Search for long-lived, massive particles in events with displaced vertices and multiple jets in pp collisions at √s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abeling, K, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC
et al (show 2889 more authors) (2023) Search for long-lived, massive particles in events with displaced vertices and multiple jets in pp collisions at √s=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (6). 200-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search for long-lived particles decaying into hadrons is presented. The analysis uses 139 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> of <jats:italic>pp</jats:italic> collision data collected 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 by the ATLAS detector at the LHC using events that contain multiple energetic jets and a displaced vertex. The search employs dedicated reconstruction techniques that significantly increase the sensitivity to long-lived particles decaying in the ATLAS inner detector. Background estimates for Standard Model processes and instrumental effects are extracted from data. The observed event yields are compatible with those expected from background processes. The results are used to set limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model, and on scenarios with pair-production of supersymmetric particles with long-lived electroweakinos that decay via a small <jats:italic>R</jats:italic>-parity-violating coupling. The pair-production of electroweakinos with masses below 1.5 TeV is excluded for mean proper lifetimes in the range from 0.03 ns to 1 ns. When produced in the decay of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ m\left(\overset{\sim }{g}\right) $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>m</mml:mi> <mml:mfenced> <mml:mover> <mml:mi>g</mml:mi> <mml:mo>~</mml:mo> </mml:mover> </mml:mfenced> </mml:math></jats:alternatives></jats:inline-formula> = 2<jats:italic>.</jats:italic>4 TeV gluinos, electroweakinos with <jats:inline-formula><jats:alternatives><jats:tex-math>$$ m\left({\overset{\sim }{\chi}}_1^0\right) $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>m</mml:mi> <mml:mfenced> <mml:msubsup> <mml:mover> <mml:mi>χ</mml:mi> <mml:mo>~</mml:mo> </mml:mover> <mml:mn>1</mml:mn> <mml:mn>0</mml:mn> </mml:msubsup> </mml:mfenced> </mml:math></jats:alternatives></jats:inline-formula> = 1<jats:italic>.</jats:italic>5 TeV are excluded with lifetimes in the range of 0.02 ns to 4 ns.</jats:p>

Item Type: Article
Uncontrolled Keywords: Beyond Standard Model, Hadron-Hadron Scattering, Supersymmetry
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 18 Sep 2023 16:16
Last Modified: 18 Mar 2024 03:57
DOI: 10.1007/JHEP06(2023)200
Open Access URL: https://link.springer.com/article/10.1007/JHEP06(2...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3172863