A search for events with two displaced vertices from long-lived particle (LLP) pairs using data collected by the ATLAS detector at the LHC is presented. This analysis uses 139 fb(-1) of proton-proton collision data at root s=13 TeV recorded in 2015-2018. The search employs techniques for reconstructing vertices of LLPs decaying to jets in the muon spectrometer displaced between 3 and 14 m with respect to the primary interaction vertex. The observed numbers of events are consistent with the expected background and limits for several benchmark signals are determined. For the Higgs boson with a mass of 125 GeV, the paper reports the first exclusion limits for branching fractions into neutral long-lived particles below 0.1%, while branching fractions above 10% are excluded at 95% confidence level for LLP proper lifetimes ranging from 4 cm to 72.4 m. In addition, the paper present the first results for the decay of LLPs into (tt) over bar in the ATLAS muon spectrometer.

G. Aad, B. Abbott, D.???C. Abbott, A. Abed Abud, K. Abeling, D.???K. Abhayasinghe, et al. (2022). Search for events with a pair of displaced vertices from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in pp collisions at √ s = 13 TeV. PHYSICAL REVIEW D, 106(3), 032005-1-032005-28 [10.1103/physrevd.106.032005].

Search for events with a pair of displaced vertices from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in pp collisions at √ s = 13 TeV

F. Alfonsi;E. Ballabene;L. Bellagamba;M. Bindi;D. Boscherini;G. Cabras;D. Caforio;G. Carratta;N. Cavalli;L. Clissa;F. Fabbri;L. Fabbri;M. Franchini;A. Gabrielli;B. Giacobbe;L. Massa;A. Polini;L. Rinaldi;M. Romano;C. Sbarra;A. Sbrizzi;N. Semprini-Cesari;M. Sioli;K. Todome;S. Valentinetti;M. Villa;C. Vittori;I. Vivarelli;A. Zoccoli;
2022

Abstract

A search for events with two displaced vertices from long-lived particle (LLP) pairs using data collected by the ATLAS detector at the LHC is presented. This analysis uses 139 fb(-1) of proton-proton collision data at root s=13 TeV recorded in 2015-2018. The search employs techniques for reconstructing vertices of LLPs decaying to jets in the muon spectrometer displaced between 3 and 14 m with respect to the primary interaction vertex. The observed numbers of events are consistent with the expected background and limits for several benchmark signals are determined. For the Higgs boson with a mass of 125 GeV, the paper reports the first exclusion limits for branching fractions into neutral long-lived particles below 0.1%, while branching fractions above 10% are excluded at 95% confidence level for LLP proper lifetimes ranging from 4 cm to 72.4 m. In addition, the paper present the first results for the decay of LLPs into (tt) over bar in the ATLAS muon spectrometer.
2022
G. Aad, B. Abbott, D.???C. Abbott, A. Abed Abud, K. Abeling, D.???K. Abhayasinghe, et al. (2022). Search for events with a pair of displaced vertices from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in pp collisions at √ s = 13 TeV. PHYSICAL REVIEW D, 106(3), 032005-1-032005-28 [10.1103/physrevd.106.032005].
G. Aad; B. Abbott; D.???C. Abbott; A. Abed Abud; K. Abeling; D.???K. Abhayasinghe; S.???H. Abidi; A. Aboulhorma; H. Abramowicz; H. Abreu; Y. Abulaiti;...espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevD.106.032005.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 658.21 kB
Formato Adobe PDF
658.21 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/903491
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 9
  • ???jsp.display-item.citation.isi??? 5
social impact