Underlying-event studies with strange hadrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

Properties of the underlying-event in $pp$ interactions are investigated primarily via the strange hadrons $K_S^0$, $\Lambda$ and $\bar{\Lambda }$, as reconstructed using the ATLAS detector at the LHC in minimum-bias $pp$ collision data at $\sqrt{s}=13$ TeV. The hadrons are reconstructed via the identification of the displaced two-particle vertices corresponding to the decay modes $K_S^0\to {\pi }^{+}{\pi }^{-}$, $\Lambda \to {\pi }^{-}p$ and $\bar{\Lambda }\to {\pi }^{+}\bar{p}$. These are used in the construction of underlying-event observables in azimuthal regions computed relative to the leading charged-particle jet in the event. None of the hadronisation and underlying-event physics models considered can describe the data over the full kinematic range considered. Events with a leading charged-particle jet in the range of $10<p_T\le 40$ GeV are studied using the number of prompt charged particles in the transverse region. The ratio $N(\Lambda +\bar{\Lambda })/N(K_S^0)$ as a function of the number of such charged particles varies only slightly over this range. This disagrees with the expectations of some of the considered Monte Carlo models.

arXiv comment42 pages in total, author list starting page 25, 7 figures, 1 table, published in Eur. Phys. J. C 84 (2024) 1335. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-60

References in corpus (39)

• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Parton distributions for the LHC
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• EPOS LHC : test of collective hadronization with LHC data
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Performance of the ATLAS Trigger System in 2015
• Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions
• Production and Integration of the ATLAS Insertable B-Layer
• Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC
• Parton-Based Gribov-Regge Theory
• String Formation Beyond Leading Colour
• Observation of sequential Upsilon suppression in PbPb collisions
• Core-Corona Separation in Ultra-Relativistic Heavy Ion Collisions
• Strange Particle Production in pp Collisions at sqrt(s) = 0.9 and 7 TeV
• EPOS Model and Ultra High Energy Cosmic Rays
• Multiplicity dependence of (multi-)strange hadron production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Multiplicity dependence of $\pi$, K, and p production in pp collisions at $\sqrt{s}=13$ TeV
• Charged-particle distributions in $\sqrt{s}=13$ TeV $pp$ interactions measured with the ATLAS detector at the LHC
• The Underlying Event in Hard Interactions at the Tevatron pbarp Collider
• Charged-particle distributions at low transverse momentum in $\sqrt{s}$=13 TeV pp interactions measured with the ATLAS detector at the LHC
• Production of light-flavor hadrons in pp collisions at $\sqrt{s}$ = 7 and $\sqrt{s}$ = 13 TeV
• Measurement of the underlying event in the Drell-Yan process in proton-proton collisions at sqrt(s) = 7 TeV
• Probing Collective Effects in Hadronisation with the Extremes of the Underlying Event
• Baryon production from cluster hadronization
• Measurements of Flavour Dependent Fragmentation Functions in Z^0 -> qq(bar) Events
• Kshort and Lambda production in pp interactions at sqrt(s) = 0.9 and 7 TeV measured with the ATLAS detector at the LHC
• Charged-particle distributions in $pp$ interactions at $\sqrt{s}=8$ TeV measured with the ATLAS detector
• Measurement of charged-particle distributions sensitive to the underlying event in $\sqrt{s}=13$ TeV proton-proton collisions with the ATLAS detector at the LHC
• Properties of jet fragmentation using charged particles measured with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV
• Measurements of the pseudorapidity dependence of the total transverse energy in proton-proton collisions at sqrt(s) = 7 TeV with ATLAS
• Underlying Event properties in pp collisions at $\sqrt{s}$ = 13 TeV
• Measurement of neutral strange particle production in the underlying event in proton-proton collisions at sqrt(s) = 7 TeV
• Production of $\Lambda$ and ${\mathrm{K}}_{\mathrm{S}}^0$ in jets in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and pp collisions at $\sqrt{s}=7$ TeV
• K${}_{\mathrm{S}}^0$- and (anti-)$\Lambda$-hadron correlations in pp collisions at $\sqrt{s}=13$ TeV
• Measurement of $K_S^0$ and ${\Lambda }^0$ production in $t\bar{t}$ dileptonic events in $pp$ collisions at $\sqrt{s}=$ 7 TeV with the ATLAS detector
• Measurements of long-range two-particle correlation over a wide pseudorapidity range in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Cited by in corpus (4)

• Charged-hadron and identified-hadron ($K_{\mathrm{S}}^0$, $\Lambda$, ${\Xi }^{-}$) yield measurements in photo-nuclear Pb+Pb and $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ATLAS
• Sequency Hierarchy Truncation (SeqHT) for Adiabatic State Preparation and Time Evolution in Quantum Simulations
• Soft QCD Physics at the LHC: highlights and opportunities
• From strange-quark tagging to fragmentation tagging with machine learning