1,189 research outputs found
Quark motional effects on the interquark potential in baryons
We study the heavy-heavy-light quark () system in a non-relativistic
potential model, and investigate the quark motional effect on the
inter-two-quark potential in baryons. We adopt the Hamiltonian with the static
three-quark potential which is obtained by the first-principle calculation of
lattice QCD, rather than the two-body force in ordinary quark models. Using the
renormalization-group inspired variational method in discretized space, we
calculate the ground-state energy of systems and the light-quark spatial
distribution. We find that the effective string tension between the two heavy
quarks is reduced compared to the static three-quark case. This reduction of
the effective string tension originates from the geometrical difference between
the inter-quark distance and the flux-tube length, and is conjectured to be a
general property for baryons.Comment: 7 pages, 6 figure
Heavy-heavy-light quark potential in two approaches
We perform the first study about the heavy-heavy-light quark potential in
lattice QCD and a potential model. We find that the inter-two-quark confining
force is reduced by valence quark motional effects compared to the string
tension.Comment: Talk given at YITP International Symposium: Fundamental Problems in
Hot and/or Dense QCD, Kyoto, Japan, 3-6 March 200
Lattice QCD Analysis for Gluons
Nonperturbative properties of gluons are studied in SU(3) lattice QCD at the
quenched level. The first subject is a functional-form analysis of the gluon
propagator in the Landau gauge. We find that the gluon
propagator obtained in lattice QCD is well described by
the four-dimensional (4D) Yukawa-type function with MeV for the Euclidean 4D distance fm. In momentum space,
the gluon propagator ( GeV) is
found to be well approximated with a new-type propagator of ,
which corresponds to 4D Fourier image of the Yukawa-type function. Associated
with the Yukawa-type gluon propagator, we derive analytical expressions for the
zero-spatial-momentum propagator , the effective mass ,
and the spectral function of the gluon field. The mass parameter
turns out to be the infrared effective mass of gluons. The obtained gluon
spectral function is almost negative-definite for ,
except for a positive -functional peak at . The second
subject is a lattice-QCD determination of the relevant gluonic
momentum-component for color confinement. As a remarkable fact, the string
tension is found to be almost unchanged even after cutting off the
high-momentum gluon component above 1.5 GeV in the Landau gauge. In fact, the
relevant gluonic scale for color confinement is concluded to be below 1.5 GeV.Comment: Invited talk at International Workshop on QCD Green's Functions,
Confinement, and Phenomenology - QCD-TNT09, September 07 - 11 2009, ECT
Trento, Ital
Hydrogen and oxygen isotope ratios of thermal waters of Okayama Prefecture, Japan
Hydrogen and oxygen isotope rations of thermal waters from 46 spas in Okayama Prefecture range from -62.6 to -29.2% in δD and from -10.0 to -4.4% in δ18O, respectively. The isotope rations indicate that all but one of the thermal water in Okayama prefecture are meteoric in origin. The Ofuku thermal water is the only exception, which is probably a mixture of seawater and meteoric water with the ratio of about 1.
Sulfur isotope rations of dissolvel sulfate in the thermal waters range from -6.2 ti 59.3% in δ34S. The high δ34S values observed in some thermal waters may be due to bacterial reduction of sulfate
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