Measurement of the branching ratio of KL→e+e- γγ

A. Alavi-Harati, T. Alexopoulos, M. Arenton, K. Arisaka, S. Averitte, A. R. Barker, L. Bellantoni, A. Bellavance, J. Belz, R. Ben-David, D. R. Bergman, E. Blücher, G. J. Bock, C. Bown, S. Bright, E. Cheu, S. Childress, R. Coleman, M. D. Corcoran, G. CortiB. Cox, M. B. Crisler, A. R. Erwin, R. Ford, P. M. Fordyce, A. Glazov, A. Golossanov, G. Graham, J. Graham, K. Hagan, E. Halkiadakis, K. Hanagaki, S. Hidaka, Y. B. Hsiung, V. Jejer, D. A. Jensen, R. Kassier, H. G E Kobrak, J. Ladue, A. Lath, A. Ledovskoy, P. L. McBride, P. Mikelsons, E. Monnier, T. Nakaya, K. S. Nelson, H. Nguyen, V. O'Dell, M. Pang, R. Pordes, V. Prasad, C. Qiao, B. Quinn, E. J. Ramberg, R. E. Ray, A. Roodman, M. Sadamoto, S. Schnetzer, K. Senyo, P. Shanahan, P. S. Shawhan, W. Slater, N. Solomey, S. V. Somalwar, R. L. Stone, I. Suzuki, E. C. Swallow, S. A. Taegar, R. J. Tesarek, G. B. Thomson, P. A. Toale, A. Tripathi, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, B. Winstein, R. Winston, T. Yamanaka, E. D. Zimmerman

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    We report on a study of the decay KL→e+e- y y carried out as a part of the KTeV/E799 experiment at Fermilab. The 1997 data yielded a sample of 1543 events, including an expected background of 56±8 events. An effective form factor was determined from the observed distribution of the e+e- invariant mass. Using this form factor in the calculation of the detector acceptance, the branching ratio was measured to be B(KL→;E+eTrr,E+>5 MeV) = (5.84±0.15 (slat)±0.32 (syst))× 10-7. ©2001 The American Physical Society.
    Original languageEnglish
    Article number012003
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Issue number1
    Publication statusPublished - 2001


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