Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F18%3A00496794" target="_blank" >RIV/61389005:_____/18:00496794 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/18:00496794 RIV/68407700:21340/18:00328333

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.physletb.2018.06.042" target="_blank" >http://dx.doi.org/10.1016/j.physletb.2018.06.042</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2018.06.042" target="_blank" >10.1016/j.physletb.2018.06.042</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV

Popis výsledku v původním jazyce

Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum k(T) for different collision centralities in Pb-Pb collisions at root(NN)-N-S = 2.76TeV. We find that the R-side and R-out radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washedout at freeze out.

Název v anglickém jazyce

Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV

Popis výsledku anglicky

Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum k(T) for different collision centralities in Pb-Pb collisions at root(NN)-N-S = 2.76TeV. We find that the R-side and R-out radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washedout at freeze out.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

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

—

Svazek periodika

785

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

320-331

Kód UT WoS článku

000447424000047

EID výsledku v databázi Scopus

2-s2.0-85053804355