EPJ Web Conf.
Volume 141, 2017XLVI International Symposium on Multiparticle Dynamics (ISMD 2016)
|Number of page(s)||5|
|Section||Multi-particle correlations and fluctuations: from small to large systems|
|Published online||12 April 2017|
Femtoscopy in √SNN = 5.02 TeV p-Pb collisions with ATLAS
Columbia University, 116th St & Broadway, New York, NY 10027, USA
a e-mail: email@example.com
Published online: 12 April 2017
Bose-Einstein correlations between identified charged pions are measured for p+Pb collisions at √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 detector. Two-particle correlation functions and the extracted source radii are presented as a function of average transverse pair momentum (kT) and rapidity (yππ*) as well as collision centrality. Pairs are selected with a rapidity −2 < yππ* < 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 scaling of the extracted radii with the mean number of participants is also used to compare a selection of initial-geometry models. The cross term Ro1, which couples radial and longitudinal expansion, is measured as a function of rapidity, and a departure from zero is observed with 4.8 σ combined significance for yππ* > −1 in the most central events.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.