Abstract
This paper explores the effects of finite width in processes of pair production of an extra heavy quark with charge 2/3 (top partner) and its subsequent decay into a bosonic Dark Matter (DM) candidate -- either scalar or vector -- and SM up-type quarks at the Large Hadron Collider (LHC). This dynamics has been ignored so far in standard experimental searches of heavy quarks decaying to DM and we assess herein the regions of validity of current approaches, based on the assumption that the extra quarks have a narrow width. Further, we discuss the configurations of masses, widths and couplings where the latter breaks down.
Highlights
The existence of new extra quarks (XQs) besides the standard model (SM) ones is among the open problems of particle physics to which the Large Hadron Collider (LHC) may soon provide an answer
This paper explores the effects of finite width in processes of pair production of an extra heavy quark with charge 2=3 and its subsequent decay into a bosonic dark matter (DM) candidate— either scalar or vector—and SM up-type quarks at the Large Hadron Collider (LHC)
Experimental analyses aimed at assessing current LHC limits on the possible existence of XQs, or else at establishing the machine potential in unravelling them, rely upon a narrow width approximation (NWA) emulation of the signal yield, the latter being limited to the contribution of quantum chromodynamics (QCD) induced pair production of such new states of matter
Summary
The existence of new extra quarks (XQs) besides the standard model (SM) ones is among the open problems of particle physics to which the LHC may soon provide an answer. The difference between SUSY and XQ scenarios is only related to the spin of the particles in the interaction: in the XQ case a fermionic mediator decays into bosonic DM, in the SUSY case a scalar mediator decays into fermionic DM For this reason, it is possible to interpret the results of SUSY searches in terms of limits in scenarios with XQs and DM, so that studies exist in literature about such reinterpretations with different assumptions on the coupling properties of the XQs [12,13,14,15,16].
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