Precise measurements of the KS → γγ and KL → γγ decay rates

Journal article

The KS → γγ decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR(KS → γγ) = (2.78 ± 0.06stat ± 0.04syst) x 10-6, obtained from 7461 ± 172 KS → γγ events, is significantly higher than the O(p4) prediction of chiral perturbation theory. Using a KL beam the ratio Γ(KL → γγ)/Γ(KL → π0π0π0) = (2.81 ± 0.02syst) ×10-3 has been measured. © 2002 Elsevier Science B.V. All rights reserved.

Authors: Lai, A; Marras, D; Batley, JR; Dosanjh, R; Gershon, T

• Journal: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volume: 551
• Issue: 1-2
• Pages: 7-15
• Publication date: 2003-01-02
• DOI: 10.1016/S0370-2693(02)02955-6
• ISSN: 0370-2693
• Language: English