APS April Meeting 2024
Wednesday–Saturday, April 3–6, 2024;
Sacramento & Virtual
Session DD01: V: Physics of the Two Infinities
5:30 AM–7:30 AM,
Thursday, April 4, 2024
Room: Virtual Room 01
Sponsoring
Unit:
APS
Chair: Mohamed Chabab
Abstract: DD01.00007 : Searches for Dark Matter and parasitic collisions with the ATLAS Experiment
7:18 AM–7:30 AM
Abstract
Presenter:
Sanae Ezzarqtouni
(Hassan II University, Casablanca)
Author:
Sanae Ezzarqtouni
(Hassan II University, Casablanca)
The existence of dark matter (DM) is carried by a variety of astrophysical measurements, however the nature and properties of the DM are still largely unidentified. The presence of DM is not predicted by the Standard Model (SM), but many theories beyond the Standard Model (BSM) offer the study of DM. Weakly Interacting Massive Particles (WIMPs, denoted as χ) are frequently used as candidates in several of these theoretical models. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the Large Hadron Collider (LHC) experiments, escaping the detector and leaving a WIMPs are potentially pair-produced in pp collisions at the Large Hadron Collider (LHC).To identify events with DM, additional SM particle(s) (Z,W and h bosons, jet, quarks...) need to be produced in association with DM in a pp collision. The above-mentioned searches, as well as resonance searches looking for mediators decaying into SM particles, are interpreted in the context of so-called Two-Higgs-Doublet Model (2HDM) with a pseudo-scalar mediator (2HDM+a), and Simplified model for dark matter production with a spin-1 mediator. Many interesting results using the LHC Run 2 pp collision data collected at 13 TeV with an integrated luminosity of 139fb−1 have been achieved. In this presentation, our focus lies on exploring the search for Z bosons decaying leptonically alongside a substantial amount of missing transverse energy (E_miss T ), as well as investigating the quest for a low-mass Z' dark matter mediator decaying into two muons. In addition to discussing the searches for dark matter, I will also provide a brief overview of my qualification task within the ATLAS collaboration. This task involved the simulation of parasitic collisions: collisions that happen with other bunches outside the main colliding ones. As an example, collisions with the following bunch at 25 ns would appear to come with a Z offset of 3.75m. Using MC simulations, it would be possible to observe the distributions of key variables (from tracks and energy deposits) for such events at various distances.