Rho meson in dense hadronic matter

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.R1159· OSTI ID:7001741

Asakawa, M; Ko, C M; Levai, P; Qiu, X J ^[1]

---

1. Cyclotron Institute and Physics Department, Texas A M University, College Station, Texas 77843 (United States)

The spectral function of a rho meson that is at rest in dense hadronic matter and couples strongly to the pion is studied in the vector dominance model by including the effect of the delta-hole polarization of the pion. With the free rho-meson mass in the Lagrangian, we find that both the rho-meson peak and width increase with increasing nuclear density, and that a low-mass peak appears at invariant mass around three times the pion mass. Including the decreasing density-dependent hadron masses in the Lagrangian as suggested by the scaling law of Brown and Rho, we find instead that the rho peak moves to smaller invariant masses with diminishing strength when the nuclear density increases. The low-mass peak also shifts down with increasing density and becomes more pronounced. The relevance of the rho-meson property in dense matter to delepton production in heavy-ion collisions is discussed.

• OSTI ID: 7001741
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

662420* -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
ELEMENTARY PARTICLES
FUNCTIONS
HADRONS
MATHEMATICAL MODELS
MATTER
MESONS
NUCLEAR MATTER
PARTICLE MODELS
RHO-770 MESONS
SCALING LAWS
SPECTRAL FUNCTIONS
VECTOR DOMINANCE MODEL
VECTOR MESONS