We present a measurement of the ratio of the decay rates Gamma(K-L -> pi(+)pi(-))/Gamma(K-L -> pi +/- e -/+nu), denoted as Gamma(K2 pi)/Gamma(Ke3). The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K-2 pi and five million K-e3 decays, we find Gamma(K2 pi)/Gamma(Ke3) = (4.835 +/- 0.022stat. +/- 0.016syst.) x 10(-3). From this we derive the branching ratio of the CP violating decay K-L -> pi(+)pi(-) and the CP violation parameter vertical bar eta+-vertical bar. Excluding the CP conserving direct photon emission component K-L -> pi(+)pi(-)gamma, we obtain the results BR(K-L -> pi(+)pi(-)) = (1.941 +/- 0.019) x 10(-3) and vertical bar eta+-vertical bar = (2.223 +/- 0.012) x 10(-3). (c) 2006 Elsevier B.V. All rights reserved.

Measurement of the ratio Gamma(K-L -> pi(+)pi(-))/Gamma(K-L -> pi(+/-)e(-/+)nu) and extraction of the CP violation parameter vertical bar eta(+-)vertical bar / A., L., D., M., A., B., R. S., D., T. J., G., B., H., G. E., K., C., L., D. J., M., E., O., M. A., P., T. O., W., S. A., W., G., B., G., B., A., C., T., C.D., D., C., D'Agostini, G., N., D., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 645:1(2007), pp. 26-35. [10.1016/j.physletb.2006.11.071]

Measurement of the ratio Gamma(K-L -> pi(+)pi(-))/Gamma(K-L -> pi(+/-)e(-/+)nu) and extraction of the CP violation parameter vertical bar eta(+-)vertical bar

D'AGOSTINI, Giulio;
2007

Abstract

We present a measurement of the ratio of the decay rates Gamma(K-L -> pi(+)pi(-))/Gamma(K-L -> pi +/- e -/+nu), denoted as Gamma(K2 pi)/Gamma(Ke3). The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K-2 pi and five million K-e3 decays, we find Gamma(K2 pi)/Gamma(Ke3) = (4.835 +/- 0.022stat. +/- 0.016syst.) x 10(-3). From this we derive the branching ratio of the CP violating decay K-L -> pi(+)pi(-) and the CP violation parameter vertical bar eta+-vertical bar. Excluding the CP conserving direct photon emission component K-L -> pi(+)pi(-)gamma, we obtain the results BR(K-L -> pi(+)pi(-)) = (1.941 +/- 0.019) x 10(-3) and vertical bar eta+-vertical bar = (2.223 +/- 0.012) x 10(-3). (c) 2006 Elsevier B.V. All rights reserved.
2007
cp violation; kaon decays
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the ratio Gamma(K-L -> pi(+)pi(-))/Gamma(K-L -> pi(+/-)e(-/+)nu) and extraction of the CP violation parameter vertical bar eta(+-)vertical bar / A., L., D., M., A., B., R. S., D., T. J., G., B., H., G. E., K., C., L., D. J., M., E., O., M. A., P., T. O., W., S. A., W., G., B., G., B., A., C., T., C.D., D., C., D'Agostini, G., N., D., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 645:1(2007), pp. 26-35. [10.1016/j.physletb.2006.11.071]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/357412
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