Baryonic resonances close to the (K)over-barN threshold: The case of Lambda (1405) in pp collisions

0391528 - ÚJF 2014 RIV US eng J - Článek v odborném periodiku
Agakishiev, G. - Balanda, A. - Belver, D. - Belyaev, A. - Berger-Chen, J. C. - Blanco, A. - Böhmer, M. - Boyard, J. L. - Cabanelas, P. - Castro, E. - Chernenko, S. - Christ, T. - Destefanis, M. - Dohrmann, F. - Krása, Antonín - Křížek, Filip - Kugler, Andrej - Sobolev, Yuri, G. - Tlustý, Pavel - Wagner, Vladimír … celkem 103 autorů
Baryonic resonances close to the (K)over-barN threshold: The case of Lambda (1405) in pp collisions.
Physical Review. C. Roč. 87, č. 2 (2013), 025201. ISSN 0556-2813
Grant CEP: GA MŠMT LC07050; GA AV ČR IAA100480803
Institucionální podpora: RVO:61389005
Klíčová slova: HADES * photoproduction * cross section
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 3.881, rok: 2013
http://prc.aps.org/pdf/PRC/v87/i2/e025201

We present an analysis of the Lambda(1405) resonance produced in the reaction p + p -> Sigma(+/-) + pi(-/+) + K+ + p at 3.5 GeV kinetic beam energy measured with the High Acceptance Dielectron Spectrometer (HADES) at the Gesellschaft fur Schwerionenforschung (GSI). The two charged decay channels Lambda (1405) -> Sigma(+/-) + pi(-/+) have been reconstructed for the first time in p + p collisions. The efficiency and acceptance- corrected spectral shapes show a peak position clearly below 1400MeV/c(2). We find a total production cross section of sigma(Lambda(1405)) = (1405) = 9.2 +/- 0.9 +/- 0.7(-1.0)(+3.3)mu b . The analysis of its polar angle distribution suggests that the Lambda(1405) is produced isotropically in the p - p center-of-mass system (CMS).
Trvalý link: http://hdl.handle.net/11104/0220558