Study of dynamics ofD0→K−e+νeandD0→π−e+νedecays

Citations Over TimeTop 10% of 2015 papers

Abstract

In an analysis of a $2.92\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample taken at 3.773 GeV with the BESIII detector operated at the BEPCII collider, we measure the absolute decay branching fractions $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{e}^{+}{\ensuremath{\nu}}_{e})=(3.505\ifmmode\pm\else\textpm\fi{}0.014\ifmmode\pm\else\textpm\fi{}0.033)%$ and $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}{\ensuremath{\nu}}_{e})=(0.295\ifmmode\pm\else\textpm\fi{}0.004\ifmmode\pm\else\textpm\fi{}0.003)%$. From a study of the differential decay rates we obtain the products of hadronic form factor and the magnitude of the Cabibbo-Kobayashi- Maskawa (CKM) matrix element ${f}_{+}^{K}(0)|{V}_{cs}|=0.7172\ifmmode\pm\else\textpm\fi{}0.0025\ifmmode\pm\else\textpm\fi{}0.0035$ and ${f}_{+}^{\ensuremath{\pi}}(0)|{V}_{cd}|=0.1435\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0ex}{0ex}}0.0018\ifmmode\pm\else\textpm\fi{}0.0009$. Combining these products with the values of $|{V}_{cs(d)}|$ from the SM constraint fit, we extract the hadronic form factors ${f}_{+}^{K}(0)=0.7368\ifmmode\pm\else\textpm\fi{}0.0026\ifmmode\pm\else\textpm\fi{}0.0036$ and ${f}_{+}^{\ensuremath{\pi}}(0)=0.6372\ifmmode\pm\else\textpm\fi{}0.0080\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0ex}{0ex}}0.0044$, and their ratio ${f}_{+}^{\ensuremath{\pi}}(0)/{f}_{+}^{K}(0)=0.8649\ifmmode\pm\else\textpm\fi{}0.0112\ifmmode\pm\else\textpm\fi{}0.0073$. These form factors and their ratio are used to test unquenched lattice QCD calculations of the form factors and a light cone sum rule (LCSR) calculation of their ratio. The measured value of ${f}_{+}^{K(\ensuremath{\pi})}(0)|{V}_{cs(d)}|$ and the lattice QCD value for ${f}_{+}^{K(\ensuremath{\pi})}(0)$ are used to extract values of the CKM matrix elements of $|{V}_{cs}|=0.9601\ifmmode\pm\else\textpm\fi{}0.0033\ifmmode\pm\else\textpm\fi{}0.0047\ifmmode\pm\else\textpm\fi{}0.0239$ and $|{V}_{cd}|=0.2155\ifmmode\pm\else\textpm\fi{}0.0027\ifmmode\pm\else\textpm\fi{}0.0014\ifmmode\pm\else\textpm\fi{}0.0094$, where the third errors are due to the uncertainties in lattice QCD calculations of the form factors. Using the LCSR value for ${f}_{+}^{\ensuremath{\pi}}(0)/{f}_{+}^{K}(0)$, we determine the ratio $|{V}_{cd}|/|{V}_{cs}|=0.238\ifmmode\pm\else\textpm\fi{}0.004\ifmmode\pm\else\textpm\fi{}0.002\ifmmode\pm\else\textpm\fi{}0.011$, where the third error is from the uncertainty in the LCSR normalization. In addition, we measure form factor parameters for three different theoretical models that describe the weak hadronic charged currents for these two semileptonic decays. All of these measurements are the most precise to date.

Related Papers

• Susquehanna Chorale Spring Concert "Roots and Wings"(2017)
• IDENTIFIKASI MODE RUSAK JAMAK (MULTI-FAULTS) BANTALAN MENGGUNAKAN ANALISIS ENVELOPE PADA TURBIN ANGIN Horizontal Axis(2018)
• EVALUASI PERLAKUAN AKUNTANSI HARGA POKOK PRODUK RUSAK PADA PT. MULIAPRIMA REPLICATAMA SEMARANG(2000)
• ANALISIS PERLAKUAN AKUNTANSI PRODUK RUSAK PADA PT. AJINOMOTO INDONESIA MOJOKERTO FACTORY(2017)
• Perbedaan Kinerja Karyawan Sebelum dan Sesudah Penerapan Uraian Pekerjaan(2001)