A Measurement of the Michel Parameters in Leptonic Decays of the Tau

R. Ammar; P. Baringer; A. Bean; D. Besson; D. Coppage; C. Darling; R. Davis; N. Hancock; S. Kotov; I. Kravchenko; N. Kwak; S. Anderson; Y. Kubota; M. Lattery; J. J. O’Neill; S. Patton; R. Poling; T. Riehle; V. Savinov; A. Smith; M. S. Alam; S. B. Athar; Z. Ling; A. H. Mahmood; H. Severini; S. Timm; F. Wappler; A. Anastassov; S. Blinov; J. E. Duboscq; D. Fujino; R. Fulton; K. K. Gan; T. Hart; K. Honscheid; H. Kagan; R. Kass; J. Lee; M. B. Spencer; M. Sung; A. Undrus; R. Wanke; A. Wolf; M. M. Zoeller; B. Nemati; S. J. Richichi; W. R. Ross; P. Skubic; M. Wood; M. Bishai; CLEO Collaboration

doi:10.1103/PhysRevLett.78.4686

A Measurement of the Michel Parameters in Leptonic Decays of the Tau

R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, C. Darling, R. Davis, N. Hancock, S. Kotov, I. Kravchenko, N. Kwak, S. Anderson, Y. Kubota, M. Lattery, J. J. O’Neill, S. Patton, R. Poling, T. Riehle, V. Savinov, A. SmithM. S. Alam, S. B. Athar, Z. Ling, A. H. Mahmood, H. Severini, S. Timm, F. Wappler, A. Anastassov, S. Blinov, J. E. Duboscq, D. Fujino, R. Fulton, K. K. Gan, T. Hart, K. Honscheid, H. Kagan, R. Kass, J. Lee, M. B. Spencer, M. Sung, A. Undrus, R. Wanke, A. Wolf, M. M. Zoeller, B. Nemati, S. J. Richichi, W. R. Ross, P. Skubic, M. Wood, M. Bishai, CLEO Collaboration

Physics and Astronomy (Twin Cities)

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Abstract

We have measured the spectral shape Michel parameters ρ and η using leptonic decays of the τ, recorded by the CLEO II detector. Assuming e - μ universality in the vectorlike couplings, we find ρ_eμ = 0.735 ± 0.013 ± 0.008, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately.

Original language	English (US)
Pages (from-to)	4686-4690
Number of pages	5
Journal	Physical review letters
Volume	78
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.78.4686
State	Published - Jun 23 1997

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Ammar, R., Baringer, P., Bean, A., Besson, D., Coppage, D., Darling, C., Davis, R., Hancock, N., Kotov, S., Kravchenko, I., Kwak, N., Anderson, S., Kubota, Y., Lattery, M., O’Neill, J. J., Patton, S., Poling, R., Riehle, T., Savinov, V., ... CLEO Collaboration (1997). A Measurement of the Michel Parameters in Leptonic Decays of the Tau. Physical review letters, 78(25), 4686-4690. https://doi.org/10.1103/PhysRevLett.78.4686

Ammar, R, Baringer, P, Bean, A, Besson, D, Coppage, D, Darling, C, Davis, R, Hancock, N, Kotov, S, Kravchenko, I, Kwak, N, Anderson, S, Kubota, Y, Lattery, M, O’Neill, JJ, Patton, S, Poling, R, Riehle, T, Savinov, V, Smith, A, Alam, MS, Athar, SB, Ling, Z, Mahmood, AH, Severini, H, Timm, S, Wappler, F, Anastassov, A, Blinov, S, Duboscq, JE, Fujino, D, Fulton, R, Gan, KK, Hart, T, Honscheid, K, Kagan, H, Kass, R, Lee, J, Spencer, MB, Sung, M, Undrus, A, Wanke, R, Wolf, A, Zoeller, MM, Nemati, B, Richichi, SJ, Ross, WR, Skubic, P, Wood, M, Bishai, M & CLEO Collaboration 1997, 'A Measurement of the Michel Parameters in Leptonic Decays of the Tau', Physical review letters, vol. 78, no. 25, pp. 4686-4690. https://doi.org/10.1103/PhysRevLett.78.4686

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abstract = "We have measured the spectral shape Michel parameters ρ and η using leptonic decays of the τ, recorded by the CLEO II detector. Assuming e - μ universality in the vectorlike couplings, we find ρeμ = 0.735 ± 0.013 ± 0.008, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately.",

author = "R. Ammar and P. Baringer and A. Bean and D. Besson and D. Coppage and C. Darling and R. Davis and N. Hancock and S. Kotov and I. Kravchenko and N. Kwak and S. Anderson and Y. Kubota and M. Lattery and O{\textquoteright}Neill, {J. J.} and S. Patton and R. Poling and T. Riehle and V. Savinov and A. Smith and Alam, {M. S.} and Athar, {S. B.} and Z. Ling and Mahmood, {A. H.} and H. Severini and S. Timm and F. Wappler and A. Anastassov and S. Blinov and Duboscq, {J. E.} and D. Fujino and R. Fulton and Gan, {K. K.} and T. Hart and K. Honscheid and H. Kagan and R. Kass and J. Lee and Spencer, {M. B.} and M. Sung and A. Undrus and R. Wanke and A. Wolf and Zoeller, {M. M.} and B. Nemati and Richichi, {S. J.} and Ross, {W. R.} and P. Skubic and M. Wood and M. Bishai and {CLEO Collaboration}",

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AU - Ammar, R.

AU - Baringer, P.

AU - Bean, A.

AU - Besson, D.

AU - Coppage, D.

AU - Darling, C.

AU - Davis, R.

AU - Hancock, N.

AU - Kotov, S.

AU - Kravchenko, I.

AU - Kwak, N.

AU - Anderson, S.

AU - Kubota, Y.

AU - Lattery, M.

AU - O’Neill, J. J.

AU - Patton, S.

AU - Poling, R.

AU - Riehle, T.

AU - Savinov, V.

AU - Smith, A.

AU - Alam, M. S.

AU - Athar, S. B.

AU - Ling, Z.

AU - Mahmood, A. H.

AU - Severini, H.

AU - Timm, S.

AU - Wappler, F.

AU - Anastassov, A.

AU - Blinov, S.

AU - Duboscq, J. E.

AU - Fujino, D.

AU - Fulton, R.

AU - Gan, K. K.

AU - Hart, T.

AU - Honscheid, K.

AU - Kagan, H.

AU - Kass, R.

AU - Lee, J.

AU - Spencer, M. B.

AU - Sung, M.

AU - Undrus, A.

AU - Wanke, R.

AU - Wolf, A.

AU - Zoeller, M. M.

AU - Nemati, B.

AU - Richichi, S. J.

AU - Ross, W. R.

AU - Skubic, P.

AU - Wood, M.

AU - Bishai, M.

AU - CLEO Collaboration

PY - 1997/6/23

Y1 - 1997/6/23

N2 - We have measured the spectral shape Michel parameters ρ and η using leptonic decays of the τ, recorded by the CLEO II detector. Assuming e - μ universality in the vectorlike couplings, we find ρeμ = 0.735 ± 0.013 ± 0.008, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately.

AB - We have measured the spectral shape Michel parameters ρ and η using leptonic decays of the τ, recorded by the CLEO II detector. Assuming e - μ universality in the vectorlike couplings, we find ρeμ = 0.735 ± 0.013 ± 0.008, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately.

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JO - Physical review letters

JF - Physical review letters

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ER -

A Measurement of the Michel Parameters in Leptonic Decays of the Tau

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