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arXiv · 1705.00619

Dark Photon Decay Beyond The Euler-Heisenberg Limit

Samuel D. McDermott·Hiren H. Patel·Harikrishnan Ramani
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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 2m_e. We find substantial deviations from previous results derived from the lowest order Euler-Heisenberg effective Lagrangian in the range m_e < m' < 2m_e, where higher order terms in the derivative expansion are nonnegligible. This mass range is precisely where the three photon decay takes place on cosmologically relevant timescales. Our improved analysis opens a window for dark photons in the range 850 keV < m' < 2m_e, 10^-5 < epsilon < 10^-4.

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Samuel D. McDermott, Hiren H. Patel, Harikrishnan Ramani. 2017-05-01. Dark Photon Decay Beyond The Euler-Heisenberg Limit. https://doi.org/10.1103/physrevd.97.073005

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