Searching forZ′bosons decaying to gluons

Abstract

The production and decay of a new heavy vector boson, a chromophilic ${Z}^{\ensuremath{'}}$ vector boson, is described. The chromophilic ${Z}^{\ensuremath{'}}$ couples only to two gluons, but its two-body decays are absent, leading to a dominant decay mode of ${Z}^{\ensuremath{'}}\ensuremath{\rightarrow}q\overline{q}g$. The unusual nature of the interaction predicts a cross-section which grows with ${m}_{{Z}^{\ensuremath{'}}}$ for a fixed coupling and an accompanying gluon with a coupling that rises with its energy. We study the $t\overline{t}g$ decay mode, proposing distinct reconstruction techniques for the observation of an excess and for the measurement of ${m}_{{Z}^{\ensuremath{'}}}$. We estimate the sensitivity of current experimental datasets.