${\eta }^{\prime }$ production in B-decays: Standard Model vs. New Physics

Abstract

Standard model factorization can account for the large rate for $B^{\pm }\to {\eta }^{\prime }{K}^{\pm }$. The large rate for $B\to {\eta }^{\prime }{X}_s$ is more problematic and requires a ``cocktail'' solution. Individual contributions from factorization, $b\to {\eta }^{\prime }sg$, and ``intrinsic charm'' fall significantly short of the observed rate. In contrast, the observed ${\eta }^{\prime }$ yields are easily explained in models with $B(b\to sg)\sim 15$. Factorization can account for the entire semi-inclusive ${\eta }^{\prime }$ yield without violating rare decay constraints. Implications for CP violation are discussed.

Comments: 34 pgs, 4 tables, 9 figures