Production of KS0, Λ ((Λ)over-bar), Ξ±, and Ω± in jets and in the underlying event in pp and p-Pb collisions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00369685" target="_blank" >RIV/68407700:21340/23:00369685 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/JHEP07(2023)136" target="_blank" >https://doi.org/10.1007/JHEP07(2023)136</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP07(2023)136" target="_blank" >10.1007/JHEP07(2023)136</a>

Result language

angličtina

Original language name

Production of KS0, Λ ((Λ)over-bar), Ξ±, and Ω± in jets and in the underlying event in pp and p-Pb collisions

Original language description

The production of strange hadrons (K-S(0), Lambda, Xi(+/-), and Omega(+/-)), baryon-to-meson ratios (Lambda/K-S(0), Xi/K-S(0), and Omega/K-S(0)), and baryon-to-baryon ratios (Xi/Lambda, Omega/Lambda, and Omega/Xi) associated with jets and the underlying event were measured as a function of transverse momentum (pT) in pp collisions at root s = 13TeV and p-Pb collisions at root s(NN) = 5.02TeV with the ALICE detector at the LHC. The inclusive production of the same particle species and the corresponding ratios are also reported. The production of multi-strange hadrons, Xi(+/-) and Omega(+/-), and their associated particle ratios in jets and in the underlying event are measured for the first time. In both pp and p-Pb collisions, the baryon-to-meson and baryon-to-baryon yield ratios measured in jets differ from the inclusive particle production for low and intermediate hadron p(T) (0.6-6 GeV/ c). Ratios measured in the underlying event are in turn similar to those measured for inclusive particle production. In pp collisions, the particle production in jets is compared with Pythia 8 predictions with three colour-reconnection implementation modes. None of them fully reproduces the data in the measured hadron pT region. The maximum deviation is observed for Xi(+/-) and Omega(+/-) which reaches a factor of about six. The event multiplicity dependence is further investigated in p-Pb collisions. In contrast to what is observed in the underlying event, there is no significant event-multiplicity dependence for particle production in jets. The presented measurements provide novel constraints on hadronisation and its Monte Carlo description. In particular, they demonstrate that the fragmentation of jets alone is insufficient to describe the strange and multi-strange particle production in hadronic collisions at LHC energies.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/LM2018104" target="_blank" >LM2018104: Research Infrastructure for experiments at CERN</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Volume of the periodical

2023

Issue of the periodical within the volume

7

Country of publishing house

IT - ITALY

Number of pages

40

Pages from-to

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UT code for WoS article

001061854200002

EID of the result in the Scopus database

2-s2.0-85165564550