Scalarquark systems and chimera hadrons in SU(3){sub c} lattice QCD
Abstract
In terms of mass generation in the strong interaction without chiral symmetry breaking, we perform the first study for light scalarquarks {phi} (colored scalar particles with 3{sub c} or idealized diquarks) and their colorsinglet hadronic states using quenched SU(3){sub c} lattice QCD with {beta}=5.70 (i.e., a{approx_equal}0.18 fm) and lattice size 16{sup 3}x32. We investigate ''scalarquark mesons'' {phi}{sup {dagger}}{phi} and ''scalarquark baryons'' {phi}{phi}{phi} as the bound states of scalarquarks {phi}. We also investigate the colorsinglet bound states of scalarquarks {phi} and quarks {psi}, i.e., {phi}{sup {dagger}}{psi}, {psi}{psi}{phi}, and {phi}{phi}{psi}, which we name ''chimera hadrons.'' All the newtype hadrons including {phi} are found to have a large mass even for zero bare scalarquark mass m{sub {phi}}=0 at a{sup 1}{approx_equal}1 GeV. We find a ''constituent scalarquark/quark picture'' for both scalarquark hadrons and chimera hadrons. Namely, the mass of the newtype hadron composed of m {phi}'s and n {psi}'s, M{sub m{phi}}{sub +n{psi}}, approximately satisfies M{sub m{phi}}{sub +n{psi}}{approx_equal}mM{sub {phi}}+nM{sub {psi}}, where M{sub {phi}} and M{sub {psi}} are the constituent scalarquark and quark masses, respectively. We estimate the constituent scalarquark mass M{sub {phi}} for m{sub {phi}}=0 at a{sup 1}{approx_equal}1 GeV as M{sub {phi}}{approx_equal}1.51.6 GeV, which is much larger than the constituent quark mass M{sub {psi}}{approx_equal}400 MeVmore »
 Authors:
 Yukawa Institute for Theoretical Physics, Kyoto University, Sakyo, Kyoto 6068502 (Japan)
 Department of Physics, Kyoto University, Graduate School of Science, Sakyo, Kyoto 6068502 (Japan)
 Publication Date:
 OSTI Identifier:
 20929560
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.75.114503; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BOUND STATE; CHIRAL SYMMETRY; CHIRALITY; COLOR MODEL; EFFECTIVE MASS; GEV RANGE 0110; GLUEBALLS; GLUONS; LATTICE FIELD THEORY; MEV RANGE 1001000; PHI MESONS; QUANTUM CHROMODYNAMICS; QUARKS; STRONG INTERACTIONS; SU3 GROUPS; SYMMETRY BREAKING
Citation Formats
Iida, H., Takahashi, T. T., and Suganuma, H. Scalarquark systems and chimera hadrons in SU(3){sub c} lattice QCD. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVD.75.114503.
Iida, H., Takahashi, T. T., & Suganuma, H. Scalarquark systems and chimera hadrons in SU(3){sub c} lattice QCD. United States. doi:10.1103/PHYSREVD.75.114503.
Iida, H., Takahashi, T. T., and Suganuma, H. Fri .
"Scalarquark systems and chimera hadrons in SU(3){sub c} lattice QCD". United States.
doi:10.1103/PHYSREVD.75.114503.
@article{osti_20929560,
title = {Scalarquark systems and chimera hadrons in SU(3){sub c} lattice QCD},
author = {Iida, H. and Takahashi, T. T. and Suganuma, H.},
abstractNote = {In terms of mass generation in the strong interaction without chiral symmetry breaking, we perform the first study for light scalarquarks {phi} (colored scalar particles with 3{sub c} or idealized diquarks) and their colorsinglet hadronic states using quenched SU(3){sub c} lattice QCD with {beta}=5.70 (i.e., a{approx_equal}0.18 fm) and lattice size 16{sup 3}x32. We investigate ''scalarquark mesons'' {phi}{sup {dagger}}{phi} and ''scalarquark baryons'' {phi}{phi}{phi} as the bound states of scalarquarks {phi}. We also investigate the colorsinglet bound states of scalarquarks {phi} and quarks {psi}, i.e., {phi}{sup {dagger}}{psi}, {psi}{psi}{phi}, and {phi}{phi}{psi}, which we name ''chimera hadrons.'' All the newtype hadrons including {phi} are found to have a large mass even for zero bare scalarquark mass m{sub {phi}}=0 at a{sup 1}{approx_equal}1 GeV. We find a ''constituent scalarquark/quark picture'' for both scalarquark hadrons and chimera hadrons. Namely, the mass of the newtype hadron composed of m {phi}'s and n {psi}'s, M{sub m{phi}}{sub +n{psi}}, approximately satisfies M{sub m{phi}}{sub +n{psi}}{approx_equal}mM{sub {phi}}+nM{sub {psi}}, where M{sub {phi}} and M{sub {psi}} are the constituent scalarquark and quark masses, respectively. We estimate the constituent scalarquark mass M{sub {phi}} for m{sub {phi}}=0 at a{sup 1}{approx_equal}1 GeV as M{sub {phi}}{approx_equal}1.51.6 GeV, which is much larger than the constituent quark mass M{sub {psi}}{approx_equal}400 MeV in the chiral limit. Thus, scalar quarks acquire a large mass due to large quantum corrections by gluons in the systems including scalar quarks. Together with other evidences of mass generation of glueballs and charmonia, we conjecture that all colored particles generally acquire a large effective mass due to dressed gluon effects. In addition, the large mass generation of pointlike colored scalar particles indicates that plausible diquarks used in effective hadron models cannot be described as the pointlike particles and should have a much larger size than a{approx_equal}0.2 fm.},
doi = {10.1103/PHYSREVD.75.114503},
journal = {Physical Review. D, Particles Fields},
number = 11,
volume = 75,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}

Light scalarquarks {phi} (colored scalar particles or idealized diquarks) and their colorsinglet hadronic states are studied with quenched SU(3)c lattice QCD in terms of mass generation. We investigate 'scalarquark mesons' {phi}{dagger}{phi} and 'scalarquark baryons' {phi}{phi}{phi} as the bound states of scalarquarks {phi}. We also investigate the bound states of scalarquarks {phi} and quarks {psi}, i.e., {phi}{dagger}{psi}, {psi}{psi}{phi} and {phi}{phi}{psi}, which we name 'chimera hadrons'. All the newtype hadrons including {phi} are found to have a large mass due to large quantum corrections by gluons, even for zero bare scalarquark mass m{phi} = 0 at a1 {approx} 1GeV. We conjecture thatmore »

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