Abstract
The decay rate of KL → π0γγ has been measured with the NA48 detector at the CERN SPS. The branching ratio is determined to be (1.36 ± 0.03(stat) ± 0.03(syst) ± 0.03(norm)) × 10−6 and the vector coupling constant aV = −0.46 ± 0.03(stat) ± 0.03(syst) ± 0.02(theo). Using data collected during a special high intensity run at the end of 1999, the following preliminary branching fractions of the weak radiative decays Ⅺ0: Br(Ⅺ0 → Σ0γ) = (3.7 ± 0.5) × 10−3 and Br(Ⅺ0 → Λγ) = (1.9 ± 0.1 ± 0.2) × 10−3 have been obtained. Future prospects aiming to study rare KS, Ⅺ0 decays and direct CP violation with charged kaon beams are also presented.
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