Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-

Standard

Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-. / The BELLE collaboration ; Кроковный, Павел Петрович; Воробьев, Виталий Сергеевич.

In: Physical Review D, Vol. 100, No. 7, 071101, 15.10.2019.

Research output: Contribution to journal › Article › peer-review

Harvard

The BELLE collaboration, Кроковный, ПП & Воробьев, ВС 2019, 'Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-', Physical Review D, vol. 100, no. 7, 071101. https://doi.org/10.1103/PhysRevD.100.071101

APA

The BELLE collaboration, Кроковный, П. П., & Воробьев, В. С. (2019). Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-. Physical Review D, 100(7), [071101]. https://doi.org/10.1103/PhysRevD.100.071101

Vancouver

The BELLE collaboration, Кроковный ПП, Воробьев ВС. Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-. Physical Review D. 2019 Oct 15;100(7):071101. doi: 10.1103/PhysRevD.100.071101

Author

The BELLE collaboration ; Кроковный, Павел Петрович ; Воробьев, Виталий Сергеевич. / Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-. In: Physical Review D. 2019 ; Vol. 100, No. 7.

BibTeX

@article{797ad0e6b2084505ace44f00769cbb28,

title = "Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-",

abstract = "We present the first measurements of branching fractions of rare tau-lepton decays, τ-→π-ντ+- (=e or μ), 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 τ-→π-ντe+e- decay is observed for the first time with 7.0σ 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 Mπee>1.05 GeV/c2 is measured to be B(τ-→π-ντe+e-)[Mπ-e+e->1.05 GeV/c2]=(5.90±0.53±0.85±0.11)×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 BA(τ-→π-ντe+e-)=(1.46±0.13±0.21)×10-5 to BV(τ-→π-ντe+e-)=(3.01±0.27±0.43)×10-5, respectively. An upper limit is set on the branching fraction of the τ-→π-ντμ+μ- decay, B(τ-→π-ντμ+μ-)<1.14×10-5, at the 90% confidence level.",

keywords = "MONTE-CARLO, RADIATIVE-CORRECTIONS, SIMULATION",

author = "{The BELLE collaboration} and Y. Jin and H. Aihara and D. Epifanov and I. Adachi and {Al Said}, S. and Asner, {D. M.} and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and S. Bahinipati and V. Bansal and P. Behera and M. Berger and V. Bhardwaj and T. Bilka and J. Biswal and A. Bobrov and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and M. Campajola and L. Cao and D. {\v C}ervenkov and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and Cho, {H. E.} and K. Cho and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and {Di Carlo}, S. and Z. Dole{\v Z}al and Dong, {T. V.} and D. Dossett and S. Eidelman and Fast, {J. E.} and T. Ferber and N. Gabyshev and A. Garmash and A. Kuzmin and D. Matvienko and B. Shwartz and Y. Usov and A. Vinokurova and V. Zhilich and Кроковный, {Павел Петрович} and Воробьев, {Виталий Сергеевич}",

year = "2019",

month = oct,

day = "15",

doi = "10.1103/PhysRevD.100.071101",

language = "English",

volume = "100",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "AMER PHYSICAL SOC",

number = "7",

}

RIS

TY - JOUR

T1 - Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-

AU - The BELLE collaboration

AU - Jin, Y.

AU - Aihara, H.

AU - Epifanov, D.

AU - Adachi, I.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bahinipati, S.

AU - Bansal, V.

AU - Behera, P.

AU - Berger, M.

AU - Bhardwaj, V.

AU - Bilka, T.

AU - Biswal, J.

AU - Bobrov, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Campajola, M.

AU - Cao, L.

AU - Červenkov, D.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, H. E.

AU - Cho, K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Di Carlo, S.

AU - DoleŽal, Z.

AU - Dong, T. V.

AU - Dossett, D.

AU - Eidelman, S.

AU - Fast, J. E.

AU - Ferber, T.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Kuzmin, A.

AU - Matvienko, D.

AU - Shwartz, B.

AU - Usov, Y.

AU - Vinokurova, A.

AU - Zhilich, V.

AU - Кроковный, Павел Петрович

AU - Воробьев, Виталий Сергеевич

PY - 2019/10/15

Y1 - 2019/10/15

N2 - We present the first measurements of branching fractions of rare tau-lepton decays, τ-→π-ντ+- (=e or μ), 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 τ-→π-ντe+e- decay is observed for the first time with 7.0σ 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 Mπee>1.05 GeV/c2 is measured to be B(τ-→π-ντe+e-)[Mπ-e+e->1.05 GeV/c2]=(5.90±0.53±0.85±0.11)×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 BA(τ-→π-ντe+e-)=(1.46±0.13±0.21)×10-5 to BV(τ-→π-ντe+e-)=(3.01±0.27±0.43)×10-5, respectively. An upper limit is set on the branching fraction of the τ-→π-ντμ+μ- decay, B(τ-→π-ντμ+μ-)<1.14×10-5, at the 90% confidence level.

AB - We present the first measurements of branching fractions of rare tau-lepton decays, τ-→π-ντ+- (=e or μ), 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 τ-→π-ντe+e- decay is observed for the first time with 7.0σ 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 Mπee>1.05 GeV/c2 is measured to be B(τ-→π-ντe+e-)[Mπ-e+e->1.05 GeV/c2]=(5.90±0.53±0.85±0.11)×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 BA(τ-→π-ντe+e-)=(1.46±0.13±0.21)×10-5 to BV(τ-→π-ντe+e-)=(3.01±0.27±0.43)×10-5, respectively. An upper limit is set on the branching fraction of the τ-→π-ντμ+μ- decay, B(τ-→π-ντμ+μ-)<1.14×10-5, at the 90% confidence level.

KW - MONTE-CARLO

KW - RADIATIVE-CORRECTIONS

KW - SIMULATION

UR - http://www.scopus.com/inward/record.url?scp=85074909636&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.100.071101

DO - 10.1103/PhysRevD.100.071101

M3 - Article

AN - SCOPUS:85074909636

VL - 100

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 7

M1 - 071101

ER -

ID: 22323488