Sirunyan, A. M.Tumasyan, A.Adam, W.Ambrogi, F.Asilar, E.Bergauer, T.Brandstetter, J.2025-03-232025-03-2320180031-90071079-7114https://doi.org/10.1103/PhysRevLett.121.082301https://hdl.handle.net/11486/5524The elliptic azimuthal anisotropy coefficient (upsilon(2)) is measured for charm (D-0) and strange (K-S(0), Lambda, Xi(-), and Omega(-)) hadrons, using a data sample of p + Pb collisions collected by the CMS experiment, at a nucleonnucleon center-of- mass energy of root(NN)-N-s = 8.16 TeV. A significant positive upsilon(2) signal from long- range azimuthal correlations is observed for all particle species in high- multiplicity p + Pb collisions. The measurement represents the first observation of possible long-range collectivity for open heavy flavor hadrons in small systems. The results suggest that charm quarks have a smaller upsilon(2) than the lighter quarks, probably reflecting a weaker collective behavior. This effect is not seen in the larger PbPb collision system at root(NN)-N-s = 5.02 TeV, also presented.eninfo:eu-repo/semantics/openAccessRelativistic Nuclear CollisionsRange Angular-CorrelationsLong-Range2-Particle CorrelationsSidePpbCollectivityArticle121810.1103/PhysRevLett.121.082301301926012-s2.0-85052837614Q1WOS:000442348000004Q1