Constraining Scalar Leptoquarks from the K and B Sectors

Abstract

Upper bounds at the weak scale are obtained for all ${\lambda }_{ij}{\lambda }_{im}$ type product couplings of the scalar leptoquark model which may affect K-K(bar), B_d-B_d(bar), and B_s-B_s(bar)$ mixing, as well as leptonic and semileptonic K and B decays. Constraints are obtained for both real and imaginary parts of the couplings. We also discuss the role of leptoquarks in explaining the anomalously large CP-violating phase in B_s-B_s(bar) mixing.

Comments: 16 pages, 5 figures, more constraints analyzed, added a number of references