Refine
Year of publication
Document Type
- Preprint (221) (remove)
Language
- English (221) (remove)
Has Fulltext
- yes (221)
Is part of the Bibliography
- no (221)
Keywords
- Kollisionen schwerer Ionen (33)
- heavy ion collisions (27)
- Quark-Gluon-Plasma (14)
- equation of state (12)
- QGP (11)
- Quark Gluon Plasma (9)
- quark (9)
- quark-gluon plasma (9)
- Hadron (8)
- Zustandsgleichung (8)
- collision (8)
- heavy-ion collisions (8)
- Meson (7)
- meson (7)
- quark gluon plasma (7)
- Energie (6)
- Kollision (6)
- Quanten-Chromodynamik (6)
- Quark (6)
- UrQMD (6)
- heavy ion collision (6)
- LHC (5)
- MEMOs (5)
- QCD (5)
- Quantum Chromodynamic (5)
- RHIC (5)
- baryon (5)
- energy (5)
- hadronic (5)
- quark-gluon-plasma (5)
- relativistic (5)
- Dirac (4)
- Quark Materie (4)
- Relativistic heavy-ion collisions (4)
- SPS (4)
- hadron (4)
- heavy ion colliders (4)
- nucleon (4)
- quark matter (4)
- Bremsstrahlung (3)
- Molekulare Dynamik (3)
- Neutronenstern (3)
- Nukleon (3)
- RQMD (3)
- Strahl (3)
- Strangelets (3)
- Ultrarelativistic Quantum Molecular Dynamics (3)
- Zustandsgleichungen (3)
- black holes (3)
- bremsstrahlung (3)
- gluon (3)
- hadronic matter (3)
- hydrodynamical model (3)
- hydrodynamisches Modell (3)
- jet (3)
- kaon (3)
- neutron star (3)
- nuclear collisions (3)
- relativistic quantum molecular dynamics (3)
- relativistisch (3)
- schwere Ion Kollision (3)
- strangelets (3)
- Dichte (2)
- Dirac-Brueckner theory (2)
- Dirac-Brückner Theorie (2)
- Drell-Yan (2)
- Kaon (2)
- Kerne (2)
- Lagrangian (2)
- Materie (2)
- Meson production (2)
- Nambu Jona-Lasinio Modell (2)
- Nambu Jona-Lasinio model (2)
- Partikelspektren (2)
- Phasenübergang (2)
- Plasma (2)
- QMD (2)
- Quanten Chromodynamik (2)
- Quantenchromodynamik (2)
- Quantum Chromodynamics (2)
- Quantum Molecular Dynamics (2)
- Quark gluon Plasma (2)
- Quark-Gluon Plasma (2)
- Teilchen (2)
- Temperatur (2)
- UrQMD Modell (2)
- Walecka model (2)
- antibaryon (2)
- antikaon (2)
- bound state (2)
- degrees of freedom (2)
- dense matter (2)
- dichte Materie (2)
- freeze out (2)
- große Extradimensionen (2)
- hadronische Materie (2)
- kinetic equation (2)
- kinetische Gleichung (2)
- large extra dimensions (2)
- masse (2)
- matter (2)
- nuclear broadening effect (2)
- nuclear matter (2)
- nuclei (2)
- particle spectra (2)
- particles (2)
- plasma (2)
- prompt photon (2)
- relativistic heavy ion collision (2)
- relativistische schwere Ion Kollision (2)
- schwarze Löcher (2)
- schwere Ion-Kollision (2)
- schwere Ion-Kollisionen (2)
- statistical coalescence model (2)
- statistisches Fusionsmodell (2)
- strange hadronic matter (2)
- temperature (2)
- thermalization (2)
- ultrarelativistisch (2)
- ultrarelativistische (2)
- (QGP) (1)
- AGS (1)
- Absorption (1)
- Anisotropic flow (1)
- Anti-Kaon (1)
- Antikaon (1)
- Antiteilchen (1)
- Ausfrieren (1)
- Baryon (1)
- Bjorken Modell (1)
- Bjorken model (1)
- Boltzmann-Uehling-Uhlenbeck (1)
- Boltzmann-Uehling-Uhlenbeck Gleichung (1)
- Boltzmann-Uehling-Uhlenbeck equation (1)
- CDM (1)
- Charm Produktion (1)
- Charmed mesons (1)
- Charmed quarks (1)
- Charmonium (1)
- Charmonium Produktion (1)
- Charmonium production (1)
- Chemical equilibration (1)
- Chemikalie (1)
- Chemische Gleichgewichtherstellung (1)
- Chiral symmetries (1)
- Cluster distribution (1)
- Cluster integrals (1)
- Collision (1)
- Conservation Laws (1)
- D-Dbar (1)
- D-meson spectral density (1)
- DN interaction (1)
- Deuteron (1)
- Dielectron (1)
- Dielektron (1)
- Dilepton (1)
- Drell-Yan production (1)
- Drell-Yan ratio (1)
- Drell-Yan-Prozess (1)
- Dynamik (1)
- Dyson-Schwinger equation (1)
- EOS (1)
- Elektron (1)
- Elementarteilchen (1)
- Elementary particle (1)
- Equation of State (1)
- Ereignisschwankungen (1)
- Erhaltungsgesetz (1)
- Event-by-event fluctuations (1)
- Freeze Out (1)
- Freeze out (1)
- Freiheitsgrad (1)
- Freiheitsgrade (1)
- Gluon (1)
- Gluon-Plasma (1)
- Gyromagnetic Moment (1)
- HICs (1)
- Hadron Gas Modell (1)
- Hadron Materie (1)
- Hadronenbeschleuniger (1)
- Hartree (1)
- Heavy ion collisions (1)
- High Energy Physics - Phenomenology (1)
- Hohe Energie (1)
- Homogeneous nucleation (1)
- Hypermaterie (1)
- IQMD Modell (1)
- IQMD model (1)
- In-Medium Zerfall (1)
- J/psi yield (1)
- J/ϕ (1)
- K-Meson (1)
- Kaons (1)
- Kern-Kern Kollision (1)
- Kernkollision (1)
- Kernkollisionen (1)
- Kernmaterie (1)
- Kernreaktion Modell und Methoden (1)
- Kollisionen des schweren Ions (1)
- Kollisionen schwere Ionen (1)
- Korrelation (1)
- Kosmischer Strahl (1)
- Lagrangian . equation of state (1)
- Lambda-c(2593) resonance (1)
- Large Hadron Collider (1)
- Lorentz (1)
- Lorentz contraction (1)
- Mach Shocks (1)
- Masse (1)
- Massenspektrum (1)
- Metastable Exotic Multistrange Objects (1)
- Modell (1)
- Monte-Carlo model for relativistic heavy ion collisions (1)
- Nambu Jona Lasinio Modell (1)
- Nambu Jona Lasinio model (1)
- Nambu-Jona-Lasinio (1)
- Nambu-Jona-Lasinio Modell (1)
- Nambu-Jona-Lasinio model (1)
- Neutron (1)
- Nichtumkehrbarkeit (1)
- Nuclear Theory (1)
- Nuclear-reaction models and methods (1)
- Nucleon (1)
- OMD (1)
- Particle Spectra (1)
- Partikelzahlschwankung (1)
- Pb+Pb collisions (1)
- Photon (1)
- Pion (1)
- Pion Gas (1)
- Potential (1)
- Produktion von pentaquark (1)
- Protonen (1)
- QCD medium (1)
- QCD plasma (1)
- QGP hadrons phase transition (1)
- QGP signals (1)
- QMC (1)
- Quanten Chromodynamic (1)
- Quanten-Molekular-Dynamic (1)
- Quanten-Molekular-Dynamik (1)
- Quantendynamik (1)
- Quantum chromodynamics (1)
- Quark Antiquark (1)
- Quark-Sterne (1)
- Quarkonium (1)
- RHIC energies (1)
- Raum Zeit (1)
- Relativistic Excluded Volumes (1)
- Relativistic Heavy Ion Collider (1)
- Relativistisch (1)
- Relativistische Kollisionen des schwere Ions (1)
- Rho-Meson (1)
- SENECA model (1)
- SHM (1)
- SU (3) - Modell (1)
- SU (3) - Symmetrie (1)
- SU (3) Modell (1)
- SU(3) model (1)
- SU(3)-model (1)
- SU(3)-symmetry (1)
- Schwerionenphysik (1)
- Skalarpotential (1)
- Spektren (1)
- Statistical model (1)
- Super Proton Synchrotron (1)
- Symmetrie (1)
- Teilchenbeschleuniger (1)
- Teilchenspektren (1)
- Teilchenverteilung (1)
- Tevatron (1)
- Transport (1)
- Two-component and Multi-component Hadron Gas (1)
- URQMD (1)
- Ultra-relativistic Quantum Molecular Dynamic (1)
- Ultra-relativistic Quantum Molecular Dynamics model (1)
- Ultrarelativisitic Quantum Molecular Dynamics model (1)
- Ultrarelativisitisches (1)
- Ultrarelativistic Quantum Molecular Model (1)
- Ultrarelativistisches Quant Molekular Dynamik (1)
- Ultrarelativistisches Quant Molekulares Modell (1)
- UrQMD model (1)
- Van der Waals (1)
- Van der Waals Excluded Volume Model (1)
- Van der Waals model (1)
- Vektorpotential (1)
- Verbreitung (1)
- Vielkörperkorrelationen (1)
- Walecka Modell (1)
- Walecka-Modell (1)
- Walecka-model (1)
- Zusammenstoß (1)
- absorption (1)
- anti-kaon (1)
- antiparticles (1)
- black hole (1)
- broadening (1)
- charm (1)
- charm and bottom Produktion (1)
- charm and bottom production (1)
- chemical (1)
- chemical freezeout (1)
- chemisches Ausfrieren (1)
- chiral (1)
- chiral SU (3) (1)
- chiral SU(3) (1)
- chiral SU(3) model (1)
- chiral phase (1)
- cold baryon rich matter (1)
- cold dark matter (1)
- cold quark matter (1)
- collective flow (1)
- color current (1)
- coloured quark dynamic (1)
- conservation law (1)
- conservation laws (1)
- coupled-channel self-consistent calculation (1)
- dense (1)
- density perturbations (1)
- deuteron (1)
- dilepton (1)
- dileptons (1)
- directed flow (1)
- electron (1)
- elliptic flow analysis (1)
- energie (1)
- exotic matter (1)
- exotische Materie (1)
- femtoscopy data (1)
- finite temperature (1)
- flow (1)
- flow of nucleons (1)
- freezeout (1)
- gluon plasma (1)
- großer hadron collider (1)
- gyromagnetic moment (1)
- hadron hadron Kollision (1)
- hadron hadron collision (1)
- hadron interaction models (1)
- hadron matter (1)
- hadron yield (1)
- hadronic freeze-out (1)
- hadronic model (1)
- hard-core (1)
- heavy Hagedorn states (1)
- heavy ion (1)
- heavy-flavor quarks (1)
- heiße Kernmaterie (1)
- heiße Materie (1)
- heiße Pion Materie (1)
- heiße hadronic Materie (1)
- heiße und dichte Kernmaterie (1)
- heiße und dichte Materie (1)
- hidden charm production (1)
- high energie (1)
- high energy (1)
- high energy cosmic ray (1)
- high-energy nuclear collisions (1)
- hitze (1)
- hohe Energie (1)
- homogene Nukleation (1)
- hot (1)
- hot and dense matter (1)
- hot and dense nuclear matter (1)
- hot hadronic matter (1)
- hot hypernuclear matter (1)
- hot matter (1)
- hot pion matter (1)
- hybrid approach to air shower simulations (1)
- hydrodynamics (1)
- hypermatter (1)
- hyperonic Materie (1)
- hyperonic matter (1)
- ideal gas (1)
- ideales Gas (1)
- in-medium decay (1)
- in-medium properties (1)
- irreversibility state (1)
- kalte dunkle Materie (1)
- kaons (1)
- kinetisches Ausfrieren (1)
- kinetisches Modell (1)
- kollektive strom (1)
- kollidieren (1)
- lange hadron collider (1)
- large hadron collider (1)
- low energy hadronic model (1)
- many-body correlations (1)
- mass spectra (1)
- meson mass (1)
- microscopic transport theory (1)
- mikroskopische Transporttheorie (1)
- minimal length (1)
- minimale Länge (1)
- mixing of hadron sources (1)
- muon (1)
- neutralino (1)
- neutron and proton chemical potential (1)
- non-equilibrium dynamics (1)
- non-equilibrium quantum field dynamics (1)
- nuclear (1)
- nuclear shadowing (1)
- nuclear system (1)
- nucleus-nucleus collisions (1)
- offene charm Produktion (1)
- open and hidden charm (1)
- open and hidden charm production (1)
- open charm production (1)
- open charm yield (1)
- pQCD (1)
- particle distribution (1)
- particle number fluctuations (1)
- particle ratios (1)
- partonic (1)
- perturbative Quantum Chromodynamic (1)
- phase transition (1)
- photon (1)
- pion (1)
- pion gas (1)
- pions (1)
- production of pentaquark (1)
- quark antiquark (1)
- quark gluon Plasma (1)
- quark-meson coupling model (1)
- quarkonium (1)
- reich (1)
- relativistic fluid of quarks (1)
- relativistic heavy ion collider (1)
- relativistischer Schwerionen-Zusammenstoßer (1)
- rho meson (1)
- rich (1)
- scalar potential (1)
- schwarzes Loch (1)
- schwere Hagedorn Zustände (1)
- schwere Ione (1)
- schwere Ionen Kollision (1)
- schweres Ion (1)
- second cluster integral (1)
- space-momentum correlation (1)
- space-time (1)
- spectra (1)
- stabile kalte Kerne (1)
- stable cold nuclear matter (1)
- strange (1)
- strange quark star (1)
- strangeness (1)
- superheavy (1)
- superheavy nuclei (1)
- superschwer (1)
- superschwere Kerne (1)
- supersymmetric particle (1)
- symmetry potential (1)
- system (1)
- thermal (1)
- transport models (1)
- ultra-relativistic heavy ion collision (1)
- ultrarelativistic (1)
- ultrarelativistic energie (1)
- ultrarelativistic heavy ion collision (1)
- ultrarelativistic heavy-ion collision (1)
- ultrarelativistische Kollision des schweren Ionen (1)
- ultrarelativistische energie (1)
- ultrarelativistische schwere Ion Kollision (1)
- van der Waals (1)
- vector mesons (1)
- vector potential (1)
- zweite Gruppenintegral (1)
Institute
- Physik (221) (remove)
We present a RQMD calculation of antiproton yields and their momentum distribution in Ne + NaF collisions at 2 GeV/u. The antiprotons can be produced below threshold due to multi-step excitations for which meson-baryon interactions play a considerable role. In this system the annihilation probability for an initially produced antiproton is predicted to be about 65%.
We evaluate the in-medium D and -meson masses in hot hadronic matter induced by interactions with the light hadron sector described in a chiral SU(3) model. The e ective Lagrangian approach is generalized to SU(4) to include charmed mesons. We find that the D-mass drops substantially at finite temperatures and densities, which open the channels of the decay of the charmonium states ( 2, c, J/ ) to D pairs in the thermal medium. The e ects of vacuum polarisations from the baryon sector on the medium modification of the D-meson mass relative to those obtained in the mean field approximation are investigated. The results of the present work are compared to calculations based on the QCD sum-rule approach, the quark-meson coupling model, chiral perturbation theory, as well as to studies of quarkonium dissociation using heavy quark potential from lattice QCD.
Abstract: The e ect of vacuum fluctuations on the in-medium hadronic properties is investigated using a chiral SU(3) model in the nonlinear realization. The e ect of the baryon Dirac sea is seen to modify hadronic properties and in contrast to a calculation in mean field approximation it is seen to give rise to a significant drop of the vector meson masses in hot and dense matter. This e ect is taken into account through the summation of baryonic tadpole diagrams in the relativistic Hartree approximation (RHA), where the baryon self energy is modified due to interactions with both the non-strange ( ) and the strange ( ) scalar fields.
String theory suggests the existence of a minimum length scale. An exciting quantum mechanical implication of this feature is a modification of the uncertainty principle. In contrast to the conventional approach, this generalised uncertainty principle does not allow to resolve space time distances below the Planck length. In models with extra dimensions, which are also motivated by string theory, the Planck scale can be lowered to values accessible by ultra high energetic cosmic rays (UHECRs) and by future colliders, i.e. M f approximately equal to 1 TeV. It is demonstrated that in this novel scenario, short distance physics below 1/M f is completely cloaked by the uncertainty principle. Therefore, Planckian effects could be the final physics discovery at future colliders and in UHECRs. As an application, we predict the modifications to the e+ e- to f+ f- cross-sections.
We calculate open charm and charmonium production in Au + Au reac- tions at ps = 200 GeV within the hadron-string dynamics (HSD) transport approach employing open charm cross sections from pN and N reactions that are fitted to results from PYTHIA and scaled in magnitude to the available experimental data. Charmonium dissociation with nucleons and formed mesons to open charm (D + ¯D pairs) is included dynamically. The comover dissociation cross sections are described by a simple phase-space model including a single free parameter, i.e. an interaction strength M2 0 , that is fitted to the J/ suppression data for Pb + Pb collisions at SPS energies. As a novel feature we implement the backward channels for char- monium reproduction by D ¯D channels employing detailed balance. From our dynamical calculations we find that the charmonium recreation is com- parable to the dissociation by comoving mesons. This leads to the final result that the total J/ suppression at ps = 200 GeV as a function of centrality is slightly less than the suppression seen at SPS energies by the NA50 Collaboration, where the comover dissociation is substantial and the backward channels play no role. Furthermore, even in case that all di- rectly produced J/ mesons dissociate immediately (or are not formed as a mesonic state), a sizeable amount of charmonia is found asymptotically due to the D + ! J/ + meson channels in central collisions of Au + Au at ps = 200 GeV which, however, is lower than the J/ yield expected from f pp collis ns.
The D-meson spectral density at finite temperature is obtained within a self-consistent coupled-channel approach. For the bare meson-baryon interaction, a separable potential is taken, whose parameters are fixed by the position and width of the Lambda_c (2593) resonance. The quasiparticle peak stays close to the free D-meson mass, indicating a small change in the effective mass for finite density and temperature. However, the considerable width of the spectral density implies physics beyond the quasiparticle approach. Our results indicate that the medium modifications for the D-mesons in nucleus-nucleus collisions at FAIR (GSI) will be dominantly on the width and not, as previously expected, on the mass.
Abstract: 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 e ects from the baryonic Dirac sea on the K( ¯K ) masses are examined. The in-medium masses from the chiral SU(3) e ective model are compared to those from chiral perturbation theory. Furthermore, the influence of these in-medium e ects 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 v1 and the elliptic flow v2 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.
Dynamics of strange, charm and high momentum hadrons in relativistic nucleus nucleus collisions
(2003)
We investigate hadron production and attenuation of hadrons with strange and charm quarks (or antiquarks) as well as high transverse momentum hadrons in relativistic nucleus-nucleus col- lisions from 2 A·GeV to 21.3 A·TeV within two independent transport approaches (UrQMD and HSD). Both transport models are based on quark, diquark, string and hadronic degrees of freedom, but do not include any explicit phase transition to a quark-gluon plasma. From our dynamical calculations we find that both models do not describe the maximum in the K+/ + ratio at 20 - 30 A·GeV in central Au+Au collisions found experimentally, though the excitation functions of strange mesons are reproduced well in HSD and UrQMD. Furthermore, the transport calculations show that the charmonium recreation by D + J/ + meson reactions is comparable to the dissociation by comoving mesons at RHIC energies contrary to SPS energies. This leads to the final result that the total J/ suppression as a function of centrality at RHIC should be less than the suppression seen at SPS energies where the comover dissociation is substantial and the backward channels play no role. Furthermore, our transport calculations in comparison to exper- imental data on transverse momentum spectra from pp, d+Au and Au+Au reactions show that pre-hadronic e ects are responsible for both the hardening of the hadron spectra for low transverse momenta (Cronin e ect) as well as the suppression of high pT hadrons. The mutual interactions of formed hadrons are found to be negligible in central Au+Au collisions at s = 200 GeV for pT e 6 GeV/c and the sizeable suppression seen experimentally is attributed to a large extent to the interactions of leading pre-hadrons with the dense environment.
The influence of high and low energy hadronic models on lateral distribution functions of cosmic ray air showers for Auger energies is explored. A large variety of presently used high and low energy hadron interaction models are analysed and the resulting lateral distribution functions are compared. We show that the slope depends on both the high and low energy hadronic model used. The models are confronted with available hadron-nucleus data from accelerator experiments.