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Statements

Subject Item
n2:RIV%2F68407700%3A21340%2F12%3A00199153%21RIV13-MSM-21340___
rdf:type
n10:Vysledek skos:Concept
rdfs:seeAlso
http://prc.aps.org/abstract/PRC/v86/i5/e054909
dcterms:description
The High Acceptance Di-Electron Spectrometer (HADES) data on strangeness production in Ar + KCl collisions at 1.76 A GeV are analyzed within a minimal statistical model. In the model the total negative strangeness content is fixed by the observed K+ multiplicities. Particles with negative strangeness are assumed to remain in chemical equilibrium with themselves and in thermal equilibrium with the environment until a common freeze-out. Exact strangeness conservation in each collision event is explicitly preserved. This implies that Xi baryons can be released only in events where two or more kaons are produced. An increase of the fireball volume due to application of a centrality trigger in HADES experiments is taken into account. We find that experimental ratios of K-/K+, Lambda/K+, and Sigma/K+ can be satisfactorily described provided in-medium potentials are taken into account. However, the calculated Xi(-)/Lambda/K+ ratio proves to be significantly smaller compared to the measured value (eight times less than the experimental median value and three times less than the lower error bar). Various scenarios to explain observed Xi enhancement are discussed. Arguments are given in favor of the Xi production in direct reactions. The rates of the possible production processes are estimated and compared. The High Acceptance Di-Electron Spectrometer (HADES) data on strangeness production in Ar + KCl collisions at 1.76 A GeV are analyzed within a minimal statistical model. In the model the total negative strangeness content is fixed by the observed K+ multiplicities. Particles with negative strangeness are assumed to remain in chemical equilibrium with themselves and in thermal equilibrium with the environment until a common freeze-out. Exact strangeness conservation in each collision event is explicitly preserved. This implies that Xi baryons can be released only in events where two or more kaons are produced. An increase of the fireball volume due to application of a centrality trigger in HADES experiments is taken into account. We find that experimental ratios of K-/K+, Lambda/K+, and Sigma/K+ can be satisfactorily described provided in-medium potentials are taken into account. However, the calculated Xi(-)/Lambda/K+ ratio proves to be significantly smaller compared to the measured value (eight times less than the experimental median value and three times less than the lower error bar). Various scenarios to explain observed Xi enhancement are discussed. Arguments are given in favor of the Xi production in direct reactions. The rates of the possible production processes are estimated and compared.
dcterms:title
Strangeness balance in HADES experiments and the Xi(-) enhancement Strangeness balance in HADES experiments and the Xi(-) enhancement
skos:prefLabel
Strangeness balance in HADES experiments and the Xi(-) enhancement Strangeness balance in HADES experiments and the Xi(-) enhancement
skos:notation
RIV/68407700:21340/12:00199153!RIV13-MSM-21340___
n10:predkladatel
n15:orjk%3A21340
n3:aktivita
n8:Z n8:P
n3:aktivity
P(LA08015), Z(MSM6840770039)
n3:cisloPeriodika
5
n3:dodaniDat
n16:2013
n3:domaciTvurceVysledku
Tomášik, Boris
n3:druhVysledku
n18:J
n3:duvernostUdaju
n21:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
171530
n3:idVysledku
RIV/68407700:21340/12:00199153
n3:jazykVysledku
n12:eng
n3:klicovaSlova
HEAVY-ION COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; SCALED HADRON MASSES; EQUATION-OF-STATE; KAON PRODUCTION; SIS ENERGIES; ANTIKAON PRODUCTION; CASCADE PRODUCTION; BEAM ENERGIES; DENSE MATTER
n3:klicoveSlovo
n4:NUCLEUS-NUCLEUS%20COLLISIONS n4:SIS%20ENERGIES n4:DENSE%20MATTER n4:EQUATION-OF-STATE n4:HEAVY-ION%20COLLISIONS n4:SCALED%20HADRON%20MASSES n4:ANTIKAON%20PRODUCTION n4:BEAM%20ENERGIES n4:CASCADE%20PRODUCTION n4:KAON%20PRODUCTION
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[3EB9A15C791C]
n3:nazevZdroje
Physical Review C
n3:obor
n19:BF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:projekt
n6:LA08015
n3:rokUplatneniVysledku
n16:2012
n3:svazekPeriodika
86
n3:tvurceVysledku
Kolomeitsev, E. E. Voskresensky, D. N. Tomášik, Boris
n3:wos
000311546200011
n3:zamer
n13:MSM6840770039
s:issn
0556-2813
s:numberOfPages
12
n9:doi
10.1103/PhysRevC.86.054909
n20:organizacniJednotka
21340