Search for the decay {tau}{sup -}{yields}4{pi}{sup -}3{pi}{sup +}({pi}{sup 0}){nu}{sub {tau}}
- Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
- IFAE, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona (Spain)
- Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
- Institute of High Energy Physics, Beijing 100039 (China)
- University of Bergen, Institute of Physics, N-5007 Bergen (Norway); and others
A search for the decay of the {tau} lepton to seven charged pions and one or zero {pi}{sup 0} mesons was performed using the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider. The analysis uses 232.2 fb{sup -1} of data at center-of-mass energies on or near the {upsilon}(4S) resonance. We observe 24 events with an expected background of 21.6{+-}1.3 events. Without evidence for a signal, we calculate an upper limit of B({tau}{sup -}{yields}4{pi}{sup -}3{pi}{sup +}({pi}{sup 0}){nu}{sub {tau}})<3.0x10{sup -7} at 90% confidence level. This is an improvement by nearly an order of magnitude over the previously established limit. In addition, we set upper limits for the exclusive decays {tau}{sup -}{yields}4{pi}{sup -}3{pi}{sup +}{nu}{sub {tau}} and {tau}{sup -}{yields}4{pi}{sup -}3{pi}{sup +}{pi}{sup 0}{nu}{sub {tau}}.
- OSTI ID:
- 20711030
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 72, Issue 1; Other Information: DOI: 10.1103/PhysRevD.72.012003; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); BABAR Collaboration; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Search for the decay {tau}{sup -}{yields}3{pi}{sup -}2{pi}{sup +}2{pi}{sup 0}{nu}{sub {tau}}
Studies of {tau}{sup -}{yields}{eta}K{sup -}{nu}{sub {tau}} and {tau}{sup -}{yields}{eta}{pi}{sup -}{nu}{sub {tau}} at BABAR and a search for a second-class current