Repository logo
 

Search for direct production of electroweakinos in final states with one lepton, jets and missing transverse momentum in pp collisions at (Formula presented.) TeV with the ATLAS detector

Published version
Peer-reviewed

Repository DOI


Change log

Authors

Aad, G 
Abbott, B 
Abeling, K 
Abicht, NJ 
Abidi, SH 

Abstract

jats:titleAjats:scbstract</jats:sc> </jats:title>jats:pSearches for electroweak production of wino-like chargino pairs, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{+}{\overset{\sim }{\chi}}_1^{-} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo+</mml:mo> </mml:msubsup> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo−</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>, and of wino-like chargino and next-to-lightest neutralino, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{\pm }{\overset{\sim }{\chi}}_2^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo±</mml:mo> </mml:msubsup> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>, are presented. The models explored assume that the charginos decay into a jats:italicW</jats:italic> boson and the lightest neutralino, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{\pm}\to {W}^{\pm }{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo±</mml:mo> </mml:msubsup> mml:mo→</mml:mo> mml:msup mml:miW</mml:mi> mml:mo±</mml:mo> </mml:msup> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>. The next-to-lightest neutralinos are degenerate in mass with the chargino and decay to jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> and either a jats:italicZ</jats:italic> or a Higgs boson, jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_2^0\to Z{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> mml:mo→</mml:mo> mml:miZ</mml:mi> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> or jats:inline-formulajats:alternativesjats:tex-math$$ h{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:mih</mml:mi> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>. The searches exploit the presence of a single isolated lepton and missing transverse momentum from the jats:italicW</jats:italic> boson decay products and the lightest neutralinos, and the presence of jets from hadronically decaying jats:italicZ</jats:italic> or jats:italicW</jats:italic> bosons or from the Higgs boson decaying into a pair of jats:italicb</jats:italic>-quarks. The searches use 139 fbjats:supjats:italic−</jats:italic>1</jats:sup> of jats:inline-formulajats:alternativesjats:tex-math$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msqrt mml:mis</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV proton-proton collisions data collected by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. No deviations from the Standard Model expectations are found, and 95% confidence level exclusion limits are set. Chargino masses ranging from 260 to 520 GeV are excluded for a massless jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> in chargino pair production models. Degenerate chargino and next-to-lightest neutralino masses ranging from 260 to 420 GeV are excluded for a massless jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> for jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_2^0\to Z{\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> mml:mo→</mml:mo> mml:miZ</mml:mi> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula>. For decays through an on-shell Higgs boson and for mass-splitting between jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^{\pm }/{\overset{\sim }{\chi}}_2^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mo±</mml:mo> </mml:msubsup> mml:mo/</mml:mo> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn2</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> and jats:inline-formulajats:alternativesjats:tex-math$$ {\overset{\sim }{\chi}}_1^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> mml:msubsup mml:mover mml:miχ</mml:mi> mml:mo~</mml:mo> </mml:mover> mml:mn1</mml:mn> mml:mn0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> as small as the Higgs boson mass, mass limits are improved by up to 40 GeV in the range of 200–260 GeV and 280–470 GeV compared to previous ATLAS constraints.</jats:p>

Description

Acknowledgements: We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRI, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TENMAK, Türkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; COST, ERC, ERDF, Horizon 2020, ICSC-NextGenerationEU and Marie Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex, Investissements d’Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Göran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (U.K.) and BNL (U.S.A.), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in ref. [124].

Keywords

5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences

Journal Title

Journal of High Energy Physics

Conference Name

Journal ISSN

1126-6708
1029-8479

Volume Title

2023

Publisher

Springer Science and Business Media LLC