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Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ - → l - ν τ ν l γ. / The BELLE collaboration.
In: Progress of Theoretical and Experimental Physics, Vol. 2018, No. 2, ARTN 023C01, 01.02.2018.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ - → l - ν τ ν l γ
AU - The BELLE collaboration
AU - Shimizu, N.
AU - Aihara, H.
AU - Epifanov, D.
AU - Adachi, I.
AU - Said, S. Al
AU - Asner, D. M.
AU - Aulchenko, V.
AU - Aushev, T.
AU - Ayad, R.
AU - Babu, V.
AU - Badhrees, I.
AU - Bakich, A. M.
AU - Bansa, V.
AU - Barberio, E.
AU - Bhardwaj, V.
AU - Bhuyan, B.
AU - Biswal, J.
AU - Bobrov, A.
AU - Bozek, A.
AU - Bračko, M.
AU - Browder, T. E.
AU - Červenkov, D.
AU - Chang, M. C.
AU - Chang, P.
AU - Chekelian, V.
AU - Chen, A.
AU - Cheon, B. G.
AU - Chilikin, K.
AU - Cho, K.
AU - Choi, S. K.
AU - Choi, Y.
AU - Cinabro, D.
AU - Czank, T.
AU - Dash, N.
AU - Di Carlo, S.
AU - Doležal, Z.
AU - Dutta, D.
AU - Eidelman, S.
AU - Fast, J. E.
AU - Ferber, T.
AU - Gabyshev, N.
AU - Garmash, A.
AU - Krokovny, P.
AU - Kuzmin, A.
AU - Shebalin, V.
AU - Shwartz, B.
AU - Usov, Y.
AU - Vorobyev, V.
AU - Zhilich, V.
AU - Zhulanov, V.
N1 - Publisher Copyright: © The Author(s) 2018.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - We present a measurement of the Michel parameters of the τ lepton, η and ξκ, in the radiative leptonic decay τ - → l - ν τ ν l γ using 711 fb -1 of collision data collected with the Belle detector at the KEKB e + e - collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of e + e - → τ + τ - → (π + π 0 ν τ )(l - ν τ ν l γ)(l = e or μ The measured values of the Michel parameters are η = -1.3 ± 1.5 ± 0.8 and ξκ = 0.5 ± 0.4 ± 0.2, where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions within their uncertainties, and constrain the coupling constants of the generalized weak interaction.
AB - We present a measurement of the Michel parameters of the τ lepton, η and ξκ, in the radiative leptonic decay τ - → l - ν τ ν l γ using 711 fb -1 of collision data collected with the Belle detector at the KEKB e + e - collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of e + e - → τ + τ - → (π + π 0 ν τ )(l - ν τ ν l γ)(l = e or μ The measured values of the Michel parameters are η = -1.3 ± 1.5 ± 0.8 and ξκ = 0.5 ± 0.4 ± 0.2, where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions within their uncertainties, and constrain the coupling constants of the generalized weak interaction.
KW - MU-MESON DECAY
KW - IDENTIFICATION
KW - ANNIHILATION
KW - LIBRARY
KW - TRIGGER
UR - http://www.scopus.com/inward/record.url?scp=85062193441&partnerID=8YFLogxK
U2 - 10.1093/ptep/pty003
DO - 10.1093/ptep/pty003
M3 - Article
AN - SCOPUS:85062193441
VL - 2018
JO - Progress of Theoretical and Experimental Physics
JF - Progress of Theoretical and Experimental Physics
SN - 2050-3911
IS - 2
M1 - ARTN 023C01
ER -
ID: 18658147