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Search for direct pair production of sleptons and charginos decaying to two leptons and neutralinos with mass splittings near the W-boson mass in √s = 13 TeV pp collisions with the ATLAS detector ATLAS Collaboration

Abstract

A search for the electroweak production of pairs of charged sleptons or charginos decaying into two-lepton final states with missing transverse momentum is presented. Two simplified models of R-parity-conserving supersymmetry are considered: direct pairproduction of sleptons (˜` ˜`), with each decaying into a charged lepton and a χ˜ 0 1 neutralino, and direct pair-production of the lightest charginos (χ˜ ± 1 χ˜ ∓ 1 ), with each decaying into a Wboson and a χ˜ 0 1 . The lightest neutralino (χ˜ 0 1 ) is assumed to be the lightest supersymmetric particle (LSP). The analyses target the experimentally challenging mass regions where m( ˜`) − m(χ˜ 0 1 ) and m(χ˜ ± 1 ) − m(χ˜ 0 1 ) are close to the W-boson mass (‘moderately compressed’ regions). The search uses 139 fb−1 of √ s = 13 TeV proton-proton collisions recorded by the ATLAS detector at the Large Hadron Collider. No significant excesses over the expected background are observed. Exclusion limits on the simplified models under study are reported in the (˜`, χ˜ 0 1 ) and (χ˜ ± 1 , χ˜ 0 1 ) mass planes at 95% confidence level (CL). Sleptons with masses up to 150 GeV are excluded at 95% CL for the case of a mass-splitting between sleptons and the LSP of 50 GeV. Chargino masses up to 140 GeV are excluded at 95% CL for the case of a mass-splitting between the chargino and the LSP down to about 100 GeV

Item Metadata

Title
Search for direct pair production of sleptons and charginos decaying to two leptons and neutralinos with mass splittings near the W-boson mass in √s = 13 TeV pp collisions with the ATLAS detector
Creator
ATLAS Collaboration
Publisher
Springer Berlin Heidelberg
Date Issued
2023-06-06
Description
A search for the electroweak production of pairs of charged sleptons or charginos decaying into two-lepton final states with missing transverse momentum is presented. Two simplified models of R-parity-conserving supersymmetry are considered: direct pairproduction of sleptons (˜` ˜`), with each decaying into a charged lepton and a χ˜ 0 1 neutralino, and direct pair-production of the lightest charginos (χ˜ ± 1 χ˜ ∓ 1 ), with each decaying into a Wboson and a χ˜ 0 1 . The lightest neutralino (χ˜ 0 1 ) is assumed to be the lightest supersymmetric particle (LSP). The analyses target the experimentally challenging mass regions where m( ˜`) − m(χ˜ 0 1 ) and m(χ˜ ± 1 ) − m(χ˜ 0 1 ) are close to the W-boson mass (‘moderately compressed’ regions). The search uses 139 fb−1 of √ s = 13 TeV proton-proton collisions recorded by the ATLAS detector at the Large Hadron Collider. No significant excesses over the expected background are observed. Exclusion limits on the simplified models under study are reported in the (˜`, χ˜ 0 1 ) and (χ˜ ± 1 , χ˜ 0 1 ) mass planes at 95% confidence level (CL). Sleptons with masses up to 150 GeV are excluded at 95% CL for the case of a mass-splitting between sleptons and the LSP of 50 GeV. Chargino masses up to 140 GeV are excluded at 95% CL for the case of a mass-splitting between the chargino and the LSP down to about 100 GeV
Subject
Hadron-Hadron Scattering; Supersymmetry
Genre
Article
Type
Text
Language
eng
Date Available
2023-09-12
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0435858
URI
http://hdl.handle.net/2429/85901
Affiliation
Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation
Journal of High Energy Physics. 2023 Jun 06;2023(6):31
Publisher DOI
10.1007/JHEP06(2023)031
Peer Review Status
Reviewed
Scholarly Level
Faculty; Researcher
Copyright Holder
The Author(s)
Rights URI
http://creativecommons.org/licenses/by/4.0/
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Attribution 4.0 International (CC BY 4.0)