Search for phenomena beyond the Standard Model in events with large b-jet multiplicity using the ATLAS detector at the LHC
EUROPEAN PHYSICAL JOURNAL C, vol.81, no.1, 2021 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 81 Issue: 1
- Publication Date: 2021
- Doi Number: 10.1140/epjc/s10052-020-08730-0
- Journal Name: EUROPEAN PHYSICAL JOURNAL C
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, zbMATH, Directory of Open Access Journals
- Istanbul University Affiliated: Yes
Abstract
A search is presented for new phenomena in events characterised by high jet multiplicity, no leptons (electrons or muons), and four or more jets originating from the fragmentation of b-quarks (b-jets). The search uses 139fb(-1)of s root = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider during Run 2. The dominant Standard Model background originates from multijet production and is estimated using a data-driven technique based on an extrapolation from events with low b-jet multiplicity to the high b-jet multiplicities used in the search. No significant excess over the Standard Model expectation is observed and 95% confidence-level limits that constrain simplified models of R-parity-violating supersymmetry are determined. The exclusion limits reach 950 GeV in top-squark mass in the models considered.