In this work, we present an analysis of the nonleptonic charmonium modes $B_s^0 \to J / \psi f_2^\prime(1525)$ and $B_s^0 \to J/\psi K^+K^-$. Within the framework of the factorization approach and using the perturbative QCD for the evaluation of the relevant form factors, we find a branching fraction for the two-body channel of BR$(B_s^{ 0} \to J/\psi f_2^{ \prime}(1525)) = (1.6 { }^{ +0.9}_{ -0.7})\times 10^{ -4}$ which is in agreement with the experimental values reported by the LHCb and Belle Collaborations. The associated polarization fractions to this vector-tensor mode are also presented. On the other hand, non-resonant and resonant contributions to the three-body decay $B_s^0 \to J/\psi K^+K^-$ are carefully investigated. The dominant contributions of the resonances $ \phi(1020)$ and $f_2^{ \prime}(1525)$ are properly taken into account. A detailed analysis of the $K^+ K^-$ invariant mass distributions and Dalitz plot are also performed. The overall result BR$(B_s^{ 0} \to J/\psi K^+ K^-) = (9.3^{ +1.3}_{ -1.1})\times 10^{ -4}$ is also in satisfactory agreement with the experimental information reported by LHCb and Belle.
Categories: hep-ph hep-ex