Reviews of topical problems

Flavor changing neutral currents and rare decays of K-mesons

State Research Center Institute ofHigh 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.

Fulltext is available at IOP
PACS: 11.30.Er, 12.10.Dm, 12.60.−i, 13.20.Eb (all)
DOI: 10.1070/PU2003v046n10ABEH001331
Citation: Landsberg L G "Flavor changing neutral currents and rare decays of K-mesons" Phys. Usp. 46 995–1051 (2003)
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:    «     -» 173 1025–1082 (2003); DOI: 10.3367/UFNr.0173.200310a.1025

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