Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at root s, root s(NN)=5.02 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00547009" target="_blank" >RIV/68378271:_____/21:00547009 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/21:00547009 RIV/68407700:21340/21:00352799

Výsledek na webu

<a href="https://doi.org/10.1007/JHEP09(2021)211" target="_blank" >https://doi.org/10.1007/JHEP09(2021)211</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP09(2021)211" target="_blank" >10.1007/JHEP09(2021)211</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at root s, root s(NN)=5.02 TeV

Popis výsledku v původním jazyce

Jet fragmentation transverse momentum (j(T)) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at root s(NN) = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-k(T) algorithm with resolution parameter R = 0.4 in the pseudorapidity range vertical bar eta vertical bar < 0.25. The j(T) values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured j(T) distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher j(T) region, while they underestimate the lower j(T) region. The j(T) distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher j(T) values (called the 'wide component'), related to the perturbative component of the fragmentation process, and with a Gaussian for lower j(T) values (called the 'narrow component'), predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum, while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component, the measured trends are successfully described by all models except for Herwig. For the wide component, Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation.

Název v anglickém jazyce

Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at root s, root s(NN)=5.02 TeV

Popis výsledku anglicky

Jet fragmentation transverse momentum (j(T)) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at root s(NN) = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-k(T) algorithm with resolution parameter R = 0.4 in the pseudorapidity range vertical bar eta vertical bar < 0.25. The j(T) values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured j(T) distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher j(T) region, while they underestimate the lower j(T) region. The j(T) distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher j(T) values (called the 'wide component'), related to the perturbative component of the fragmentation process, and with a Gaussian for lower j(T) values (called the 'narrow component'), predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum, while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component, the measured trends are successfully described by all models except for Herwig. For the wide component, Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

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

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

2021

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

32

Strana od-do

211

Kód UT WoS článku

000702783600001

EID výsledku v databázi Scopus

2-s2.0-85116399191