Search for heavy Majorana or Dirac neutrinos and right-handed W gauge bosons in final states with charged leptons and jets in pp collisions at $$\sqrt{s}=13$$ 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, Hoffman, AC Abusleme ORCID: 0000-0003-0762-7204 et al (show 2921 more authors) (2023) Search for heavy Majorana or Dirac neutrinos and right-handed W gauge bosons in final states with charged leptons and jets in pp collisions at $$\sqrt{s}=13$$ TeV with the ATLAS detector. The European Physical Journal C, 83 (12). 1164-.

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Abstract

<jats:title>Abstract</jats:title><jats:p>A search for heavy right-handed Majorana or Dirac neutrinos <jats:inline-formula><jats:alternatives><jats:tex-math>$$N_{\textrm{R}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>N</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> and heavy right-handed gauge bosons <jats:inline-formula><jats:alternatives><jats:tex-math>$$W_{\textrm{R}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>W</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> is performed in events with energetic electrons or muons, with the same or opposite electric charge, and energetic jets. The search is carried out separately for topologies of clearly separated final-state products (“resolved” channel) and topologies with boosted final states with hadronic and/or leptonic products partially overlapping and reconstructed as a large-radius jet (“boosted” channel). The events are selected from <jats:italic>pp</jats:italic> collision data at the LHC with an integrated luminosity 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 by the ATLAS detector 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> TeV. No significant deviations from the Standard Model predictions are observed. The results are interpreted within the theoretical framework of a left-right symmetric model, and lower limits are set on masses in the heavy right-handed <jats:inline-formula><jats:alternatives><jats:tex-math>$$W_{\textrm{R}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>W</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> boson and <jats:inline-formula><jats:alternatives><jats:tex-math>$$N_{\textrm{R}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>N</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> plane. The excluded region extends to about <jats:inline-formula><jats:alternatives><jats:tex-math>$$m(W_{\textrm{R}}) = 6.4$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>W</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> <mml:mo>)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>6.4</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV for both Majorana and Dirac <jats:inline-formula><jats:alternatives><jats:tex-math>$$N_{\textrm{R}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>N</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> neutrinos at <jats:inline-formula><jats:alternatives><jats:tex-math>$$m(N_{\textrm{R}})&lt;1$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>N</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> <mml:mo>)</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV. <jats:inline-formula><jats:alternatives><jats:tex-math>$$N_{\textrm{R}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>N</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> with masses of less than 3.5 (3.6) TeV are excluded in the electron (muon) channel at <jats:inline-formula><jats:alternatives><jats:tex-math>$$m(W_{\textrm{R}})=4.8$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>W</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> <mml:mo>)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>4.8</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> TeV for the Majorana neutrinos, and limits of <jats:inline-formula><jats:alternatives><jats:tex-math>$$m(N_{\textrm{R}})$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>N</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> up to 3.6 TeV for <jats:inline-formula><jats:alternatives><jats:tex-math>$$m(W_{\textrm{R}}) = 5.2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>m</mml:mi> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>W</mml:mi> <mml:mtext>R</mml:mtext> </mml:msub> <mml:mo>)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>5.2</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> (5.0) TeV in the electron (muon) channel are set for the Dirac neutrinos. These constitute the most stringent exclusion limits to date for the model considered.</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: 16 Feb 2024 09:04
Last Modified: 17 Mar 2024 19:12
DOI: 10.1140/epjc/s10052-023-12021-9
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3178711
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