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Title: Azimuthally differential pion femtoscopy relative to the second and third harmonic in Pb–Pb 2.76 TeV collision from ALICE

Abstract

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 modulations relative to the second harmonic event plane reflect mostly the spatial geometry of the source, the third harmonic results are mostly defined by the velocity fields. Radii variations with respect to the third harmonic event plane unambiguously signal a collective expansion and anisotropy in the flow fields. Event shape engineering (ESE) is a technique proposed to select events corresponding to a particular shape. Azimuthally differential HBT combined with ESE allows for a detailed analysis of the relation between initial geometry, anisotropic flow and the deformation of source shape. We present azimuthally differential pion femtoscopy with respect to second and third harmonic event planes as a function of the pion transverse momentum for different collision centralities in Pb–Pb collisions at $$\sqrt{S_{NN}}$$ = 2.76 TeV. All these results are compared to existing models. Thus, the effects of the selection of the events with high elliptic or triangular flow are also presented.

Authors:
 [1]
  1. Wayne State Univ., Detroit, MI (United States)
Publication Date:
Research Org.:
Wayne State Univ., Detroit, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
[ALICE Collaboration]
OSTI Identifier:
1501346
Grant/Contract Number:  
[FG02-92ER40713]
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
[ Journal Volume: 967; Journal Issue: C]; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; LHC; ALICE; HBT; femtoscopy; final eccentricity; elliptic shape; freeze-out; Azimuthally differential

Citation Formats

Saleh, Mohammad. Azimuthally differential pion femtoscopy relative to the second and third harmonic in Pb–Pb 2.76 TeV collision from ALICE. United States: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2017.07.011.
Saleh, Mohammad. Azimuthally differential pion femtoscopy relative to the second and third harmonic in Pb–Pb 2.76 TeV collision from ALICE. United States. doi:10.1016/j.nuclphysa.2017.07.011.
Saleh, Mohammad. Mon . "Azimuthally differential pion femtoscopy relative to the second and third harmonic in Pb–Pb 2.76 TeV collision from ALICE". United States. doi:10.1016/j.nuclphysa.2017.07.011. https://www.osti.gov/servlets/purl/1501346.
@article{osti_1501346,
title = {Azimuthally differential pion femtoscopy relative to the second and third harmonic in Pb–Pb 2.76 TeV collision from ALICE},
author = {Saleh, Mohammad},
abstractNote = {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 modulations relative to the second harmonic event plane reflect mostly the spatial geometry of the source, the third harmonic results are mostly defined by the velocity fields. Radii variations with respect to the third harmonic event plane unambiguously signal a collective expansion and anisotropy in the flow fields. Event shape engineering (ESE) is a technique proposed to select events corresponding to a particular shape. Azimuthally differential HBT combined with ESE allows for a detailed analysis of the relation between initial geometry, anisotropic flow and the deformation of source shape. We present azimuthally differential pion femtoscopy with respect to second and third harmonic event planes as a function of the pion transverse momentum for different collision centralities in Pb–Pb collisions at $\sqrt{S_{NN}}$ = 2.76 TeV. All these results are compared to existing models. Thus, the effects of the selection of the events with high elliptic or triangular flow are also presented.},
doi = {10.1016/j.nuclphysa.2017.07.011},
journal = {Nuclear Physics. A},
number = [C],
volume = [967],
place = {United States},
year = {2017},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
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Figures / Tables:

Fig. 1. Fig. 1. : Amplitudes of the relative radius oscillationsmore » $R$$^2_{out,2}$/$R$$^2_{side,0}$, $R$$^2_{side,2}$/$R$$^2_{side,0}$,$R$$^2_{long,2}$/$R$$^2_{long,0}$, and $R$$^2_{os,2}$/$R$$^2_{ side,0}$ versus centrality for four $k$T ranges. The error bars indicate the statistical uncertainties and the square brackets show the systematic errors. The STAR data points, for 0–5%, 5–10%, 10–20%, 20–30% and 30–80% Au–Au collisions [9], are slightly shifted for clarity.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.