Chiral Dynamics and S-wave contributions in Semileptonic $D_s/B_s$ decays into $��^+��^-$
| Autor: | Shi, Yu-Ji, Wang, Wei |
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| Rok vydání: | 2015 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1507.07692 |
| Popis: | In this work, we study the semileptonic decay modes $B_s^0\to ��^+��^-\ell^+\ell^-$ and $D_s^+\to ��^+��^-\ell^+ ��$ in the kinematics region where the $��^+��^-$ system has a invariant mass in the range $0.5$-$1.3$ GeV. These processes are valuable towards the determination of S-wave $��^+��^-$ light-cone distribution amplitudes whose normalizations are scalar form factors. We compare the results for scalar form factors predicted in unitarized chiral perturbation theory and extracted from the data on the $B_s\to J/����^+��^-$. Then the $B_s\to ��^+��^-$ and $D_s\to ��^+��^-$ form factors are calculated in light-cone sum rules, based on which predictions for differential decay widths are made. The results are in good agreement with the experimental data on the $B_s$ and $D_s$ decays into $��^+��^-$. More accurate measurements at BEPC, LHC and KEKB in future will be helpful to examine our formalism and constrain the input parameters more precisely. 15 pages,9 figures |
| Databáze: | OpenAIRE |
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