Hadronic mass spectrum analysis of D + → K − π + µ + ν decay and measurement
نویسندگان
چکیده
We present a Kπ mass spectrum analysis of the four-body semileptonic charm decay D+ → K−π+μ+ν in the range of 0.65 GeV/c2 < mKπ < 1.5 GeV/c 2. We observe a non-resonant contribution of 5.30 ± 0.74 − 0.96% with respect to the total D+ → K−π+μ+ν decay. For the K∗(892)0 resonance, we obtain a mass of 895.41 ± 0.32 − 0.43 MeV/c 2, a width of 47.79 ± 0.86 − 1.06 MeV/c 2, and a BlattWeisskopf damping factor parameter of 3.96 ± 0.54 − 0.90 GeV −1. 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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