When the SM is interpreted as the renormalizable sector of an EFT, the effects of new physics are encoded into a set of higher-dimensional operators. These operators potentially deform the shapes of SM differential distributions of final states observable at the LHC. We describe a method to obtain optimal estimations of these deformations when using numerical tools, like MC simulations. We...
We recast ATLAS and CMS monojet searches for the complete set of dimension 5&6 effective operators involving DM. We demonstrate that DM with different spins give a different energy dependence of the cross-sections and to different distributions of the invariant mass of the DM pair, and consequently to different MET distributions. Using this feature and projecting our results for high...
I will discuss the phenomenology of colored scalars with exotic electric charges, in particular i will focus on non standard SU(2) multiplets.
I will describe the LHC signatures arising from their production showing that, in some significant scenarios, the limits can still be very mild allowing for the existence of several light scalars below 500 GeV.
Finally I will talk about the...
Composite Higgs Models are often constructed including fermionic top partners with a mass around the TeV scale, with the top partners playing the role of stabilizing the Higgs potential and enforcing partial compositeness for the top quark. A class of models of this kind can be formulated in terms of fermionic strongly coupled gauge theories. A common feature they all share is the presence of...
Recently, ATLAS reported a 3.3σ excess in the stop search with ℓ+jets+EmissT channel. We try to interpret the signal by a light stop pair production in the MSSM. We find: (1) simple models where stop decays into a higgsino or a bino are not favored. (2) an extension of them can explain the data at 2σ level without conflicting with the other search channels. A surviving possibility includes a...
I will present the latest constraints on various simplified models of natural SUSY with light higgsinos, stops and gluinos, using a detailed and comprehensive reinterpretation of the most recent 13 TeV ATLAS and CMS searches with ∼15 fb$^{−1}$ of data. We discuss the implications of these constraints for fine-tuning of the electroweak scale. While the most "vanilla" version of SUSY (the MSSM...
We investigate multi-lepton signals produced by ElectroWeakino (EWino) decays in the MSSM and the TMSSM scenarios with sfermions, gluinos and non Standard Model Higgses at the TeV scale, being the Bino electroweak-scale dark matter. We recast the present LHC constraints on EWinos for these models and we find that wide MSSM and TMSSM parameter regions prove to be allowed. We forecast the number...
Light neutralinos/charginos are an attractive scenario in the NMSSM: The relic density of Dark matter is easily in the WMAP/Planck range, bounds from direct detection are easily satisfied, and fine-tuning is alleviated. The most promising search channels at the LHC are three leptons plus MET. (Possible are one lepton + Higgs + MET and/or four leptons + MET.) Scanning the parameter space of the...
How does sensitivity designed around simplified models map onto realistic R-parity conserving supersymmetry scenarios? The 19-parameter p(henomenological)MSSM accounts for non-LHC constraints, and we interpret six 13 TeV 3.2/fb ATLAS searches for gluinos and squarks as a case study. We analyse previously unexplored correlations of the most sensitive analyses and find striking complementarity...
A number of theories beyond the Standard Model predict heavy top partners as well as dark matter candidates. We show how ATLAS and CMS at Run 1 searches in the $t\bar{t}+E_T^{miss}$ final state, typically interpreted in the context of a stop-neutralino simplified model, constrain scenarios with a fermonic top partner and a dark matter candidate. We find that the efficiencies are very similar...
I discuss the feasibility to search for supersymmetry in Z' decays at the LHC, in U(1)' and Supersymmetric Standard Model, by investigating final states with charged leptons and missing energy. I also investigate decays into pairs of the lightest MSSM neutralinos, which are Dark Matter candidates, and update the exclusion limits on the Z' mass, accounting for the inclusion of BSM decay modes.
We recast ATLAS displaced vertex searches to a next-to-minimal gauge mediated model originally invented by Delgado, Giudice and Slavich. The singlino decays may be dislpaced, producing b bbar pairs and missing energy. This signal has terrible efficiency with ATLAS cuts as they were set in the ATLAS analysis. Characterising detector response to displaced vertices is extremely difficult.
