Measurement of K0e3 form factors
NA48 collaboration
Abstract
The semileptonic decay of the neutral K meson, KL -> pi e nu (Ke3), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f+(q2)), scalar (fS) and tensor (fT) interactions were measured. The linear slope of the vector form factor lambda+ = 0.0284+-0.0007+-0.0013 and values for the ratios |fS/f+(0)| = 0.015+0.007-0.010+-0.012 and |fT/f+(0)| = 0.05+0.03-0.04+-0.03 were obtained. The values for fS and fT are consistent with zero. Assuming only Vector-Axial vector couplings, lambda+ = 0.0288+-0.0004+-0.0011 and a good fit consistent with pure V-A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M = 859+-18 MeV, consistent with the K*(892) mass.
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