Measurement of the branching fractions of the decays ${\tau }^{-}\to K^{-}n{\pi }^0{\nu }_{\tau }$ ($n=0,1,2,3$) and ${\tau }^{-}\to {\pi }^{-}n{\pi }^0{\nu }_{\tau }$ ($n=3,4$) by BaBar

Abstract

We report preliminary measurements of the branching fractions of the decays $\tau \to Kn{\pi }^0\nu$ ($n=0,1,2,3$) and $\tau \to \pi n{\pi }^0\nu$ ($n=3,4$), excluding the contributions that proceed through the decay of intermediate $K^0$ and $\eta$ mesons. The measurements are based on a data sample of 435 million $\tau$ pairs produced in $e^{+}{e}^{-}$ collisions at and near the ${\rm Y}(4S)$ peak and collected with the BaBar detector in 1999-2008. The measured branching fractions are $B({\tau }^{-}\to K^{-}{\nu }_{\tau })=(7.174\pm 0.033\pm 0.213)\times 10^{-3}$, $B({\tau }^{-}\to K^{-}{\pi }^0{\nu }_{\tau })=(5.054\pm 0.021\pm 0.148)\times 10^{-3}$, $B({\tau }^{-}\to K^{-}2{\pi }^0{\nu }_{\tau })=(6.151\pm 0.117\pm 0.338)\times 10^{-4}$, $B({\tau }^{-}\to K^{-}3{\pi }^0{\nu }_{\tau })=(1.246\pm 0.164\pm 0.238)\times 10^{-4}$, $B({\tau }^{-}\to {\pi }^{-}3{\pi }^0{\nu }_{\tau })=(1.168\pm 0.006\pm 0.038)\times 10^{-2}$, $B({\tau }^{-}\to {\pi }^{-}4{\pi }^0{\nu }_{\tau })=(9.020\pm 0.400\pm 0.652)\times 10^{-4}$, where the first uncertainty is statistical and the second one systematic.

10 pages, 2 figures, submitted contribution to the proceedings of the International Workshop on e^+e^- collisions from Phi to Psi, 25 February - 1 March 2019, BINP, Novosibirsk, Russia

References in corpus (2)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Track Finding Efficiency in BaBar

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