Analysis of the Kπ hadronic state interaction using D→Kπμν semileptonic decays from the FOCUS experiment
نویسنده
چکیده
We present a four-body semileptonic charm decay D → Kπμν analysis in the range of 0.65 GeV/c < mKπ < 1.5 GeV/c . We observe a low mass scalar contribution of 5.30 ± 0.74 0.99 − 0.96% with respect to the total D →Kπμν decay, compatible with the phase shift found by the LASS elastic scattering experiment. For the K(892) resonance, we obtain a mass of 895.41 ± 0.32 − 0.43 MeV/c , a width of 47.79 ± 0.86 − 1.06 MeV/c , and a Blatt-Weisskopf damping factor parameter of 3.96±0.54 1.31 − 0.90 GeV . We also report 90% CL upper limits of 4% and 0.64% for the branching ratios Γ(D + →K(1680)μν) Γ(D+→K−π+μ+ν) and Γ(D+→K∗0(1430) μν) Γ(D+→K−π+μ+ν) , respectively.
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