Study of decay with ISTRA+ setup

Results of study of the K- -> pi(0)e(-)(v) over bar gamma decay at the ISTRA+ setup are presented. We observed 4476 events of this decay. The branching ratio is found to be R = Br(K- -> pi(0)e(-)(v) over bar (e)gamma)/Br(K- -> pi(0)e(-)(v) over bar (e)) = (1.81 +/- 0.03(stat.) +/- 0.07(syst.)) x 10(-2) for E-gamma* > 10 MeV, 0.6 < cos theta(e gamma)* < 0.9 is calculated: R = Br(K- -> pi(0)e(-)(v) over bar (e)gamma)/Br(K- -> pi(0)e(-)(v) over bar (e)) = (0.47 +/- 0.02(stat.) +/- 0.03 (syst.)) x 10(-2). For the cuts E-gamma* > 30 MeV and theta(e gamma)* > 20 degrees, used in most theoretical papers, Br = (3.06 +/- 0.09(stat.) +/- 0.14(syst.)) x 10(-4). For the asymmetry we get A(xi) = -0.015 +/- 0.021. At present it is the best estimate of this asymmetry.