Measurement of the form factors of charged kaon semileptonic decays

Abstract

A measurement of the form factors of charged kaon semileptonic decays is presented, based on $4.4\times 10^6$ $K^{\pm }\to \ddot{I}{€}^0{e}^{\pm }\hat{I}{½}_e$ ($K_{e3}^{\pm }$) and $2.3\times 10^6$ $K^{\pm }\to \ddot{I}{€}^0\hat{I}{¼}^{\pm }\hat{I}{½}_{\hat{I}}¼$ ($K_{\mu 3}^{\pm }$) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. The combination of measurements in the $K_{e3}^{\pm }$ and $K_{\mu 3}^{\pm }$ modes is also presented.

20 pages , 9 figures, 5 tables