Measurements of the Branching Fractions and Decay Distributions for KL->πμνγand KL->πeνγ

Details Measurements of the Branching Fractions and Decay Distributions for KL->πμνγand KL->πeνγ Measurements of the Branching Fractions and Decay Distributions for KL->πμνγand KL->πeνγ

2004-10-23

arxiv.org/abs/hep-ex/0410070v1

Phys.Rev.D71:012001,2005

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.71.012001

We present measurements of R_Kl3rad = Gamma(KL->\pi\ell\nu\gamma; Egcm > 10 MeV)/Gamma(KL->\pi\ell\nu), where ell = mu or e, and Egcm 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 KL->\pi\mu\nu\gamma and 14221 KL->\pi\e\nu\gamma candidates, we find R_Km3rad = (0.530 +- 0.019)% and R_Ke3rad = (4.942 +- 0.062)%. We also examine distributions of photon energy and lepton-photon angle.

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