Speaker
Description
Measurements of two-particle correlations in $pp$ collisions show the presence of long-range correlations along $\Delta\eta$ that are strikingly similar to those seen in heavy-ion collisions. In heavy-ion collisions, the long-range correlations are known to arise from the collective dynamics of the produced quark-gluon plasma (QGP). The similarity between the $pp$ and heavy-ion measurements raises the possibility that a tiny droplet of the QGP is produced even in $pp$ collisions. However, models that attribute the origin of these correlations to semi-hard processes can also qualitatively reproduce the features observed in earlier measurements. Recently, multiple measurements have been performed that aim to further investigate the origin of these features in $pp$ collisions. This talk presents an overview of these recent measurements. These include measurements that study the dependence of the correlations on the presence of a hard process in the event, such as a high-$p_{\mathrm{T}}$ jet or a $Z$-boson. Studies of the long-range correlations where one of the particles in the pair is a muon produced from the decay of a heavy-flavor quark are discussed. Finally, correlation measurements with an active rejection of particles associated with semi-hard processes, such as low-pT jets, are also discussed. These measurements can give further insight into the origin of the long-range correlations observed in $pp$ collisions.
| Preferred track | High-temperature QCD |
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