Conveners
Open Session C): #1
- Pedro Klaus Schwaller (Mainz University)
- Mario Martinez-Perez (Universitat Autonoma de Barcelona (ES))
Open Session C): #2
- Mario Martinez-Perez (Universitat Autonoma de Barcelona (ES))
- Pedro Klaus Schwaller (Mainz University)
A search is conducted for new physics in final states containing a photon and missing transverse momentum in proton-proton collisions at sqrt(s) = 13 TeV. The data collected by the CMS experiment at the CERN LHC correspond to an integrated luminosity of 35.9 inverse femtobarns. The results are interpreted as exclusion limits on the various dark matter models, such as heavy vector mediators,...
In this work, we consider a model in which the SM gauge group is extended by a lepton number $U(1)_L$. The arising gauge anomalies are canceled by adding two sets of SM vector-like leptons. We further add a scalar field that spontaneously breaks $U(1)_L$. An accidental global symmetry ensures the stability of the lightest additional lepton, thus providing a dark matter candidate. We...
Dark matter production in association with a top quark pair is widely considered the most direct probe of spin-0 mediated dark matter production. A search for tt+DM which incorporates all major decay modes and the first statistical combination of these channels using 35.9/fb collected by the CMS detector in 2016 is presented. The result is the most stringent constraint to date on spin-0...
Searches for dark matter produced in association with heavy quarks using collider data are starting to probe an interesting region of the parameter space, becoming quickly competitive with more traditional searches. Higher order corrections provide a sizeable impact on the total production rate of these models. In this proceedings we study the dependence of the next-to-leading order cross...
Many BSM models with enhanced couplings to third generation fermions have been proposed to incorporate the persistent anomalies observed in flavor physics experiments. Resonance searches with b-jets in the final states provide excellent opportunities to probe this scenario. A search for di-jet resonances with one or two jets identified as b-jets in proton-proton collisions at sqrt = 13 TeV...
Models of composite Higgs provide a natural explanation of the hierarchy problem and a beautiful rationale for the flavor puzzle. However, they typically lack a natural DM candidate unless non-minimal setups with symmetric cosets are considered. Here, I will show an example of a non-symmetric coset - SO(7)/G2 - which nevertheless provide dark pions as viable DM candidates (a scalar SU(2)L...
A wide search program is being carried on at the LHC under the hypothesis that Dark Matter (DM) consist of weakly interacting massive particles (WIMPs). Final states with heavy flavour quarks and large momentum imbalance represent an interesting discovery signature which allows to probe models with scalar or pseudoscalar interactions between the Standard Model and the Dark Sector under the...
A search is performed for dark matter produced in association with tt pairs in data from proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC. The data correspond to 35.9 fb-1 collected with the CMS detector in 2016. The analysis looks for an excess of events with large imbalance in transverse momentum and a top quark pair. The results are interpreted in the context of...
Dark matter scenarios with spin-0 mediators in the s-channel have be tested in well-established processes with missing energy, such as top-pair- and mono-jet-associated production. We suggest electroweak single top production in association with a dark matter pair as an alternative channel. Based on a realistic analysis for the LHC at 13 TeV, we demonstrate how to discriminate between the...
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. Dedicated selections considering one and two...
Dark matter coannihilation via species with only electroweak interactions is generically realised in the MSSM. Key benchmarks include a Higgsino-dominated LSP, or a bino LSP coannihilating with winos or sleptons that are nearby in mass. Hadron collider probes of these compressed scenarios are only recently surpassing nearly two-decade-old LEP limits. A search strategy is presented that opens...
The impact of the current searches at the LHC for monojets is compared to the current limits from direct searches for dark matter (DM) in the framework of the NMSSM. The DM annihilation cross section is ten orders of magnitude larger than limits on the scattering cross section. This can be explained, if the interactions are predominantly due to Higgs exchange, since the Higgs boson couples...
The search for new physics in events with an energetic jet and large missing transverse momentum in the final state plays a major role in the physics program of the ATLAS experiment. This experimental signature is sensitive to a large spectrum of beyond the Standard Model theories including the production of weakly interacting Dark Matter candidates. In this context the most updated results...
In the next-to minimal supersymmetric standard model (NMSSM) an additional singlet-like Higgs boson with small couplings to the standard model (SM) particles is introduced. Although the mass can be well below the discovered 125 GeV Higgs boson its small couplings may make a discovery at the LHC difficult.
We use a novel scanning technique to efficiently scan the whole parameter space and...
A new detector-independent search for dark matter in pp collisions at 13 TeV in final states with jets and missing transverse energy using the ATLAS experiment will be presented. The measured quantity is the cross-section ratio between the production of jets in association with missing transverse energy and the production of jets in association with an opposite-sign same-flavour lepton pair....
