Centrality dependence of J/psi and psi(2S) production and nuclear modification in p-Pb collisions at root s(NN)=8.16 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00540940" target="_blank" >RIV/68378271:_____/21:00540940 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/21:00540940

Výsledek na webu

<a href="https://doi.org/10.1007/JHEP02(2021)002" target="_blank" >https://doi.org/10.1007/JHEP02(2021)002</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP02(2021)002" target="_blank" >10.1007/JHEP02(2021)002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Centrality dependence of J/psi and psi(2S) production and nuclear modification in p-Pb collisions at root s(NN)=8.16 TeV

Popis výsledku v původním jazyce

The inclusive production of the J/ and psi (2S) charmonium states is studied as a function of centrality in p-Pb collisions at a centre-of-mass energy per nucleon pair at root s NN = 8.16 TeV at the LHC. The measurement is performed in the dimuon decay channel with the ALICE apparatus in the centre-of-mass rapidity intervals -4.46 < y(cms)< -2.96 (Pb-going direction) and 2.03 < y(cms)< 3.53 (p-going direction), down to zero transverse momentum (p(T)). The J/<psi> and psi (2S) production cross sections are evaluated as a function of the collision centrality, estimated through the energy deposited in the zero degree calorimeter located in the Pb-going direction. The p(T)-differential J/psi production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average < p(T)> and <pT2> values. The nuclear effects affecting the production of both charmonium states are studied using the nuclear modification factor. In the p-going direction, a suppression of the production of both charmonium states is observed, which seems to increase from peripheral to central collisions. In the Pb-going direction, however, the centrality dependence is different for the two states: the nuclear modification factor of the J/psi increases from below unity in peripheral collisions to above unity in central collisions, while for the psi (2S) it stays below or consistent with unity for all centralities with no significant centrality dependence. The results are compared with measurements in p-Pb collisions at root sNN = 5.02 TeV and no significant dependence on the energy of the collision is observed. Finally, the results are compared with theoretical models implementing various nuclear matter effects.

Název v anglickém jazyce

Centrality dependence of J/psi and psi(2S) production and nuclear modification in p-Pb collisions at root s(NN)=8.16 TeV

Popis výsledku anglicky

The inclusive production of the J/ and psi (2S) charmonium states is studied as a function of centrality in p-Pb collisions at a centre-of-mass energy per nucleon pair at root s NN = 8.16 TeV at the LHC. The measurement is performed in the dimuon decay channel with the ALICE apparatus in the centre-of-mass rapidity intervals -4.46 < y(cms)< -2.96 (Pb-going direction) and 2.03 < y(cms)< 3.53 (p-going direction), down to zero transverse momentum (p(T)). The J/<psi> and psi (2S) production cross sections are evaluated as a function of the collision centrality, estimated through the energy deposited in the zero degree calorimeter located in the Pb-going direction. The p(T)-differential J/psi production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average < p(T)> and <pT2> values. The nuclear effects affecting the production of both charmonium states are studied using the nuclear modification factor. In the p-going direction, a suppression of the production of both charmonium states is observed, which seems to increase from peripheral to central collisions. In the Pb-going direction, however, the centrality dependence is different for the two states: the nuclear modification factor of the J/psi increases from below unity in peripheral collisions to above unity in central collisions, while for the psi (2S) it stays below or consistent with unity for all centralities with no significant centrality dependence. The results are compared with measurements in p-Pb collisions at root sNN = 5.02 TeV and no significant dependence on the energy of the collision is observed. Finally, the results are compared with theoretical models implementing various nuclear matter effects.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

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

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

2021

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

36

Strana od-do

2

Kód UT WoS článku

000616628000002

EID výsledku v databázi Scopus

2-s2.0-85100380531