Different unitarization prescriptions for the Sommerfeld enhancement are equivalent to leading order and yield a regulator-independent formula for multi-state systems written only in terms of the standard enhancement factor, the hard annihilation amplitude, and the long-range S-matrix.
Urban,NLO electroweak potentials for minimal dark matter and beyond,JHEP10(2021) 136 [2108.07285]
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On the equivalence of unitarization prescriptions for the Sommerfeld enhancement
Different unitarization prescriptions for the Sommerfeld enhancement are equivalent to leading order and yield a regulator-independent formula for multi-state systems written only in terms of the standard enhancement factor, the hard annihilation amplitude, and the long-range S-matrix.