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 $\sqrt s$=13 TeV - INSPIRE

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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 $\sqrt s$ =13 TeV

ATLAS

Collaboration

Mar 1, 2022

41 pages

Published in:

Phys.Rev.D 106 (2022) 3, 032005

Published: Aug 1, 2022

e-Print:

2203.00587 [hep-ex]

DOI:

10.1103/PhysRevD.106.032005 (publication)

PDG: Long-Lived Particle (LLP) Search at Hadron Collisions

Report number:

CERN-EP-2021-195

Experiments:

CERN-LHC-ATLAS

View in:

reference search39 citations

Citations per year

Abstract: (APS)

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

\sqrt{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

t \bar{t}

in the ATLAS muon spectrometer.

Note:

41 pages in total, author list starting page 25, 5 figures, 5 tables, published in Phys Rev D. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2019-24

p p: colliding beams
neutral particle: pair production
muon: spectrometer
p p: scattering
particle: long-lived
jet: hadronic
neutral particle: long-lived
neutral particle: decay modes
top: pair production
ATLAS

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