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

Tsushima, K.; Sibirtsev, A.; Thomas, A. W.; Li, G. Q.

doi:10.1103/physrevc.59.369

Cited by 148 publications

(160 citation statements)

References 78 publications

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“…This enhancement is a consequence of the larger production cross section in the N∆ and ∆∆ channels from Ref. [43] (as also used in Refs. [16,17]).…”

Section: Gev Have Been Extrapolated From the Vacuum Amplitudes In An mentioning

confidence: 97%

Kaons and antikaons in hot and dense hadronic matter

Bratkovskaya²,

et al. 2004

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The medium modification of kaon and antikaon masses, compatible with low energy KN scattering data, are studied in a chiral SU(3) model. The mutual interactions with baryons in hot hadronic matter and the effects from the baryonic Dirac sea on the K(K) masses are examined.The in-medium masses from the chiral SU(3) effective model are compared to those from chiral perturbation theory. Furthermore, the influence of these in-medium effects on kaon rapidity distributions and transverse energy spectra as well as the K,K flow pattern in heavy-ion collision experiments at 1.5 to 2 A·GeV are investigated within the HSD transport approach. Detailed predictions on the transverse momentum and rapidity dependence of directed flow v 1 and the elliptic flow v 2 are provided for Ni+Ni at 1.93 A·GeV within the various models, that can be used to determine the in-medium K ± properties from the experimental side in the near future.

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“…This enhancement is a consequence of the larger production cross section in the N∆ and ∆∆ channels from Ref. [43] (as also used in Refs. [16,17]).…”

Section: Gev Have Been Extrapolated From the Vacuum Amplitudes In An mentioning

confidence: 97%

Kaons and antikaons in hot and dense hadronic matter

Bratkovskaya²,

et al. 2004

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“…More recent calculations by Tsushima et al [36] are based on a resonance model where it is assumed that an excited baryon, B * (N * or ∆ * ), is produced via meson (π, η, ρ) exchange (pp → pB…”

Section: Total Cross Sectionsmentioning

confidence: 99%

“…In view of the experimental and theoretical progress made for the pK + Λ and pK + Σ 0 final states, in particular data at lower excess energies are highly desirable. This would render possible the further development of more recent theoretical approaches [34,35,36], which now also include, apart from kaon and pion exchange, a production scenario involving intermediate baryon resonances (pp → B * p; B * = N * , ∆ * ; B * → K 0 Σ + , see fig. 1c).…”

Section: Introductionmentioning

confidence: 99%

The pK0Σ+ final state in proton-proton collisions

Abdel-Bary¹,

Abdel‐Samad²,

Brinkmann³

et al. 2012

Eur. Phys. J. A

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Abstract. This paper reports results from a study of the reaction pp → pK 0 Σ + at beam momenta of p beam = 2950, 3059, and 3200 MeV/c (excess energies of ǫ = 126, 161, and 206 MeV). Total cross sections were determined for all energies; a set of differential cross sections (Dalitz plots; invariant mass spectra of all two-body subsystems; angular distributions of all final state particles; distributions in helicity and Jackson frames) are presented for ǫ = 161 MeV. The total cross sections are proportional to the volume of available three-body phase-space indicating that the transition matrix element does not change significantly in this range of excess energies. It is concluded from the differential data that the reaction proceeds dominantly via the N (1710)P11 and/or N (1720)P13 resonance(s); N (1650)S11 and ∆(1600)P33 could also contribute. PACS. 13.75.Cs Nucleon-nucleon interactions -13.75.-n Hadron-induced low-and intermediate-energy reactions and scattering (energy ≤ 10 GeV) -13.75.Ev Hyperon-nucleon interactions -25.40.Ve Other reactions above meson production thresholds (energies > 400 MeV)

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“…Studies of the production ratio in [13] consider two different models: either a π plus K exchange approach or the excitation of intermediate N * resonances via an exchange of π-and heavier non-strange mesons, where the N * 's couple to the K + Y channel [14], however, any interference of the amplitudes are neglected.…”

Section: Pacsmentioning

confidence: 99%

Associated strangeness production at threshold

et al. 2003

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Abstract. The associated strangeness dissociation at threshold has been studied at the COSY-11 facility measuring the hyperon -and the K + K − meson pair production. Measurements of the near threshold Λ and Σ 0 production via the pp → pK + Λ/Σ 0 reaction [1] at COSY-11 have shown that the Λ/Σ 0 cross section ratio exceeds the value at high excess energies (Q ≥ 300 MeV [2]) by an order of magnitude. For a better understanding additional data have been taken between 13 MeV and 60 MeV excess energy. The near threshold production of the charged kaon-antikaon pair is related to the discussion about the nature of the scalar states in the 1 GeV/c 2 mass range, i.e. the f0 (980) and a0 (980) [3]. The interpretation as a KK molecule is strongly dependent on the K-K interaction which can be studied via the production channel. A first total cross section value on the reaction pp → ppK + K − at an excess energy of 17 MeV [4] i.e. below the φ production threshold was measured. One of the main investigations of the COSY-11 collaboration is the associated strangeness production of the neutral Λ and Σ 0 hyperons in the reactions pp → pK + Λ/Σ 0 . Since the quark structures of these hyperons are analogous to each other one can expect similar production mechanisms. In such a case the cross section ratio PACSσ(pp→pK + Σ 0 ) should be mainly determined by the isospin relation which leads to R Λ/Σ 0 = 3 what is in line with the ratio of about 2.5 observed at high excess energies (Q ≥ 300 MeV) [2]. Very close to threshold, in the range of excess energies Q ≤ 13 MeV, the total cross sections for the Λ and Σ 0 hyperon production were measured exclusively at the COSY-11 facility [5,6] at COSY Jülich [7]. The most remarkable feature of the data [1,8] was that at the same excess energy the total cross section for the Σ 0 production appeared to be about a factor of 28 +6 −9 smaller than for the Λ particle.Enhancements in the missing mass distribution at the Λp and ΣN thresholds observed in inclusive K + production data, taken at SPES 4 [9] in proton-proton scattering at Q = 252 MeV, both having about the same magnitude, suggest a strong ΣN → Λp final state conversion. This conversion might be responsible for the decrease of the Σ 0 production yield close to threshold as seen in the COSY-11 data. Strong ΣN → Λp conversion effects are also suggested when interpreting the results of K − scattering on deuterons [10] where a sharp peak is clearly seen at an effective mass of the Λ-proton system m Λp = 2131 MeV/c 2 corresponding exactly to the Σ 0 p threshold.However, in calculations within the Jülich meson exchange model [11] the final state conversion is rather excluded as a dominant origin of the observed Σ 0 suppression. In these calculations both π and K exchange are taken into account with inclusion of the final state interaction (FSI) effects. Λ production is found to be dominated by kaon exchange, what is in line with the experimental results obtained by the DISTO collaboration [12] at higher excess energies (Q = 430 MeV), where the impo...

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

Cited by 148 publications

References 78 publications

Kaons and antikaons in hot and dense hadronic matter

Kaons and antikaons in hot and dense hadronic matter

The pK0Σ+ final state in proton-proton collisions

Associated strangeness production at threshold

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