Quenched QCD at finite density

Journal Article · Wed Feb 01 00:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.1282· OSTI ID:6639244

Kogut, J B; Lombardo, M ^[1]; Sinclair, D K ^[2]

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1. Physics Department, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080 (United States)
2. High Energy Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)

Simulations of quenched QCD at a relatively small but [ital nonzero] chemical potential [mu] on 32[times]16[sup 3] lattices indicate that the nucleon screening mass decreases linearly as [mu] increases predicting a critical chemical potential of one-third the nucleon mass, [ital m][sub [ital N]]/3, by extrapolation. The meson spectrum does not change as [mu] increases over the same range, from zero to [ital m][sub [pi]]/2. Past studies of quenched lattice QCD have suggested that there is phase transition at [mu]=[ital m][sub [pi]]/2. We discuss a number of technical reasons why standard lattice simulation techniques suffer from greatly enhanced fluctuations and finite size effects for [mu] ranging from [ital m][sub [pi]]/2 to [ital m][sub [ital N]]/3. We find evidence for such problems in our simulations, and suggest that they can be surmounted by improved measurement techniques, which should enable us to extend our calculations to the interesting domain [ital m][sub [pi]]/2[lt][mu][lt][ital m][sub [ital N]]/3.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6639244
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 51:3; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM CHROMODYNAMICS
SIMULATION
DENSITY
MASS
MASS SPECTRA
MESONS
NUCLEONS
PHASE TRANSFORMATIONS
QUENCHING
SCREENING
BARYONS
BOSONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
PHYSICAL PROPERTIES
QUANTUM FIELD THEORY
SPECTRA
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