Searching for $Z^{\prime }$ bosons decaying to gluons

Abstract

The production and decay of a new heavy vector boson, a chromophilic $Z^{\prime }$ vector boson, is described. The chromophilic $Z^{\prime }$ couples only to two gluons, but its two-body decays are absent, leading to a dominant decay mode of $Z^{\prime }\to q\bar{q}g$. The unusual nature of the interaction predicts a cross-section which grows with $m_{Z^{\prime }}$ for a fixed coupling and an accompanying gluon with a coupling that rises with its energy. We study the $t\bar{t}g$ decay mode, proposing distinct reconstruction techniques for the observation of an excess and for the measurement of $m_{Z^{\prime }}$. We estimate the sensitivity of current experimental datasets.

Comments: For submission to PRD