Publication:
Observation of tau(-) -> pi(-)nu(tau)e(+)e(-) and search for tau(-) -> pi(-)nu(tau)mu(+)mu(-)

Файлы
PhysRevD.100.071101.pdf(394.63 KB)
Дата
2019
Авторы
Jin, Y.
Aihara, H.
Epifanov, D.
Adachi, I.
Pakhlov, P.
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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.
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Аннотация
We present the first measurements of branching fractions of rare tau-lepton decays, tau(-) -> pi(-)nu(tau)l(+)l(-) (l = e or mu), using a data sample corresponding to 562 fb(-1) collected at a center-of-mass energy of 10.58 GeV with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The tau(-) -> pi(-)nu(tau)e(+)e(-) decay is observed for the first time with 7.0 sigma significance. The partial branching fraction determined by the structure-dependent mechanisms mediated by either a vector or an axial-vector current for the mass region M-pi ee > 1.05 GeV/c(2) is measured to be B(tau(-) -> pi(-)nu(tau)e(+)e(-))[M pi-e+e- > 1.05 GeV/c(2)] = (5.90 +/- 0.53 +/- 0.85 +/- 0.11) x 10(-6), where the first uncertainty is statistical, the second is systematic, and the third is due to model dependence. In the full phase space, due to the different detection efficiencies for the structure-dependent mechanisms mediated by axial-vector and vector currents, the branching fraction varies from B-A(tau(-) -> pi(-)nu(tau)e(+)e(-)) = (1.46 +/- 0.13 +/- 0.21) x 10(-5) to B-V(tau(-) -> pi(-)nu(tau)e(+)e(-)) = (3.01 +/- 0.27 +/- 0.43) x 10(-5), respectively. An upper limit is set on the branching fraction of the tau(-) -> pi(-)nu(tau)mu(+)mu(-) decay, B(tau(-) -> pi(-)nu(tau)mu(+)mu(-)) < 1.14 x 10(-5), at the 90% confidence level.
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Цитирование
Observation of tau(-) -> pi(-)nu(tau)e(+)e(-) and search for tau(-) -> pi(-)nu(tau)mu(+)mu(-) / Jin, Y [et al.] // Physical Review D. - 2019. - 100. - № 7. - 10.1103/PhysRevD.100.071101
URI
https://www.doi.org/10.1103/PhysRevD.100.071101
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85074909636&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000490172200001
 https://openrepository.mephi.ru/handle/123456789/19699
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