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Phys. Rev. D 71, 012001 (2005) [12 pages]

Measurements of the branching fraction and decay distributions for KLπ±μνγ and KLπ±eνγ

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T. Alexopoulos et al. The KTeV Collaboration
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Received 25 October 2004; published 12 January 2005

We present measurements of RK3γΓ(KLπ±νγ;Eγ>10  MeV)/Γ(KLπ±ν), where =μ or e, and Eγ is the photon energy in the kaon rest frame. These measurements are based on KL decays collected in 1997 by the KTeV (E832) experiment at Fermilab. With samples of 1385 KLπ±μνγ and 14221 KLπ±eνγ candidates, we find RKμ3γ=(0.530±0.019)% and RKe3γ=(4.942±0.062)%. We also examine distributions of photon energy and lepton-photon angle.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.012001
DOI:
10.1103/PhysRevD.71.012001
PACS:
13.20.Eb, 14.40.Aq