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Title: Femtoscopy in s NN = 5.02  TeV p+Pb collisions with ATLAS

Abstract

Bose-Einstein correlations between identified charged pions are measured for p+Pb collisions at $$ \sqrt{sNN}=5.02 $$ TeV with the ATLAS detector using a total integrated luminosity of 28 nb -1. Pions are identified using ionisation energy loss measured in the pixel silicon detector. Two-particle correlation functions and the extracted source radii are presented as a function of collision centrality as well as average transverse pair momentum (k T), rapidity (y* $$\pi$$$\pi$$), and azimuthal angle with respect to the second-order event plane. Pairs are selected with a rapidity -2 < y* $$\pi$$$\pi$$ <1 and with an average transverse momentum 0.1 < k T < 0.8 GeV. The effect on the two-particle correlation function from jet fragmentation is studied, and a new method for constraining its contributions to the measured correlations is described. The measured source sizes are substantially larger in more central collisions and are observed to decrease with increasing pair k T. A correlation with the local single-particle multiplicity dN ch/dy* is demonstrated. The cross term R ol, which couples radial and longitudinal expansion, is measured as a function of rapidity, and a departure from zero is observed with 5.1σ combined significance for y* $$\pi$$$\pi$$ > -1 in the most central events. Lastly, the azimuthal modulation of the radii in central events is observed to be consistent with that predicted by hydrodynamics and observed in A+A collisions.

Authors:
Publication Date:
Research Org.:
Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
ATLAS Collaboration
OSTI Identifier:
1501433
Grant/Contract Number:  
FG02-86ER40281
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; Femtoscopy; HBT; flow in small systems

Citation Formats

Clark, Michael. Femtoscopy in sNN=5.02 TeV p+Pb collisions with ATLAS. United States: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2017.06.020.
Clark, Michael. Femtoscopy in sNN=5.02 TeV p+Pb collisions with ATLAS. United States. doi:10.1016/j.nuclphysa.2017.06.020.
Clark, Michael. Mon . "Femtoscopy in sNN=5.02 TeV p+Pb collisions with ATLAS". United States. doi:10.1016/j.nuclphysa.2017.06.020. https://www.osti.gov/servlets/purl/1501433.
@article{osti_1501433,
title = {Femtoscopy in sNN=5.02 TeV p+Pb collisions with ATLAS},
author = {Clark, Michael},
abstractNote = {Bose-Einstein correlations between identified charged pions are measured for p+Pb collisions at $ \sqrt{sNN}=5.02 $ TeV with the ATLAS detector using a total integrated luminosity of 28 nb-1. Pions are identified using ionisation energy loss measured in the pixel silicon detector. Two-particle correlation functions and the extracted source radii are presented as a function of collision centrality as well as average transverse pair momentum (kT), rapidity (y*$\pi$$\pi$), and azimuthal angle with respect to the second-order event plane. Pairs are selected with a rapidity -2 < y*$\pi$$\pi$ <1 and with an average transverse momentum 0.1 < kT < 0.8 GeV. The effect on the two-particle correlation function from jet fragmentation is studied, and a new method for constraining its contributions to the measured correlations is described. The measured source sizes are substantially larger in more central collisions and are observed to decrease with increasing pair kT. A correlation with the local single-particle multiplicity dNch/dy* is demonstrated. The cross term Rol, which couples radial and longitudinal expansion, is measured as a function of rapidity, and a departure from zero is observed with 5.1σ combined significance for y*$\pi$$\pi$ > -1 in the most central events. Lastly, the azimuthal modulation of the radii in central events is observed to be consistent with that predicted by hydrodynamics and observed in A+A collisions.},
doi = {10.1016/j.nuclphysa.2017.06.020},
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:

Figure 1 Figure 1: Three-dimensional transverse HBT radii Rout and Rside as a function of the average transverse momentum kT (top) and rapidity y$^{*}_{ππ}$ (bottom) of pion pairs [11]. The widths of the boxes vary between centrality intervals only for visual clarity.

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