Study of the five-charged-pion decay of the [tau] lepton

The branching fractions for the five-charged-particle decays of the [tau] lepton have been measured in [ital e][sup +][ital e][sup [minus]] annihilations using the CLEO II detector at the Cornell Electron Storage Ring. Assuming all charged particles to be pions, the results are [ital B](3[pi][sup [m...

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Bibliographic Details
Published in:Physical review letters 1994-08, Vol.73:7
Main Authors: Gibaut, D., Kinoshita, K., Barish, B., Chadha, M., Chan, S., Cowen, D.F., Eigen, G., Miller, J.S., O'Grady, C., Urheim, J., Weinstein, A.J., Acosta, D., Athanas, M., Masek, G., Paar, H.P., Gronberg, J., Kutschke, R., Menary, S., Morrison, R.J., Nakanishi, S., Nelson, H.N., Nelson, T.K., Qiao, C., Richman, J.D., Ryd, A., Tajima, H., Sperka, D., Witherell, M.S., Procario, M., Balest, R., Cho, K., Daoudi, M., Ford, W.T., Johnson, D.R., Lingel, K., Lohner, M., Rankin, P., Smith, J.G., Alexander, J.P., Bebek, C., Berkelman, K., Bloom, K., Browder, T.E., Cassel, D.G., Cho, H.A., Coffman, D.M., Crowcroft, D.S., Drell, P.S., Ehrlich, R., Gaidarev, P., Galik, R.S., Garcia-Sciveres, M., Geiser, B., Gittelman, B., Gray, S.W., Hartill, D.L., Heltsley, B.K., Jones, C.D., Jones, S.L., Kandaswamy, J., Katayama, N., Kim, P.C., Kreinick, D.L., Ludwig, G.S., Masui, J., Mevissen, J., Mistry, N.B., Ng, C.R., Nordberg, E., Patterson, J.R., Peterson, D., Riley, D., Salman, S., Sapper, M., Wuerthwein, F., Av
Format: Article
Language:English
Subjects:
662370 - Decays of Leptons- (1992-)
BOSONS
BRANCHING RATIO
CHARGED PARTICLES
DECAY
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HEAVY LEPTONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
TAU PARTICLES
WEAK PARTICLE DECAY
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Summary:The branching fractions for the five-charged-particle decays of the [tau] lepton have been measured in [ital e][sup +][ital e][sup [minus]] annihilations using the CLEO II detector at the Cornell Electron Storage Ring. Assuming all charged particles to be pions, the results are [ital B](3[pi][sup [minus]]2[pi][sup +][ge]0 neutrals [nu][sub [tau]])=(0.097[plus minus]0.005[plus minus]0.011)%, [ital B](3[pi][sup [minus]]2[pi][sup +][nu][sub [tau]])=(0.077[plus minus]0.005 [plus minus]0.009)%, [ital B](3[pi][sup [minus]]2[pi][sup +][pi][sup 0][nu][sub [tau]])=(0.019[plus minus]0.004[plus minus]0.004)%, and [ital B](3[pi][sup [minus]]2[pi][sup +]2[pi][sup 0][nu][sub [tau]])[lt]0.011% at the 90% C.L. [ital B](3[pi][sup [minus]]2[pi][sup [minus]][pi][sup 0][nu][sub [tau]]) is measured for the first time by exclusive [pi][sup 0] reconstruction. The results are compared with the predictions from the partially conserved-axial-current and conserved-vector-current hypotheses assuming isospin invariance.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.73.934