Search for the decay {tau}{sup -}{yields}3{pi}{sup -}2{pi}{sup +}2{pi}{sup 0}{nu}{sub {tau}}

Journal Article · Thu Jun 01 00:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.73.112003· OSTI ID:20774775

Aubert, B; Barate, R; Bona, M; Boutigny, D; Couderc, F; Karyotakis, Y; Lees, J P; Poireau, V; Tisserand, V; Zghiche, A ^[1]; Grauges, E ^[2]; Palano, A; Pappagallo, M ^[3]; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S ^[4]; Eigen, G; Ofte, I ^[5]

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1. Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
2. Universitat de Barcelona Fac. Fisica. Dept. ECM Avda Diagonal 647, 6a planta E-08028 Barcelona (Spain)
3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
4. Institute of High Energy Physics, Beijing 100039 (China)
5. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)

A search for the decay of the {tau} lepton to five charged and two neutral pions is performed using data collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider. The analysis uses 232 fb{sup -1} of data at center-of-mass energies on or near the {upsilon}(4S) resonance. We observe 10 events with an expected background of 6.5{sub -1.4}{sup +2.0} events. In the absence of a signal, we set the limit on the branching ratio B({tau}{sup -}{yields}3{pi}{sup -}2{pi}{sup +}2{pi}{sup 0}{nu}{sub {tau}})<3.4x10{sup -6} at the 90% confidence level. This is a significant improvement over the previously established limit. In addition, we search for the decay mode {tau}{sup -}{yields}2{omega}{pi}{sup -}{nu}{sub {tau}}. We observe 1 event with an expected background of 0.4(+1.0/-0.4) events and calculate the upper limit B({tau}{sup -}{yields}2{omega}{pi}{sup -}{nu}{sub {tau}})<5.4x10{sup -7} at the 90% confidence level. This is the first upper limit for this mode.

• OSTI ID: 20774775
• Journal Information: Physical Review. D, Particles Fields, Vol. 73, Issue 11; Other Information: DOI: 10.1103/PhysRevD.73.112003; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BRANCHING RATIO
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
MULTIPARTICLE SPECTROMETERS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
PIONS NEUTRAL
TAU NEUTRINOS
TAU PARTICLES
UPSILON-10580 MESONS