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Reviews of topical problems


Flavor changing neutral currents and rare decays of K-mesons


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.

Fulltext pdf (1.3 MB)
Fulltext is also available at DOI: 10.1070/PU2003v046n10ABEH001331
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/
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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