Properties of the underlying-event in pp interactions are investigated primarily via the strange hadrons K0 S ,  and ¯ , as reconstructed using the ATLAS detector at the LHC in minimum-bias pp collision data at √ s = 13 TeV. The hadrons are reconstructed via the identification of the displaced two-particle vertices corresponding to the decay modes K0 S → π + π −,  → π − p and ¯ → π + ¯ p. These are used in the construction of underlying-event observables in azimuthal regions computed relative to the leading chargedparticle jet in the event. None of the hadronisation and underlying-event physicsmodels considered can describe the data over the full kinematic range considered. Events with a leading charged-particle jet in the range of 10 < pT ≤ 40 GeV are studied using the number of prompt charged particles in the transverse region. The ratio N(+ ¯ )/N(K0 S ) 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.
Underlying-event studies with strange hadrons in pp collisions at $$\sqrt{s} = 13$$ TeV with the ATLAS detector [Underlying-event studies with strange hadrons in pp collisions at √s = 13 TeV with the ATLAS detector ] / G. Aad, E.A.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 84:12(2024 Dec 29), pp. 1335.1-1335.29. [10.1140/epjc/s10052-024-13243-1]
Underlying-event studies with strange hadrons in pp collisions at $$\sqrt{s} = 13$$ TeV with the ATLAS detector [Underlying-event studies with strange hadrons in pp collisions at √s = 13 TeV with the ATLAS detector ]
A. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;E. Mazzeo;C. Meroni;L. Nasella;F. Ragusa;A. Sala;
2024
Abstract
Properties of the underlying-event in pp interactions are investigated primarily via the strange hadrons K0 S , and ¯ , as reconstructed using the ATLAS detector at the LHC in minimum-bias pp collision data at √ s = 13 TeV. The hadrons are reconstructed via the identification of the displaced two-particle vertices corresponding to the decay modes K0 S → π + π −, → π − p and ¯ → π + ¯ p. These are used in the construction of underlying-event observables in azimuthal regions computed relative to the leading chargedparticle jet in the event. None of the hadronisation and underlying-event physicsmodels considered can describe the data over the full kinematic range considered. Events with a leading charged-particle jet in the range of 10 < pT ≤ 40 GeV are studied using the number of prompt charged particles in the transverse region. The ratio N(+ ¯ )/N(K0 S ) 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.| File | Dimensione | Formato | |
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