Subthreshold antiproton production in nucleus-nucleus collisions

Ko, Che Ming; Xia, L. H.

doi:10.1103/physrevc.49.1139

Cited by 59 publications

(93 citation statements)

References 43 publications

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“…There have been also several investigations on subthreshold antikaon production [58,72,[94][95][96]. In this paper, we will concentrate on comparisons with recent data from the KaoS collaboration for Ni+Ni collisions [22] using the new sets of elementary cross sections as outlined in subsections A-C. We consider two scenarios, namely, with and without kaon medium effects.…”

Section: G Kaon and Antikaon Production In Heavy-ion Collisionsmentioning

confidence: 99%

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Kaons in dense matter, kaon production in heavy-ion collisions, and kaon condensation in neutron stars

1997

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The recent past witnesses the growing interdependence between the physics of hadrons, the physics of relativistic heavy-ion collisions, and the physics of compact objects in astrophysics. A notable example is the kaon which plays special roles in all the three fields. In this paper, we first review the various theoretical investigations of kaon properties in nuclear medium, focusing on possible uncertainties in each model. We then present a detailed transport model study of kaon production in heavy-ion collisions at SIS energies. We shall discuss especially the elementary kaon and antikaon production cross sections in hadron-hadron interactions, that represent one of the most serious uncertainties in the transport model study of particle production in heavy-ion collisions. The main purpose of such a study is to constrain kaon in-medium properties from the heavy-ion data. This can provide useful guidances for the development of theoretical models of the kaon in medium. In the last part of the paper, we apply the kaon in-medium properties extracted from heavy-ion data to the study of neutron star properties. Based on a conventional equation of state of nuclear matter that can be considered as one of the best constrained by available experimental data on finite nuclei, we find that the maximum mass of neutron stars is about 2M⊙, which is reduced to about 1.5M⊙ once kaon condensation as constrained by heavy-ion data is introduced.pacs: 25.75. Dw, 97.60.Jd, 26.60.+c, 24.10.Lx

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Section: G Kaon and Antikaon Production In Heavy-ion Collisionsmentioning

confidence: 99%

“…Instead of the usual linear and non-linear σ-ω [83] as in Refs. [80][81][82], we base our model on an effective chiral Lagrangian recently developed by Furnstahl, Tang, and Serot [31], which will also be used in our studies of neutron star properties.…”

Section: E Relativistic Transport Modelmentioning

confidence: 99%

Kaons in dense matter, kaon production in heavy-ion collisions, and kaon condensation in neutron stars

1997

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“…The role of the Dirac sea in such collisions is discussed in [Ju92]. The production of kaons is examined in [Fa93,Fa93a,Fa94] and of antinucleons, in [Te93,Te94,Li94].…”

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confidence: 99%

Recent Progress in Quantum Hadrodynamics

Serot

Walecka

1997

Int. J. Mod. Phys. E

1,000

1,511

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Quantum hadrodynamics (QHD) is a framework for describing the nuclear many-body problem as a relativistic system of baryons and mesons. Motivation is given for the utility of such an approach and for the importance of basing it on a local, Lorentz-invariant lagrangian density. Calculations of nuclear matter and finite nuclei in both renormalizable and nonrenormalizable, effective QHD models are discussed. Connections are made between the effective and renormalizable models, as well as between relativistic mean-field theory and more sophisticated treatments. Recent work in QHD involving nuclear structure, electroweak interactions in nuclei, relativistic transport theory, nuclear matter under extreme conditions, and the evaluation of loop diagrams is reviewed.

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“…In the present study, we include both the partonic potentials from the Nambu-Jona-Lasinio (NJL) model [17] and the hadronic potentials that were known in the literature on subthreshold particle production in heavy-ion collisions [18,19]. To reproduce quantitatively the relative v 2 difference for p andp as well as K + and K − in mini-bias Au+Au collisions at √ s N N = 7.7 GeV, we find that the ratio R V of the vector coupling G V to the scalar-pseudoscalar coupling G in the NJL model is constrained to values between 0.5 and 1.1.…”

mentioning

confidence: 99%

“…For the hadronic potentials, they are included as in our previous work [15] using the phenomenologically determined relativistic mean-field model [18] for nucleons and antinucleons, and effective chiral Lagrangian [19] for kaons and antikaons. Due to the G-parity invariance, the potential for antinucleons is much more attractive than that for nucleons, and that for kaons is slightly repulsive while that for antikaons is deeply attractive in a baryonrich hadronic matter.…”

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confidence: 99%

Elliptic Flow Splitting as a Probe of the QCD Phase Structure at Finite Baryon Chemical Potential

Song

et al. 2014

Phys. Rev. Lett.

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Using a partonic transport model based on the 3-flavor Nambu-Jona-Lasinio model and a relativistic hadronic transport model to describe, respectively, the evolution of the initial partonic and the final hadronic phase of heavy-ion collisions at energies carried out in the Beam-Energy Scan program of the Relativistic Heavy Ion Collider, we have studied the effects of both the partonic and hadronic mean-field potentials on the elliptic flow of particles relative to that of their antiparticles. We find that to reproduce the measured relative elliptic flow differences between nucleons and antinucleons as well as between kaons and antikaons requires a vector coupling constant as large as 0.5 to 1.1 times the scalar coupling constant in the Nambu-Jona-Lasinio model. Implications of our results in understanding the QCD phase structure at finite baryon chemical potential are discussed.PACS numbers: 25.75.Ld, 25.75.Nq, 21.30.Fe, 24.10.Lx The main purpose of the experiments involving collisions of heavy nuclei at relativistic energies is to study the properties of produced quark-gluon plasma (QGP) and its phase transition to hadrons. It is known from the lattice Quantum Chromodynamics (QCD) that for QGP of small baryon chemical potential, such as that formed at top energies of the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), the hadron-quark phase transition (HQPT) is a smooth crossover [1,2]. For QGP of finite baryon chemical potential produced at lower collision energies, studies based on various theoretical models have indicated, however, that the HQPT is expected to change to a first-order one [3][4][5][6]. To determine if the critical point, at which the crossover HQPT changes to a first-order one, exists and where it is located in the QCD phase diagram is important for understanding the phase structure of QCD and thus the nature of the strong interaction. To search for the critical point, the Beam-Energy Scan (BES) program has been carried out at RHIC to look for its signals at lower collision energies of √ s N N = 7.7 ∼ 39 GeV.Although there is no definitive conclusion on the existence or the location of the critical point, many interesting phenomena different from those at higher collision energies have been observed [7,8]. Among them is the increasing splitting between the elliptic flow (v 2 ) of particles, i.e, the second Fourier coefficient in the azimuthal distribution of their momenta in the plane perpendicular to the participant or reaction plane, and that of their antiparticles with decreasing collision energy [9]. This result also indicates the breakdown of the number of constituent quark scaling of v 2 [10] at lower collision energies. The latter states that the scaled elliptic flow, which is obtained from dividing the hadron elliptic flow by its * Electronic address: xujun@sinap.ac.cn number of constituent quarks as a function of a similarly scaled transverse kinetic energy, is similar for all hadrons, and this has been considered as an evidence for the existence of QGP...

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Subthreshold antiproton production in nucleus-nucleus collisions

Cited by 59 publications

References 43 publications

Kaons in dense matter, kaon production in heavy-ion collisions, and kaon condensation in neutron stars

Kaons in dense matter, kaon production in heavy-ion collisions, and kaon condensation in neutron stars

Recent Progress in Quantum Hadrodynamics

Elliptic Flow Splitting as a Probe of the QCD Phase Structure at Finite Baryon Chemical Potential

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