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http://hdl.handle.net/2445/131392
Title: | Search for the decay τ− → 3π−2π+2π0ντ |
Author: | Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 9-Jun-2006 |
Publisher: | American Physical Society |
Abstract: | search for the decay of the τ lepton to five charged and two neutral pions is performed using data collected by the BABAR detector at the PEP-II asymmetric-energy e + e − collider. The analysis uses 232 fb − 1 of data at center-of-mass energies on or near the Υ ( 4 S ) resonance. We observe 10 events with an expected background of 6.5 + 2.0 − 1.4 events. In the absence of a signal, we set the limit on the branching ratio B ( τ − → 3 π − 2 π + 2 π 0 ν τ ) < 3.4 × 10 − 6 at the 90% confidence level. This is a significant improvement over the previously established limit. In addition, we search for the decay mode τ − → 2 ω π − ν τ . We observe 1 event with an expected background of 0.4 + 1.0 − 0.4 events and calculate the upper limit B ( τ − → 2 ω π − ν τ ) < 5.4 × 10 − 7 at the 90% confidence level. This is the first upper limit for this mode. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.73.112003 |
It is part of: | Physical Review D, 2006, vol. 73, num. 11, p. 112003 |
URI: | http://hdl.handle.net/2445/131392 |
Related resource: | https://doi.org/10.1103/PhysRevD.73.112003 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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