Azimuthal decorrelation in t(t)over-bar production at hadron colliders

Abstract

We present a new observable, Delta phi, an azimuthal angle difference between t and (t) over bar quarks in t (t) over bar pair production at hadron colliders as an interesting probe of the radiative quantum chromodynamics process as well as a high-order correction in the high-mass regime. This variable also enables good discrimination on some new physics models that may explain the forward-backward charge asymmetry of t (t) over bar production measured at the Tevatron. With a reliable estimation of the data set obtained up to 2011 at the Tevatron and Large Hadron Collider, we present an opportunity for testing the standard model as well as searching new physics models with the Delta phi observable in the lepton + jets decay channel. DOI: 10.1103/PhysRevD.87.034012