A study of τ decays involving η, and ω mesons

Abstract

The 132 pb^{t - 1} of data collected by ALEPH from 1991 to 1994 have been used to analyze η and ω production in τ decays. The following branching fractions have been measured: $B\left( {{\tau ^ - } \to {\nu _\tau }\omega {h^ - }} \right) = \left( {1.91 \pm 0.07 \pm 0.06} \right) \times {10^{ - 2}},$ $B\left( {{\tau ^ - } \to {\nu _\tau }\omega {h^ - }{\pi ^0}} \right) = \left( {4.3 \pm 0.6 \pm 0.5} \right) \times {10^{ - 3}},$ $B\left( {{\tau ^ - } \to {\nu _\tau }\eta {K^ - }} \right) = \left( {2.9_{ - 1.2}^{ + 1.3} \pm 0.7} \right) \times {10^{ - 4}},$ $B\left( {{\tau ^ - } \to {\nu _\tau }\eta {h^ - }{\pi ^0}} \right) = \left( {1.8 \pm 0.4 \pm 0.2} \right) \times {10^{ - 3}}$ and the 95% C.L. limit B(τ⁻ → ν_τηπ^{t -}) < 6.2 × 10^{t - 4} has been obtained. The ωπ^t- and ηπ^{t -}π⁰ rates and dynamics are found in agreement with the predictions made from e⁺e∼ - annihilation data with the help of isospin invariance (CVC).