2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/181817The experimental results published by KTeV and the preliminary results from NA48 concerning the slope of the Kpi scalar form factor suggest a significant discrepancy with the prediction of the Callan-Treiman low energy theorem once interpreted within the Standard Model. In this talk, we will show how this discrepancy could be explained as a first evidence of the direct coupling of right-handed quarks to W as suggested by certain type of effective electroweak theories.4 pages, 2 figures. Talk given at the 7th International Conference on Hyperons, Charm And Beauty Hadrons (BEACH 2006), 2-8 July 2006, Lancaster, UKHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext