Phys. Rev. Lett.
86,
4467–4471
(2001)
Study of τ Decays to Six Pions and a Neutrino
A. Anastassov et al. (CLEO Collaboration)
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A. Anastassov1, J. E. Duboscq1, E. Eckhart1, K. K. Gan1, C. Gwon1, T. Hart1, K. Honscheid1, D. Hufnagel1, H. Kagan1, R. Kass1, T. K. Pedlar1, H. Schwarthoff1, J. B. Thayer1, E. von Toerne1, M. M. Zoeller1, S. J. Richichi2, H. Severini2, P. Skubic2, A. Undrus2, S. Chen3, J. Fast3, J. W. Hinson3, J. Lee3, D. H. Miller3, E. I. Shibata3, I. P. J. Shipsey3, V. Pavlunin3, D. Cronin-Hennessy4, A. L. Lyon4, E. H. Thorndike4, C. P. Jessop5, V. Savinov5, T. E. Coan6, V. Fadeyev6, Y. Maravin6, I. Narsky6, R. Stroynowski6, J. Ye6, T. Wlodek6, M. Artuso7, R. Ayad7, C. Boulahouache7, K. Bukin7, E. Dambasuren7, S. Karamov7, G. Majumder7, G. C. Moneti7, R. Mountain7, S. Schuh7, T. Skwarnicki7, S. Stone7, G. Viehhauser7, J. C. Wang7, A. Wolf7, J. Wu7, S. Kopp8, A. H. Mahmood9, S. E. Csorna10, I. Danko10, K. W. McLean10, Z. Xu10, R. Godang11, G. Bonvicini12, D. Cinabro12, M. Dubrovin12, S. McGee12, G. J. Zhou12, E. Lipeles13, S. P. Pappas13, M. Schmidtler13, A. Shapiro13, W. M. Sun13, A. J. Weinstein13, F. Würthwein13,*, D. E. Jaffe14, G. Masek14, H. P. Paar14, E. M. Potter14, S. Prell14, D. M. Asner15, A. Eppich15, T. S. Hill15, R. J. Morrison15, R. A. Briere16, G. P. Chen16, W. T. Ford17, A. Gritsan17, J. Roy17, J. G. Smith17, J. P. Alexander18, R. Baker18, C. Bebek18, B. E. Berger18, K. Berkelman18, F. Blanc18, V. Boisvert18, D. G. Cassel18, P. S. Drell18, K. M. Ecklund18, R. Ehrlich18, A. D. Foland18, P. Gaidarev18, R. S. Galik18, L. Gibbons18, B. Gittelman18, S. W. Gray18, D. L. Hartill18, B. K. Heltsley18, P. I. Hopman18, L. Hsu18, C. D. Jones18, D. L. Kreinick18, M. Lohner18, A. Magerkurth18, T. O. Meyer18, N. B. Mistry18, E. Nordberg18, J. R. Patterson18, D. Peterson18, D. Riley18, A. Romano18, J. G. Thayer18, D. Urner18, B. Valant-Spaight18, A. Warburton18, P. Avery19, C. Prescott19, A. I. Rubiera19, H. Stoeck19, J. Yelton19, G. Brandenburg20, A. Ershov20, Y. S. Gao20, D. Y.-J. Kim20, R. Wilson20, T. Bergfeld21, B. I. Eisenstein21, J. Ernst21, G. E. Gladding21, G. D. Gollin21, R. M. Hans21, E. Johnson21, I. Karliner21, M. A. Marsh21, M. Palmer21, C. Plager21, C. Sedlack21, M. Selen21, J. J. Thaler21, J. Williams21, K. W. Edwards22a,22b, R. Janicek23a,23b, P. M. Patel23a,23b, A. J. Sadoff24, R. Ammar25, A. Bean25, D. Besson25, X. Zhao25, S. Anderson26, V. V. Frolov26, Y. Kubota26, S. J. Lee26, R. Mahapatra26, J. J. O'Neill26, R. Poling26, T. Riehle26, A. Smith26, C. J. Stepaniak26, J. Urheim26, S. Ahmed27, M. S. Alam27, S. B. Athar27, L. Jian27, L. Ling27, M. Saleem27, S. Timm27, and F. Wappler27 (CLEO Collaboration)
1Ohio State University, Columbus, Ohio 43210
2University of Oklahoma, Norman, Oklahoma 73019
3Purdue University, West Lafayette, Indiana 47907
4University of Rochester, Rochester, New York 14627
5Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
6Southern Methodist University, Dallas, Texas 75275
7Syracuse University, Syracuse, New York 13244
8University of Texas, Austin, Texas 78712
9University of Texas–Pan American, Edinburg, Texas 78539
10Vanderbilt University, Nashville, Tennessee 37235
11Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
12Wayne State University, Detroit, Michigan 48202
13California Institute of Technology, Pasadena, California 91125
14University of California–San Diego, La Jolla, California 92093
15University of California, Santa Barbara, California 93106
16Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
17University of Colorado, Boulder, Colorado 80309-0390
18Cornell University, Ithaca, New York 14853
19University of Florida, Gainesville, Florida 32611
20Harvard University, Cambridge, Massachusetts 02138
21University of Illinois, Urbana-Champaign, Illinois 61801
22aCarleton University, Ottawa, Ontario, Canada K1S 5B6
22band Institute of Particle Physics, Canada
23aMcGill University, Montréal, Québec, Canada H3A 2T8
23band Institute of Particle Physics, Canada
24Ithaca College, Ithaca, New York 14850
25University of Kansas, Lawrence, Kansas 66045
26University of Minnesota, Minneapolis, Minnesota 55455
27State University of New York at Albany, Albany, New York 12222
Received 2 October 2000; published in the issue dated 14 May 2001
The τ decays to six-pion final states have been studied with the CLEO detector at the Cornell Electron Storage Ring. The measured branching fractions are B(τ-→2π-π+3π0ντ) = (2.2±0.3±0.4)×10-4 and B(τ-→3π-2π+π0ντ) = (1.7±0.2±0.2)×10-4. A search for substructure in these decays shows that they are saturated by intermediate states with η or ω mesons. We present the first observation of the decay τ-→2π-π+ωντ and the branching fraction is measured to be (1.2±0.2±0.1)×10-4. The measured branching fractions are in good agreement with the isospin expectations but somewhat below the conserved-vector-current predictions.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4467
DOI:
10.1103/PhysRevLett.86.4467
*Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
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