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Final Results from the KTeV Experiment on the Decay KL -> pi0 gamma gamma

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arxiv 0805.0031 v2 pith:H45PQCZ6 submitted 2008-04-30 hep-ex

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
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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 A. Ledovskoy P.L. McBride E. Monnier H. Nguyen R. Niclasen D.G. Phillips II E.J. Ramberg R.E. Ray M. Ronquest E. Santos W. Slater D. Smith N. Solomey E.C. Swallow P.A. Toale R. Tschirhart Y.W. Wah J. Wang H.B. White J. Whitmore M. J. Wilking B. Winstein R. Winston E.T. Worcester T. Yamanaka E. D. Zimmerman R.F. Zukanovich
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keywords gammaktevresultsbranchingdecayratiostatsyst
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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