Experimental study of direct photon emission in K/it{sup -} {sup {yields}} {pi}{sup -}{pi}{sup 0}{gamma} decay using ISTRA+ detector

The branching ratio in the charged-pion-kinetic-energy region of 55 to 90 MeV for the direct photon emission in the K{sup -} {sup {yields}} {pi}{sup -}{pi}{sup 0}{gamma} decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25-GeV/c negative secondary beam of...

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Published inPhysics of atomic nuclei Vol. 69; no. 1
Main Authors Uvarov, V. A., Akimenko, S. A., Bolotov, V. N., Britvich, G. I., Datsko, K. V., Duk, V. A., Filin, A. P., Inyakin, A. V., Khmelnikov, V. A., Konstantinov, A. S., Konstantinov, V. F., Korolkov, I. Ya, Laptev, S. V., Leontiev, V. M., Novikov, V. P., Obraztsov, V. F., Polyakov, V. A., Polyarush, A. Yu, Romanovsky, V. I., Ronjin, V. M.
Format Journal Article
LanguageEnglish
Published United States 15.01.2006
Subjects
BRANCHING RATIO
FORECASTING
GAMMA RADIATION
GEV RANGE 10-100
KAONS MINUS
KINETIC ENERGY
MEV RANGE 10-100
PARTICLE DECAY
PHOTON EMISSION
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS MINUS
PIONS NEUTRAL
SECONDARY BEAMS
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Summary:The branching ratio in the charged-pion-kinetic-energy region of 55 to 90 MeV for the direct photon emission in the K{sup -} {sup {yields}} {pi}{sup -}{pi}{sup 0}{gamma} decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25-GeV/c negative secondary beam of the U-70 PS. The value Br(DE)=[0.37{+-}0.39(stat.){+-}0.10(syst.)]x10{sup -5} obtained from the analysis of 930 completely reconstructed events is consistent with the average value of two stopped-kaon experiments, but it differs by 2.5 standard deviations from the average value of three in-flight-kaon experiments. The result is also compared with recent theoretical predictions.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778806010042