15,398 research outputs found
Screening Masses and Improvement in Pure SU(2) Lattice Gauge Theory at High Temperatures
From the long-distance behaviour of gluon and Polyakov loop correlation
functions we extract masses resp. energies in the electric and magnetic
sectors. We discuss their dependence on the temperature and on the momentum as
well as the relevance of an improvement of the lattice discretization of the
action.Comment: Talk presented at LATTICE97 (Finite Temperature and Density) by J.
Rank, 3 pages, LaTeX File, espcrc2.sty Style File and 2 eps figures include
Quantum Flux and Reverse Engineering of Quantum Wavefunctions
An interpretation of the probability flux is given, based on a derivation of
its eigenstates and relating them to coherent state projections on a quantum
wavefunction. An extended definition of the flux operator is obtained using
coherent states. We present a "processed Husimi" representation, which makes
decisions using many Husimi projections at each location. The processed Husimi
representation reverse engineers or deconstructs the wavefunction, yielding the
underlying classical ray structure. Our approach makes possible interpreting
the dynamics of systems where the probability flux is uniformly zero or
strongly misleading. The new technique is demonstrated by the calculation of
particle flow maps of the classical dynamics underlying a quantum wavefunction.Comment: Accepted to EP
Single spin asymmetries in inclusive hadron production from SIDIS to hadronic collisions: universality and phenomenology
In a perturbative QCD approach, with inclusion of spin and transverse
momentum effects, experimental data on azimuthal asymmetries observed in
polarized semi-inclusive deeply inelastic scattering and e+ e- annihilations
can be used to determine the Sivers, transversity and Collins soft functions.
By using these functions, within the same scheme, we predict p(transv.
polarized) p -> h + X single spin asymmetries in remarkable agreement with RHIC
experimental data.Comment: 5 pages, 6 ps figure
Eigenvalue distribution of the Dirac operator at finite temperature with (2+1)-flavor dynamical quarks using the HISQ action
We report on the behavior of the eigenvalue distribution of the Dirac
operator in (2+1)-flavor QCD at finite temperature, using the HISQ action. We
calculate the eigenvalue density at several values of the temperature close to
the pseudocritical temperature. For this study we use gauge field
configurations generated on lattices of size with two light
quark masses corresponding to pion masses of about 160 and 115 MeV. We find
that the eigenvalue density below receives large contributions from
near-zero modes which become smaller as the temperature increases or the light
quark mass decreases. Moreover we find no clear evidence for a gap in the
eigenvalue density up to 1.1. We also analyze the eigenvalue density near
where it appears to show a power-law behavior consistent with what is
expected in the critical region near the second order chiral symmetry restoring
phase transition in the massless limit.Comment: 7 pages, 7 figures, talk presented at the XXIX International
Symposium on Lattice Field Theory, July 10-16 2011, Squaw Valley, Lake Tahoe,
California, US
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