Search for excited $$τ$$-leptons and leptoquarks in the final state with $$τ$$-leptons and jets in pp collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS detector
Journal Article
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· Journal of High Energy Physics (Online)
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- Centre National de la Recherche Scientifique (CNRS), Marseille (France). Centre de Physique des Particules de Marseille (CPPM), Institut National de Physique Nucleaire et de Physique des Particules (IN2P3); Aix-Marseille Université (France); The ATLAS Collaboration. et al.
A search is reported for excited $$τ$$-leptons and leptoquarks in events with two hadronically decaying $$τ$$-leptons and two or more jets. The search uses proton-proton ($pp$) collision data at $$\sqrt{s}$$ = 13 TeV recorded by the ATLAS experiment during the Run 2 of the Large Hadron Collider in 2015–2018. The total integrated luminosity is 139 fb-1. The excited $$τ$$-lepton is assumed to be produced and to decay via a four-fermion contact interaction into an ordinary $$τ$$-lepton and a quark-antiquark pair. The leptoquarks are assumed to be produced in pairs via the strong interaction, and each leptoquark is assumed to couple to a charm or lighter quark and a $$τ$$-lepton. No excess over the background prediction is observed. Excited $$τ$$-leptons with masses below 2.8 TeV are excluded at 95% CL in scenarios with the contact interaction scale Λ set to 10 TeV. At the extreme limit of model validity where Λ is set equal to the excited $$τ$$-lepton mass, excited $$τ$$-leptons with masses below 4.6 TeV are excluded. Leptoquarks with masses below 1.3 TeV are excluded at 95% CL if their branching ratio to a charm quark and a $$τ$$-lepton equals 1. The analysis does not exploit flavour-tagging in the signal region.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2282092
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 6 Vol. 2023; ISSN 1029-8479
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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