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- K. Shekhter, Amand Faessler, C. Fuchs, M. Krivoruchenko, B. Martemyanov
- 2002

During the last decade, the problem of the description of hadrons in dense and hot nuclear matter received great attention. The purpose of the current investigations is to determine experimentally mass shifts and the broadening of hadronic resonances at finite density and temperature. The dilepton spectra from heavy-ion collisions are a suitable tool for… (More)

- T. Klähn, D. Blaschke, S. Typel, E. N. E. van Dalen, A. Faessler, C. Fuchs +10 others
- 2006

A new scheme for testing nuclear matter equations of state (EoSs) at high densities using constraints from neutron star (NS) phenomenology and a flow data analysis of heavy-ion collisions is suggested. An acceptable EoS shall not allow the direct Urca process to occur in NSs with masses below 1.5M , and also shall not contradict flow and kaon production… (More)

- F. Giacosa, Amand Faessler
- 2005

We study the strong and electromagnetic decay properties of scalar mesons above 1 GeV within a chiral approach. The scalar-isoscalar states are treated as mixed states of quarkonia and glueball configurations. A fit to the experimental decay rates listed by the Particle Data group is performed to extract phenomenological constraints on the nature of the… (More)

- Amand Faessler
- 2008

We calculate the electromagnetic moments and radii of the ∆(1232) in the nonrel-ativistic quark model, including two-body exchange currents. We show that two-body exchange currents lead to nonvanishing ∆ and N → ∆ transition quadrupole moments even if the wave functions have no D-state admixture. The usual explanation based on the single-quark transition… (More)

- Fedor Šimkovic, Amand Faessler, Vadim Rodin, Petr Vogel, Jonathan Engel
- 2008

We show that, within the quasiparticle random phase approximation (QRPA) and the renormalized QRPA (RQRPA) based on the Bonn-CD nucleon-nucleon interaction, the competition between the pairing and the neutron-proton particle-particle and particle-hole interactions causes contributions to the neutrinoless double-beta decay matrix element to nearly vanish at… (More)

- Antoni Szczurek, Alfons J. Buchmann, Amand Faessler
- 2008

We discuss the dressing of constituent quarks with a pseudoscalar meson cloud within the effective chiral quark model. SU (3) f symmetry breaking effects are included explicitly. Our results are compared with those of the traditional meson cloud approach in which pions are coupled to the nucleon. The pionic dressing of the constituent quarks explains the… (More)

- A. Faessler
- 2008

Estimates of nuclear matrix elements for neutrinoless double beta decay (0ν2β) based on the quasiparticle random phase approximations (QRPA) are affected by theoretical uncertainties, which can be substantially reduced by fixing the unknown strength parameter g pp of the residual particle-particle interaction through one experimental constraint — most… (More)

- V E Lyubovitskij, P Wang, Th Gutsche, Amand Faessler
- 2002

We apply the perturbative chiral quark model at one loop to calculate the strange form factors of the nucleon. A detailed numerical analysis of the strange magnetic moments and radii of the nucleon, and also the momentum dependence of the form factors is presented.

- S Cheedket, V E Lyubovitskij, Th Gutsche, Amand Faessler, K Pumsa-Ard, Y Yan
- 2002

We apply the perturbative chiral quark model at one loop to analyze the electromagnetic form factors of the baryon octet. The analytic expressions for baryon form factors, which are given in terms of fundamental parameters of low-energy pion-nucleon physics(weak pion decay constant, axial nucleon coupling, strong pion-nucleon form factor), and the numerical… (More)

- Amand Faessler
- 2001

We study the semileptonic decays of the lowest lying double heavy baryons using the relativistic three-quark model. We do not employ a heavy quark mass expansion but keep the masses of the heavy quarks and baryons finite. We calculate all relevant form factors and decay rates. The semileptonic decays of heavy mesons and baryons are ideally suited to extract… (More)