Abstract
Recent measurements in two-particle correlations in p+Pb collisions suggest collective behavior reminiscent of that observed in Pb+Pb. Femtoscopic measurements may provide useful insight on this behavior because they image the spatio-temporal size of the particle emitting region. This proceeding presents identical-pion Hanbury Brown and Twiss (HBT) measurements from ATLAS using one- and three-dimensional correlation functions. Pions are identified using dE/dx measured in the pixel detector. Correlation functions and the resulting HBT radii are shown as a function of pair momentum (kT) and collision centrality.
Highlights
Long range two-particle correlation functions in relative pseudorapidity and relative azimuthal angle in pp and p+Pb collisions measured at the LHC are consistent with a possible collective behaviour [1, 2, 3], reminiscent to that observed in Pb+Pb collisions, see e.g. [4]
Femtoscopic measurements in pp and p+Pb collisions [5, 6] allow the investigation of the time evolution of small colliding systems. dependence of same- and
The coordinates are defined in the Bertsch-Pratt convention [10, 11], where qout shows in the direction of the pair momentum, qlong shows in the direction of the beam and qside is perpendicular to the qout and qlong
Summary
Long range two-particle correlation functions in relative pseudorapidity and relative azimuthal angle in pp and p+Pb collisions measured at the LHC are consistent with a possible collective behaviour [1, 2, 3], reminiscent to that observed in Pb+Pb collisions, see e.g. [4]. Long range two-particle correlation functions in relative pseudorapidity and relative azimuthal angle in pp and p+Pb collisions measured at the LHC are consistent with a possible collective behaviour [1, 2, 3], reminiscent to that observed in Pb+Pb collisions, see e.g. Femtoscopic measurements in pp and p+Pb collisions [5, 6] allow the investigation of the time evolution of small colliding systems. This proceeding reports opposite-sign pion pair the first measurement correlations in p+Pb cooflltihseiocnesntartali√tysNaNnd=m5o.m02enTtuemV measured by the ATLAS experiment
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