Light-flavor particle production in high-multiplicity pp collisions at root s=13 TeV as a function of transverse spherocity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00379777" target="_blank" >RIV/68407700:21340/24:00379777 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/JHEP05(2024)184" target="_blank" >https://doi.org/10.1007/JHEP05(2024)184</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP05(2024)184" target="_blank" >10.1007/JHEP05(2024)184</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Light-flavor particle production in high-multiplicity pp collisions at root s=13 TeV as a function of transverse spherocity

Popis výsledku v původním jazyce

Results on the transverse spherocity dependence of light-flavor particle production (pi, K, p,phi, K-*0, K-S(0),Lambda.,Xi) at midrapidity in high-multiplicity pp collisions at root s = 13TeV were obtained with the ALICE apparatus. The transverse spherocity estimator ( S-O(pT)=1) categorizes events by their azimuthal topology. Utilizing narrow selections on S-O(pT)=1, it is possible to contrast particle production in collisions dominated by many soft initial interactions with that observed in collisions dominated by one or more hard scatterings. Results are reported for two multiplicity estimators covering different pseudorapidity regions. The S-O(pT-1) estimator is found to effectively constrain the hardness of the events when the midrapidity (|eta| < 0.8) estimator is used. The production rates of strange particles are found to be slightly higher for soft isotropic topologies, and severely suppressed in hard jet-like topologies. These effects are more pronounced for hadrons with larger mass and strangeness content, and observed when the topological selection is done within a narrow multiplicity interval. This demonstrates that an important aspect of the universal scaling of strangeness enhancement with final-state multiplicity is that high-multiplicity collisions are dominated by soft, isotropic processes. On the contrary, strangeness production in events with jet-like processes is significantly reduced. The results presented in this article are compared with several QCD-inspired Monte Carlo event generators. Models that incorporate a two-component phenomenology, either through mechanisms accounting for string density, or thermal production, are able to describe the observed strangeness enhancement as a function of S-O(pT=1) .

Název v anglickém jazyce

Light-flavor particle production in high-multiplicity pp collisions at root s=13 TeV as a function of transverse spherocity

Popis výsledku anglicky

Results on the transverse spherocity dependence of light-flavor particle production (pi, K, p,phi, K-*0, K-S(0),Lambda.,Xi) at midrapidity in high-multiplicity pp collisions at root s = 13TeV were obtained with the ALICE apparatus. The transverse spherocity estimator ( S-O(pT)=1) categorizes events by their azimuthal topology. Utilizing narrow selections on S-O(pT)=1, it is possible to contrast particle production in collisions dominated by many soft initial interactions with that observed in collisions dominated by one or more hard scatterings. Results are reported for two multiplicity estimators covering different pseudorapidity regions. The S-O(pT-1) estimator is found to effectively constrain the hardness of the events when the midrapidity (|eta| < 0.8) estimator is used. The production rates of strange particles are found to be slightly higher for soft isotropic topologies, and severely suppressed in hard jet-like topologies. These effects are more pronounced for hadrons with larger mass and strangeness content, and observed when the topological selection is done within a narrow multiplicity interval. This demonstrates that an important aspect of the universal scaling of strangeness enhancement with final-state multiplicity is that high-multiplicity collisions are dominated by soft, isotropic processes. On the contrary, strangeness production in events with jet-like processes is significantly reduced. The results presented in this article are compared with several QCD-inspired Monte Carlo event generators. Models that incorporate a two-component phenomenology, either through mechanisms accounting for string density, or thermal production, are able to describe the observed strangeness enhancement as a function of S-O(pT=1) .

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2023040" target="_blank" >LM2023040: Výzkumná infrastruktura pro experimenty v CERN</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

2024

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

57

Strana od-do

—

Kód UT WoS článku

001280131100001

EID výsledku v databázi Scopus

2-s2.0-85205866085