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

The ATLAS collaboration
Aad, Georges , Aakvaag, Erlend , Abbott, Braden Keim , Abdelhameed, Sara , Abeling, Kira , Abicht, Nils Julius , Abidi, Haider , Aboelela, Mohammed , Aboulhorma, Asmaa , Abramowicz, Halina
CERN-EP-2024-105, 2024.

Abstract (data 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 $K_{S}^{0}\rightarrow\pi^+\pi^-$, $\Lambda\rightarrow\pi^-p$ and $\bar\Lambda\rightarrow\pi^+\bar{p}$. These are used in the construction of underlying-event observables in azimuthal regions computed relative to the leading charged-particle jet in the event. Events with a leading charged-particle jet in the range of $10 < p_{T} \leq 40$ GeV are studied using the number of prompt charged particles in the transverse region.

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