Lambda(c+) Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at root s(NN)=5.02 TeV at the LHC

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00551810" target="_blank" >RIV/68378271:_____/21:00551810 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/21:00551810

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevLett.127.202301" target="_blank" >https://doi.org/10.1103/PhysRevLett.127.202301</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.127.202301" target="_blank" >10.1103/PhysRevLett.127.202301</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lambda(c+) Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at root s(NN)=5.02 TeV at the LHC

Popis výsledku v původním jazyce

The prompt production of the charm baryon Lambda(c+) and the Lambda(c+)/D-0 production ratios were measured at midrapidity with the ALICE detector in pp and (p)-Pb collisions at root sNN = 5.02 TeV. These new measurements show a clear decrease of the Lambda(+)(c)/D-0 ratio with increasing transverse momentum (p(T)) in both collision systems in the range 2 < P-T < 12 GeV/c, exhibiting similarities with the light-flavor baryon-tomeson ratios p/pi and Lambda/K-S(0). At low p(T), predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charmquark fragmentation processes measured in e(+) e(-) and e(-) p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.

Název v anglickém jazyce

Lambda(c+) Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at root s(NN)=5.02 TeV at the LHC

Popis výsledku anglicky

The prompt production of the charm baryon Lambda(c+) and the Lambda(c+)/D-0 production ratios were measured at midrapidity with the ALICE detector in pp and (p)-Pb collisions at root sNN = 5.02 TeV. These new measurements show a clear decrease of the Lambda(+)(c)/D-0 ratio with increasing transverse momentum (p(T)) in both collision systems in the range 2 < P-T < 12 GeV/c, exhibiting similarities with the light-flavor baryon-tomeson ratios p/pi and Lambda/K-S(0). At low p(T), predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charmquark fragmentation processes measured in e(+) e(-) and e(-) p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.

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/LTT17018" target="_blank" >LTT17018: Získávání nových poznatků o mikrosvětě v infrastruktuře CERN</a><br>

Návaznosti

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

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

1079-7114

Svazek periodika

127

Číslo periodika v rámci svazku

20

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

202301

Kód UT WoS článku

000718362900002

EID výsledku v databázi Scopus

2-s2.0-85119185893