Measurement of Cabibbo-suppressed decays of the [tau] lepton

Branching ratios for the dominant Cabibbo-suppressed decays of the [tau] lepton have been measured by CLEO II in [ital e][sup +][ital e][sup [minus]] annihilation at the Cornell Electron Storage Ring ([radical][ital s] [similar to]10.6 GeV) using kaons with momenta below 0.7 GeV/[ital c]. The inclus...

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Bibliographic Details
Published in:Physical review letters 1994-08, Vol.73:8
Main Authors: Battle, M., Ernst, J., Kwon, Y., Roberts, S., Thorndike, E.H., Wang, C.H., Dominick, J., Lambrecht, M., Sanghera, S., Shelkov, V., Skwarnicki, T., Stroynowski, R., Volobouev, I., Wei, G., Zadorozhny, P., Artuso, M., Goldberg, M., He, D., Horwitz, N., Kennett, R., Mountain, R., Moneti, G.C., Muheim, F., Mukhin, Y., Playfer, S., Rozen, Y., Stone, S., Thulasidas, M., Vasseur, G., Zhu, G., Bartelt, J., Csorna, S.E., Egyed, Z., Jain, V., Kinoshita, K., Edwards, K.W., Ogg, M., Britton, D.I., Hyatt, E.R.F., MacFarlane, D.B., Patel, P.M., Akerib, D.S., 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., Sivertz, M., 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., Ra
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
KAONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES
TAU PARTICLES
WEAK PARTICLE DECAY
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Summary:Branching ratios for the dominant Cabibbo-suppressed decays of the [tau] lepton have been measured by CLEO II in [ital e][sup +][ital e][sup [minus]] annihilation at the Cornell Electron Storage Ring ([radical][ital s] [similar to]10.6 GeV) using kaons with momenta below 0.7 GeV/[ital c]. The inclusive branching ratio into one charged kaon is (1.60[plus minus]0.12[plus minus]0.19)%. For the exclusive decays, [ital B]([tau][sup [minus]][r arrow][ital K][sup [minus]][nu][sub [tau]])=(0.66[plus minus]0.07[plus minus]0.09)%, [ital B]([tau][sup [minus]][r arrow][ital K][sup [minus]][pi][sup 0][nu][sub [tau]])=(0.51 [plus minus]0.10[plus minus]0.07)%, and, based on three events, [ital B]([tau][sup [minus]][r arrow][ital K][sup [minus]]2[pi][sup 0][nu][sub [tau]])[lt]0.3% at the 90% confidence level. These represent significant improvements over previous results. [ital B]([tau][sup [minus]][r arrow][ital K][sup [minus]][pi][sup 0][nu][sub [tau]]) is measured for the first time with exclusive [pi][sup 0] reconstruction.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.73.1079