13,174 research outputs found
Quarkonium in Heavy Ion Collisions -- high-energy multiple scattering of quark pair in nuclei
Quarkonium suppression in heavy ion collisions is a potential signature of
the formation of the quark-gluon plasma. After a very brief review of the J/psi
result at CERN, we restrict our discussion to the effects of the high-energy
multiple scattering of the quark pair in the colliding nuclei.Comment: 5 pp. talk at Tokyo-Adelaide Joint Workshop,Jan.6 - Jan.10, 2003.
PTPTeX ver.1.
Error- and Loss-Tolerances of Surface Codes with General Lattice Structures
We propose a family of surface codes with general lattice structures, where
the error-tolerances against bit and phase errors can be controlled
asymmetrically by changing the underlying lattice geometries. The surface codes
on various lattices are found to be efficient in the sense that their threshold
values universally approach the quantum Gilbert-Varshamov bound. We find that
the error-tolerance of surface codes depends on the connectivity of underlying
lattices; the error chains on a lattice of lower connectivity are easier to
correct. On the other hand, the loss-tolerance of surface codes exhibits an
opposite behavior; the logical information on a lattice of higher connectivity
has more robustness against qubit loss. As a result, we come upon a fundamental
trade-off between error- and loss-tolerances in the family of the surface codes
with different lattice geometries.Comment: 5pages, 3 figure
Effective Potential Study of the Chiral Phase Transition in a QCD-like Theory
We construct the effective potential for a QCD-like theory using the
auxiliary field method. The chiral phase transition exhibited by the model at
finite temperature and the quark chemical potential is studied from the
viewpoint of the shape change of the potential near the critical point. We
further generalize the effective potential so as to have quark number and
scalar quark densities as independent variables near the tri-critical point.Comment: 17 pages, 9 figures, using PTPTeX.cl
Scalar Glueball--Quarkonium Mixing and the Structure of the QCD Vacuum
We use Ward identities of broken scale invariance to infer the amount of
scalar glueball-- meson mixing from the ratio of quark and gluon
condensates in the QCD vacuum. Assuming dominance by a single scalar state, as
suggested by a phase-shift analysis, we find a mixing angle , corresponding to near-maximal mixing of the glueball and
components.Comment: 7 pages, LaTe
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