Kaon and pion production in central Si+Au collisions at 14.6<i>A</i>GeV/<i>c</i>

Abbott, T.; Akiba, Y.; Alburger, D.E.; Beavis, D.; Betts, R. R.; Birstein, L.; Bloomer, M. A.; Bond, Peter; Chasman, C.; Chu, Y. Y.; Cole, B.; Costales, J. B.; Crawford, H. J.; Cumming, J. B.; Debbe, R.; Duek, Eliana Aparecida de Rezende; Engelage, J.; Fung, S. Y.; Гродзинс, Л.; Gushue, S.; Hamagaki, H.; Hansén, O.; Hayashi, Shûichi; Homma, S.; Huang, H. Z.; Ikeda, Yuichi; Katcoff, S.; Kaufman, S.; Kimura, Kento; Kitamura, Kazuhiro; Kurita, K.; Ledoux, R. J.; LeVine, M. J.; Miake, Y.; Morse, R. J.; Nagamiya, S.; Olness, J.W.; Parsons, C. G.; Remsberg, L. P.; Sarabura, M.; Shor, A.; Stankus, P. W.; Steadman, S. G.; Stephans, G. S. F.; Sugitate, T.; Tannenbaum, M. J.; Torikoshi, M.; Dijk, J. H. van; Videbæk, F.; Vient, M.; Vincent, P.; Vulgaris, E.; Vutsadakis, V.; Watson, William A.; Wegner, H. E.; Woodruff, D. S.; Wu, Y.; Zajc, W. A.

doi:10.1103/physrevlett.64.847

Cited by 176 publications

(16 citation statements)

References 21 publications

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“…A similar effect has been observed by the E802 collaboration for SiAu collisions at 14.6GeV/c, where the K + /π + ratio is a factor of 3 ± 1 larger than for pp collisions of a similar energy [16]. RQMD was able to give a reasonable explanation of this result [17] in terms of secondary production of K + by meson-baryon interactions, see also [6].…”

Section: Resultssupporting

confidence: 80%

Charged kaon and pion production at midrapidity in proton-nucleus and sulphur-nucleus collisions

Bøggild¹,

Boissevain²,

Dodd³

et al. 1999

Phys. Rev. C

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The NA44 Collaboration has measured charged kaon and pion distributions at midrapidity in sulphur and proton collisions with nuclear targets at 200 and 450 GeV/c per nucleon, respectively. The inverse slopes of kaons, are larger than those of pions. The difference in the inverse slopes of pions, kaons, and protons, all measured in our spectrometer, increases with system size and is consistent with the buildup of collective flow for larger systems. The target dependence of both the yields and inverse slopes is stronger for the sulphur beam, suggesting the increased importance of secondary rescattering for SA reactions. The rapidity density dN/dy of both K ϩ and K Ϫ increases more rapidly with system size than for ϩ in a similar rapidity region.This trend continues with increasing centrality, and according to RQMD, it is caused by secondary reactions between mesons and baryons. The K Ϫ /K ϩ ratio falls with increasing system size but more slowly than the p /p ratio. The Ϫ / ϩ ratio is close to unity for all systems. From pBe to SPb the K ϩ /p ratio decreases whileThese data suggest that as larger nuclei collide, the resulting system has a larger transverse expansion and baryon density and an increasing fraction of strange quarks. ͓S0556-2813͑99͒02201-3͔PACS number͑s͒: 25.75. Ϫq, 13.85.Ϫt, 25.40.Ve

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Section: Resultssupporting

confidence: 80%

Charged kaon and pion production at midrapidity in proton-nucleus and sulphur-nucleus collisions

Bøggild¹,

Boissevain²,

Dodd³

et al. 1999

Phys. Rev. C

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“…[8] 9.7 4.5 Si + Au 18.2±0.9% [8] 3.2±0.3% [8] 102.7 44.0 19.2±3% [10] 3.6±0.8% [10] for K + /π + and K − /π − ratios in constant baryon density as functions of baryon number to be consistent with experimental results. This shows that the increase in K/π ratios along with increasing system size can also be explained without any phase transition or the in-medium effect in kaon masses [11,12,13].…”

Section: K/π Ratios In Ags Experiments E802supporting

confidence: 82%

On the exact conservation laws in thermal models and the analysis of AGS and SIS experimental results

Keränen¹,

Cleymans²,

Suhonen³

1999

J. Phys. G: Nucl. Part. Phys.

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Abstract. The production of hadrons in relativistic heavy ion collisions is studied using a statistical ensemble with thermal and chemical equilibrium. Special attention is given to exact conservation laws, i.e. certain charges are treated canonically instead of using the usual grand canonical approach. For small systems, the exact conservation of baryon number, strangeness and electric charge is to be taken into account. We have derived compact, analytical expressions for particle abundances in such ensemble. As an application, the change in K/π ratios in AGS experiments with different interaction system sizes is well reproduced. The canonical treatment of three charges becomes impractical very quickly with increasing system size. Thus, we draw our attention to exact conservation of strangeness, and treat baryon number and electric charge grand canonically. We present expressions for particle abundances in such ensemble as well, and apply them to reproduce the large variety of particle ratios in GSI SIS 2 A GeV Ni-Ni experiments. At the energies considered here, the exact strangeness conservation fully accounts for strange particle suppression, and no extra chemical factor is needed.

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“…[7]- [11], the kaon yield is also very sensitive to the nuclear equation of state. Furthermore, kaon production in heavy ion collisions may provide clues concerning quark gluon plasma formation from the K/π production ratio [12,13], chiral symmetry restoration [14,15,16], and the existence of density isomers [17]. Thus, many studies of kaon production in heavy ion collisions have been made experimentally and theoretically [18]- [62].…”

Section: Introductionmentioning

confidence: 99%

Resonance model study of kaon production in baryon-baryon reactions for heavy-ion collisions

et al. 1999

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The energy dependence of the total kaon production cross sections in baryon baryon (N and ∆) collisions are studied in the resonance model, which is a relativistic, tree-level treatment. This study is the first attempt to complete a systematic, consistent investigation of the elementary kaon production reactions for both the pion baryon and baryon baryon reactions. Our model suggests that the magnitudes of the isospin-averaged total cross sections for the N N → N Y K and ∆N → N Y K (Y = Λ or Σ) reactions are almost equal at energies up to about 200 MeV above threshold. However, the magnitudes for the ∆N reactions become about 6 times larger than those for the N N reactions at energies about 1 GeV above threshold. Furthermore, the magnitudes of the isospin-averaged total cross sections for the N N → ∆Y K reactions turn out to be comparable to those for the N N → N Y K reactions at N N invariant collision energies about 3.1 GeV, and about 5 to 10 times larger at N N invariant collision energies about 3.5 GeV. The microscopic cross sections are parametrized in all isospin channels necessary for the transport model studies of kaon production in heavy ion collisions. These cross sections are then applied in the relativistic transport model to study the sensitivity to the underlying elementary kaon production cross sections.

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Kaon and pion production in central Si+Au collisions at 14.6AGeV/c

Cited by 176 publications

References 21 publications

Charged kaon and pion production at midrapidity in proton-nucleus and sulphur-nucleus collisions

Charged kaon and pion production at midrapidity in proton-nucleus and sulphur-nucleus collisions

On the exact conservation laws in thermal models and the analysis of AGS and SIS experimental results

Resonance model study of kaon production in baryon-baryon reactions for heavy-ion collisions

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