Study of the decay $D^0\to {\bar{K}}^0{\pi }^{-}{e}^{+}{\nu }_e$

Abstract

We report a study of the decay $D^0\to {\bar{K}}^0{\pi }^{-}{e}^{+}{\nu }_e$ based on a sample of $2.93{\mathrm{fb}}^{-1}$ $e^{+}{e}^{-}$ annihilation data collected at the center-of-mass energy of 3.773~GeV with the BESIII detector at the BEPCII collider. The total branching fraction is determined to be $\mathcal{B}(D^0\to {\bar{K}}^0{\pi }^{-}{e}^{+}{\nu }_e)=(1.434\pm 0.029(stat.)\pm 0.032(syst.))\%$, which is the most precise to date. According to a detailed analysis of the involved dynamics, we find this decay is dominated with the $K^{\ast }(892{)}^{-}$ contribution and present an improved measurement of its branching fraction to be $\mathcal{B}(D^0\to K^{\ast }(892{)}^{-}{e}^{+}{\nu }_e)=(2.033\pm 0.046(stat.)\pm 0.047(syst.))\%$. We further access their hadronic form-factor ratios for the first time as $r_V=V(0)/A_1(0)=1.46\pm 0.07(stat.)\pm 0.02(syst.)$ and $r_2=A_2(0)/A_1(0)=0.67\pm 0.06(stat.)\pm 0.01(syst.)$. In addition, we observe a significant ${\bar{K}}^0{\pi }^{-}$ $S$-wave component accounting for $(5.51\pm 0.97(stat.)\pm 0.62(syst.))\%$ of the total decay rate.

arXiv comment8 pages, 2 figures

References in corpus (15)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Flavor Physics in the Quark Sector
• Leptonic and Semileptonic Decays of Charm and Bottom Hadrons
• Measurement of the absolute branching fraction for ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$
• Study of decay dynamics and $CP$ asymmetry in $D^{+}\to K_L^0{e}^{+}{\nu }_e$ decay
• Analysis of the D+ --> K- pi+ e+ nu_e decay channel
• Absolute Branching Fraction Measurements of Exclusive D^0 Semileptonic Decays
• Study of $D^{+}\to K^{-}{\pi }^{+}{e}^{+}{\nu }_e$
• First Measurement of the Form Factors in the Decays D0 to rho- e+ nu_e and D+ to rho0 e+ nu_e
• Observation of ${\Lambda }_c^{+}\to n{K}_S^0{\pi }^{+}$
• Analysis of D+ to K- pi+ e+ nu_e and D+ to K- pi+ mu+ nu_mu Semileptonic Decays
• Model Independent Measurement of Form Factors in the Decay D^+ --> K^- pi^+ e^+ nu_e
• Analysis of the semileptonic decay $D^0\to {\bar{K}}^0{\pi }^{-}{\mu }^{+}\nu$

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