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- W2316101771 abstract "We perform a combined analysis of $tauto Kpi nu_tau$ decay and $pi K$ scattering with constraints from $K_{ell3}$ data using a $N/D$ approach that fulfills requirements from unitarity and analyticity. We obtain a good fit of the $I=1/2$ $pi K$ amplitude in the $P$ wave using the LASS data above the elastic region while in this region data are generated via Monte Carlo using the FOCUS results based on $D_{ell 4}$ decay. The spectrum and branching ratio of $tauto Kpi nu_tau$ constrained by $K_{ell3}$ decays are also well reproduced leading to $f_+(0) |V_{us}|= 0.2163 pm 0.0014 $. Furthermore, we obtain the slope of the vector form factor $lambda_+=(25.56 pm 0.40) times 10^{-3} $ while the value of the scalar form factor at the Callan-Treiman point is $ln C=0.2062 pm 0.0089$. Given the experimental precision our results are compatible with the Standard model." @default.
- W2316101771 created "2016-06-24" @default.
- W2316101771 creator A5015484141 @default.
- W2316101771 date "2014-06-01" @default.
- W2316101771 modified "2023-10-14" @default.
- W2316101771 title "First determination of f +(0)|V us | from a combined analysis of τ → Kπν τ decay and πK scattering with constraints from K ℓ3 decays" @default.
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- W2316101771 doi "https://doi.org/10.1007/jhep06(2014)082" @default.
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