Search for excited <i>τ</i>-leptons and leptoquarks in the final state with <i>τ</i>-leptons and jets in <i>pp</i> collisions at √s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abeling, K, Abicht, NJ, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC
et al (show 2922 more authors) (2023) Search for excited <i>τ</i>-leptons and leptoquarks in the final state with <i>τ</i>-leptons and jets in <i>pp</i> collisions at √s=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (6). 199-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search is reported for excited <jats:italic>τ</jats:italic>-leptons and leptoquarks in events with two hadronically decaying <jats:italic>τ</jats:italic>-leptons and two or more jets. The search uses proton-proton (<jats:italic>pp</jats:italic>) collision data at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 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<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. The excited <jats:italic>τ</jats:italic>-lepton is assumed to be produced and to decay via a four-fermion contact interaction into an ordinary <jats:italic>τ</jats:italic>-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 <jats:italic>τ</jats:italic>-lepton. No excess over the background prediction is observed. Excited <jats:italic>τ</jats:italic>-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 <jats:italic>τ</jats:italic>-lepton mass, excited <jats:italic>τ</jats:italic>-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 <jats:italic>τ</jats:italic>-lepton equals 1. The analysis does not exploit flavour-tagging in the signal region.</jats:p>

Item Type: Article
Uncontrolled Keywords: Exotics, Hadron-Hadron Scattering
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 25 Jul 2023 14:30
Last Modified: 18 Mar 2024 03:56
DOI: 10.1007/JHEP06(2023)199
Open Access URL: https://link.springer.com/article/10.1007/JHEP06(2...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3171902