May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Femtoscopy with identified charged pions in $p$+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV with the ATLAS detector

May 15, 2018, 5:00 PM
2h 40m
First floor and third floor (Palazzo del Casinò)

First floor and third floor

Palazzo del Casinò

Poster Collectivity in small systems Poster Session


Brian Cole (Columbia University (US))


Hanbury Brown and Twiss (HBT) radii are measured as a function of centrality, transverse momentum, rapidity, and azimuthal angle with respect to the second-order event plane in central $p$+Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV with the ATLAS detector at the LHC. A total integrated luminosity of 28 nb$^{-1}$ is sampled. The radii are presented as a function of the local density dN/dy$^\star$ and the rapidity-dependence is shown to depend directly on the density. The radii and their relative azimuthal modulation are presented as a function of the magnitude of the flow vector $|q_2|$ measured in the ATLAS calorimeters in the lead-going direction, with pseudorapidity $\eta<-2.5$. Modulations of the transverse HBT radii are observed with the same orientation as in ion--ion collisions, in which they are attributed to hydrodynamic evolution from an elliptic initial geometry. This modulation is consistent with a hydrodynamic evolution of a short-lived medium.

Centralised submission by Collaboration Presenter name already specified
Content type Experiment
Collaboration ATLAS

Primary authors

Barbara Krystyna Wosiek (Institute of Nuclear Physics Polish Academy of Sciences (PL)) Michael Ryan Clark (Columbia University (US))

Presentation materials