Final Results from the KTeV Experiment on the Decay KL -> pi0 gamma gamma
KTeV Collaboration: E. Abouzaid, M. Arenton, A.R. Barker, L., Bellantoni, E. Blucher, G.J. Bock, E. Cheu, R. Coleman, M.D. Corcoran, B., Cox, A.R. Erwin, C.O. Escobar, A. Glazov, A. Golossanov, R.A. Gomes, P., Gouffon, Y.B. Hsiung, D.A. Jensen, R. Kessler, K. Kotera
TL;DR
This paper presents a precise measurement of the decay rate of KL to pi0 gamma gamma and the vector meson exchange parameter aV, using the full KTeV dataset from 1997-2000, improving upon previous results.
Contribution
It provides the most accurate measurement to date of the branching ratio and aV parameter for KL -> pi0 gamma gamma decay, using the complete KTeV data set.
Findings
Branching ratio B(KL->pi0 gamma gamma) = (1.29 +/- 0.03(stat) +/- 0.05(syst)) x 10^-6
Vector meson exchange parameter aV = -0.31 +/- 0.05(stat) +/- 0.07(syst)
Results supersede earlier measurements with improved precision.
Abstract
We report on a new measurement of the branching ratio B(KL->pi0 gamma gamma)using the KTeV detector. We reconstruct 1982 events with an estimated background of 608, that results in B(KL -> pi0 gamma gamma) = (1.29 +/- 0.03(stat) +/- 0.05(syst)) x 10**-6. We also measure the parameter, aV, which characterizes the strength of vector meson exchange terms in this decay. We find aV = -0.31 +/- 0.05(stat) +/- 0.07(syst). These results utilize the full KTeV data set collected from 1997 to 2000 and supersede earlier KTeV measurements of the branching ratio and aV.
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