Phys. Rev. Lett.
94,
241802
(2005)
[5 pages]
Study of τ Decays to Four-Hadron Final States with Kaons
K. Arms et al. CLEO Collaboration
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K. Arms1, K. K. Gan1, H. Severini2, D. M. Asner3, S. A. Dytman3, W. Love3, S. Mehrabyan3, J. A. Mueller3, V. Savinov3, Z. Li4, A. Lopez4, H. Mendez4, J. Ramirez4, G. S. Huang5, D. H. Miller5, V. Pavlunin5, B. Sanghi5, E. I. Shibata5, I. P. J. Shipsey5, G. S. Adams6, M. Chasse6, M. Cravey6, J. P. Cummings6, I. Danko6, J. Napolitano6, H. Muramatsu7, C. S. Park7, W. Park7, J. B. Thayer7, E. H. Thorndike7, T. E. Coan8, Y. S. Gao8, F. Liu8, R. Stroynowski8, M. Artuso9, C. Boulahouache9, S. Blusk9, J. Butt9, E. Dambasuren9, O. Dorjkhaidav9, J. Li9, N. Menaa9, R. Mountain9, R. Nandakumar9, R. Redjimi9, R. Sia9, T. Skwarnicki9, S. Stone9, J. C. Wang9, K. Zhang9, S. E. Csorna10, G. Bonvicini11, D. Cinabro11, M. Dubrovin11, A. Bornheim12, S. P. Pappas12, A. J. Weinstein12, R. A. Briere13, G. P. Chen13, T. Ferguson13, G. Tatishvili13, H. Vogel13, M. E. Watkins13, J. L. Rosner14, N. E. Adam15, J. P. Alexander15, K. Berkelman15, D. G. Cassel15, V. Crede15, J. E. Duboscq15, K. M. Ecklund15, R. Ehrlich15, L. Fields15, R. S. Galik15, L. Gibbons15, B. Gittelman15, R. Gray15, S. W. Gray15, D. L. Hartill15, B. K. Heltsley15, D. Hertz15, L. Hsu15, C. D. Jones15, J. Kandaswamy15, D. L. Kreinick15, V. E. Kuznetsov15, H. Mahlke-Krüger15, T. O. Meyer15, P. U. E. Onyisi15, J. R. Patterson15, D. Peterson15, J. Pivarski15, D. Riley15, A. Ryd15, A. J. Sadoff15, H. Schwarthoff15, M. R. Shepherd15, S. Stroiney15, W. M. Sun15, J. G. Thayer15, D. Urner15, T. Wilksen15, M. Weinberger15, S. B. Athar16, P. Avery16, L. Breva-Newell16, R. Patel16, V. Potlia16, H. Stoeck16, J. Yelton16, P. Rubin17, C. Cawlfield18, B. I. Eisenstein18, G. D. Gollin18, I. Karliner18, D. Kim18, N. Lowrey18, P. Naik18, C. Sedlack18, M. Selen18, J. Williams18, J. Wiss18, K. W. Edwards19, D. Besson20, T. K. Pedlar21, D. Cronin-Hennessy22, K. Y. Gao22, D. T. Gong22, Y. Kubota22, T. Klein22, B. W. Lang22, S. Z. Li22, R. Poling22, A. W. Scott23, A. Smith22, C. J. Stepaniak22, J. Urheim22,*, S. Dobbs23, Z. Metreveli23, K. K. Seth24, A. Tomaradze23, P. Zweber23, J. Ernst24, and A. H. Mahmood24 (CLEO Collaboration)
1Ohio State University, Columbus, Ohio 43210, USA
2University of Oklahoma, Norman, Oklahoma 73019, USA
3University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
4University of Puerto Rico, Mayaguez, Puerto Rico 00681
5Purdue University, West Lafayette, Indiana 47907, USA
6Rensselaer Polytechnic Institute, Troy, New York 12180, USA
7University of Rochester, Rochester, New York 14627, USA
8Southern Methodist University, Dallas, Texas 75275, USA
9Syracuse University, Syracuse, New York 13244, USA
10Vanderbilt University, Nashville, Tennessee 37235, USA
11Wayne State University, Detroit, Michigan 48202, USA
12California Institute of Technology, Pasadena, California 91125, USA
13Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
14Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
15Cornell University, Ithaca, New York 14853
16University of Florida, Gainesville, Florida 32611, USA
17George Mason University, Fairfax, Virginia 22030, USA
18University of Illinois, Urbana-Champaign, Illinois 61801, USA
19Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
20University of Kansas, Lawrence, Kansas 66045, USA
21Luther College, Decorah, Iowa 52101, USA
22University of Minnesota, Minneapolis, Minnesota 55455, USA
23Northwestern University, Evanston, Illinois 60208, USA
24State University of New York at Albany, Albany, New York 12222, USA
Received 14 January 2005; published 24 June 2005
The rare τ lepton decays to four explicitly identified hadrons have been studied with the CLEO detector at the Cornell Electron Storage Ring using (7.56±0.15) fb-1 of data collected near √s=10.58 GeV. The first statistically significant measurements of B(τ-→K-π+π-π0ντ,excluding K0)=(7.4±0.8±1.1)×10-4 and B(τ-→K-K+π-π0ντ)=(5.5±1.4±1.2)×10-5 are presented, including the first observation of the decay τ-→K-ωντ with branching fraction, (4.1±0.6±0.7)×10-4. We publish the first upper limit for B(τ-→K-K+K-π0ντ)<4.8(6.1)×10-6 at 90% (95%) confidence level. We measure for the first time the invariant mass distributions, which together with the branching fraction measurements are important ingredients that can be used to extract the standard model parameters, the strange quark mass, and the Cabibbo-Kobayashi-Maskawa element Vus.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.241802
DOI:
10.1103/PhysRevLett.94.241802
*Permanent address: Indiana University, Bloomington, IN 47405-7105, USA.
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