# Collective effects in small collisions systems

June 15, 2017
CERN
Europe/Zurich timezone
There is a live webcast for this event.

## Two-particle angular correlations studies in pPb and pp in LHCb

Jun 15, 2017, 8:40 AM
25m
4/3-006 - TH Conference Room (CERN)

24
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### Speaker

Renata Kopecna (Ruprecht-Karls-Universitaet Heidelberg (DE))

### Description

Two-particle angular correlations are studied in proton-proton collisions at $\sqrt{s}$ =13TeV, collected with the LHCb detector at the LHC. LHCb detecor provides measurement in the very forward region, 2 < η < 5. This region is complementary to other experiments and allows to explore low Bjorken-x region. A dedicated trigger to study the highest-activity events was used. A total of about 180 million minimum-bias events and 48 million high-acitvity events were used in this analysis.
The two-dimensional correlation function is studied as a function of dif- ference in pseudorapidity (∆η) and azimuthal angle (∆φ). The study was done for four different activity classes and four $p_{\rm T}$ classes. In high-activity events an enhancement is observed in the long range near side region, 2 < ∆η < 2.5,∆φ∼0.