Effects of spatial size, lattice doubling, and source operators on the hadron spectrum with dynamical staggered quarks at 6/[ital g][sup 2]=5. 6

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.6026· OSTI ID:7308496

Bitar, K M; Edwards, R; Heller, U M; Kennedy, A D ^[1]; Gottlieb, S ^[2]; Kogut, J B ^[3]; Krasnitz, A ^[4]; Liu, W ^[5]; Ogilvie, M C ^[6]; Renken, R L ^[7]; Sinclair, D K ^[8]; Sugar, R L ^[9]

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1. Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306-4052 (United States)
2. Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)
3. Physics Department, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801 (United States)
4. IPS, RZ F 3, Eidgenoessische Technische Hochschule-Zentrum, CH-8092 Zurich (Switzerland)
5. Thinking Machines Corporation, Cambridge, Massachusetts 02139 (United States)
6. Department of Physics, Washington University, St. Louis, Missouri 63130 (United States)
7. Physics Department, University of Central Florida, Orlando, Florida 32816 (United States)
8. High Energy Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
9. Department of Physics, Universi

We have extended our previous study of the lattice QCD spectrum with two flavors of staggered dynamical quarks at 6/[ital g][sup 2]=5.6 and [ital am][sub [ital q]]=0.025 and 0.01 to larger lattices, with better statistics and with additional sources for the propagators. The additional sources allowed us to estimate the [Delta] mass and to measure the masses of all mesons whose operators are local in time. These mesons show good evidence for flavor symmetry restoration, except for the masses of the Goldstone and non-Goldstone pions. PCAC is observed in that [ital m][sub [pi]][sup 2][proportional to][ital m][sub [ital q]], and [ital f][sub [pi]] is estimated. Use of undoubled lattices removes the problems with the pion propagator found in our earlier work. Previously we found a large change in the nucleon mass at a quark mass of [ital am][sub [ital q]]=0.01 when we increased the spatial size from 12 to 16. No such effect is observed at the larger quark mass, [ital am][sub [ital q]]=0.025. Two kinds of wall source were used, and we have found difficulties in getting consistent results for the nucleon mass between the two sources.

• DOE Contract Number: FG05-92ER40742; FG02-85ER40213; AC02-86ER40253; AC02-84ER40125
• OSTI ID: 7308496
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 49:11; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110 -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662230* -- Quantum Chromodynamics-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
DELTA BARYONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FLAVOR
GOLDSTONE BOSONS
HADRONS
LATTICE FIELD THEORY
MASS
MESONS
N BARYONS
ORGANOLEPTIC PROPERTIES
PCAC THEORY
POSTULATED PARTICLES
PROPAGATOR
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SIZE
SPECTRA
SYMMETRY