Measurement of the charge asymmetry in the decays KoL → π±e±ν and KoL → π±μ±ν

Autor:	Konrad Kleinknecht, S. Gjesdal, P. Steffen, J. Steinberger, H. D. Wahl, G. Presser, T. Kamae, F. Eisele, H. Filthuth, G. Zech, C. Geweniger, V. Lüth, F. Vannucci
Rok vydání:	1974
Předmět:	Nuclear physics Physics Nuclear and High Energy Physics CPT symmetry media_common.quotation_subject Analytical chemistry CP violation Charge (physics) Asymmetry media_common
Zdroj:	Physics Letters B. 48:483-486
ISSN:	0370-2693
DOI:	10.1016/0370-2693(74)90384-0
Popis:	The charge asymmetry in semi-leptonic K L 0 decays has been measured in a high statistics experiment using multi-wire proportional chambers. The asymmetry δ = ( N + − N − )/( N + + N − ), where N + and N − are the partial decay rates for K L 0 → π − Q + ν and K L 0 → π + Q − , respectively, is found to be δ L e = (3.41 ± 0.18) × 10 −3 for the K e3 mode, and δ L μ = (3.13 ± 0.29) × 10 −3 for the K μ3 mode. Assuming CPT invariance and the absence of Δ S = −Δ Q transitions, these results lead to a value of the real part of the CP -violation parameter ɛ, Re ɛ = (1.67 ± 0.08) × 10 −3 .
Databáze:	OpenAIRE
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