科研之友
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摘要
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 me. m(e) less than or similar to m' <= 2m(e), 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 850 KeV less than or similar to m' <= 2m(e), 10(-5) less than or similar to epsilon less than or similar to 10(-4) that is only constrained by possibly model-dependent bounds on the number of light degrees of freedom in the early Universe.
- 出版日期2018-4-23
