+44-1518-081136Search for electroweak SUSY using Higgs to bb and W leptonic decays with ATLAS
Virtual Meet on 2nd International Conference on Quantum Physics
September 02, 2021 | Webinar
Rima El Kosseifi and Steve Muanza
Aix Marseille University, France
Scientific Tracks Abstracts : Mater Sci Nanotechnol
Abstract:
The R-parity conserving SUSY is one of the most motivated theories beyond the Standard Model. During the Large Hadron Collider (LHC) 8 TeV Run1, many searches were dedicated to this model. Among those, the search for the lightest charging and next-to-lightest neutralino pair production in states with one lepton, two b-jets consistent with a Higgs boson and missing transverse energy. This search had negative outcome resulting in excluding ~__1, ~_02 masses up to 250 GeV for a massless lightest neutralino (~_01) at 95% C.L. The Run1 search used 20.3 fb????1 of 8 TeV ATLAS data collected in 2012. In this talk, this search with ATLAS at LHC 13 TeV Run2 is presented, it uses 36.1 fb????1 ATLAS data collected in 2015 and 2016. This Run 2 search takes advantage of the sensitivity enhancement as the gain in the signal cross section is higher than the gain in the cross section of the main background, tt. Therefore, it provides an unprecedented sensitivity to high mass ~__1, ~_02 production. However, no evidence of new physics is observedand tighter new limits are placed on the ~__1, ~_02 production, with significant improvements over previous searches: ~__1, ~_02 masses up to 680 GeV for a massless neutralino ~_01 are excluded at 95% C.L.
Biography:
Rima El Kosseifi has completed her Ph.D. in particle physics from aix marseille university in november 2018. Her thesis took place during the challenging LHC Run2 phase in 2015-2018 and it contains two parts: experimental and phenomenology. On the phenomenology side, she worked with theorists from "Laboratories Charles Coulomb" Montpellier (France) on a new version of the SUSY spectrum calculator Suspect 3" motivated by the discovery of the Higgs boson at Run1. On the experimental side, her ATLAS authorship project concerned the optimization of b-jets identification in Run2 data taking. More specifically, she studied the impact of several modifications related to the pixel tracker of ATLAS (Run2 conditions) on b-tagging performance. Last, she contributed to the search for the Supersymmetry electroweak pair production of Charging Neutralino with ATLAS using data collected in 2015-2016 at ps = 13 TeV.
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