Observation of tau-lepton decay to five charged particles

Journal Article · Mon Apr 22 04:00:00 EST 1985 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.54.1775· OSTI ID:5771183

Beltrami, I; Bylsma, B G; DeBonte, R; Gan, K K; Koltick, D; Loeffler, F J; Low, E H; McIlwain, R L; Miller, D H; Ng, C R; Ong, P P; Rangan, L K; Shibata, E I; Wilson, R J; Derrick, M; Fernandez, E; Fries, R; Hyman, L; Kooijman, P; Loos, J S ; Musgrave, B; Price, L E; Schlereth, J; Sugano, K; Weiss, J M; Wood, D E; Baranko, G; Baringer, P; Blockus, D; Brabson, B; Forden, G E; Gray, S W; Jung, C; Neal, H; Ogren, H; Rust, D R; Valdata-Nappi, M; Akerlof, C; Bonvicini, G; Chapman, J; Errede, D; Harnew, N; Kesten, P; Kooijman, S; Meyer, D I; Nitz, D; Rubin, D; Seidl, A A; Thun, R; Trinko, T; Willutzky, W; Cork, B; Keller, L; Va'Vra, J

The production of tau-lepton pairs in e/sup +/e/sup -/ collisions at 29 GeV has been used to study the inclusive tau decay into five charged particles. Ten events are observed in the high-resolution spectrometer giving a branching ratio of B(tau..-->..5..pi../sup + -/+n..gamma..+..nu../sub tau/) = (1.3 +- 0 .4) x 10/sup -3/. Five of the events contain photons which are consistent with coming from a single ..pi../sup 0/. With this interpretation we measure B(tau..-->..5..pi.. +- +..nu../sub tau/), B(tau..-->..5..pi../sup + -/+..pi../sup 0/+..nu../sub tau/) = (6.7 +- 3.0) x 10/sup -4/. The branching-ratio upper limit for the decay mode tau..-->..K/sup 0/+3..pi../sup + -/n..gamma..+..nu../sub tau/ is found, at 90% confidence level, to be 2.7 x 10/sup -3/.

• Research Organization: Purdue University, West Lafayette, Indiana 47907
• OSTI ID: 5771183
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 54:16; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DECAY
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRONS
HEAVY LEPTONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MASSLESS PARTICLES
MATRIX ELEMENTS
MESONS
NEUTRINOS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PEP STORAGE RINGS
PHOTONS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
STORAGE RINGS
TAU PARTICLES