Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ- → l- ντ νl γ
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Shimizu, N; Aihara, H; Epifanov, D; Adachi, I; Said, SA; Asner, DM; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bakich, AM; Li, Y ...
Published in: Progress of Theoretical and Experimental Physics
February 1, 2018
We present a measurement of the Michel parameters of the τ lepton, η and ξκ, in the radiative leptonic decay τ- → l- ντνlγ 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+π0ντ)(l- ντνlγ)(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.
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Published In
Progress of Theoretical and Experimental Physics
DOI
EISSN
2050-3911
Publication Date
February 1, 2018
Volume
2018
Issue
2
Related Subject Headings
- 51 Physical sciences
- 49 Mathematical sciences
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Shimizu, N., Aihara, H., Epifanov, D., Adachi, I., Said, S. A., Asner, D. M., … Mussa, R. (2018). Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ- → l- ντ νl γ. Progress of Theoretical and Experimental Physics, 2018(2). https://doi.org/10.1093/ptep/pty003
Shimizu, N., H. Aihara, D. Epifanov, I. Adachi, S. A. Said, D. M. Asner, V. Aulchenko, et al. “Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ- → l- ντ νl γ.” Progress of Theoretical and Experimental Physics 2018, no. 2 (February 1, 2018). https://doi.org/10.1093/ptep/pty003.
Shimizu N, Aihara H, Epifanov D, Adachi I, Said SA, Asner DM, et al. Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ- → l- ντ νl γ. Progress of Theoretical and Experimental Physics. 2018 Feb 1;2018(2).
Shimizu, N., et al. “Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ- → l- ντ νl γ.” Progress of Theoretical and Experimental Physics, vol. 2018, no. 2, Feb. 2018. Scopus, doi:10.1093/ptep/pty003.
Shimizu N, Aihara H, Epifanov D, Adachi I, Said SA, Asner DM, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich AM, Bansa V, Barberio E, Bhardwaj V, Bhuyan B, Biswal J, Bobrov A, Bozek A, Bračko M, Browder TE, Červenkov D, Chang MC, Chang P, Chekelian V, Chen A, Cheon BG, Chilikin K, Cho K, Choi SK, Choi Y, Cinabro D, Czank T, Dash N, Di Carlo S, Doležal Z, Dutta D, Eidelman S, Fast JE, Ferber T, Fulsom BG, Garg R, Gaur V, Gabyshev N, Garmash A, Gelb M, Goldenzweig P, Greenwald D, Guido E, Haba J, Hayasaka K, Hayashii H, Hedges MT, Hirose S, Hou WS, Iijima T, Inami K, Inguglia G, Ishikawa A, Itoh R, Iwasaki M, Jaegle I, Jeon HB, Jia S, Jin Y, Joo KK, Julius T, Kang KH, Karyan G, Kawasaki T, Kiesling C, Kim DY, Kim JB, Kim SH, Kim YJ, Kinoshita K, Kodyš P, Korpar S, Kotchetkov D, Križan P, Kroeger R, Krokovny P, Kulasiri R, Kuzmin A, Kwon YJ, Lange JS, Lee IS, Li LK, Li Y, Gioi LL, Libby J, Liventsev D, Masuda M, Merola M, Miyabayashi K, Miyata H, Mohanty GB, Moon HK, Mori T, Mussa R. Measurement of the τ Michel parameters η and ξκ in the radiative leptonic decay τ- → l- ντ νl γ. Progress of Theoretical and Experimental Physics. 2018 Feb 1;2018(2).
Published In
Progress of Theoretical and Experimental Physics
DOI
EISSN
2050-3911
Publication Date
February 1, 2018
Volume
2018
Issue
2
Related Subject Headings
- 51 Physical sciences
- 49 Mathematical sciences