Abstract
A first search for pair production of dark matter candidates through vector boson fusion in proton-proton collisions at sqrt[s]=8 TeV is performed with the CMS detector. The vector boson fusion topology enhances missing transverse momentum, providing a way to probe supersymmetry, even in the case of a compressed mass spectrum. The data sample corresponds to an integrated luminosity of 18.5 fb^{-1}, recorded by the CMS experiment. The observed dijet mass spectrum is consistent with the standard model expectation. In an effective field theory, dark matter masses are explored as a function of contact interaction strength. The most stringent limit on bottom squark production with mass below 315GeV is also reported, assuming a 5GeV mass difference with respect to the lightest neutralino.
Highlights
Cosmological measurements indicate that dark matter (DM) constitutes 85% of all matter in the Universe [1]
This Letter describes the first search for direct pair production of DM through pure electroweak vector boson fusion (VBF) processes at a hadron collider
The VBF production mechanism provides a probe of DM that is agnostic to the accessibility of heavier-colored or electroweak sectors
Summary
Cosmological measurements indicate that dark matter (DM) constitutes 85% of all matter in the Universe [1]. For the Zð→ ννÞ þ jets background, we use three control regions to verify the MC simulation, estimate acceptance corrections used to scale the MC yields, and measure the fraction of events passing the VBF topology selection. For the CRZ2 control region, which is a subset of CRZ1, we treat the two muons as neutrinos, subtract the muon pT vectors from p~mT iss, and require pmT iss > 250 GeV together with a veto on b-tagged jets and additional leptons, as in the analysis selection.
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