Study of K-→π0e-ν-bareγ decay with ISTRA+ setup

Results of study of the K-→π0e-ν-barγ decay at the ISTRA+ setup are presented. We observed 4476 events of this decay. The branching ratio is found to be R=(Br(K-→π0e-ν-bareγ))/(Br(K-→π0e-ν-bare)) (1.81±0.03(stat.)±0.07(syst.)) x 10-2 for E*γ > 10 MeV and θ*eγ > 10o. For comparison with the previous experiment the branching ratio with cuts E*γ > 10 MeV, 0.6 < cos θ*eγ < 0.9 is calculated: R (Br(K-→π0e-ν-bareγ))/(Br(K-→π0e-ν-bare)) (0.47±0.02(stat.) ± 0.03(syst.)) x 10-2. For the cuts E*γ > 30 MeV and θ*eγ > 20o, used in most theoretical papers, Br (3.06 ± 0.09(stat.) ± 0.14(syst.)) x 10-4. For the asymmetry we get Aξ = -0.015 ± 0.021. At present it is the best estimate of this asymmetry