Subthreshold Xi(-) Production in Collisions of p(3.5 GeV) + Nb

0445104 - ÚJF 2016 RIV US eng J - Článek v odborném periodiku
Agakishiev, G. - Arnold, O. - Balanda, A. - Belver, D. - Krása, Antonín - Křížek, Filip - Kugler, Andrej - Sobolev, Yuri, G. - Tlustý, Pavel - Wagner, Vladimír … celkem 99 autorů
Subthreshold Xi(-) Production in Collisions of p(3.5 GeV) + Nb.
Physical Review Letters. Roč. 114, č. 21 (2015), s. 212301. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA ČR GA13-06759S
Institucionální podpora: RVO:61389005
Klíčová slova: HADES collaboration * heavy ion collisions * Pb-Pb collisions
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 7.645, rok: 2015

Results on the production of the double strange cascade hyperon Xi(-) are reported for collisions of p(3.5 GeV) + Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold Xi(-) production is observed in proton-nucleus interactions. Assuming a Xi(-) phase-space distribution similar to that of. hyperons, the production probability amounts to P Xi- = [2.0 +/- 0.4(stat) +/- 0.3(norm) +/- 0.6(syst)] x 10(-4) resulting in a Xi(-)/d(Lambda + Sigma(0)) ratio of P Xi-/P Lambda+Sigma 0 = [1.2 +/- 0.3(stat) +/- 0.4(syst)] x 10(-2). Available model predictions are significantly lower than the measured Xi(-) yield.
Trvalý link: http://hdl.handle.net/11104/0247519