Flavor changing neutral currents and rare decays of K-mesons
L.G. Landsberg
State Research Center ‘Institute of High Energy Physics’, ul. Pobedy 1, Protvino, Moscow Region, 142280, Russian Federation
Processes with K-mesons that are due to weak flavor
changing neutral currents (FCNC) are considered, primarily,
the theoretically clean `golden decays’ K^+ \to \pi^+ \nu \-{\nu} and K_L^0 \to \pi^0 \nu \-{\nu}. Experimental data for these and other processes
violating CP invariance are discussed, and the prospects of
future studies are examined. The results of experiments with
kaons are compared with those obtained for B-mesons (CP-odd
asymmetry in the decays B_d^0(\-{B}_d^0) \to (J/\psi)K_S^0, B_d^0 \rightleftharpoons \-{B}_d^0 mixing). A possible interpretation of the data on the decays K \to \pi \nu \-{\nu}, K_L^0 \to \pi^0 e^+ e^-, and K_L^0 \to \mu^+ \mu^- is discussed within the framework of the Standard Model and of New Physics models.
|