Measurement of tau branching ratios

We have measured the branching ratios for several tau decay modes. We use e/sup +/e/sup -/..-->..tau/sup +/tau/sup -/ events accumulated with the TPC/Two-Gamma facility at the SLAC e/sup +/e/sup -/ storage ring PEP. The data correspond to an integrated luminosity of 77 pb/sup -1/ at a center-of-m...

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Veröffentlicht in:	Phys. Rev. D; (United States) 1987-03, Vol.35 (5), p.1553-1561
Hauptverfasser:	Aihara, H, Alston-Garnjost, M, Avery, RE, Bakken, JA, Barbaro-Galtieri, A, Barker, AR, Barnes, AV, Barnett, BA, Bauer, DA, Bengtsson, H, Bintinger, DL, Bobbink, GJ, Bolognese, TS, Bross, AD, Buchanan, CD, Buijs, A, Caldwell, DO, Chien, CY, Clark, AR, Cowan, GD, Crane, DA, Dahl, OI, Derby, KA, Eastman, JJ, Edberg, TK, Eberhard, PH, Eisner, AM, Enomoto, R, Erné, FC, Fujii, T, Gary, JW, Gorn, W, Hauptman, JM, Hofmann, W, Huth, JE, Hylen, J, Kamae, T, Kaye, HS, Kees, KH, Kenney, RW, Kerth, LT, Ko, W, Koda, RI, Kofler, RR, Kwong, KK, Lander, RL, Langeveld, WG, Layter, JG, Linde, FL, Lindsey, CS, Loken, SC, Lu, A, Lu, XQ, Lynch, GR, Madansky, L, Madaras, RJ, Maeshima, K, Magnuson, BD, Marx, JN, Masek, GE, Mathis, LG, Matthews, JA, Maxfield, SJ
Format:	Artikel
Sprache:	eng
Schlagworte:	BASIC INTERACTIONS BOSONS BRANCHING RATIO DATA DECAY ELECTRON-POSITRON INTERACTIONS ELECTRONS ELEMENTARY PARTICLES EXPERIMENTAL DATA FERMIONS HADRONS HEAVY LEPTONS INFORMATION INTERACTIONS K-892 RESONANCES KAONS KAONS MINUS LEPTON-LEPTON INTERACTIONS LEPTONIC DECAY LEPTONS MESONS MUONS MUONS MINUS NUMERICAL DATA PARTICLE DECAY PARTICLE INTERACTIONS PEP STORAGE RINGS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS PIONS MINUS PIONS NEUTRAL POSTULATED PARTICLES PSEUDOSCALAR MESONS SEMILEPTONIC DECAY STORAGE RINGS STRANGE MESONS STRANGE PARTICLES TAU PARTICLES WEAK INTERACTIONS WEAK PARTICLE DECAY 645102 > High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
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Zusammenfassung:	We have measured the branching ratios for several tau decay modes. We use e/sup +/e/sup -/..-->..tau/sup +/tau/sup -/ events accumulated with the TPC/Two-Gamma facility at the SLAC e/sup +/e/sup -/ storage ring PEP. The data correspond to an integrated luminosity of 77 pb/sup -1/ at a center-of-mass energy of 29 GeV. The one- and three-charged-particle inclusive branching ratios of the tau decay are measured to be B/sub 1/ = (84.7 +- 1.0)% and B/sub 3/ = (15.1 +- 1.0)%, where B/sub 1/+B/sub 3/ is constrained to be 99.85%. The branching ratios of the two leptonic decay modes are B(tau/sup -/..-->..e/sup -/ nu-bar/sub e/..nu../sub tau/) = (18.4 +- 1.6)% and B(tau/sup -/..--> mu../sup -/ nu-bar/sub ..mu../..nu../sub tau/) = (17.7 +- 1.4)%. If we then assume lepton universality, we obtain B(tau/sup -/..-->..e/sup -/ nu-bar/sub e/..nu../sub tau/) = (18.3 +- 0.9)% and B(tau/sup -/..--> mu../sup -/ nu-bar/sub ..mu../..nu../sub tau/) = (17.8 +- 0.9)%. We measure the Cabibbo-allowed semihadronic decay mode B(tau/sup -/..--> pi../sup -/+neutral particles) = (47.0 +- 1.5)%, and the Cabibbo-suppressed tau decay mode B(tau/sup -/..-->..K/sup -/+neutral particles) = (1.6 +- 0.4)%. By looking for associated photons, we find B(tau/sup -/..-->..K/sup -/..pi../sup 0/+neutral particles) to be (1.2 +- 0.6)%.
ISSN:	0556-2821
DOI:	10.1103/PhysRevD.35.1553