Results from the NA48 experiment on the semileptonic decays of charged kaons.

Mauro Piccini
In the 2003 and 2004 years the NA48/2 experiment collected a large sample of $K^{\pm}$ decays. Using a run with minimal trigger conditions a sample of $2.5 \times 10^6$ $K^{\pm}\rightarrow \pi^0 \mu^{\pm} \nu_{\mu}$ ($K^{\pm}_{\mu 3}$) events and $4.0\times 10^6$ $K^{\pm}\rightarrow \pi^0 e^{\pm} \nu_{e}$ ($K^{\pm}_{e 3}$) were collected. These samples allow a precise measurement of the form factors according to various parameterisations. In this report the event selections and the fitting procedure are described and preliminary...