Form-factor-independent test of lepton universality in semileptonic heavy meson and baryon decays
| Parent link: | Physical Review D: covering particles, fields, gravitation, and cosmology Vol. 103, iss. 9.— 2021.— [093001, 11 p.] |
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| Other Authors: | , , , , , |
| Summary: | Title screen In the semileptonic decays of heavy mesons and baryons, the lepton-mass dependence factors out in the quadratic cos2θ coefficient of the differential cosθ distribution. We call the corresponding normalized coefficient the convexity parameter. This observation opens the path to a test of lepton universality in semileptonic heavy meson and baryon decays that is independent of form-factor effects. By projecting out the quadratic rate coefficient, dividing out the lepton-mass-dependent factor, and restricting the phase space integration to the τ lepton phase space, one can define optimized partial rates which, in the Standard Model, are the same for all three (e,μ,τ) modes in a given semileptonic decay process. We discuss how the identity is spoiled by new physics effects. We discuss semileptonic heavy meson decays such as ¯B0→D(*)+ℓ−¯νℓ and B−c→J/ψ(ηc)ℓ−¯νℓ and semileptonic heavy baryon decays such as Λb→Λcℓ−¯νℓ for each ℓ=e, μ, τ. Режим доступа: по договору с организацией-держателем ресурса |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://doi.org/10.1103/PhysRevD.103.093001 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668026 |