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June 15, 2017
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Recent ATLAS measurements of azimuthal anisotropies in pp and p+Pb collisions

Jun 15, 2017, 9:30 AM
4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room


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Soumya Mohapatra (Columbia University (US))


The azimuthal anisotropies of particle yields observed in relativistic heavy-ion collisions have been traditionally considered as a strong evidence of the formation on a deconfined quark-gluon plasma produced in these collisions. However multiple recent measurements from the ATLAS Collaboration in $pp$ and $p$+Pb systems show similar features as those observed in A+A collisions, indicating the possibility of the production of such a deconfined medium in smaller collision systems. This talk presents a comprehensive summary of these ATLAS measurements in $pp$ collisions at 2.76, 5.02 and 13 TeV and in $p$+Pb collisions at 5.02 and 8.16 TeV. It includes measurements of two-particle hadron-hadron and muon-hadron correlations in $\Delta\phi$ and $\Delta\eta$, with a template fitting procedure used to subtract the dijet contributions. Measurements of multi-particle cumulants $c_n\{2$--$8\}$ are alsopresented. The cumulant measurements confirm presence of collectivephenomena in $p$+Pb collisions, but are biased by non-flow correlations and are not able to provide evidence for collectivity in $pp$ collisions. To address this, measurements from a new sub-event cumulant method that suppresses the contribution of non-flow effects are presented.

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