Search for the Decay tau- --> 3pi- 2pi+ 2pi0 nu_tau

Details Search for the Decay tau- --> 3pi- 2pi+ 2pi0 nu_tau Search for the Decay tau- --> 3pi- 2pi+ 2pi0 nu_tau

2006-04-06

arxiv.org/abs/hep-ex/0604014v1

Phys.Rev.D73:112003,2006

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 5 postscript figues, submitted to Phys. Rev. D (Rapid Communications)

Scientific paper

10.1103/PhysRevD.73.112003

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+e- collider. The analysis uses 232 fb-1 of data at center-of-mass energies on or near the Y(4S) 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(tau- --> 3pi- 2pi+ 2pi0 nu_tau) < 3.4x10^{-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- --> 2omega pi- nu_tau. We observe 1 event with an expected background of 0.4^{+1.0}_{-0.4} events and calculate the upper limit B(tau- --> 2omega pi- nu_tau) < 5.4x10^{-7} at the 90% confidence level. This is the first upper limit for this mode.

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