Measurements of the absolute branching fractions for D->Kbar pi e+ nu_e, D-> K*bar e+nu_e and determination of Gamma(D+ -> K*0bar e+ nu_e)/Gamma(D+ -> K0bar e+nu_e)

Abstract

Using the data of about 33 pb${}^{-1}$ collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, we have studied the exclusive semileptonic decays $D^{+}\to K^{-}{\pi }^{+}{e}^{+}{\nu }_e$, $D^0\to {\bar{K}}^0{\pi }^{-}{e}^{+}{\nu }_e$, $D^{+}\to {\bar{K}}^{\ast 0}{e}^{+}{\nu }_e$ and $D^0\to K^{\ast -}{e}^{+}{\nu }_e$. The absolute branching fractions for the decays are measured to be $BF(D^{+}\to K^{-}{\pi }^{+}{e}^{+}{\nu }_e)=(3.50\pm 0.75\pm 0.27)$, $BF(D^0\to {\bar{K}}^0{\pi }^{-}{e}^{+}{\nu }_e)=(2.61\pm 1.04\pm 0.28)$, $BF(D^{+}\to {\bar{K}}^{\ast 0}{e}^{+}{\nu }_e)=(5.06\pm 1.21\pm 0.40)$ and $BF(D^0\to K^{\ast -}{e}^{+}{\nu }_e)=(2.87\pm 1.48\pm 0.39)$. The ratio of the vector to pseudoscalar semileptonic decay rates $\Gamma (D^{+}\to {\bar{K}}^{\ast 0}{e}^{+}{\nu }_e)/\Gamma (D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e)$ is determined to be $0.57\pm 0.17\pm 0.02$.

References in corpus (7)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Leptonic and Semileptonic Decays of Charm and Bottom Hadrons
• BESII Detector Simulation
• Direct Measurements of the Branching Fractions for $D^0\to K^{-}{e}^{+}{\nu }_e$ and $D^0\to {\pi }^{-}{e}^{+}{\nu }_e$ and Determinations of the Form Factors $f_{+}^K(0)$ and $f_{+}^{\pi }(0)$
• Absolute Branching Fraction Measurements of Exclusive D^+ Semileptonic Decays
• Direct Measurement of the Branching Fraction for the Decay of $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ and Determination of $\Gamma (D^0\to K^{-}{e}^{+}{\nu }_e)/\Gamma (D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e)$
• Measurement of the Ratio of the Vector to Pseudoscalar Charm Semileptonic Decay Rate Γ(D+ > ANTI-K*0 mu+ nu)/Γ(D+ > ANTI-K0 mu+ nu)

Cited by in corpus (6)

• Weak decays of heavy hadrons into dynamically generated resonances
• Investigating the nature of light scalar mesons with semileptonic decays of D mesons
• Direct Measurements of Absolute Branching Fractions for D0 and D+ Inclusive Semimuonic Decays
• Probing the R-parity violating supersymmetric effects in the exclusive $c\to d/s\ell {\nu }_{\ell }$ decays
• Direct Measurements of the Branching Fractions for Inclusive $K^{\pm }$ and Inclusive Semileptonic Decays of $D^{+}$ and $D^0$ Mesons
• A Review of Charm Semileptonic Decays