Study of ${\bar{B}}_s^0\to (D_s^{+},D_s^{\ast +})l^{-}{\bar{\nu }}_l$ decays in the pQCD factorization approach

Abstract

The ${\bar{B}}_s^0\to D_s^{(\ast )+}{l}^{-}{\bar{\nu }}_l$ semileptonic decays were calculated in the framework of the standard model (SM) by employing the perturbative QCD (pQCD) factorization approach. We defined four ratios of the branching ratios of the considered decays $R(D_s^{(\ast )})$ and $R_{D_s}^{l,\tau }$. From the numerical results and phenomenological analysis we found that: (a) The pQCD predictions for the branching ratios $Br({\bar{B}}_s^0\to D_s^{(\ast )+}{l}^{-}{\bar{\nu }}_l)$ generally agree well with the previous theoretical predictions; (b) For the four ratios, the pQCD predictions are $R(D_s)=0.392\pm 0.022$, $R(D_s^{\ast })=0.302\pm 0.011$, $R_{D_s}^l=0.448_{-0.041}^{+0.058}$ and $R_{D_s}^{\tau }=0.582_{-0.045}^{+0.071}$, which show a very good $SU(3{)}_F$ flavor symmetry with the corresponding ratios for $B\to D^{(\ast )}{l}^{-}{\bar{\nu }}_l$ decays; and (c) we strongly suggest the measurements of the new ratios $R(D_s^{(\ast )})$ and $R_{D_s}^{l,\tau }$ in the forthcoming Super-B experiments.

14pages, 4 ps figures

References in corpus (12)

• On the B to D* tau nu Sensitivity to New Physics
• Implications of lepton flavor universality violations in B decays
• The $B(B_s)\to D_{(s)}P$, $D_{(s)}V$, $D_{(s)}^{\ast }P$ and $D_{(s)}^{\ast }V$ decays in the perturbative QCD approach
• $B\to S$ Transition Form Factors in the PQCD approach
• Weak decays of $B_s$ mesons to $D_s$ mesons in the relativistic quark model
• $B_s\to D_s(3040)$ form factors and $B_s$ decays into $D_s(3040)$
• Exclusive $B_s$ decays to the charmed mesons $D_s^{+}(1968,2317)$ in the standard model
• Study on $B_s\to D_{sJ}(2317,2460)l\bar{\nu }$ Semileptonic Decays in the CQM Model
• QCD Sum Rules Study of the Semileptonic $B_s(B^{\pm })(B^0)\to D_s[1968](D^0)(D^{\pm })l\nu$ Decays
• Semileptonic $B_q\to D_q^{\ast }l\nu$ $(q=s,d,u)$ Decays in QCD Sum Rules
• B decay anomalies in an effective theory
• Exclusive weak B decays involving $\tau$ lepton in the relativistic quark model

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