| We study on the rare decay KL → pi 0gammagamma, measure aV, and branching ratio by analysing 96, 97 and 99 data. The measurements were taken by KTeV at Fermi National Accelerator Laboratory. After all cuts, we have 1982 KL → pi0gammagamma candidate. The background level is estimated as 30%. KL → pi 0gammagamma branching ratio is measured as 1.29+/-0.03stat +/-0.04sys x10-6 By using D'Ambrosio's theory to fit aV, aV=--0.31+/-0.05 stat+/-0.07sys . |
