Intermediate-mass dilepton spectra and the role of secondary hadronic processes in heavy-ion collisions

Journal Article · Sun Nov 01 04:00:00 EST 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.58.2914· OSTI ID:663761

Li, G Q ^[1]; Gale, C ^[2]

---

1. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)
2. Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8 (CANADA)

We carry out a study of intermediate-mass (between 1 and 2.5 GeV) dilepton spectra from hadronic interactions in heavy-ion collisions. The processes considered are {pi}{pi}{r_arrow}l{bar l}, {pi}{rho}{r_arrow}l{bar l}, {pi}a{sub 1}{r_arrow}l{bar l}, {pi}{omega}{r_arrow}l{bar l}, K{bar K}{r_arrow}l{bar l}, and K{bar K}{sup {asterisk}}+c.c.{r_arrow}l{bar l}. The elementary cross sections for those are obtained from chiral Lagrangians involving pseudoscalar, vector, and axial-vector mesons. The respective electromagnetic form factors are determined by fitting to experimental data for the reverse processes of e{sup +}e{sup {minus}}{r_arrow} hadrons. Based on this input we calculate cross sections and thermal dilepton emission rates and compare our results with those from other approaches. Finally we use these elementary cross sections with a relativistic transport model and calculate dilepton spectra in S+W collisions at SPS energies. The comparison of our results with experimental data from the HELIOS-3 Collaboration indicates the importance of the secondary hadronic contributions to the intermediate-mass dilepton spectra. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 663761
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 58; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHIRAL SYMMETRY
CROSS SECTIONS
ELECTROMAGNETIC FORM FACTORS
ELECTRON-ELECTRON COLLISIONS
ELECTRON-ELECTRON INTERACTIONS
HADRON REACTIONS
HEAVY ION REACTIONS
KAON REACTIONS
MESON REACTIONS
PION REACTIONS