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arXiv · 2608.26670

Post-sphaleron conversion between baryon and lepton numbers

Pei-Hong Gu
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Abstract

The conversion between baryon and lepton numbers has a significant impact on the mechanisms for dynamically generating the matter-antimatter asymmetry in the present universe. Under the traditional wisdom, such conversion originates from the so-called electroweak sphaleron processes. In this work we find that in association with a proper scalar and the other TeV new physics, the baryon-lepton conversion can still keep efficient after the electroweak sphalerons are no longer active. Moreover this scenario can provide a solution to the puzzle of neutron lifetime and predict some decay modes of multi-nucleons to multi-leptons.

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Pei-Hong Gu. 2026-08-27. Post-sphaleron conversion between baryon and lepton numbers. https://arxiv.org/abs/2608.26670

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