First measurement of the rate K0L → πμνγ
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 418:3-4 (1998) 411-418
Abstract:
In a preliminary version of the NA48 experiment at the CERN SPS, in which an iron-scintillator sandwich calorimeter was used as a photon detector, the ratio of KL → πμνγ and KL → πμν decays was measured. The branching ratio BR(KL → πμνγ,E*γ ≥30 MeV)/(KL → πμν) is found to be (2.08 ± 0.17+0.16-0.21) × 10-3, where the first error is statistical and the second systematic. The result is in agreement with theoretical predictions. © 1998 Elsevier Science B.V.First measurement of the rate K-L(0)->pi mu nu gamma
418 (1998) 411-418
Measurement of the decay K-L -> e(+)e(-)gamma gamma
420 (1998) 205-210
Measurement of the decay rate and the parameter αK* of the decay KL → μμγ
Zeitschrift fur Physik C-Particles and Fields 76:4 (1997) 653-657
Abstract:
The rate of the decay of the neutral K meson into KL0 → μμγ 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 × 109. This observation corresponds to a branching ratio of (3.4 ± 0.6stat ± 0.4sys) × 10-7. Using this branching ratio the parameter αK* describing the relative strength of the two contributing amplitudes to this decay, through intermediate pseudoscalar or vector-like mesons, was measured to be αK*= -0.04-0.21+0.24. © Springer-Verlag 1997.Measurement of the K-S mean lifetime from pi(+)pi(-) and pi(0)pi(0) decays using K-L decays to determine the acceptance
73 (1997) 629-632