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Predicting the τ strange branching ratios and implications for V us

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Abstract

Hadronic τ decays provide several ways to extract the Cabbibo-Kobashi-Maskawa (CKM) matrix element V us . The most precise determination involves using inclusive τ decays and requires as input the total branching ratio into strange final states. Recent results from B-factories have led to a discrepancy of about 3.4σ from the value of V us implied by CKM unitarity and direct determination from Kaon semi-leptonic modes. In this paper we predict the three leading strange τ branching ratios, using dispersive parameterizations of the hadronic form factors and taking as experimental input the measured Kaon decay rates and the τ → Kπν τ decay spectrum. We then use our results to reevaluate V us , for which we find |V us | = 0.2207 ± 0.0027, in better agreement with CKM unitarity.

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Authors and Affiliations

  1. INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044, Frascati, Italy

    Mario Antonelli

  2. Theoretical Division, Los Alamos National Laboratory, MS B283, Los Alamos, NM, 87545, U.S.A.

    Vincenzo Cirigliano & Emilie Passemar

  3. INFN Sezione di Pisa, Scuola Normale Superiore di Pisa, I-56127, Pisa, Italy

    Alberto Lusiani

Authors
  1. Mario Antonelli
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  2. Vincenzo Cirigliano
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  3. Alberto Lusiani
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  4. Emilie Passemar
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Correspondence to Emilie Passemar.

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Antonelli, M., Cirigliano, V., Lusiani, A. et al. Predicting the τ strange branching ratios and implications for V us . J. High Energ. Phys. 2013, 70 (2013). https://doi.org/10.1007/JHEP10(2013)070

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  • DOI: https://doi.org/10.1007/JHEP10(2013)070

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