Constraints on the form factors forK→πlνand implications for|Vus|

Richard J. Hill
2006 Physical Review D  
Rigorous bounds are established for the expansion coefficients governing the shape of semileptonic K-->pi form factors. The constraints enforced by experimental data from tau-->K pi nu eliminate uncertainties associated with model parameterizations in the determination of |V_us|. The results support the validity of a powerful expansion that can be applied to other semileptonic transitions.
doi:10.1103/physrevd.74.096006 fatcat:glfpys325vbnhoxsgo74bt676i