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## Study of high-multiplicity three-prong and five-prong tau decays at BABAR

### Abstract

See paper for full ist of authorsWe present measurements of the branching fractions of 3-prong and 5-prong tau decay modes using a sample of 430 million tau lepton pairs, corresponding to an integrated luminosity of 468 fb-1, collected with the BaBar detector at the PEP-II asymmetric energy e+e- storage rings. The \tau- --> (3\pi)- \eta \nu, \tau- --> (3\pi)- \omega \nu, and \tau- --> \pi- f_1(1285)\nu, branching fractions are presented as well as a new limit on the branching fraction of the isospin-forbidden, second-class current, \tau- --> \pi-\eta'(958)\nu, decay. We find no evidence for charged kaons in these decay modes and place the first upper limits on their branching fractions

Topics: [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2012
DOI identifier: 10.1103/PhysRevD.86.092010
OAI identifier: oai:HAL:in2p3-00732411v1
Provided by: Hal-Diderot