(2008) Measurement of the tau(-)->eta pi(-) pi(+) pi(-) nu(tau) branching fraction and a search for a second-class current in the tau(-)->eta '(958)pi(-)nu(tau) decay. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.77 (No.11). Article No. 112002 . ISSN 1550-7998

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Abstract

The tau(-) -> eta pi(-) pi(+) pi(-) nu(tau) decay with the eta -> gamma gamma mode is studied using 384 fb(-1) of data collected by the BABAR detector. The branching fraction is measured to be (1.60 +/- 0.05 +/- 0.11) x 10(-4). It is found that tau(-) -> f(1) (1285) pi(-)nu(tau) -> eta pi(-) pi(+) pi(-) nu(tau) is the dominant decay mode with a branching fraction of (1.11 +/- 0.06 +/- 0.05) x 10(-4). The first error on the branching fractions is statistical and the second systematic. Note that no particle identification algorithm is applied to the charged tracks to distinguish pions from kaons. In addition, a 90% confidence level upper limit on the branching fraction of the tau(-) -> eta(')(958)pi(-) nu(tau) decay is measured to be 7.2 x 10(-6). This last decay proceeds through a second-class current and is expected to be forbidden in the limit of isospin symmetry.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Official Date:	June 2008
Volume:	Vol.77
Number:	No.11
Number of Pages:	9
Page Range:	Article No. 112002
Identification Number:	10.1103/PhysRevD.77.112002
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/29705

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