Search for high-mass resonances in final states with a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi></mml:math> -lepton and missing transverse momentum with the ATLAS detector


Aad, G ORCID: 0000-0002-6665-4934, Abbott, B ORCID: 0000-0002-5888-2734, Abbott, DC ORCID: 0000-0002-7248-3203, Abed Abud, A ORCID: 0000-0002-2788-3822, Abeling, K ORCID: 0000-0002-1002-1652, Abhayasinghe, DK ORCID: 0000-0002-2987-4006, Abidi, SH ORCID: 0000-0002-8496-9294, Abramowicz, H ORCID: 0000-0001-5329-6640, Abreu, H ORCID: 0000-0002-1599-2896, Abulaiti, Y ORCID: 0000-0003-0403-3697 et al (show 2864 more authors) (2024) Search for high-mass resonances in final states with a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi></mml:math> -lepton and missing transverse momentum with the ATLAS detector. Physical Review D, 109 (11). 112008-. ISSN 2470-0010, 2470-0029

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Abstract

<jats:p>A search for high-mass resonances decaying into a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>τ</a:mi></a:math>-lepton and a neutrino using proton-proton collisions at a center-of-mass energy of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msqrt><c:mi>s</c:mi></c:msqrt><c:mo>=</c:mo><c:mn>13</c:mn><c:mtext> </c:mtext><c:mtext> </c:mtext><c:mi>TeV</c:mi></c:math> is presented. The full run 2 data sample corresponding to an integrated luminosity of <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mn>139</e:mn><e:mtext> </e:mtext><e:mtext> </e:mtext><e:msup><e:mi>fb</e:mi><e:mrow><e:mo>−</e:mo><e:mn>1</e:mn></e:mrow></e:msup></e:math> recorded by the ATLAS experiment in the years 2015–2018 is analyzed. The <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mi>τ</g:mi></g:math>-lepton is reconstructed in its hadronic decay modes and the total transverse momentum carried out by neutrinos is inferred from the reconstructed missing transverse momentum. The search for new physics is performed on the transverse mass between the <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"><i:mi>τ</i:mi></i:math>-lepton and the missing transverse momentum. No excess of events above the Standard Model expectation is observed and upper exclusion limits are set on the <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" display="inline"><k:msup><k:mi>W</k:mi><k:mo>′</k:mo></k:msup><k:mo stretchy="false">→</k:mo><k:mi>τ</k:mi><k:mi>ν</k:mi></k:math> production cross section. Heavy <n:math xmlns:n="http://www.w3.org/1998/Math/MathML" display="inline"><n:msup><n:mi>W</n:mi><n:mo>′</n:mo></n:msup></n:math> vector bosons with masses up to 5.0 TeV are excluded at 95% confidence level, assuming that they have the same couplings as the Standard Model <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"><p:mi>W</p:mi></p:math> boson. For nonuniversal couplings, <r:math xmlns:r="http://www.w3.org/1998/Math/MathML" display="inline"><r:msup><r:mi>W</r:mi><r:mo>′</r:mo></r:msup></r:math> bosons are excluded for masses less than 3.5–5.0 TeV, depending on the model parameters. In addition, model-independent limits on the visible cross section times branching ratio are determined as a function of the lower threshold on the transverse mass of the <t:math xmlns:t="http://www.w3.org/1998/Math/MathML" display="inline"><t:mi>τ</t:mi></t:math>-lepton and missing transverse momentum.</jats:p> <jats:sec> <jats:title/> <jats:supplementary-material> <jats:permissions> <jats:copyright-statement>© 2024 CERN, for the ATLAS Collaboration</jats:copyright-statement> <jats:copyright-year>2024</jats:copyright-year> <jats:copyright-holder>CERN</jats:copyright-holder> </jats:permissions> </jats:supplementary-material> </jats:sec>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 01 Jul 2024 09:36
Last Modified: 06 Dec 2024 15:10
DOI: 10.1103/physrevd.109.112008
Open Access URL: https://journals.aps.org/prd/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3182558
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