The decay rate of the neutral K meson KL→e+e−γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL→e+e−γ)/Γ(KL→all) = (1.06±0.02 stat ± 0.02 sys ± 0.04 calc)×10E−5. The parameter describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be =−0.36 ± 0.06 stat ± 0.02 sys.

MEASUREMENT OF THE DECAY RATE AND FORM-FACTOR PARAMETER ALPHA(K*) IN THE DECAY K(L) ---> E+ E- GAMMA

NAPPI, Aniello;ANZIVINO, Giuseppina;
1999

Abstract

The decay rate of the neutral K meson KL→e+e−γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL→e+e−γ)/Γ(KL→all) = (1.06±0.02 stat ± 0.02 sys ± 0.04 calc)×10E−5. The parameter describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be =−0.36 ± 0.06 stat ± 0.02 sys.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11391/16741
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