(Re)interpretation of the LHC results for new physics

Session

Reinterpretation studies (pheno)

25 Feb 2025, 14:15

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

20. Exploring a Composite Dark Matter Model Using CONTUR and MadAnalysis5

Clarisse Prat

25/02/2025, 14:15

In this study, we place constraints on a composite t-channel dark matter model using CONTUR and MadAnalysis 5. The model is similar to those currently being studied by the DM working group and is representative of composite dark matter constructions, with a scalar dark matter candidate and three VLQ partners (mediators). We investigate the exclusions obtained from the subprocesses in LO and...

4. Probing exotic long-lived particles from the prompt side using the CONTUR method

Simon Jeannot

25/02/2025, 14:35

A method to derive constraints on new physics models featuring exotic long-lived particles using detector-corrected measurements of prompt states is presented. The CONTUR workflow is modified to either account for the fraction of long-lived particles which decay early enough to be reconstructed as prompt, or to be sensitive to the recoil of such particles against a prompt system. This makes it...

9. Limits on an Exotic Higgs Decay From a Recast ATLAS Four-Lepton Analysis

Junyi Cheng (Harvard University)

25/02/2025, 14:55

The ATLAS collaboration, using 139 fb$^{-1}$ of 13 TeV collisions from the Large Hadron Collider, has placed limits on the decay of a $Z$ boson to three dark photons. We reproduce the results of the ATLAS analysis, and then recast it as a limit on a exotic Higgs decay mode, in which the Higgs boson decays via a pair of intermediate (pseudo)scalars $a$ to four dark photons $V$ (or some other...

19. Constraining composite Higgs models with LHC data

Manuel Kunkel

25/02/2025, 15:15

I will present the results of two recent recasting studies using MadAnalysis5, CheckMATE and Rivet/Contur. I will focus on processes that are interesting for composite Higgs models. The first is a study of Drell-Yan production of extended Higgs sectors, putting upper limits on cross section times branching ratio for a large number of final states. Besides the limits themselves, this serves as...

23. Reinterpreting LHC Dark QCD results

Nicoline Hemme

25/02/2025, 16:10

In this contribution, we will present our recent studies on recasting various ATLAS and CMS analyses in the context of dark QCD models. The analyses were implemented in MadAnalysis5 and the reinterpretation is done focussing on an s-channel Z' portal decaying to two dark quarks which lead to a signature of semi-visible jets with varying invisible fraction.

48. Tri-Lepton Signal of HNL in an EFT Framework

Manimala Mitra

25/02/2025, 16:30

Heavy neutral lepton (HNL) states can exist at the electroweak scale and can be investigated through current and future collider experiments. The scenario, where other new physics interactions occur at scales much higher than the HNL scale, can be described using an effective field theory (EFT) framework known as NR-EFT. We focus on constraining the Wilson coefficients of NR-EFT operators,...

46. Constraints on a Two Mediator Dark Matter Model from Simplified Models

Andre Lessa (CCNH - Univ. Federal do ABC)

25/02/2025, 16:50

We consider a simple Dark Matter model containing both a scalar and a vector mediator. The model provides a framework for generating the mediators and Dark Matter masses while maintaining a small number of free parameters. Using simplified model results from missing energy and resonance searches, we discuss how well this model is probed by current searches and the interplay between the...

41. Dark Matter from Anomaly Cancellation

Hridoy Debnath

25/02/2025, 17:10

We discuss a class of theories that predict a fermionic dark matter candidate from gauge anomaly cancellation. As an explicit example, we study the predictions in theories where the global symmetry associated with baryon number is promoted to a local gauge symmetry. In this context, the symmetry-breaking scale has to be below the multi-TeV scale in order to be in agreement with the...