Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP06(2021)179
Keywords
Beyond Standard Model; Exotics; Hadron-Hadron scattering (experiments)
Categories
Funding
- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWFW, Austria
- FWF, Austria
- ANAS, Azerbaijan
- SSTC, Belarus
- CNPq, Brazil
- FAPESP, Brazil
- NSERC, Canada
- NRC, Canada
- CFI, Canada
- CERN
- ANID, Chile
- CAS, China
- MOST, China
- NSFC, China
- COLCIENCIAS, Colombia
- MSMT CR, Czech Republic
- MPO CR, Czech Republic
- VSC CR, Czech Republic
- DNRF, Denmark
- DNSRC, Denmark
- IN2P3-CNRS, France
- CEA-DRF/IRFU, France
- SRNSFG, Georgia
- BMBF, Germany
- HGF, Germany
- MPG, Germany
- GSRT, Greece
- RGC, China
- Hong Kong SAR, China
- ISF, Israel
- Benoziyo Center, Israel
- INFN, Italy
- MEXT, Japan
- JSPS, Japan
- CNRST, Morocco
- NWO, Netherlands
- RCN, Norway
- MNiSW, Poland
- NCN, Poland
- FCT, Portugal
- MNE/IFA, Romania
- JINR
- MES of Russia, Russian Federation
- NRC KI, Russian Federation
- MESTD, Serbia
- MSSR, Slovakia
- ARRS, Slovenia
- MIZS, Slovenia
- DST/NRF, South Africa
- MICINN, Spain
- SRC, Sweden
- Wallenberg Foundation, Sweden
- SERI, Switzerland
- SNSF, Switzerland
- Canton of Bern, Switzerland
- MOST, Taiwan
- TAEK, Turkey
- STFC, United Kingdom
- DOE, United States of America
- NSF, United States of America
- BCKDF, Canada
- CANARIE, Canada
- Compute Canada, Canada
- CRC, Canada
- IVADO, Canada
- Beijing Municipal Science & Technology Commission, China
- COST, European Union
- ERC, European Union
- ERDF, European Union
- Horizon 2020, European Union
- Marie Skodowska-Curie Actions, European Union
- Investissements d'Avenir Labex, France
- Investissements d'Avenir Idex, France
- ANR, France
- DFG, Germany
- AvH Foundation, Germany
- Herakleitos programme
- Thales programme
- Aristeia programme
- EU-ESF
- Greek NSRF, Greece
- BSF-NSF, Israel
- GIF, Israel
- La Caixa Banking Foundation, Spain
- CERCA Programme Generalitat de Catalunya, Spain
- PROMETEO Programme Generalitat Valenciana, Spain
- GenT Programme Generalitat Valenciana, Spain
- Goran Gustafssons Stiftelse, Sweden
- Royal Society, United Kingdom
- Canton of Geneva, Switzerland
- Leverhulme Trust, United Kingdom
- Science and Technology Facilities Council [ST/S000879/1] Funding Source: researchfish
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This study presents a search for pair production of third-generation scalar leptoquarks decaying into a top quark and a tau-lepton. Using data from the ATLAS detector at the Large Hadron Collider, no significant excess above the Standard Model expectation is observed in any of the considered event categories, setting 95% CL upper limits on the production cross section as a function of the leptoquark mass. Exclusion limits are set for scalar leptoquarks decaying exclusively into t tau up to masses of 1.43 TeV.
A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a tau-lepton is presented. The search is based on a dataset of pp collisions at root s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb(-1). Events are selected if they have one light lepton (electron or muon) and at least one hadronically decaying tau-lepton, or at least two light leptons. In addition, two or more jets, at least one of which must be identified as containing b-hadrons, are required. Six final states, defined by the multiplicity and flavour of lepton candidates, are considered in the analysis. Each of them is split into multiple event categories to simultaneously search for the signal and constrain several leading backgrounds. The signal-rich event categories require at least one hadronically decaying tau-lepton candidate and exploit the presence of energetic final-state objects, which is characteristic of signal events. No significant excess above the Standard Model expectation is observed in any of the considered event categories, and 95% CL upper limits are set on the production cross section as a function of the leptoquark mass, for different assumptions about the branching fractions into t tau and b nu. Scalar leptoquarks decaying exclusively into t tau are excluded up to masses of 1.43 TeV while, for a branching fraction of 50% into t tau, the lower mass limit is 1.22 TeV.
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