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Author  |
Arbelaez, C.; Helo, J.C.; Hirsch, M.; Ota, T. |
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Title |
n → Kℓ and the baryon asymmetry of the universe |
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Journal Article |
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Year |
2026 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
09 |
Issue |
9 |
Pages |
099 - 21pp |
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Keywords |
Baryon/Lepton Number Violation; Early Universe Particle Physics; SMEFT |
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Abstract |
The observed baryon asymmetry (BAU) of the universe puts strong constraints on any (B – L)-violating interaction. An observation of a (B – L)-violating nucleon decay channel would therefore have profound implications for our understanding of the BAU. Here we point out that the observation of the final state with a kaon and a charged lepton in a future nucleon decay experiment would hint at (B – L) violation even if the charge of the lepton is not determined experimentally. In SMEFT, this follows from the fact that n -> K + & ell; – arises already at dimension seven, while the (B – L)-conserving decay n -> K – & ell; + requires dimension-ten operators that, in addition, would be accompanied by lower-dimensional (B + L)-violating decay modes. An observation of n -> K & ell; in the absence of other modes such as p -> pi 0 & ell; +, would then strongly suggest that (B – L) is violated. |
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Address |
[Arbelaez, Carolina] Univ Tecn Federico Santa Maria, Casilla 110-V, Valparaiso, Chile, Email: carolina.arbelaez@usm.cl; |
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Publisher |
Springer |
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English |
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Notes |
WOS:001873702800001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7444 |
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