Experimental search for radiative decays of the pentaquark baryon {Theta}{sup +}(1540)

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778810070094· OSTI ID:21426701

Barmin, V V; Asratyan, A E; Borisov, V S ^[1]; Curceanu, C ^[2]; Davidenko, G V; Guaraldo, C ^[2]; Kubantsev, M A; Larin, I F; Matveev, V A; Shebanov, V A; Shishov, N N; Sokolov, L I; Tumanov, G K; Verebryusov, V S ^[1]

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1. Institute of Theoretical and Experimental Physics (Russian Federation)
2. Laboratori Nazionali di Frascati dell' INFN (Italy)

The data on the reactions K{sup +}Xe {sup {yields}}K{sup 0{gamma}}X and K{sup +}Xe {sup {yields}}K{sup +{gamma}}X, obtained with the bubble chamber DIANA, have been analyzed for possible radiative decays of the {Theta}{sup +}(1540) baryon: {Theta}{sup +} {sup {yields}}K{sup 0}p{gamma} and {Theta}{sup +} {sup {yields}}K{sup +}n{gamma}. No signals have been observed, and we derive the upper limits {Gamma}({Theta}{sup +} {sup {yields}}K{sup 0}p{gamma})/{Gamma}({Theta}{sup +} {sup {yields}}K{sup 0}p) < 0.032 and {Gamma}({Theta}{sup +} {sup {yields}}K{sup +}n{gamma})/{Gamma}({Theta}{sup +} {sup {yields}}K{sup +}n{gamma}) < 0.041 which, using our previous measurement of {Gamma}({Theta}{sup +} {sup {yields}}KN) = 0.39 {+-} 0.10 MeV, translate to {Gamma}({Theta}{sup +} {sup {yields}}K{sup 0}p{gamma}) < 8 keV and {Gamma}({Theta}{sup +} {sup {yields}}K{sup +}n{gamma}) < 11 keV at 90% confidence level. We have also measured the cross sections of K{sup +}-induced reactions involving emission of a neutral pion: {sigma}(K{sup +}n {sup {yields}}K{sup 0}p{pi}{sup 0}) = 68 {+-} 18 {mu}b and {sigma}(K{sup +}N {sup {yields}}K{sup +}N{pi}{sup 0}) = 30 {+-} 8 {mu}b for incident K{sup +} momentum of 640 MeV.

• OSTI ID: 21426701
• Journal Information: Physics of Atomic Nuclei, Vol. 73, Issue 7; Other Information: DOI: 10.1134/S1063778810070094; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7788
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BUBBLE CHAMBERS
CROSS SECTIONS
EMISSION
KAONS PLUS
KEV RANGE
MEV RANGE
PIONS NEUTRAL
RADIATIVE DECAY
BOSONS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GAS TRACK DETECTORS
HADRONS
KAONS
MEASURING INSTRUMENTS
MESONS
PARTICLE DECAY
PIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
STRANGE MESONS
STRANGE PARTICLES