Flavor changing neutral currents and rare decays of K-mesons

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.

PACS: 11.30.Er, 12.10.Dm, 12.60.−i, 13.20.Eb (all)
DOI: 10.1070/PU2003v046n10ABEH001331
URL: https://ufn.ru/en/articles/2003/10/a/
Web of Science

000188974100001
Citation: Landsberg L G "Flavor changing neutral currents and rare decays of K-mesons" Phys. Usp. 46 995–1051 (2003)

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Оригинал: Ландсберг Л Г «Нейтральные токи с изменением кварковых ароматов и редкие распады К-мезонов» УФН 173 1025–1082 (2003); DOI: 10.3367/UFNr.0173.200310a.1025

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