Associate K-0 production in p plus p collisions at 3.5 GeV: The role of Delta(1232)(++)

0433169 - ÚJF 2015 RIV US eng J - Článek v odborném periodiku
Agakishiev, G. - Arnold, O. - Belver, D. - Belyaev, A. - Berger-Chen, J. C. - Blanco, A. - Böhmer, M. - Boyard, J. L. - Cabanelas, P. - Chernenko, S. - Dybczak, A. - Epple, E. - Fabbietti, L. - Fateev, O. - Finocchiaro, P. - Krása, Antonín - Křížek, Filip - Kugler, Andrej - Sobolev, Yuri, G. - Tlustý, Pavel - Wagner, Vladimír … celkem 95 autorů
Associate K-0 production in p plus p collisions at 3.5 GeV: The role of Delta(1232)(++).
Physical Review. C. Roč. 90, č. 1 (2014), 015202. ISSN 0556-2813
Grant CEP: GA MŠMT LC07050; GA AV ČR IAA100480803; GA MŠMT LG14004
Institucionální podpora: RVO:61389005
Klíčová slova: HADES * strange particle production * proton-proton interactions
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 3.733, rok: 2014

An exclusive analysis of the four-body final states Lambda + p + pi(+) + K-0 and Sigma(0) + p + pi(+) + K-0 measured with HADES for p + p collisions at a beam kinetic energy of 3.5 GeV is presented. The analysis uses various phase space variables, such as missing mass and invariant mass distributions, in the four-particle event selection (p,pi(+),pi(+),pi(-)) to find cross sections of the different production channels, contributions of the intermediate resonances Delta(++) and Sigma(1385)(+), and corresponding angular distributions. A dominant resonant production is seen, where the reaction Lambda + Delta(++) + K-0 has a cross section about ten times higher (29.45 +/- 0.08(-1.46)(+1.67) +/- 2.06 mu b) than the analogous nonresonant reaction (2.57 +/- 0.02(-1.98)(+0.21) +/- 0.18 mu b). A similar result is obtained in the corresponding Sigma(0) channels with 9.26 +/- 0.05(-0.31)(+1.41) +/- 0.65 mu b in the resonant and 1.35 +/- 0.02(-1.35)(+0.10) +/- 0.09 mu b in the nonresonant reactions.
Trvalý link: http://hdl.handle.net/11104/0237444