Femtoscopy with Identified Charged Pions in Proton-Lead Collisions at √{S_{NN}}=5.02 TeV with ATLAS

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Femtoscopy with Identified Charged Pions in Proton-Lead Collisions at √{S_{NN}}=5.02 TeV with ATLAS

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Title: Femtoscopy with Identified Charged Pions in Proton-Lead Collisions at √{S_{NN}}=5.02 TeV with ATLAS
Author(s):
Aaboud, M.;
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdinov, O.;
Abeloos, B.;
Aben, R.;
Izen, Joseph M.;
Meirose, Bernhard;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration;
Meirose, Bernhard;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2017-12-28
Item Type: article
Keywords: Show Keywords
Abstract: Bose-Einstein correlations between identified charged pions are measured for p+Pb collisions at √{S_{NN}} = 5.02 TeV using data recorded by the ATLAS detector at the CERN Large Hadron Collider corresponding to a total integrated luminosity of 28 nb⁻¹. Pions are identified using ionization energy loss measured in the pixel detector. Two-particle correlation functions and the extracted source radii are presented as a function of collision centrality as well as the average transverse momentum k_T and rapidity (y_{ππ}^*) of the pair. Pairs are selected with a rapidity -2 < (y_{ππ}^*) < 1 and with an average transverse momentum 0.1 < k_T < 0.8 GeV. The effect of jet fragmentation on the two-particle correlation function is studied, and a method using opposite-charge pair data to constrain 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 of the radii with the local charged-particle density is demonstrated. The scaling of the extracted radii with the mean number of participating nucleons is also used to compare a selection of initial-geometry models. The cross term R_{ol} is measured as a function of rapidity, and a nonzero value is observed with 5.1 sigma combined significance for -1 < (y_{ππ}^*) < 1 in the most central events.
Publisher: Amer Physical Soc
ISSN: 2469-9985
Source: Physical Review C
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevC.96.064908
Persistent Link: http://hdl.handle.net/10735.1/6093
Bibliographic Citation: Aaboud, M., G. Aad, B. Abbott, J. Abdallah, et al. 2017. "Femtoscopy with identified charged pions in proton-lead collisions at √{S_{NN}}=5.02 TeV with ATLAS." Physical Review C 96(6), doi:10.1103/PhysRevC.96.064908
Terms of Use: CC BY 4.0 (Attribution)
©2017 CERN, for the ATLAS Collaboration

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CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)