Journal
NUCLEAR PHYSICS A
Volume 982, Issue -, Pages 451-454Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2018.09.020
Keywords
anisotropic azimuthal correlations; elliptic flow; p(T)-differential; identified particles; small systems; p-Pb; ALICE; LHC
Categories
Funding
- STFC [2017 STFC Nuclear Physics CG, 1843572, ST/P004598/1, 1796881, ST/L005670/1, ST/M001598/1, ST/P005438/1] Funding Source: UKRI
- Science and Technology Facilities Council [1796881, 2017 STFC Nuclear Physics CG, ST/P004598/1, 1843572, ST/M001598/1, ST/P005438/1, ST/L005670/1] Funding Source: researchfish
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Recent observations of long-range multi-particle azimuthal correlations in p-Pb and high multiplicity pp collisions provided new insights into collision dynamics and opened a possibility to study collective effects in these small systems. New measurements of p(T)-differential elliptic flow (v(2)) coefficient for inclusive charged hadrons as well as a variety of identified particle species in p-Pb collisions at root s(NN) = 5.02 TeV are presented. The data was collected by ALICE during the LHC Run 2 data taking. Besides high precision measurements of v(2)(P-T) for pi(+/-), K-+/- and p((p) over bar), the first results for K-s(0), Lambda((Lambda) over bar) and phi are shown. In order to eliminate non-flow contamination, a pseudorapidity separation between correlated particles is applied as well as subtraction of remaining non-flow estimate based on a measurement of minimum-bias pp collisions at root s = 13 TeV. Moreover, the reported characteristic mass ordering and approximate number of constituent quarks (NCQ) and transverse kinetic energy (KET) scaling of v(2) allow to test various theoretical models, constrain the initial conditions, and probe the origin of collective behavior in small collision systems.
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