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Measurement of the decay $K_{L} \to π^{0} e^{+} e^{-} γ$

E. Abouzaid⁴, M. Arenton¹¹, A. R. Barker^5,*, L. Bellantoni⁷, E. Blucher⁴, G. J. Bock⁷, E. Cheu^1,†, R. Coleman⁷, B. Cox¹¹ et al. (KTeV Collaboration)

B. Cox¹¹, A. R. Erwin¹², C. O. Escobar³, A. Glazov⁴, A. Golossanov¹¹, R. A. Gomes³, P. Gouffon¹⁰, Y. B. Hsiung⁷, D. A. Jensen⁷, R. Kessler⁴, Y. J. Kim¹, K. Kotera⁸, A. Ledovskoy¹¹, P. L. McBride⁷, E. Monnier^4,‡, K. S. Nelson¹¹, H. Nguyen⁷, R. Niclasen⁵, D. G. Phillips, II¹¹, H. Ping¹², E. J. Ramberg⁷, R. E. Ray⁷, M. Ronquest¹¹, E. Santos¹⁰, W. Slater², D. Smith¹¹, N. Solomey⁴, E. C. Swallow^4,6, P. A. Toale⁵, R. Tschirhart⁷, C. Velissaris¹², Y. W. Wah⁴, J. Wang¹, H. B. White⁷, J. Whitmore⁷, M. J. Wilking⁵, R. Winston⁴, E. T. Worcester⁴, M. Worcester⁴, T. Yamanaka⁸, E. D. Zimmerman⁵, and R. F. Zukanovich¹⁰ (KTeV Collaboration)

¹University of Arizona, Tucson, Arizona 85721, USA
²University of California at Los Angeles, Los Angeles, California 90095, USA
³Universidade Estadual de Campinas, Campinas, Brazil 13083-970
⁴The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
⁵University of Colorado, Boulder, Colorado 80309, USA
⁶Elmhurst College, Elmhurst, Illinois 60126, USA
⁷Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
⁸Osaka University, Toyonaka, Osaka 560-0043 Japan
⁹Rice University, Houston, Texas 77005, USA
¹⁰Universidade de São Paulo, São Paulo, Brazil 05315-970
¹¹The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901, USA
¹²University of Wisconsin, Madison, Wisconsin 53706, USA

^*Deceased.
^†To whom correspondence should be addressed. elliott@physics.arizona.edu
^‡Permanent address: C.P.P. Marseille/C.N.R.S., France.

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Phys. Rev. D 76, 052001 – Published 12 September, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.052001

Abstract

We report on a new measurement of the branching ratio $B (K_{L} \to π^{0} e^{+} e^{-} γ)$ using the KTeV detector. This analysis uses the full KTeV data set collected from 1997 to 2000. We reconstruct 139 events over a background of 14, which results in $B (K_{L} \to π^{0} e^{+} e^{-} γ) = (1.62 \pm {0.14}_{stat} \pm {0.09}_{syst}) \times 10^{- 8}$ . This result supersedes the earlier KTeV measurement of this branching ratio.