Cucchieri, A.Mendes, T.Taurines, A. R.2014-05-202014-05-202005-03-01Physical Review D. College Pk: American Physical Soc, v. 71, n. 5, 5 p., 2005.0556-2821http://hdl.handle.net/11449/23549We present explicit numerical evidence of reflection-positivity violation for the lattice Landau gluon propagator in three-dimensional pure SU(2) gauge theory. We use data obtained at very large lattice volumes (V = 80(3), 140(3)) and for three different lattice couplings in the scaling region (beta = 4.2, 5.0, 6.0). In particular, we observe a clear oscillatory pattern in the real-space propagator C(t). We also verify that the (real-space) data show good scaling in the range t is an element of[0, 3]fm and can be fitted using a Gribov-like form. The violation of positivity is in contradiction with a stable-particle interpretation of the associated field theory and may be viewed as a manifestation of confinement.5engArtigo10.1103/PhysRevD.71.051902WOS:000228490000010Acesso restritoWOS000228490000010.pdf