A New Measurement of the Radiative Ke3 Branching Ratio and Photon Spectrum
Douglas R. Bergman (for the KTeV Collaboration)
TL;DR
This paper reports a precise new measurement of the branching ratio and photon spectrum in the decay K_L -> pi e nu gamma, confirming that inner bremsstrahlung dominates photon production in this process.
Contribution
It provides the first detailed study of the photon energy spectrum in Ke3g decay and offers an improved measurement of its branching ratio.
Findings
Branching ratio of Ke3g relative to Ke3 is approximately 0.908.
Photon spectrum is consistent with inner bremsstrahlung as the sole photon source.
Measurement uncertainties are well quantified, supporting theoretical models.
Abstract
We present a new measurement of the branching ratio of the decay K_L -> pi e nu gamma (Ke3g) with respect to K_L -> pi e nu (Ke3), and the first study of the photon energy spectrum in this decay. We find BR(Ke3g, E*g>30 MeV, theta*_eg>20 deg)/BR(Ke3) = 0.908 +- 0.008 (stat.) +0.013-0.012 (syst.). Our measurement of the spectrum is consistent with inner bremsstrahlung as the only source of photons in Ke3g.
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