Journal article

Authors list: Larionov, A. B.; Mosel, U.; von Smekal, L.

Publication year: 2020

Journal: Physical Review C

Volume number: 102

Issue number: 6

ISSN: 2469-9985

eISSN: 2469-9993

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevC.102.064913

Publisher: American Physical Society

Abstract: 
We use the microscopic Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model to calculate dilepton (e(+)e(-)) production in heavy-ion collisions at SIS18 energies focusing on the effect of collisional broadening of the rho meson. The collisional width of the rho meson at finite temperature and baryon density in nuclear matter is calculated on the basis of the collision integral of the GiBUU model. A systematic comparison with HADES data on dilepton production in heavy-ion collisions is performed. The collisional broadening of the rho improves the agreement between theory and experiment for the dilepton invariant-mass distributions near the rho pole mass and for the excess radiation in Au+Au at 1.23A GeV. We furthermore show that some remaining underprediction of the experimental dilepton spectra in C+C at 1A GeV and Au+Au at 1.23A GeV at intermediate invariant masses 0.2-0.4 GeV can be accounted for by adjusting the pn bremsstrahlung cross section in a way to agree with the inclusive dilepton spectrum from dp collisions at 1.25A GeV.

Harvard Citation style: Larionov, A., Mosel, U. and von Smekal, L. (2020) Dilepton production in microscopic transport theory with an in-medium ρ-meson spectral function, Physical Review C, 102(6), Article 064913. https://doi.org/10.1103/PhysRevC.102.064913

APA Citation style: Larionov, A., Mosel, U., & von Smekal, L. (2020). Dilepton production in microscopic transport theory with an in-medium ρ-meson spectral function. Physical Review C. 102(6), Article 064913. https://doi.org/10.1103/PhysRevC.102.064913