Long-range two-particle correlations with K0s and Lambda in pPb and PbPb collisions in CMS

20 May 2014, 16:30
spectrum (darmstadtium)



Board: I-10
Poster Correlations and Fluctuations Poster session


Zhenyu Chen (Rice University (US))


Measurements of two-particle correlations with identified K^0_s and Lambda trigger particles in 5.02 TeV pPb and 2.76 TeV PbPb collisions are presented. One unique feature of this analysis is the implementation of a high-multiplicity trigger during the 2013 LHC pPb run, which enables the correlation studies to be performed up to a multiplicity range that is comparable to mid-central PbPb collisions at 2.76 TeV. Performance of the K^0_s and Lambdas reconstruction at CMS is presented. The second-order (v_2) and third-order (v_3) anisotropy harmonics of K^0_s and Lambda are extracted from long-range correlations as a function of particle multiplicity and pT. The wide pT coverage and rich sample of high multiplicity pPb events allow: (1) a precise examination of the mass ordering effect of v_n at low pT as predicted by hydrodynamics for a collectively expanding medium; (2) exploration of possible constituent quark number scaling of v_2 and v_3 between mesons and baryons as was observed in high-energy nucleus-nucleus collisions.
On behalf of collaboration: CMS

Primary author

Zhenyu Chen (Rice University (US))

Presentation Materials