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Author  |
Hernandez, E.; Nieves, J.; Sobczyk, J.E. |
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Title |
Probing new physics and CP violation in ντn-* Λcτ – ðπ-ντþ and ν¯τp-* Λτ plus ðπ plus ν¯τþ |
Type |
Journal Article |
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Year |
2026 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
113 |
Issue |
9 |
Pages |
095005 - 17pp |
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Abstract |
We study the processes nu tau n-* Ac tau-& eth;pi-nu tau & THORN; and nu & strns;tau p-* A tau & thorn;& eth;pi & thorn;nu & strns;tau & THORN;, with particular emphasis on the pion energy and angular distributions, as a possible signal for lepton flavor universality violation, and in general of physics beyond the Standard Model (SM), as well as a sensitive probe of the tau polarization vector. We work within an effective low-energy extension of the SM with all dimension-six four-fermion operators. In this framework, complex Wilson coefficients which encode new physics can generate CP-violating contributions. We propose an observable that provides a genuine CP-odd signal due to its sensitivity to particular transverse components of the tau polarization vector. Namely, we show that the asymmetry in the azimuthal-angle distribution of the pion in the decay tau +/- -* pi +/-nu tau constitutes a smoking-gun prediction of such a beyond the SM scenario. We estimate the strength of this effect extrapolating nucleon-hyperon form factors recently obtained from lattice QCD calculations. |
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Address |
[Hernandez, E.] Univ Salamanca, Dept Fis Fundamental, E-37008 Salamanca, Spain |
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Publisher |
Amer Physical Soc |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
2470-0010 |
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Notes |
WOS:001759985100001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7228 |
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