Search for Tensor Interactions in Kaon Decays at DAPhiNE.pdf

5 9 Search for Tensor Interactions in 9 1 v o Kaon Decays at DAΦNE N 0 1 1 v 7 M. V. Chizhov1 8 2 1 1 5 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 9 Dubna, Russia / h and p - Centre of Space Research and Technologies, Faculty of Physics, University of Sofia, p 2 e 1126 Sofia, Bulgaria h : v i X r a Abstract The semileptonic kaon decays Kl2γ and Kl3 are considered. We use the most general forms of the matrix elements for these decays. Additional terms could arise as a result of new tensor interactions between quarks and leptons. Such terms have been detected in a recent experiments. The high precision experiments at DAΦNE may be ideal to confirm these results. 1E-mail: mih@phys.uni-sofia.bg 2Permanent address 1 Introduction The testing of the Standard Model now reaches its concluding stage. The most precise data are the ones from the LEP experiments with an accuracy ∼ 1%. To describe these data, it is necessary to take into account the electroweak radiative corrections. The data put strict constraints on the new physics i.e. new interactions and new particles. On the other hand the low energy experiments, like particle decays, also can be used as a good test for the V -A interactions. The recent experiments on semileptonic meson decays [1, 2] point to the possible existence of an admixture of tensor interactions [3, 4], whi