Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb-Pb collisions at √sNN=5.02 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00603294" target="_blank" >RIV/68378271:_____/24:00603294 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/24:00603294

Výsledek na webu

<a href="https://doi.org/10.1016/j.physletb.2024.139017" target="_blank" >https://doi.org/10.1016/j.physletb.2024.139017</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2024.139017" target="_blank" >10.1016/j.physletb.2024.139017</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb-Pb collisions at √sNN=5.02 TeV

Popis výsledku v původním jazyce

This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced rho(0) mesons. The rho(0) mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos(2 phi) modulation, where phi is the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb-Pb collisions at a center-of-mass energy of root s(NN) = 5.02 TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the cos(2 phi) modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos(2 phi) anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.

Název v anglickém jazyce

Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb-Pb collisions at √sNN=5.02 TeV

Popis výsledku anglicky

This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced rho(0) mesons. The rho(0) mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos(2 phi) modulation, where phi is the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb-Pb collisions at a center-of-mass energy of root s(NN) = 5.02 TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the cos(2 phi) modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos(2 phi) anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.

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/GA23-07499S" target="_blank" >GA23-07499S: Studium kvark-gluonového plazmatu pomocí tvrdých sond a podmínek jeho vzniku</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Svazek periodika

858

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

139017

Kód UT WoS článku

001373599700001

EID výsledku v databázi Scopus

2-s2.0-85204389624