We report the results of a search for the decay KL000 conducted by the E799 Collaboration at Fermilab. The amplitude for this process vanishes to O(p4) in chiral perturbation theory, so a measurement of the decay would directly probe O(p6) effects. This is the first published search for this decay mode and we set a 90% confidence level upper limit on the branching ratio of B(KL000)<2.3×10-4.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)