Constraining the eta'-g*-g form factor and implication for B meson decaying to eta'-strange X meson

Using the ϒ → η′ + X data measured by CLEO, we obtain constraints on the η′- g*-g form factor. Our results indicate that only a rapidly falling form factor, consistent with perturbative QCD, is not ruled out. Consequently, within the Standard Model, the b → s(g* → gη′ ) mode should only contribute O(10−5 ) to the B → η′ X_s branching ratio for p_{η ′} > 2.0 GeV. Other contributions to B → η ′X_s are summarized. Our constraint implies that a theoretical explanation for the large rate observed for ( B → η′X_s) (p_η′ > 2.0 GeV) is still lacking within the Standard Model, suggesting that the intervention of New Physics may be required.