First observation of the KS → π0γ γ decay

Journal article

Using the NA48 detector at the CERN SPS, 31 KS → π 0γγ candidates with an estimated background of 13.7 ± 3.2 events have been observed. This first observation leads to a branching ratio of BR(KS → π0γγ) z>0.2 = (4.9 ± 1.6stat ± 0.9 syst) × 10-8 in agreement with Chiral Perturbation Theory predictions. © 2003 Elsevier 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: 578
• Issue: 3-4
• Pages: 276-284
• Publication date: 2004-01-08
• DOI: 10.1016/j.physletb.2003.10.073
• ISSN: 0370-2693
• Language: English