期刊
PHYSICAL REVIEW D
卷 103, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.014027
关键词
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资金
- Conacyt
- Ciencia de Frontera Conacyt [428218]
- Fondo SEP-Cinvestav 2018 from Fundacion Marcos Moshinsky [142]
- Catedra Marcos Moshinsky (2020) from Fundacion Marcos Moshinsky
The study focuses on tau(-) -> nu(tau)pi(-)pi(0)l(+)l(-) (l = e, mu) decays, exploring inner bremsstrahlung and structure-dependent contributions to predict branching ratios. Structure-dependent effects are significant in the l = e case, while both contributions have a similar magnitude for l = mu, with predicted branching fractions reachable by experiments like BABAR and Belle(-II). Understanding these decays will help reduce backgrounds in lepton flavor and lepton number violating searches.
We study the tau(-) -> nu(tau)pi(-)pi(0)l(+)l(-) (l = e, mu) decays, which are O(alpha(2)) suppressed with respect to the dominant di-pion tau decay channel. Both the inner bremsstrahlung and the structure- (and model-) dependent contributions are considered. In the l = e case, structure-dependent effects are O(1%) in the decay rate, yielding a clean prediction of its branching ratio, 2.3 x 10(-5), measurable with BABAR or Belle(-II) data. For l = mu is, both contributions have a similar magnitude, and we get a branching fraction of (1.6 +/- 0.3) x 10(-7), reachable by the end of Belle-II operation. These decays allow one to study the dynamics of strong interactions with simultaneous weak and electromagnetic probes; their knowledge will contribute to reducing backgrounds in lepton flavor and lepton number violating searches.
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