Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 715996.0, MPI für Physik / YB 2016
Measurements of Branching Fractions of $\\tau$ Lepton Decays with one or more $K^{0}_{S}$
Authors:
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:89
Start Page:072009
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We report measurements of branching fractions of $\\tau$ lepton decays to final states with a $K^{0}_{S}$ meson using a 669 fb$^{-1}$ data sample accumulated with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The inclusive branching fraction is measured to be $\\mathcal{B}(\\tau^{-} \\to K^{0}_{S}\\ X^{-} \\nu_{\\tau})=(9.15 \\pm 0.01 \\pm 0.15) \\times 10^{-3}$, where $X^{-}$ can be anything; the exclusive branching fractions are $\\mathcal{B}(\\tau^{-} \\to \\pi^{-} K^{0}_{S} \\nu_{\\tau}) = (4.16 \\pm 0.01 \\pm 0.08) \\times 10^{-3}$, $\\mathcal{B}(\\tau^{-} \\to K^{-} K^{0}_{S} \\nu_{\\tau}) = (7.40 \\pm 0.07 \\pm 0.27) \\times 10^{-4}$, $\\mathcal{B}(\\tau^{-} \\to \\pi^{-} K^{0}_{S} \\pi^{0} \\nu_{\\tau}) = (1.93 \\pm 0.02 \\pm 0.07) \\times 10^{-3}$, $\\mathcal{B}(\\tau^{-} \\to K^{-} K^{0}_{S} \\pi^{0} \\nu_{\\tau}) = (7.48 \\pm 0.10 \\pm 0.37)\\times 10^{-4}$, $\\mathcal{B}(\\tau^{-} \\to \\pi^{-} K^{0}_{S} K^{0}_{S} \\nu_{\\tau}) = (2.33 \\pm 0.03 \\pm 0.09) \\times 10^{-4}$, $\\mathcal{B}(\\tau^{-} \\to \\pi^{-} K^{0}_{S} K^{0}_{S} \\pi^{0} \\nu_{\\tau}) = (2.00 \\pm 0.22 \\pm 0.20) \\times 10^{-5}$, where the first uncertainty is statistical and the second is systematic. For each mode, the accuracy is improved over that of pre-$B$-factory measurements by a factor ranging from five to ten. In $\\tau^{-} \\to \\pi^{-} K^0_S K^0_S \\pi^{0} \\nu_{\\tau}$ decays, clear signals for the intermediate states $\\tau^{-} \\to \\pi^- f_{1}(1285)\\nu_{\\tau}$ and $\\tau^{-} \\to K^{*-}K^{0}_{S} \\pi^{0} \\nu_{\\tau}$ are observed.
Classification / Thesaurus:Belle II
Comment of the Author/Creator:17 pages, 18 figures.
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
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