Measurement of the kaon content of three-prong [tau] decays

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.R13· OSTI ID:7112531

Bauer, D A; Belcinski, R; Berg, R C; Bingham, H H; Bloom, E D; Buchanan, C D; Caldwell, D O; Chun, S; Clark, A R; Dahl, O I; Eastman, J J; Eberhard, P H; Eisner, A M; Fairfield, K H; Godfrey, G; Greenbaum, G S; Hauptman, J M; Hofmann, W; Holtzapple, R L; Khacheryan, S ; Knoepfle, K T; Kofler, R R; Lambert, D J; Loken, S C; Lu, A; Lynch, G R; Lys, J E; Madaras, R J; Marsiske, H; Masek, G E; Miller, E S; Nicol, N A; Nygren, D R; Oyang, Y; Paar, H P; Palounek, A P.T.; Pellett, D E; Ronan, M T; Ross, R R; Shapiro, G; Stephens, R W; Stevenson, M L; Strauss, M G; Sullivan, M K; Vernon, W; Wang, E M; Wang, Y; Wenzel, W A; Yamamoto, H; Yellin, S J; Yost, G P; Zapalac, G ^[1]

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1. University of California, Berkeley, California 94720 (United States) University of California, Davis, California 95616 (United States) University of California Intercampus Institute for Research at Particle Accelerators, Stanford, California 94305 (United States) University of

We present branching fraction measurements of three-prong decays of the [tau][sup [minus]] lepton based on data from the TPC/Two-Gamma detector at SLAC PEP. The decays are classified according to the identities of the charged tracks to give simultaneous measurements of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][pi][sup [minus]]]=0.58[sub [minus]0.13][sup +0.15]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][pi][sup [minus]]]=0.15[sub [minus]0.07][sup +0.09]%, and upper limits of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]][pi][sup [minus]][ital K][sup +][pi][sup [minus]]][lt]0.25%, [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][ital K][sup [minus]]][lt]0.09%, and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][ital K][sup [minus]]][lt]0.21%, where additional neutrals may be present in each case. The branching fractions are normalized to the world average three-prong topological branching fraction and there is an estimated 20% systematic error in addition to the listed statistical errors. We find the mass distributions in the [ital K][sup [minus]][pi][sup +][pi][sup [minus]] decay are consistent with [ital K][sub 1] dominance, and obtain branching fractions of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1270)]=0.41[sub [minus]0.35][sup +0.41]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1400)]=0.76[sub [minus]0.33][sup +0.40]%.

• DOE Contract Number: FG03-91ER40674; AS03-76ER70285; FG03-91ER40662; AT03-87ER40327
• OSTI ID: 7112531
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HEAVY LEPTONS
KAONS
LEPTONS
MASSLESS PARTICLES
MESONS
NEUTRINOS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
TAU NEUTRINOS
TAU PARTICLES