can accurately predict the conversion probabilities in a wide range of astrophysical environments.
Comments: 11 pages, 5 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:2308.08586 [hep-ph]
  (or arXiv:2308.08586v1 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2308.08586

Submission history

From: Nirmalya Brahma [view email]
[v1] Wed, 16 Aug 2023 18:00:00 UTC (1,099 KB)
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