1,268 research outputs found
Nucleon decay matrix elements with the Wilson quark action: an update
We present preliminary results of a new lattice computation of hadronic
matrix elements of baryon number violating operators which appear in the
low-energy effective Lagrangian of (SUSY-)Grand Unified Theories. The
contribution of irrelevant form factor which has caused an underestimate of the
matrix elements in previous studies is subtracted in this calculation. Our
results are 24 times larger than the most conservative values often
employed in phenomenological analyses of nucleon decay with specific GUT
models.Comment: LATTICE99(matrixelements), 3 pages, 2 figure
Entanglement Measures for Intermediate Separability of Quantum States
We present a family of entanglement measures R_m which act as indicators for
separability of n-qubit quantum states into m subsystems for arbitrary 2 \leq m
\leq n. The measure R_m vanishes if the state is separable into m subsystems,
and for m = n it gives the Meyer-Wallach measure while for m = 2 it reduces, in
effect, to the one introduced recently by Love et al. The measures R_m are
evaluated explicitly for the GHZ state and the W state (and its modifications,
the W_k states) to show that these globally entangled states exhibit rather
distinct behaviors under the measures, indicating the utility of the measures
R_m for characterizing globally entangled states as well.Comment: 8 pages, 8 figure
Light hadron spectrum with two flavors of improved dynamical quarks : final results from JLQCD
We present the final results of the JLQCD calculation of the light hadron
spectrum and quark masses with two flavors of dynamical quarks using the
plaquette gauge action and fully -improved Wilson quark action at
. We observe that sea quark effects lead to a closer agreement of
the strange meson and baryon masses with experiment and a reduction of quark
masses by about 25.Comment: 3 pages, 5 figures, Lattice2002 (spectrum
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