First observation of the KS->pi0 gamma gamma decay

NA48 Collaboration

doi:10.1016/j.physletb.2003.10.073

First observation of the KS->pi0 gamma gamma decay

High Energy Physics - Experiment 2012-08-27 v1

Authors: NA48 Collaboration

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

Using the NA48 detector at the CERN SPS, 31 KS->pi0 gamma gamma 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->pi0 gamma gamma) = (4.9 +- 1.6(stat) +- 0.9(syst)) x 10^-8 in agreement with Chiral Perturbation theory predictions.

Keywords

kaon decay K_S → π⁰ γ γ branching ratio NA48 chiral perturbation theory rare decay

Cite

@article{arxiv.hep-ex/0309022,
  title  = {First observation of the KS->pi0 gamma gamma decay},
  author = {NA48 Collaboration},
  journal= {arXiv preprint arXiv:hep-ex/0309022},
  year   = {2012}
}