Transport dynamics of broad resonances

Knoll, J.; Darmstadt,

doi:10.1016/s0146-6410(99)00072-1

Cited by 15 publications

(22 citation statements)

References 34 publications

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“…This concept was first addressed by Kadanoff and Baym [2] in the chapter "Slowly varying disturbances", Eqs. (9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25). Motivated by applications for the description of heavy-ion collisions further attempts were recently suggested [18][19][20][21][22][23] based on the so called BotermansMalfliet (BM) substitution [10].…”

Section: Introductionmentioning

confidence: 99%

Exact Conservation Laws of the Gradient Expanded Kadanoff–Baym Equations

Knoll¹,

Ivanov²,

Voskresensky³

2001

Annals of Physics

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109

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It is shown that the Kadanoff-Baym equations at consistent first-order gradient approximation reveal exact rather than approximate conservation laws related to global symmetries of the system. The conserved currents and energy-momentum tensor coincide with corresponding Noether quantities in the local approximation. These exact conservations are valid, provided a Φ derivable approximation is used to describe the system, and possible memory effects in the collision term are also consistently evaluated up to first-order gradients.

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Section: Introductionmentioning

confidence: 99%

Exact Conservation Laws of the Gradient Expanded Kadanoff–Baym Equations

Knoll¹,

Ivanov²,

Voskresensky³

2001

Annals of Physics

Self Cite

109

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“…discussion in Ref. [63,70]). It might be interesting to investigate these two scenarios more in detail in the future.…”

Section: Decomposition Of the Cascade Contribution And Discussionmentioning

confidence: 94%

“…Refs. [63][64][65][66][67][68][69]; for an overview we refer the reader to the recent critical review by J. Knoll [70]. Emission from the stage preceding the hydrodynamical evolution is typically small, since the geometrical criterium adopted to start the hydrodynamical evolution corresponds to a starting time t start ≈ 1.16 fm at top SPS energy.…”

Section: A the Hybrid Approachmentioning

confidence: 99%

Dimuon radiation at relativistic energies available at the CERN Super Proton Synchrotron within a (3 + 1)D hydrodynamic + cascade model

et al. 2011

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We analyze dilepton emission from hot and dense matter using a hybrid approach based on the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) transport model with an intermediate hydrodynamic stage for the description of heavy-ion collisions at relativistic energies. During the hydrodynamic stage, the production of lepton pairs is described by radiation rates for a strongly interacting medium in thermal equilibrium. In the low mass region, hadronic thermal emission is evaluated assuming vector meson dominance including in-medium modifications of the ρ meson spectral function through scattering from nucleons and pions in the heat bath. In the intermediate mass region, the hadronic rate is essentially determined by multi-pion annihilation processes. Emission from quark-antiquark annihilation in the quark gluon plasma is taken into account as well.When the system is sufficiently dilute, the hydrodynamic description breaks down and a transition to a final cascade stage is performed. In this stage dimuon emission is evaluated as commonly done in transport models. Focusing on the enhancement with respect to the contribution from long-lived hadron decays after freezout observed at the SPS in the low mass region of the dilepton spectra, the relative importance of the different thermal contributions and of the two dynamical stages is investigated. We find that three separated regions can be identified in the invariant mass spectra. Whereas the very low and the intermediate mass regions mostly receive contribution from the thermal dilepton emission, the region around the vector meson peak is dominated by the cascade emission. Above the ρ-peak region the spectrum is driven by QGP radiation. Analysis of the dimuon transverse mass spectra reveals that the thermal hadronic emission shows an evident mass ordering not present in the emission from the QGP. A comparison of our calculation to recent acceptance corrected NA60 data on invariant as well as transverse mass spectra is performed.

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“…For the mass line shapes of the narrow resonances η, ω and φ, a modified relativistic Breit-Wigner parametrization was used, first proposed by Gounaris and Sakurai [15], with widths and masses taken from the Particle Data Group (PDG) tables [16]. For the broad ρ meson the following parameterisation was used [17]:…”

Section: Monte Carlo Simulations Acceptance and Reconstruction Efficmentioning

confidence: 99%

Nuclear dependence of light neutral meson production in p–A collisions at 400 GeV with NA60

Arnaldi¹,

Borer²,

Castor³

et al. 2019

Eur. Phys. J. C

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The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets, using a 400 GeV proton beam at the CERN SPS. The transverse momentum spectra of the ρ/ω and φ mesons are measured in the full p T range accessible, from p T = 0 up to 2 GeV/c. The nuclear dependence of the production cross sections of the η, ω and φ mesons has been found to be consistent with the power law σ pA ∝ A α , with the α parameter increasing as a function of p T for all the particles, and an approximate hierarchy α η ≈ α φ > α ω . The cross section ratios σ η /σ ω , σ ρ /σ ω and σ φ /σ ω have been studied as a function of the size A of the production target, and an increase of the η and φ yields relative to the ω is observed from p-Be to p-U collisions. a

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Transport dynamics of broad resonances

Cited by 15 publications

References 34 publications

Exact Conservation Laws of the Gradient Expanded Kadanoff–Baym Equations

Exact Conservation Laws of the Gradient Expanded Kadanoff–Baym Equations

Dimuon radiation at relativistic energies available at the CERN Super Proton Synchrotron within a (3 + 1)D hydrodynamic + cascade model

Nuclear dependence of light neutral meson production in p–A collisions at 400 GeV with NA60

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