K. Gallmeister | Goethe-Universität Frankfurt am Main (original) (raw)
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Petersburg Nuclear Physics Institute
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Papers by K. Gallmeister
Using QCD-inspired time dependent cross sections for pre-hadrons we provide a combined analysis o... more Using QCD-inspired time dependent cross sections for pre-hadrons we provide a combined analysis of available experimental data on hadron attenuation in DIS off nuclei as measured by HERMES with 12 and 27 GeV and by EMC with 100 and 280 GeV lepton beam energies. We extract the complete four-dimensional evolution of the pre-hadrons using the Jetset-part of Pythia. We find a remarkable sensitivity of nuclear attenuation data to the details of the time-evolution of cross sections. Only cross sections evolving linearly in time describe the available data in a wide kinematical regime. Predictions for experimental conditions at JLAB/CLAS (5 and 12 GeV beam energies) are included.
Physical Review C, 2007
Aiming at a microscopic description of heavy ion collisions in the beam energy region of about 10... more Aiming at a microscopic description of heavy ion collisions in the beam energy region of about 10 A GeV, we extend the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model by including a relativistic mean field, in-medium baryon-baryon cross sections and three-body collisions.
Physical Review C, 2012
Background: The total inclusive cross sections obtained for quasielastic (QE) scattering in the M... more Background: The total inclusive cross sections obtained for quasielastic (QE) scattering in the MiniBooNE experiment are significantly larger than those calculated by all models based on the impulse approximation and using the world average value for the axial mass of MA ≈ 1 GeV. This discrepancy has led to various quite different explanations in terms of increased axial masses, changes in the functional form of the axial form factor, increased vector strength in nuclei, and initial 2-particle interactions. This is disconcerting since the neutrino energy reconstruction depends on the reaction mechanism.
Physical Review C, 2012
Background: Nuclear effects can have a significant impact on neutrino-nucleus interactions. In pa... more Background: Nuclear effects can have a significant impact on neutrino-nucleus interactions. In particular, data from neutrino experiments with broad energy distributions require complex theoretical models that are able to take all the relevant channels into account as well as incorporate nuclear effects in both initial and final-state interactions.
Physical Review C, 2011
Ongoing experiments at JLAB investigate the nuclear transparency in exclusive ρ 0 (770) electropr... more Ongoing experiments at JLAB investigate the nuclear transparency in exclusive ρ 0 (770) electroproduction off nuclei. In this work we present transport model predictions for the attenuation of ρ 0 s in nuclei and for color transparency (CT) effects as observable at CLAS with a 5 GeV electron beam energy. A full event simulation presented here permits to study the impact of actual experimental acceptance conditions and kinematical cuts. The exclusive (e, e ′ ρ 0 ) cross section off nucleons is described by diffractive and color string breaking mechanisms extended toward the onset of the deep inelastic regime. Different hadronization and CT scenarios are compared. We show that a detailed analysis of elementary cross section, nuclear effects and experimental cuts is needed to reveal the early onset of ρ-CT at present JLAB energies.
Nuclear Physics A, 2009
We compare calculations for the production of charged pions by pion or proton beams off nuclei ca... more We compare calculations for the production of charged pions by pion or proton beams off nuclei calculated within our coupled channel transport model (GiBUU) with recent data of the HARP collaboration for beam energies from 3 up to 13 GeV. Predictions for the 30 GeV data for pions and kaons from the NA61/SHINE experiment are included.
We investigate meson electroproduction off complex nuclei in the kinematic regime of the HERMES e... more We investigate meson electroproduction off complex nuclei in the kinematic regime of the HERMES experiment using a semi-classical transport model which is based on the Boltzmann-Uehling-Uhlenbeck (BUU) equation. We discuss coherence length and color transparency effects in exclusive ρ 0 production as well as hadron formation and attenuation of charged pions, kaons, protons and anti-protons in deep inelastic lepton scattering off nuclei.
![Research paper thumbnail of Publishers’s Note: Incoherent ρ^{0} electroproduction off nuclei [Phys. Rev. C 67, 054606 (2003)]](https://attachments.academia-assets.com/43656039/thumbnails/1.jpg)
](In the present paper we investigate incoherent ρ 0 electroproduction off complex nuclei. We deriv... more In the present paper we investigate incoherent ρ 0 electroproduction off complex nuclei. We derive a novel, simple expression for the incoherent electroproduction cross section in which one can clearly separate the final state interactions of the reaction products from the 'initial state interactions' of the photon that give rise to nuclear shadowing. In the special case of purely absorptive final state interactions we deduce from our expression the known Glauber result. A more realistic treatment of the final state interactions within a transport model is then used to compare our predictions with experimental data from the HERMES experiment.
Using QCD-inspired time dependent cross sections for pre-hadrons we provide a combined analysis o... more Using QCD-inspired time dependent cross sections for pre-hadrons we provide a combined analysis of available experimental data on hadron attenuation in DIS off nuclei as measured by HERMES with 12 and 27 GeV and by EMC with 100 and 280 GeV lepton beam energies. We extract the complete four-dimensional evolution of the pre-hadrons using the Jetset-part of Pythia. We find a remarkable sensitivity of nuclear attenuation data to the details of the time-evolution of cross sections. Only cross sections evolving linearly in time describe the available data in a wide kinematical regime. Predictions for experimental conditions at JLAB/CLAS (5 and 12 GeV beam energies) are included.
Physical Review C, 2007
Aiming at a microscopic description of heavy ion collisions in the beam energy region of about 10... more Aiming at a microscopic description of heavy ion collisions in the beam energy region of about 10 A GeV, we extend the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model by including a relativistic mean field, in-medium baryon-baryon cross sections and three-body collisions.
Physical Review C, 2012
Background: The total inclusive cross sections obtained for quasielastic (QE) scattering in the M... more Background: The total inclusive cross sections obtained for quasielastic (QE) scattering in the MiniBooNE experiment are significantly larger than those calculated by all models based on the impulse approximation and using the world average value for the axial mass of MA ≈ 1 GeV. This discrepancy has led to various quite different explanations in terms of increased axial masses, changes in the functional form of the axial form factor, increased vector strength in nuclei, and initial 2-particle interactions. This is disconcerting since the neutrino energy reconstruction depends on the reaction mechanism.
Physical Review C, 2012
Background: Nuclear effects can have a significant impact on neutrino-nucleus interactions. In pa... more Background: Nuclear effects can have a significant impact on neutrino-nucleus interactions. In particular, data from neutrino experiments with broad energy distributions require complex theoretical models that are able to take all the relevant channels into account as well as incorporate nuclear effects in both initial and final-state interactions.
Physical Review C, 2011
Ongoing experiments at JLAB investigate the nuclear transparency in exclusive ρ 0 (770) electropr... more Ongoing experiments at JLAB investigate the nuclear transparency in exclusive ρ 0 (770) electroproduction off nuclei. In this work we present transport model predictions for the attenuation of ρ 0 s in nuclei and for color transparency (CT) effects as observable at CLAS with a 5 GeV electron beam energy. A full event simulation presented here permits to study the impact of actual experimental acceptance conditions and kinematical cuts. The exclusive (e, e ′ ρ 0 ) cross section off nucleons is described by diffractive and color string breaking mechanisms extended toward the onset of the deep inelastic regime. Different hadronization and CT scenarios are compared. We show that a detailed analysis of elementary cross section, nuclear effects and experimental cuts is needed to reveal the early onset of ρ-CT at present JLAB energies.
Nuclear Physics A, 2009
We compare calculations for the production of charged pions by pion or proton beams off nuclei ca... more We compare calculations for the production of charged pions by pion or proton beams off nuclei calculated within our coupled channel transport model (GiBUU) with recent data of the HARP collaboration for beam energies from 3 up to 13 GeV. Predictions for the 30 GeV data for pions and kaons from the NA61/SHINE experiment are included.
We investigate meson electroproduction off complex nuclei in the kinematic regime of the HERMES e... more We investigate meson electroproduction off complex nuclei in the kinematic regime of the HERMES experiment using a semi-classical transport model which is based on the Boltzmann-Uehling-Uhlenbeck (BUU) equation. We discuss coherence length and color transparency effects in exclusive ρ 0 production as well as hadron formation and attenuation of charged pions, kaons, protons and anti-protons in deep inelastic lepton scattering off nuclei.
In the present paper we investigate incoherent ρ 0 electroproduction off complex nuclei. We deriv... more In the present paper we investigate incoherent ρ 0 electroproduction off complex nuclei. We derive a novel, simple expression for the incoherent electroproduction cross section in which one can clearly separate the final state interactions of the reaction products from the 'initial state interactions' of the photon that give rise to nuclear shadowing. In the special case of purely absorptive final state interactions we deduce from our expression the known Glauber result. A more realistic treatment of the final state interactions within a transport model is then used to compare our predictions with experimental data from the HERMES experiment.