Probing novel long-range correlation phenomena in pPb collisions with identified particles at CMS

Observation of a long-range near-side two-particle correlation (known as the "Ridge") in high-multiplicity pp and pPb collisions opened up new opportunities of exploring novel QCD dynamics in small collision systems. To further investigate the origin of this phenomenon, studies of two-particle correlations with identified K⁰_s and $\Lambda /\overline{\Lambda }$ trigger particles in 5.02 TeV pPb collisions are presented, and compared to PbPb collisions over a similar multiplicity range. The K⁰_s and $\Lambda /\overline{\Lambda }$ are cleanly reconstructed via their secondary decay vertices over a wide pseudorapidity and transverse momentum range. The second-order anisotropy harmonics (v₂) of K⁰_s and $\Lambda /\overline{\Lambda }$ are extracted from long-range correlations as a function of particle multiplicity and p_T. The wide p_T coverage and rich sample of high multiplicity pPb events allow: (1) a precise examination of the mass ordering effect of v_n at low p_T as predicted by hydrodynamics for a collectively expanding medium; (2) exploration of possible constituent quark number scaling of v₂ between mesons and baryons as was observed in high-energy nucleus- nucleus collisions. (paper)