Wednesday, February 15, 2012

1202.2894 (Haipeng An et al.)

Light dark matter and $Z'$ dark force at colliders    [PDF]

Haipeng An, Xiangdong Ji, Lian-Tao Wang
Light Dark Matter, $<10$ GeV, with sizable direct detection rate is an
interesting and less explored scenario. Collider searches can be very powerful,
such as through the channel in which a pair of dark matter particle are
produced in association with a jet. It is a generic possibility that the
mediator of the interaction between DM and the nucleus will also be accessible
at the Tevatron and the LHC. Therefore, collider search of the mediator can
provide a more comprehensive probe of the dark matter and its interactions. In
this article, to demonstrate the complementarity of these two approaches, we
focus on the possibility of the mediator being a new $U(1)'$ gauge boson, which
is probably the simplest model which allows a large direct detection cross
section for a light dark matter candidate. We combine searches in the
monojet+MET channel and dijet resonance search for the mediator. We find that
for the mass of $Z'$ between 250 GeV and 4 TeV, resonance searches at the
colliders provide stronger constraints on this model than the monojet+MET
searches.
View original: http://arxiv.org/abs/1202.2894

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