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

Journal Article · Sun Jan 15 04:00:00 EST 2006 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778806010042· OSTI ID:21076144

Uvarov, V A; Akimenko, S A ^[1]; Bolotov, V N ^[2]; Britvich, G I; Datsko, K V ^[1]; Duk, V A ^[2]; Filin, A P; Inyakin, A V; Khmelnikov, V A; Konstantinov, A S; Konstantinov, V F; Korolkov, I Ya ^[1]; Laptev, S V ^[2]; Leontiev, V M; Novikov, V P; Obraztsov, V F; Polyakov, V A ^[1]; Polyarush, A Yu ^[2]; Romanovsky, V I; Ronjin, V M ^[1]

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1. Institute for High Energy Physics (Russian Federation)
2. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)

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.

• OSTI ID: 21076144
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 1 Vol. 69; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
FORECASTING
GAMMA RADIATION
GEV RANGE 10-100
KAONS MINUS
KINETIC ENERGY
MEV RANGE 10-100
PARTICLE DECAY
PHOTON EMISSION
PIONS MINUS
PIONS NEUTRAL
SECONDARY BEAMS
STANDARDS