We propose the study of non-local gauge invariant operators to obtain an uncontaminated ground state for hadrons. The efficiency of the operators is shown by looking at the wave function of the first excited state, which has a node as a function of spatial extent of the operator.Liverpool Preprint LTH-339 (Nov. 1994); hep-lat/9411013
A standing mystery in the Standard Model is the unnatural smallness of the strong CP violating phase. A massless up quark has long been proposed as one potential solution. A lattice calculation of the constants of the chiral Lagrangian essential for the determination of the up quark mass, 2α8 −α5, is presented. We find 2α8 − α5 = 0.29 ± 0.18, which corresponds to mu/m d = 0.410 ± 0.036. This is the first such calculation using a physical number of dynamical light quarks, N f = 3.
We study a closed hadronic string using a pure glue lattice simulation. We measure the energy of the flux state encircling the periodic boundary condition (the torelon). From these data we deduce the string fluctuation component and compare it with models for the hadronic string. We find excellent agreement with the bosonic string model. PACS number(s): 12.38.G~
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