https://doi.org/10.1140/epjc/s10052-025-14379-4
Regular Article - Theoretical Physics
Invisible decays of vector Charmonia and Bottomonia to determine the weak mixing angle at quarkonia scale
1
Área Académica de Matemáticas y Física, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5, Código Postal 42184, Pachuca, Hgo, Mexico
2
Department of Physics and IPAP, Yonsei University, 03722, Seoul, Korea
3
CNPR, Department of Physics, Chonnam National University, 61186, Gwangju, Korea
4
Departamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado Postal 14-740, 07000, Mexico City, Mexico
Received:
8
April
2025
Accepted:
27
May
2025
Published online:
23
June
2025
We compute the branching fractions of vector quarkonia (
) decays into neutrino pairs, considering both Dirac and Majorana types, within the Standard Model (SM) and beyond. The vector nature of quarkonium states yields a decay width in the SM that depends upon the weak vector coupling of the heavy quark, offering the possibility to measure the weak mixing angle at the quarkonia mass scales. If neutrinos have non-standard neutral weak couplings, this could help to distinguish the nature of neutrinos in principle.
© The Author(s) 2025
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Funded by SCOAP3.
