Analysis of the nonleptonic charmonium modes $B_s^0\to J/\psi f_2^{\prime }(1525)$ and $B_s^0\to J/\psi K^{+}{K}^{-}$

Abstract

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$(B_s^0\to J/\psi f_2^{\prime }(1525))=(1.6{}_{-0.7}^{+0.9})\times 10^{-4}$ 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 $\varphi (1020)$ 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$(B_s^0\to J/\psi K^{+}{K}^{-})=(9.3_{-1.1}^{+1.3})\times 10^{-4}$ is also in satisfactory agreement with the experimental information reported by LHCb and Belle.

19 pages, 2 figures. v3: matches with version (modified and simplified) published in Phys. Rev. D

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