Final results from the KTeV experiment on the decay K{sub L}{yields}{pi}{sup 0}{gamma}{gamma}

Journal Article · Sun Jun 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.112004· OSTI ID:21205044

Abouzaid, E; Blucher, E; Glazov, A; Kessler, R; Monnier, E; Solomey, N; Wah, Y W; Winstein, B; Winston, R; Worcester, E T ^[1]; Arenton, M; Cox, B; Golossanov, A; Ledovskoy, A; II, D G. Phillips; Ronquest, M; Smith, D ^[2]; Barker, A R; Niclasen, R; Toale, P A ^[3]

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1. Enrico Fermi Institute, University of Chicago, Chicago, IL 60637 (United States)
2. Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, VA 22901 (United States)
3. University of Colorado, Boulder, CO 80309 (United States)

We report on a new measurement of the branching ratio B(K{sub L}{yields}{pi}{sup 0}{gamma}{gamma}) using the KTeV detector. We reconstruct 1982 events with an estimated background of 608, that results in B(K{sub L}{yields}{pi}{sup 0}{gamma}{gamma})=(1.29{+-}0.03{sub stat}{+-}0.05{sub syst})x10{sup -6}. We also measure the parameter, a{sub V}, which characterizes the strength of vector meson exchange terms in this decay. We find a{sub V}=-0.31{+-}0.05{sub stat}{+-}0.07{sub syst}. These results utilize the full KTeV data set collected from 1997 to 2000 and supersede earlier KTeV measurements of the branching ratio and a{sub V}.

• OSTI ID: 21205044
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DECAY
GAMMA RADIATION
PARTICLE DECAY
PIONS NEUTRAL
VECTOR MESONS