Lattice gluon propagator in renormalizable ξ gauges

We study the SU(3) gluon propagator in renormalizable R-xi gauges implemented on a symmetric lattice with a total volume of (3.25 fm)(4) for values of the gauge fixing parameter up to xi = 0.5. As expected, the longitudinal gluon dressing function stays constant at its tree-level value xi. Similar to the Landau gauge, the transverse R-xi gauge gluon propagator saturates at a nonvanishing value in the deep infrared for all values of xi studied.