Publicação
Underlying-event studies with strange hadrons in pp collisions at √s=13 TeV with the ATLAS detector
| Resumo: | Properties of the underlying-event in pp interac\text{ }tions are investigated primarily via the strange hadrons \( K^0_S \), \( \Lambda \) 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 \( K^0_S \rightarrow \pi^+\pi^- \), \( \Lambda \rightarrow \pi^- p \) 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\text{ }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 \( 10 < p_T \leq 40 \) GeV are studied using the number of prompt charged parti\text{ }cles in the transverse region. The ratio \( N(\Lambda + \bar{\Lambda}) / N(K^0_S) \) 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. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Ciências Naturais::Ciências Físicas |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Properties of the underlying-event in pp interac\text{ }tions are investigated primarily via the strange hadrons \( K^0_S \), \( \Lambda \) 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 \( K^0_S \rightarrow \pi^+\pi^- \), \( \Lambda \rightarrow \pi^- p \) 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\text{ }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 \( 10 < p_T \leq 40 \) GeV are studied using the number of prompt charged parti\text{ }cles in the transverse region. The ratio \( N(\Lambda + \bar{\Lambda}) / N(K^0_S) \) 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. |
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