A search for long-lived particles decaying into hadrons is presented. The analysis uses 139 fb−1 of pp collision data collected at √s = 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 R-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 m(g ̃) = 2.4 TeV gluinos, electroweakinos with m(χ ̃01) = 1.5 TeV are excluded with lifetimes in the range of 0.02 ns to 4 ns.

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 / Betti, Alessandra; DE SALVO, Alessandro; DI DOMENICO, Antonio; Dionisi, Carlo.; Bini, Cesare; Luci, Claudio; POMPA PACCHI, Elena; Morodei, Federico; Lacava, Francesco; SAFAI TEHRANI, Francesco; Artoni, Giacomo; Santi, Lorenzo; Padovano, Giovanni; Martinelli, Luca; Maiani, Luciano; Rescigno, Marco; Bauce, Matteo; Gauzzi, Paolo; Gentile, Simonetta; Giagu, Stefano; Ippolito, Valerio; Padovano, Giovanni. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2023:6(2023). [10.1007/JHEP06(2023)200]

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

Betti Alessandra;De Salvo Alessandro;Di Domenico Antonio;Dionisi Carlo.;Bini Cesare;Luci Claudio;Pompa Pacchi Elena;Morodei Federico;Lacava Francesco;Safai Tehrani Francesco;Artoni Giacomo;Santi Lorenzo;Padovano Giovanni;Martinelli Luca;Maiani Luciano;Rescigno Marco;Bauce Matteo;Gauzzi Paolo;Gentile Simonetta;Giagu Stefano;Ippolito Valerio;Padovano Giovanni
2023

Abstract

A search for long-lived particles decaying into hadrons is presented. The analysis uses 139 fb−1 of pp collision data collected at √s = 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 R-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 m(g ̃) = 2.4 TeV gluinos, electroweakinos with m(χ ̃01) = 1.5 TeV are excluded with lifetimes in the range of 0.02 ns to 4 ns.
2023
HEP; SUSY; Exotics; Long Lived Particles
01 Pubblicazione su rivista::01a Articolo in rivista
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 / Betti, Alessandra; DE SALVO, Alessandro; DI DOMENICO, Antonio; Dionisi, Carlo.; Bini, Cesare; Luci, Claudio; POMPA PACCHI, Elena; Morodei, Federico; Lacava, Francesco; SAFAI TEHRANI, Francesco; Artoni, Giacomo; Santi, Lorenzo; Padovano, Giovanni; Martinelli, Luca; Maiani, Luciano; Rescigno, Marco; Bauce, Matteo; Gauzzi, Paolo; Gentile, Simonetta; Giagu, Stefano; Ippolito, Valerio; Padovano, Giovanni. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2023:6(2023). [10.1007/JHEP06(2023)200]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1694185
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