Speaker
Description
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.
| Content type | Experiment |
|---|---|
| Collaboration | ATLAS |
| Centralised submission by Collaboration | Presenter name already specified |
