2 research outputs found
Revisiting monotop production at the LHC
Scenarios of new physics where a single top quark can be produced in
association with large missing energy (monotop) have been recently studied both
from the theoretical point of view and by experimental collaborations. We
revisit the originally proposed monotop setup by embedding the effective
couplings of the top quark in an SU(2)L invariant formalism. We show that
minimality selects one model for each of the possible production mechanisms: a
scalar field coupling to a right-handed top quark and an invisible fermion when
the monotop system is resonantly produced, and a vector field mediating the
interactions of a dark sector to right-handed quarks for the non-resonant
production mode. We study in detail constraints on the second class of
scenarios, originating from contributions to standard single top processes when
the mediator is lighter than the top quark and from the dark matter relic
abundance when the mediator is heavier than the top quark.Comment: 24 pages, 7 figures; version accepted by JHE