Search for top-philic heavy resonances in pp collisions at $$\sqrt{s}=13$$ $$\text {TeV}$$ 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, Abicht, NJ ORCID: 0000-0001-5763-2760, 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, Abusleme Hoffman, AC ORCID: 0000-0003-0762-7204 et al (show 2909 more authors) (2024) Search for top-philic heavy resonances in pp collisions at $$\sqrt{s}=13$$ $$\text {TeV}$$ with the ATLAS detector. The European Physical Journal C, 84 (2). 157-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>A search for the associated production of a heavy resonance with a top-quark or a top-antitop-quark pair, and decaying into a <jats:inline-formula><jats:alternatives><jats:tex-math>$$t{\bar{t}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> pair is presented. The search uses the data recorded by the ATLAS detector in <jats:italic>pp</jats:italic> collisions at <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> <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {TeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>TeV</mml:mtext> </mml:math></jats:alternatives></jats:inline-formula> at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 139 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {fb}^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>. Events containing exactly one electron or muon are selected. The two hadronically decaying top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of <jats:inline-formula><jats:alternatives><jats:tex-math>$$R=1$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>. The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {TeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>TeV</mml:mtext> </mml:math></jats:alternatives></jats:inline-formula> to 3.2 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {TeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>TeV</mml:mtext> </mml:math></jats:alternatives></jats:inline-formula>. The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided for a heavy <jats:inline-formula><jats:alternatives><jats:tex-math>$$Z^\prime $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>Z</mml:mi> <mml:mo>′</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> boson based on a simplified model, for <jats:inline-formula><jats:alternatives><jats:tex-math>$$Z^\prime $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>Z</mml:mi> <mml:mo>′</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> mass between 1.0 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {TeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>TeV</mml:mtext> </mml:math></jats:alternatives></jats:inline-formula> and 3.0 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {TeV}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>TeV</mml:mtext> </mml:math></jats:alternatives></jats:inline-formula>. The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters.</jats:p>

Item Type: Article
Divisions: Faculty of Health and Life Sciences
Faculty of Science and Engineering > School of Physical Sciences
Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User: Symplectic Admin
Date Deposited: 21 Mar 2024 16:26
Last Modified: 21 Mar 2024 16:26
DOI: 10.1140/epjc/s10052-023-12318-9
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3179742
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