The rate of the decay of the neutral K meson into K_L --> mu mu gamma has been measured with the NA48 detector at the CERN SPS. A total of 59 events has been observed with an estimated background of 14 events. The overall Kaon flux was determined to be 1.2 × 10^9. This observation corresponds to a branching ratio of (3.4 ± 0.6 stat ± 0.4 sys ) × 10^-7. Using this branching ratio the parameter alphaK* describing the relative strength of the two contributing amplitudes to this decay, through intermediate pseudoscalar or vector-like mesons, was measured to be alphaK* = (-0.04 +0.24-0.21).
Measurement of the decay rate and the parameter alpha(K)* of the decay K_L --> mu mu gamma
GIANOLI, Alberto;DALPIAZ, Pietro;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
1997
Abstract
The rate of the decay of the neutral K meson into K_L --> mu mu gamma has been measured with the NA48 detector at the CERN SPS. A total of 59 events has been observed with an estimated background of 14 events. The overall Kaon flux was determined to be 1.2 × 10^9. This observation corresponds to a branching ratio of (3.4 ± 0.6 stat ± 0.4 sys ) × 10^-7. Using this branching ratio the parameter alphaK* describing the relative strength of the two contributing amplitudes to this decay, through intermediate pseudoscalar or vector-like mesons, was measured to be alphaK* = (-0.04 +0.24-0.21).File in questo prodotto:
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