What is the CKM element for J psi and phi meson

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The discussion focuses on calculating the CKM (Cabibbo-Kobayashi-Maskawa) matrix elements for B0s decays involving J/psi and phi mesons. The user has successfully determined branching fractions for certain decays using the CKM matrix but is uncertain about the appropriate values to apply for the J/psi meson, which consists of charm and anticharm quarks. Clarification on which CKM matrix elements to use for these specific decays is sought. The conversation highlights the complexities of applying the CKM matrix in different decay scenarios. Understanding the correct CKM values is crucial for accurate branching fraction calculations.
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Homework Statement
Estimate the branching fraction of B0s to J/psi and phi
Relevant Equations
the ckm matrix
I am given the ckm matrix and told that B0s decay to Ds- and pi+ with a branching frcation of 3x10-3. I am then asked to find the branching fraction for other decays. I have done this easily enough for decays like B0s to Ds-K+ by using the ckm matrix elements. However the J/psi meson is a charm anticharm meson. Im just not to sure what value to take from the CKM matrix and would love some help!
 

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