Coalescence model for deuterons and antideuterons in relativistic heavy-ion collisions

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.1110· OSTI ID:7271112

Leupold, S; Heinz, U ^[1]

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1. Institut fuer Theoretische Physik, Universitaet Regensburg, Postfach 10 10 42, W-8400 Regensburg (Germany)

Existing formulations of the coalescence model for the formation of small nuclear clusters in nuclear collisions cannot distinguish between particle and antiparticle clusters and ignore the interactions of the cluster constituents with the other particles in the interaction region. Furthermore none of these models is kinematically fully consistent since the problem of energy conservation in the coalescence process is not dealt with directly, but buried in a phenomenological parameter, the coalescence radius.'' Studying the simplest case of (anti)deuteron formation, we include the effects on the coalescence rate from interactions with the medium, which allow for off-shell propagation and thus for energy conservation during coalescence, via effective medium-dependent masses for the cluster constituents. Instead of the conceptually ill-defined coalescence radius'' the width of the mass distributions is introduced as a fundamental parameter which, through the scattering rate in the medium, can be related to the temperature of the collision fireball. The freeze-out condition for the created clusters relates the thermodynamical parameters of the fireball to its geometric size at freeze-out and thus provides a deeper understanding of the role of the phenomenological coalescence radius'' in previous formulations. It automatically predicts different radius parameters and coalescence probabilities for deuterons and antideuterons. A detailed comparison of our new formulation with previous approaches is given.

• OSTI ID: 7271112
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:2; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

662340 -- Hadron Interactions-- (1992-)
663300* -- Nuclear Reactions & Scattering
General-- (1992-)
663450 -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTIDEUTERONS
ANTIMATTER
ANTINUCLEI
ANTIPARTICLES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
COALESCENCE
DEUTERONS
ELEMENTARY PARTICLES
ENERGY RANGE
FIREBALL MODEL
FRAGMENTATION
HEAVY ION REACTIONS
MATHEMATICAL MODELS
MATTER
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE MODELS
PARTICLE PRODUCTION
RELATIVISTIC RANGE