Search for the Decay tau to seven pion (pizero)

Details Search for the Decay tau to seven pion (pizero) Search for the Decay tau to seven pion (pizero)

2005-06-02

arxiv.org/abs/hep-ex/0506007v1

Phys.Rev.D72:012003,2005

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevD.72.012003

A search for the decay of the tau lepton to seven charged pions and one or zero pizero mesons was performed using the BaBar detector at the PEP-II asymmetric-energy e+e- collider. The analysis uses 232.2 fb-1 of data at center-of-mass energies on or near the Y(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 BR(tau- --> 4pi- 3pi+ (pizero) nu_tau) < 3.0*10^-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- --> 4pi- 3pi+ nu_tau and tau- --> 4pi- 3pi+ pizero nu_tau.

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