Form-factor-independent test of lepton universality in semileptonic heavy meson and baryon decays

Form-factor-independent test of lepton universality in semileptonic heavy meson and baryon decays

Библиографические подробности
Источник:Physical Review D: covering particles, fields, gravitation, and cosmology
Vol. 103, iss. 9.— 2021.— [093001, 11 p.]
Автор-организация: Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики
Другие авторы: Groote S. Stefan, Ivanov M. A. Mikhail, Korner J. D. Juergen, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich, Santorelli P. Pietro, Tran Chien Thang
Примечания: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
Язык:английский
Опубликовано: 2021
Предметы:
электронный ресурс
труды учёных ТПУ
Online-ссылка:https://doi.org/10.1103/PhysRevD.103.093001
Формат: Электронный ресурс Статья
Запись в KOHA:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668026

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