Abstract
The sensitivity of the LHC experiments to the associated production of dark matter with a single top is studied in the framework of an extension of the standard model featuring two Higgs doublets and an additional pseudoscalar mediator. It is found that the experimental sensitivity is dominated by the on-shell production of a charged Higgs boson, when this assumes a mass below 1 TeV. Dedicated selections considering one and two lepton final states are developed to assess the coverage in parameter space for this signature at a centre-of-mass energy of 14 TeV assuming an integrated luminosity of 300 fb$^{-1}$. For a pseudoscalar mediator with mass 150 GeV and maximally mixed with the pseudoscalar of the two Higgs doublets, values of $tan\beta$ up to 3 and down to 15 can be excluded at 95% CL, if the $H^{\pm}$ mass is in the range 300 GeV-1 TeV. This novel signature complements the parameter space coverage of the mono-Higgs, mono-Z and $t{\bar t}$+$E_{\mathrm T}^{\mathrm miss}$ signatures considered in previous publications for this model.
Highlights
The nature of the dark matter (DM) is one of the key open questions of contemporary physics, and its experimental investigation is the subject of a worldwide effort based on several different and complementary experimental techniques.The search for particle DM produced at accelerators is an essential part of this programme, and it is vigorously pursued at the CERN LHC, a proton–proton collider currently operating at a centre-of-mass energy of 13 TeV
The samples produced with POWHEG BOX are normalised to the NLO cross section given by the generator, except ttwhich is normalised to the cross section obtained at next-tonext-to-leading order (NNLO) plus next-to-next-to-leading logarithmic accuracy [61,62]
On the basis of the selection criteria defined in the previous section, we study the LHC sensitivity to the DMt signature for an integrated luminosity of fb−1 at
Summary
The nature of the dark matter (DM) is one of the key open questions of contemporary physics, and its experimental investigation is the subject of a worldwide effort based on several different and complementary experimental techniques.The search for particle DM produced at accelerators is an essential part of this programme, and it is vigorously pursued at the CERN LHC, a proton–proton (pp) collider currently operating at a centre-of-mass energy of 13 TeV. Simplified models have become quite popular recently They allow the study of the different possible signatures for DM production at the LHC focusing on the final state kinematics, and thanks to their very limited set of parameters, they provide a very effective mapping of the phenomenological space accessible to experimentation. While handy and in many cases useful, in general simplified models need to be employed with care In some instances they might be too ‘‘simplified’’ to allow for an adequate investigation of the experimental potential of DM searches, as they sometimes neglect unique signatures which may arise from a more complete description of the interactions of DM with the standard model (SM). The jets + W /Z samples are normalised to the known NNLO cross sections [63,64], and the NLO cross sections calculated with MadGraph5_aMC@NLO are used as normalisations for the ttV samples
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