• Open Access

Dark photon decay beyond the Euler-Heisenberg limit

Samuel D. McDermott, Hiren H. Patel, and Harikrishnan Ramani
Phys. Rev. D 97, 073005 – Published 23 April 2018
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Abstract

We calculate the exact width for a dark photon decaying to three photons at one-loop order for dark photon masses m below the e+e production threshold of 2me. We find substantial deviations from previous results derived from the lowest order Euler-Heisenberg effective Lagrangian in the range mem2me, where higher order terms in the derivative expansion are non-negligible. This mass range is precisely where the three photon decay takes place on cosmologically relevant timescales. Our improved analysis reveals a window for dark photons in the range 850KeVm2me, 105ε104 that is only constrained by possibly model-dependent bounds on the number of light degrees of freedom in the early Universe.

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  • Received 24 May 2017

DOI:https://doi.org/10.1103/PhysRevD.97.073005

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Samuel D. McDermott1, Hiren H. Patel2, and Harikrishnan Ramani1

  • 1C. N. Yang Institute for Theoretical Physics, Stony Brook, New York 11794, USA
  • 2Amherst Center for Fundamental Interactions, Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA

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Issue

Vol. 97, Iss. 7 — 1 April 2018

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