Bs,d → μ+μ- decays in a flavor changing Z' model decays in a flavor changing Z' model

We study the pure leptonic decays Bs,d→μ+μ- in a Flavor Changing Z' Model. Prom the recent measurements of the branching ratios β(Bs,d →μ+μ-).we have derived the bounds on the effective μ-μ-Z' lepton coupling BμμL. We find that, (i) if neglecting the contribution from the right-handed lepton coupling BμμR, we obtain 1.32 < BμμL < 3.32; (ii) if considering the contribution from the right-handed lepton coupling BμμR and setting BμμL = BμμR, we obtain 0.99 < BμμL < 2.19. Our results could be useful for researching Z' effects.