Measurements of the branching fraction and decay distributions for K{sub L}{yields}{pi}{sup {+-}}{mu}{sup {+-}}{nu}{gamma} and K{sub L}{yields}{pi}{sup {+-}}e{sup {+-}}{nu}{gamma}

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.012001· OSTI ID:20705685

Alexopoulos, T; Erwin, A R ^[1]; Andre, T; Blucher, E; Glazov, A; Graham, J; Kessler, R; Monnier, E; Prasad, V; Solomey, N; Wah, Y W; Winstein, B; Winston, R; Worcester, E T ^[2]; Arenton, M; Cox, B; Golossanov, A; Jejer, V; Ledovskoy, A; Nelson, K S ^[3]

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1. University of Wisconsin, Madison, Wisconsin 53706 (United States)
2. Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
3. The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901 (United States); and others

We present measurements of R{sub Kl3{gamma}}{identical_to}{gamma}(K{sub L}{yields}{pi}{sup {+-}}l{sup {+-}}{nu}{gamma};E{sub {gamma}}*>10 MeV)/{gamma}(K{sub L}{yields}{pi}{sup {+-}}l{sup {+-}}{nu}), where l={mu} or e, and E{sub {gamma}}* is the photon energy in the kaon rest frame. These measurements are based on K{sub L} decays collected in 1997 by the KTeV (E832) experiment at Fermilab. With samples of 1385 K{sub L}{yields}{pi}{sup {+-}}{mu}{sup {+-}}{nu}{gamma} and 14221 K{sub L}{yields}{pi}{sup {+-}}e{sup {+-}}{nu}{gamma} candidates, we find R{sub K{mu}}{sub 3{gamma}}=(0.530{+-}0.019)% and R{sub Ke3{gamma}}=(4.942{+-}0.062)%. We also examine distributions of photon energy and lepton-photon angle.

• OSTI ID: 20705685
• Journal Information: Physical Review. D, Particles Fields, Vol. 71, Issue 1; Other Information: DOI: 10.1103/PhysRevD.71.012001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DISTRIBUTION
ELECTRONS
FERMILAB
KAONS NEUTRAL LONG-LIVED
LEPTONIC DECAY
MEV RANGE
MUONS
NEUTRINOS
PARTICLE PRODUCTION
PHOTONS