Measurement of K^-_e3 branching ratio

arxiv(2007)

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摘要
The branching fraction for the decay K^-→π^0 e ν̅ is measured using in-flight decays detected with ISTRA+ setup working at the 25 GeV negative secondary beam of the U-70 PS:Br_K_e3= (5.124 ± 0.009 (stat) ± 0.029(norm) ± 0.030(syst))|V_us|element of the CKM matrix is extracted, using previously measuredf_+(t)form factor:|V_us|=0.227 ±0.002. The results are in agreement with recent measurements by BNL E865, FNAL KTeV, KLOE.
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