Dilepton production in heavy ion collisions

Wolf, G.; Batko, G.; Cassing, W.; Mosel, U.; Niita, K.; Schaefer, M.

doi:10.1016/0375-9474(90)90222-8

Dilepton production in heavy ion collisions

1990

24 pages

Published in:

Nucl.Phys.A 517 (1990) 615-638

Published: 1990

DOI:

10.1016/0375-9474(90)90222-8

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Abstract: (Elsevier)

The dynamical evolution of nucleus-nucleus collisions is described by a transport equation of the Uehling-Uhlenbeck type. Our model evolves phase-space distribution functions for nucleons, Δ's, N ∗ (1440)-resonances and pions with their isospin degrees of freedom. The equations are solved by the test-particle simulation method. We apply this model to proton-nucleus and nucleus-nucleus collisions from 400 MeV/ A to 2.1 GeV/ A . Our approach is found to correctly describe the spectra of baryons and pions. Furthermore, we calculate the production of dileptons considering proton-neutron and pion bremsstrahlung, Δ and N ∗ decay and π + π − annihilation. The calculations reproduce the data for p+ 9 Be and for 40 Ca + 40 Ca at the bombarding energies of 1 GeV/ A and 2 GeV/ A except for small invariant masses ( M ⩽ 200 MeV) where the situation is not fully understood. Above 300 MeV dilepton invariant mass the relevant contributions arise from proton-neutron bremsstrahlung, the Δ Dalitz-decay and π + π − annihilation. At 2 GeV/ A for 40 Ca + 40 Ca, however, we find the bremsstrahlung contribution to be higher than that from pion annihilation.

p nucleus: nuclear reaction
nucleus nucleus: nuclear reaction
beryllium
calcium
differential equations
mean field approximation
Delta(1232)
N(1440)
p: hadroproduction
hadroproduction: p

References(39)

Figures(0)

[1]

Production of energetic particles in heavy ion collisions

- Phys.Rept. 188 (1990) 363-449
•
DOI:
- 10.1016/0370-1573(90)90164-W

[2]

Pion Fields in Nuclear Matter

Arkady B. Migdal
(
- Landau Inst.
)

- Rev.Mod.Phys. 50 (1978) 107-172
•
DOI:
- 10.1103/RevModPhys.50.107

[3]

Pion Collectivity in Relativistic Heavy Ion Collisions

- Nucl.Phys.A 490 (1988) 745-755
•
DOI:
- 10.1016/0375-9474(88)90024-3

[4]

Pions and nuclei

T. Ericson
,
W. Weise

[5]

Dilepton radiation from high temperature nuclear matter

Charles Gale
(
- Minnesota U.
)
,
Joseph I. Kapusta
(
- Minnesota U.
)

- Phys.Rev.C 35 (1987) 2107-2116
•
DOI:
- 10.1103/PhysRevC.35.2107

[5]

Dilepton Radiation From Nucleon-nucleon Collisions

Charles Gale
(
- Chalk River, AECL
)
,
Joseph I. Kapusta
(
- Minnesota U.
)

- Phys.Rev.C 40 (1989) 2397-2399
•
DOI:
- 10.1103/PhysRevC.40.2397

[6]

Dilepton as a Probe of Pion Dynamics in Heavy Ion Collisions

- Nucl.Phys.A 485 (1988) 721-732
•
DOI:
- 10.1016/0375-9474(88)90563-5

[6]

Effect of the Imaginary Part of the Pion Selfenergy on Dilepton Production in Dense Nuclear Matter

- Phys.Lett.B 231 (1989) 16-20
•
DOI:
- 10.1016/0370-2693(89)90104-4

[7]

G. Batko
,
T.S. Biro
,
W. Cassing
,
U. Mosel
,
M. Schäfer

et al.

[8]

Dielectron production from nucleus-nucleus collisions

- Nucl.Phys.A 512 (1990) 772-786
•
DOI:
- 10.1016/0375-9474(90)90234-D

[9]

Equilibration in relativistic nuclear collisions. A Monte Carlo calculation

- Nucl.Phys.A 352 (1981) 505-534
•
DOI:
- 10.1016/0375-9474(81)90427-9

[10]

A Guide to microscopic models for intermediate-energy heavy ion collisions

G.F. Bertsch
(
- Michigan State U.
)
,
S. Das Gupta
(
- McGill U.
)

- Phys.Rept. 160 (1988) 189-233
•
DOI:
- 10.1016/0370-1573(88)90170-6

[11]

W. Cassing
,
K. Niita
,
S.J. Wang

- Z.Phys.A 331 (1988) 439

[12]

Causality and relativistic effects in intranuclear cascade calculations

T. Kodama
(
- Rio de Janeiro, CBPF and
- Rio de Janeiro Federal U.
)
,
S.B. Duarte
(
- Rio de Janeiro, CBPF and
- Rio de Janeiro Federal U.
)
,
K.C. Chung
(
- Rio de Janeiro, CBPF and
- Rio de Janeiro Federal U.
)
,
R. Donangelo
(
- Rio de Janeiro, CBPF and
- Rio de Janeiro Federal U.
)
,
R.A.M.S. Nazareth
(
- Rio de Janeiro, CBPF and
- Rio de Janeiro Federal U.
)

- Phys.Rev.C 29 (1984) 2146-2152,
- Rio De Janeiro Pesquisas Fis. - NF-83-026 (83,REC.AUG.) 24p
•
DOI:
- 10.1103/PhysRevC.29.2146

[13]

Hard-photon production within a self-consistent transport approach to heavy-ion collisions

- Nucl.Phys.A 504 (1989) 391-412
•
DOI:
- 10.1016/0375-9474(89)90353-9

[14]

Hartree-Fock calculations with Skyrme's interaction. 1. Spherical nuclei

D. Vautherin
(
- MIT, LNS
)
,
D.M. Brink
(
- Oxford U.
)

- Phys.Rev.C 5 (1972) 626-647
•
DOI:
- 10.1103/PhysRevC.5.626

[15]

Measurement of the $p p$ Cross-sections in the Momentum Range 0.9-2.0 GeV/c

et al.

- Nucl.Phys.A 386 (1982) 571-588
•
DOI:
- 10.1016/0375-9474(82)90037-9

[16]

Study of $p p$ Interactions in the Momentum Range 0.9-{GeV}/ $c$ to 2.0-{GeV}/ $c$

et al.

- Nucl.Phys.A 389 (1982) 445-456
•
DOI:
- 10.1016/0375-9474(82)90424-9

[17]

N N SINGLE PION PRODUCTION CROSS-SECTIONS BELOW 1500-MeV

B.J. VerWest
(
- Texas A-M
)
,
R.A. Arndt
(
- Virginia Tech.
)

- Phys.Rev.C 25 (1982) 1979,
- Phys. Rev. C25 ( 1982) 1979-1985 and Texas A & M Univ. College Station - DOE-ER-05223-43 (REC.NOV.81) 25 P. (114686)
•
DOI:
- 10.1103/PhysRevC.25.1979

[18]

NUCLEAR PHOTOABSORPTION AND COMPTON SCATTERING AT INTERMEDIATE-ENERGY

- Annals Phys. 154 (1984) 99-160,
- Mit Cambridge - CTP-1088 (83,REC.SEP.) 91p,
- Ann. Phys. ( N.y.) 154 ( 1984) 99-160 and Mit Cambridge - CTP-1088 (83,REC.SEP.) 91p
•
DOI:
- 10.1016/0003-4916(84)90141-6

[19]

Phys.Lett.,B204

[20]

HIGH-ENERGY NUCLEAR COLLISIONS

S. Nagamiya
(
- LBL, Berkeley
)
,
M. Gyulassy
(
- LBL, Berkeley
)

- Adv.Nucl.Phys. 13 (1984) 201-315,
- Lawrence Berkeley Lab. - LBL-14035 (82,REC.JUN.) 173p,
- In *Negele, J.w. ( Ed.), Vogt, E. ( Ed.): Advances In Nuclear Physics, Vol. 13*, 201-315 and Lawrence Berkeley Lab. - LBL-14035 (82,REC.JUN.) 173p

[21]

Comparison of Nuclear Transport Models With 800-a-{MeV} La + La Data

et al.

- Phys.Rev.Lett. 62 (1989) 1461-1464
•
DOI:
- 10.1103/PhysRevLett.62.1461

[22]

NEW CASCADE MODEL CALCULATION OF PION MULTIPLICITY IN HIGH-ENERGY HEAVY ION COLLISIONS

et al.

- Phys.Lett.B 138 (1984) 341-344,
- Lawrence Berkeley Lab. - LBL-16278 (83,REC.OCT.) 13p,
- Phys. Lett. B138 (1984) 341-344 and Lawrence Berkeley Lab. - LBL-16278 (83,REC.OCT.) 13p
•
DOI:
- 10.1016/0370-2693(84)91912-9

[23]

Particle Production in High-Energy Nucleus Nucleus Collisions

R. Stock
(
- Darmstadt, GSI
)

- Phys.Rept. 135 (1986) 259-315
•
DOI:
- 10.1016/0370-1573(86)90134-1

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