A Study of the Radiative KL->pi nu e (g) Decay and Possible Osservation of Direct Photon Emission with the KLOE Detector

2007/07/31 by Kloe Collaboration
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.0707.4634

13 pages + 9 figures Contribute to Leptono Photon 2007

arxiv created 2007/07/31 · arxiv updated 2012/08/27

Abstract

We present the measurement of the ratio R = (Γ(\keg;\Estar>30\mev,\qstar>20^∘))/(Γ(\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 ± 23_stat ± 16_syst)10^-5 for the branching ratio and X =-2.3± 1.3_stat± 1.4_syst for the parameter describing direct emission.

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