First observation of the KS→ π0γγ decay
Abstract
Using the NA48 detector at the CERN SPS, 31 KS→π0γγ 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±0.9syst)×10-8 in agreement with Chiral Perturbation Theory predictions.
- Publication:
-
Physics Letters B
- Pub Date:
- January 2004
- DOI:
- 10.1016/j.physletb.2003.10.073
- arXiv:
- arXiv:hep-ex/0309022
- Bibcode:
- 2004PhLB..578..276L
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- 10 pages, 4 figures submitted to Phys. Lett. B