Publication:
Measurement of R(D) and R(D*) with a Semileptonic Tagging Method

Дата
2020
Авторы
Caria, G.
Urquijo, P.
Adachi, I.
Aihara, H.
Pakhlov, P.
Journal Title
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Научные группы
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Научная группа
Belle Collaboration
Организационные подразделения
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Организационная единица
Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
Выпуск журнала
Аннотация
The experimental results on the ratios of branching fractions R(D) = B((B) over bar -> D tau(-)(nu) over bar (tau))/B((B) over bar -> Dl(-)(nu) over bar (e)) and R(D*) = B((B) over bar -> D*tau(-)(nu) over bar (tau))/B((B) over bar -> D*tau(-)(nu) over bar (e)), where l denotes an electron or a muon, show a long-standing discrepancy with the standard model predictions, and might hint at a violation of lepton flavor universality. We report a new simultaneous measurement of R(D) and R(D*), based on a data sample containing 772 x 10(6) B (B) over bar events recorded at the T(4S) resonance with the Belle detector at the KEKB e(+) e(-) collider. In this analysis the tag-side B meson is reconstructed in a semileptonic decay mode and the signal-side tau is reconstructed in a purely leptonic decay. The measured values are R(D) = 0.307 +/- 0.037 +/- 0.016 and R(D*) = 0.283 +/- 0.018 +/- 0.014, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the standard model predictions within 0.2, 1.1, and 0.8 standard deviations for R(D), R(D*), and their combination, respectively. This work constitutes the most precise measurements of R(D) and R(D*) performed to date as well as the first result for R(D) based on a semileptonic tagging method.
Описание
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Цитирование
Measurement of R(D) and R(D*) with a Semileptonic Tagging Method / Caria, G [et al.] // Physical Review Letters. - 2020. - 124. - № 16. - 10.1103/PhysRevLett.124.161803
URI
https://www.doi.org/10.1103/PhysRevLett.124.161803
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85084721463&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000528518000005
 https://openrepository.mephi.ru/handle/123456789/21671
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