High Energy Physics Seminars

The decay K_L-> 2π ⁰_γ is interesting as a probe of the sixth order of chiral perturbation theory. I am currently searching for this decay using data collected by the KTeV experiment in 1997. The decay is swamped by 3π⁰background events with one missing photon. Using Monte Carlo simulations of the two modes, I have designed cuts to eliminate this background while retaining signal events. The current upper limit on the decay is 5.6*10-⁶; my current single event sensitivity is 2.19*10^-7 with only one background event remaining for one flux of data. I hope to extend this work to the 1999 data while retaining this low SES and background level.