Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-07-31
Physics
High Energy Physics
High Energy Physics - Experiment
13 pages + 9 figures Contribute to Leptono Photon 2007
Scientific paper
We present the measurement of the ratio R = \frac{\Gamma(\keg;\Estar>30\mev,\qstar>20^\circ)}{\Gamma(\kegf)} and a first measurement of the direct emission contribution for the same process. We use 328 pb^{-1} of data collected at \kloe in 2001 and 2002, corresponding to about 3 million of \kegf events and about 9 thousand \keg radiative events. Our result is R= (924 \pm 23_{stat} \pm 16_{syst})10^{-5} for the branching ratio and X =-2.3\pm 1.3_{stat}\pm 1.4_{syst} for the parameter describing direct emission.
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