Phys. Rev. D
47,
R3671–R3675
(1993)
Measurement of the τ-lepton mass
R. Balest et al. (CLEO Collaboration)
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R. Balest1, M. Daoudi1, W. T. Ford1, D. R. Johnson1, K. Lingel1, M. Lohner1, P. Rankin1, J. G. Smith1, J. P. Alexander2, C. Bebek2, K. Berkelman2, D. Besson2, T. E. Browder2, D. G. Cassel2, H. A. Cho2, D. M. Coffman2, P. S. Drell2, R. Ehrlich2, R. S. Galik2, M. Garcia-Sciveres2, B. Geiser2, B. Gittelman2, S. W. Gray2, D. L. Hartill2, B. K. Heltsley2, K. Honscheid2, C. D. Jones2, J. Kandaswamy2, N. Katayama2, P. C. Kim2, D. L. Kreinick2, G. S. Ludwig2, J. Masui2, J. Mevissen2, N. B. Mistry2, C. R. Ng2, E. Nordberg2, M. Ogg2,*, C. O'Grady2, J. R. Patterson2, D. Peterson2, D. Riley2, M. Sapper2, M. Selen2, H. Worden2, M. Worris2, F. Würthwein2, P. Avery3, A. Freyberger3, J. Rodriguez3, R. Stephens3, J. Yelton3, D. Cinabro4, S. Henderson4, K. Kinoshita4, T. Liu4, M. Saulnier4, R. Wilson4, H. Yamamoto4, A. J. Sadoff5, R. Ammar6, S. Ball6, P. Baringer6, D. Coppage6, N. Copty6, R. Davis6, N. Hancock6, M. Kelly6, N. Kwak6, H. Lam6, Y. Kubota7, M. Lattery7, J. K. Nelson7, S. Patton7, D. Perticone7, R. Poling7, V. Savinov7, S. Schrenk7, R. Wang7, M. S. Alam8, I. J. Kim8, B. Nemati8, J. J. O'Neill8, V. Romero8, H. Severini8, C. R. Sun8, M. M. Zoeller8, G. Crawford9, R. Fulton9, K. K. Gan9, H. Kagan9, R. Kass9, J. Lee9, R. Malchow9, F. Morrow9, Y. Skovpen9,†, M. Sung9, C. White9, J. Whitmore9, P. Wilson9, F. Butler10, X. Fu10, G. Kalbfleisch10, M. Lambrecht10, W. R. Ross10, P. Skubic10, J. Snow10, P. L. Wang10, M. Wood10, D. Bortoletto11, D. N. Brown11, J. Dominick11, R. L. McIlwain11, T. Miao11, D. H. Miller11, M. Modesitt11, S. F. Schaffner11, E. I. Shibata11, I. P. J. Shipsey11, P. N. Wang11, M. Battle12, J. Ernst12, H. Kroha12, S. Roberts12, K. Sparks12, E. H. Thorndike12, C. H. Wang12, S. Sanghera13, T. Skwarnicki13, R. Stroynowski13, M. Artuso14, M. Goldberg14, N. Horwitz14, R. Kennett14, G. C. Moneti14, F. Muheim14, S. Playfer14, Y. Rozen14, P. Rubin14, S. Stone14, M. Thulasidas14, G. Zhu14, A. V. Barnes15, J. Bartelt15, S. E. Csorna15, Z. Egyed15, V. Jain15, P. Sheldon15, D. S. Akerib16, B. Barish16, M. Chadha16, S. Chan16, D. F. Cowen16, G. Eigen16, J. S. Miller16, J. Urheim16, A. J. Weinstein16, D. Acosta17, M. Athanas17, G. Masek17, B. Ong17, H. Paar17, M. Sivertz17, A. Bean18, J. Gronberg18, R. Kutschke18, S. Menary18, R. J. Morrison18, H. N. Nelson18, J. D. Richman18, H. Tajima18, D. Schmidt18, M. S. Witherell18, M. Procario19, and S. Yang19 (CLEO Collaboration)
1University of Colorado, Boulder, Colorado 80309-0390
2Cornell University, Ithaca, New York 14853
3University of Florida, Gainesville, Florida 32611
4Harvard University, Cambridge, Massachusetts 02138
5Ithaca College, Ithaca, New York 14850
6University of Kansas, Lawrence, Kansas 66045
7University of Minnesota, Minneapolis, Minnesota 55455
8State University of New York at Albany, Albany, New York 12222
9Ohio State University, Columbus, Ohio 43210
10University of Oklahoma, Norman, Oklahoma 73019
11Purdue University, West Lafayette, Indiana 47907
12University of Rochester, Rochester, New York 14627
13Southern Methodist University, Dallas, Texas 75275
14Syracuse University, Syracuse, New York 13244
15Vanderbilt University, Nashville, Tennessee 37235
16California Institute of Technology, Pasadena, California 91125
17University of California, La Jolla, California 92093
18University of California, Santa Barbara, California 93106
19Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
Received 9 February 1993; published in the issue dated 1 May 1993
Using data from the CLEO II detector at CESR, we measure the τ-lepton mass by exploiting the unique kinematics of events in which both τ's decay hadronically. The result is mτ=1777.8±0.7±1.7 MeV/c2. By comparing our result with other measurements near τ-pair threshold, we extract an upper limit on the τ-neutrino mass of 75 MeV/c2 at 95% confidence level.
© 1993 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.47.R3671
DOI:
10.1103/PhysRevD.47.R3671
PACS:
12.15.Ff, 13.35.+s, 14.60.Jj
*Permanent address: Carleton University, Ottawa, Canada. †Permanent address: INP, Novosibirsk, Russia.
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