Measurement of the inclusive branching fraction $\tau^- \to \nu_\tau \pi^-\pi^0$ neutral meson(s)

Aihara, H.; Alston-Garnjost, M.; Avery, R.E.; Barbaro-Galtieri, A.; Barker, A.R.; Barnes, A.V.; Barnett, B.A.; Bauer, Daniel A.; Bengtsson, H.U.; Bintinger, D.L.

doi:10.1103/PhysRevLett.57.1836

Measurement of the inclusive branching fraction $\tau^- \to \nu_\tau \pi^-\pi^0$ neutral meson(s)

TPC/Two Gamma

Collaboration

Jun, 1986

10 pages

Published in:

Phys.Rev.Lett. 57 (1986) 1836

DOI:

10.1103/PhysRevLett.57.1836

PDG:

{{\mathit \tau}^{-}}

\rightarrow

{{\mathit \eta}}{{\mathit K}^{-}}{{\mathit \nu}_{{{\tau}}}}

Report number:

LBL-21766

Experiments:

SLAC-PEP-004

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Abstract: (APS)

We measure an inclusive branching fraction of (13.9 ± 2.0−2.2+1.9)% for the decay τ−→ντπ−π0+nh0(n>~1), where h0 is a π0 or an η. The data sample, obtained with the time-projection-chamber detector facility at the SLAC e+e− storage ring PEP, corresponds to an integrated luminosity of 72 pb−1 at 29 GeV center-of-mass energy. The measured branching fraction is somewhat greater than the theoretical prediction and, with errors taken into account, could resolve the present difference between the inclusive and the sum of the exclusive τ± branching fractions into one charged prong.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
TAU-: ELECTROPRODUCTION
ELECTROPRODUCTION: TAU-
TAU-: SEMILEPTONIC DECAY
SEMILEPTONIC DECAY: TAU-
DECAY: INCLUSIVE REACTION
INCLUSIVE REACTION: DECAY