Search for pair production of third-generation leptoquarks decaying into a bottom quark and a $$\tau $$-lepton with the ATLAS detector


Aad, G ORCID: 0000-0002-6665-4934, Abbott, B ORCID: 0000-0002-5888-2734, Abeling, K ORCID: 0000-0002-1002-1652, Abidi, SH ORCID: 0000-0002-8496-9294, Aboulhorma, A ORCID: 0000-0002-9987-2292, Abramowicz, H ORCID: 0000-0001-5329-6640, Abreu, H ORCID: 0000-0002-1599-2896, Abulaiti, Y ORCID: 0000-0003-0403-3697, Hoffman, AC Abusleme ORCID: 0000-0003-0762-7204, Acharya, BS ORCID: 0000-0002-8588-9157 et al (show 2869 more authors) (2023) Search for pair production of third-generation leptoquarks decaying into a bottom quark and a $$\tau $$-lepton with the ATLAS detector. The European Physical Journal C, 83 (11). 1075-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>A search for pair-produced scalar or vector leptoquarks decaying into a <jats:italic>b</jats:italic>-quark and a <jats:inline-formula><jats:alternatives><jats:tex-math>$$\tau $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-lepton is presented using the full LHC Run 2 (2015–2018) data sample of 139 fb<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> collected with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s} =13$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV. Events in which at least one <jats:inline-formula><jats:alternatives><jats:tex-math>$$\tau $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Standard Model expectation are observed and 95% confidence-level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathcal {B}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>B</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> into a <jats:inline-formula><jats:alternatives><jats:tex-math>$$\tau $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-lepton and <jats:italic>b</jats:italic>-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathcal {B}=100$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>B</mml:mi> <mml:mo>=</mml:mo> <mml:mn>100</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>%, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 16 Feb 2024 09:34
Last Modified: 16 Mar 2024 02:51
DOI: 10.1140/epjc/s10052-023-12104-7
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3178726
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