Search for CP violation in K0 → 3π0 decays
Abstract
Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay KS → 3π0 has been performed. From a fit to the lifetime distribution of about 4.9 million reconstructed K0 /Kbar0 → 3π0 decays, the CP violating amplitude η000 = A (KS → 3π0) / A (KL → 3π0) has been found to be Re (η000) = - 0.002 ± 0.011 ± 0.015 and Im (η000) = - 0.003 ± 0.013 ± 0.017. This corresponds to an upper limit on the branching fraction of Br (KS → 3π0) < 7.4 ×10-7 at 90% confidence level. The result is used to improve knowledge of Re (ɛ) and the CPT violating quantity Im (δ) via the Bell-Steinberger relation.
- Publication:
-
Physics Letters B
- Pub Date:
- March 2005
- DOI:
- 10.1016/j.physletb.2005.01.065
- arXiv:
- arXiv:hep-ex/0408053
- Bibcode:
- 2005PhLB..610..165L
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- 18 pages, 7 figures, submitted to Phys. Lett. B