Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 82, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-022-10785-0
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Funding
- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWFW, Austria
- FWF, Austria
- ANAS, Azerbaijan
- SSTC, Belarus
- FAPESP, Brazil
- CNPq, Brazil
- NSERC, Canada
- NRC, Canada
- CFI, Canada
- CERN
- ANID, Chile
- CAS, China
- MOST, China
- NSFC, China
- Minciencias, Colombia
- MEYS CR, Czech Republic
- DNRF, Denmark
- DNSRC, Denmark
- IN2P3-CNRS , France
- CEA-DRF/IRFU, France
- SRNSFG, Georgia
- BMBF, Germany
- HGF, Germany
- MPG, Germany
- GSRI, Greece
- RGC, China
- HongKong SAR, China
- ISF, Israel
- Benoziyo Center, Israel
- INFN, Italy
- MEXT , Japan
- JSPS, Japan
- CNRST, Morocco
- NWO, Netherland
- RCN, Norway
- MEiN, Poland
- FCT, Portugal
- MNE/IFA, Romania
- JINR
- MES of Russia
- NRC KI
- MESTD, Serbia
- MSSR, Slovakia
- ARRS, Slovenia
- MIZS, Slovenia
- DSI/NRF, South Africa
- MICINN, Spain
- SRC, Sweden
- Wallenberg Foundation, Sweden
- SERI, Switzerland
- SNSF, Switzerland
- MOST, Taiwan
- TAEK, Turkey
- STFC, UK
- DOE, USA
- NSF, USA
- BCKDF, Canada
- CANARIE, Canada
- Compute Canada, Canada
- CRC, Canada
- COST
- ERC
- ERDF
- Horizon 2020 and Marie Sklodowska-Curie Actions
- European Union
- Investissements d'Avenir Labex, France
- Investissements d'Avenir Idex, France
- ANR, France
- DFG, Germany
- AvH Foundation, Germany
- EU-ESF, Greece
- Greek NSRF, Greece
- BSFNSF, Israel
- GIF, Israel
- Norwegian Financial Mechanism 2014-2021, Norway
- NCN Poland
- La Caixa Banking Foundation, Spain
- CERCA Programme Generalitat de Catalunya, Spain
- Russian Federation
- NAWA, Poland
- PROMETEO Programme Generalitat Valenciana, Spain
- GenT Programme Generalitat Valenciana, Spain
- Goran Gustafssons Stiftelse, Sweden
- Royal Society, UK
- Leverhulme Trust, UK
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This study presents a search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism. The results show no significant deviations from the Standard Model expectation and derive upper and lower limits on the heavy lepton production cross-section and masses.
A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV, corresponding to 139 fb(-1) of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on final states with three or four electrons or muons from the possible decays of new heavy leptons via intermediate electroweak bosons. No significant deviations above the Standard Model expectation are observed; upper and lower limits on the heavy lepton production cross-section and masses are derived respectively. These results are then combined for the first time with the ones already published by ATLAS using the channel with two leptons in the final state. The observed lower limit on the mass of the type-III seesaw heavy leptons combining two, three and four lepton channels together is 910 GeV at the 95% confidence level.
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