(Re)interpretation of the LHC results for new physics

Session

Reinterpretation studies

15 Dec 2022, 10:00

4/3-006 - TH Conference Room (CERN)

Conveners

Reinterpretation studies

• Nicholas Wardle (Imperial College (GB))
• Sabine Kraml (LPSC Grenoble)

1. A Novel Experimental Search Channel for Very Light Higgses in the 2HDM Type I

Souad Semlali (School of Physics and Astronomy, University of Southampton)

15/12/2022, 10:00

We present a reinterpretation study of existing results from the CMS Collaboration, specifically, searches for light Beyond the Standard Model (BSM) Higgs pairs produced in the chain decay $pp\to H_{\rm SM}\to hh(aa)$ into a variety of final states, in the context of the CP-conserving 2-Higgs Doublet Model (2HDM) Type-I. Through this, we test the LHC sensitivity to a possible new signature,...

6. Global fits of simplified models for dark matter with GAMBIT

Christopher Chang

15/12/2022, 10:20

Dark matter candidates can arise from a wide range of extensions to the Standard Model. Simplified models with a small number of new particles allow for the optimisation and interpretation of dark matter and collider experiments, without the need for a UV-complete theory. In this talk, I will discuss the results from a recent GAMBIT study of global constraints on vector-mediated simplified...

4. LHC constraints on monojet signatures from electroweakino DM and coloured-superpartner decays

Iñaki Lara Perez

15/12/2022, 10:40

We revisit LHC searches for heavy invisible particles. First recasting a dijet signal region in a general multijet plus missing transverse momentum analysis by ATLAS. We find that non-trivial mass limits can be obtained for the Wino and Higgsino LSP scenarios with the present data. We then study monojet/dijet channels as a tool for searching for squarks and gluinos with distinct mass...

19. Probing the flavor of new physics in semileptonic transitions at high-pT

Felix Wilsch (University of Zurich)

15/12/2022, 11:00

High-$p_T$ tail observables at the LHC offer a complementary probe to low-energy experiments for studying the flavor structure of the Standard Model and beyond. We discuss the high-$p_T$ tails of neutral- and charged-current Drell-Yan processes to probe New Physics (NP) effects in semileptonic transitions. For this purpose, we describe the relevant cross-sections in terms of general...

26. Constraining Dimension7/9 SMEFT from reinterpreting same sign dilepton analysis at CMS

Sitian Qian (Peking University (CN))

15/12/2022, 11:40

The Standard Model Effective Field Theory (SMEFT) provides a model-independent description to the collider events, from which the measured Wilson coefficients can be interpreted with some specific BSM model and vice versa. In the context of SMEFT, operators constructed with odd dimensions may lead to Lepton Number Violation (LNV). In this work, we will present the results of reinterpreting...

3. Model independent measurements of standard model cross sections with domain adaptation

Benedetta Camaiani (Universita e INFN, Firenze (IT))

15/12/2022, 12:00

With the ever growing amount of data collected by the ATLAS and CMS experiments at the CERN LHC, fiducial and differential measurements of the Higgs boson production cross section have become important tools to test the Standard Model predictions with an unprecedented level of precision, as well as seeking deviations that can manifest the presence of physics beyond the standard model. These...

25. Efficient search for new physics using Active Learning in the ATLAS Experiment with RECAST

Irina Espejo Morales (New York University)

15/12/2022, 12:20

Searches for new physics and their reinterpretations constrain the parameter space of models with exclusion limits in typically only few dimensions. However, the relevant theory parameter space often extends into higher dimensions. Limited computing resources for signal process simulations impede the coverage of the full parameter space. We present an Active Learning approach based on the...

5. Reinterpretation of CMS search for LLPs using endcap muon detectors

Christina Wenlu Wang (California Institute of Technology (US))

15/12/2022, 12:40

We present the recast and sensitivity projection in a large number of benchmark models, significantly extending the physics scope of the recent search for LLPs using the CMS endcap muons detector (https://arxiv.org/abs/2107.04838). The search uses the endcap muon detectors as sampling calorimeter to identify displaced showers produced by decays of long-lived particles (LLPs). The exceptional...