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Author  |
Bas i Beneito, A.; Fajfer, S.; Petrov, A.A. |
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Title |
New avenues for |△B|=2 processes beyond neutron-antineutron oscillations |
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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 |
03 |
Issue |
3 |
Pages |
124 - 35pp |
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Keywords |
Baryon/Lepton Number Violation; Specific BSM Phenomenology |
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Abstract |
We explore baryon-number-violating (|∆B| = 2) processes beyond the well-known neutron-antineutron (n−n‾) oscillations, focusing on the Λ−Λ‾ system. The presence of a strange quark in the Λ baryon introduces a new set of six-quark operators roughly of the form (uds)2, which are different from the (udd)2 operators responsible for n−n‾ oscillations. Using the Standard Model Effective Field Theory (SMEFT), we classify all dimension-9 operators that cause |∆B| = 2 transitions and study their UV completions mediated by exotic scalar fields with trilinear interactions. We demonstrate that in these models, Λ−Λ‾ oscillations can occur at tree level, with n−n‾ mixing potentially appearing at higher loop levels. We employ a chiral effective theory to constrain the effective mass mixing δmΛΛ, deriving bounds from current experimental limits on n−n‾ oscillations and dinucleon decays such as pp → K+K+. These bounds indicate that Λ−Λ‾ oscillations probe a complementary parameter space, sensitive to baryon-number violation at scales up to 10^2 − 10^3 TeV. We show that the existing indirect bounds make it challenging to provide a competitive bound on δmΛΛ at BESIII. |
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Address |
[Beneito, Arnau Bas, I] Univ Valencia, Dept Fis Teor, Burjassot 46100, Spain, Email: arnau.bas@ific.uv.es; |
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Springer |
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English |
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Notes |
WOS:001714066800001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7138 |
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