Observation of tau -lepton decay to five charged particles

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/)...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1985-04, Vol.54 (16), p.1775-1778
Hauptverfasser:	Beltrami, I, I, Bylsma, BG, DeBonte, R, Gan, KK, Koltick, D, Loeffler, FJ, Low, EH, McIlwain, RL, Miller, DH, Ng, CR, Ong, PP, Rangan, LK, Shibata, EI, Wilson, RJ, Derrick, M, Fernandez, E, Fries, R, Hyman, L, Kooijman, P, Loos, JS, Musgrave, B, Price, LE, Schlereth, J, Sugano, K, Weiss, JM, Wood, DE, Baranko, G, Baringer, P, Blockus, D, Brabson, B, Forden, GE, Gray, SW, Jung, C, Neal, H, Ogren, H, Rust, DR, Valdata-Nappi, M, Akerlof, C, Bonvicini, G, Chapman, J, Errede, D, Harnew, N, Kesten, P, Kooijman, S, Meyer, DI, Nitz, D, Rubin, D, Seidl, AA, Thun, R, Trinko, T, Willutzky, W, Cork, B, Keller, L, Va'Vra, J
Format:	Artikel
Sprache:	eng
Schlagworte:	645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties 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 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS POSTULATED PARTICLES PSEUDOSCALAR MESONS STORAGE RINGS TAU PARTICLES
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Beschreibung
Zusammenfassung:	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/.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.54.1775