Analyzing e+e− collision data corresponding to an integrated luminosity of 7.33 fb−1 collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we measure the branching fraction of the semileptonic decay D+s → K0e+νe to be (2.98 0.23stat 0.12syst) × 10−3. Based on fit to the partial decay rates in various q2 intervals, the product value of D+ s → K0 hadronic form factor and Cabibbo-Kobayashi-Maskawa element is measured to be f+K0(0)|Vcd| =0.143 \pm 0.011stat \pm 0.003syst. With |Vcd|= 0.22486 0.00067 as an input, the hadronic form factor is evaluated to be fK0(0)= 0.636 \pm 0.049stat \pm 0.013syst. The branching fraction and form factor measurements are factors of 1.6 and 1.7 more precise than the previous world averages, respectively
Improved measurement of the semileptonic decay Ds+→K0e+νe
Garzia, I.;
2024
Abstract
Analyzing e+e− collision data corresponding to an integrated luminosity of 7.33 fb−1 collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we measure the branching fraction of the semileptonic decay D+s → K0e+νe to be (2.98 0.23stat 0.12syst) × 10−3. Based on fit to the partial decay rates in various q2 intervals, the product value of D+ s → K0 hadronic form factor and Cabibbo-Kobayashi-Maskawa element is measured to be f+K0(0)|Vcd| =0.143 \pm 0.011stat \pm 0.003syst. With |Vcd|= 0.22486 0.00067 as an input, the hadronic form factor is evaluated to be fK0(0)= 0.636 \pm 0.049stat \pm 0.013syst. The branching fraction and form factor measurements are factors of 1.6 and 1.7 more precise than the previous world averages, respectively| File | Dimensione | Formato | |
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PhysRevD.110.052012.pdf
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