The form factors of the decay K+ → π+e+νe (Ke3) have been determined from the comparison of the experimental and Monte Carlo Dalitz distributions containing about 105 Ke3 events. The following values of the parameters were obtained: λ+ = 0.0278 ± 0.0017 (stat.) ± 0.0015 (syst.), |fS/f+(0)| = 0.0040 ± 0.0160 (stat.) ± 0.0067 (syst.), and |fT/f+(0)| = 0.019 ± 0.080 (stat.), ± 0.038 (syst.). Both scalar fS and tensor fT form factors are consistent with the Standard Model predictions of zero values.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics