Energy dependence of the pp->K{sup +}nSIGMA{sup +} reaction close to threshold

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.045208· OSTI ID:21388973

Valdau, Yu; Mikirtychiants, S ^[1]; Barsov, S; Dzyuba, A; Koptev, V ^[1]; Buescher, M; Hartmann, M; Kacharava, A; Nekipelov, M; Ohm, H; Rathmann, F; Stroeher, H ^[2]; Chiladze, D ^[2]; Dymov, S ^[3]; Keshelashvili, I ^[4]; Khoukaz, A; Mielke, M; Papenbrock, M ^[5]; Kulessa, P ^[6]; Merzliakov, S ^[2]

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1. High Energy Physics Department, Petersburg Nuclear Physics Institute, RU-188350 Gatchina (Russian Federation)
2. Institut fuer Kernphysik and Juelich Centre for Hadron Physics, Forschungszentrum Juelich, D-52425 Juelich (Germany)
3. Physikalisches Institut II, Universitaet Erlangen-Nuernberg, D-91058 Erlangen (Germany)
4. High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia (United States)
5. Institut fuer Kernphysik, Universitaet Muenster, D-48149 Muenster (Germany)
6. H. Niewodniczanski Institute of Nuclear Physics PAN, PL-31342 Cracow (Poland)

Production of the SIGMA{sup +} hyperon through the pp->K{sup +}nSIGMA{sup +} reaction has been investigated at four energies close to threshold, 1.826,1.920,1.958, and 2.020 GeV. At low energies, correlated K{sup +}pi{sup +} pairs can only originate from SIGMA{sup +} production so their measurement allows the total cross section for the reaction to be determined. The results obtained are completely consistent with the values extracted from the study of the K{sup +}-proton correlation spectra obtained in the same experiment. These spectra, as well as the inclusive K{sup +} momentum distributions, also provide conservative upper limits on SIGMA{sup +} production rates. The measurements show a SIGMA{sup +} production cross section that varies roughly like phase space, and, in particular, none of the three experimental approaches used supports the anomalously high, near-threshold pp->K{sup +}nSIGMA{sup +} total cross section previously reported [T. Rozek et al., Phys. Lett. B 643, 251 (2006)].

• OSTI ID: 21388973
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BARYONS
BOSONS
CORRELATIONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY
ENERGY DEPENDENCE
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 01-10
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
KAONS
KAONS PLUS
MATHEMATICAL SPACE
MESONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHASE SPACE
PIONS
PIONS PLUS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PROTONS
PSEUDOSCALAR MESONS
SIGMA BARYONS
SIGMA PARTICLES
SIGMA PLUS PARTICLES
SPACE
SPECTRA
STRANGE MESONS
STRANGE PARTICLES
THRESHOLD ENERGY
TOTAL CROSS SECTIONS