MEASUREMENT OF THE K+-]E+PI-0-UPSILON-GAMMA-DECAY PROBABILITY

VV BARMIN,VG BARYLOV,GV DAVIDENKO,VS DEMIDOV,AG DOLGOLENKO,NK ZOMBKOVSKAYA,AG MESHKOVSKII,GS MIROSIDI,AN NIKITENKO,TA CHISTYAKOVA,VA SHEBANOV,NN SHISHOV

SOVIET JOURNAL OF NUCLEAR PHYSICS-USSR（1991）

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摘要

In photographs of a 180-liter xenon bubble chamber, 88 events of K+ --> e+ pi-0-nu-gamma decay have been observed. The probability of internal bremsstrahlung has been measured: GAMMA (K+ --> e+ pi-0-nu-gamma, IB, E-gamma > 10 MeV, cos theta-e-gamma < 0.98)/GAMMA (K+ --> all) = (7.3 +/- 1.2) x 10(-4). An upper limit has been obtained for the total probability of structure-dependent and interference emission of photons at the 90% confidence level: GAMMA (K+ --> e+ pi-0-nu-gamma,SD + INT)/GAMMA (K+ --> all) < 9.5 x 10(-5).

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