Abstract
Recent observation of collective effects in high-multiplicity pp and pA collisions raise the question of whether QGP can also be formed in the smaller systems. Systematic studies of the strange particle abundance and nuclear modification factors can shed light on this issue. The CMS experiment has excellent strange-particle reconstruction capabilities over a broad kinematic range in pp and pPb collisions. The spectra of and hadrons have been measured in various rapidity regions as a function of pT in pp and pPb collisions at 5.02 TeV. Based on the measurements of these spectra, nuclear modification factors of , and in mid-rapidity are measured. Since pPb is an asymmetric system, the nuclear modification factor of , and in Pb-going direction are compared to those in p-going direction. These final results for nuclear modification factors measured out to high-pT can be helpful in discussing the implications of collective behavior and energy loss. In addition, the measurement of the forward-backward rapidity yield asymmetries of and Λ as a function of pT provide sensitivity to initial state effects, such as shadowing in the nuclear parton distributions.
Highlights
Particle production in pA and dA, as compared to pp collisions has long been considered as a useful tool to understand particle production mechanism
With the measurements of these two quantities for different strange particle species, effects such as the Cronin effect [4], nuclear shadowing effect [5], radial flow effect [6] can be thoroughly studied. This talk discussed results of measurements of strange and multi-strange particles: K0S, Λ+Λ, Ξ−+Ξ+, and Ω−+Ω+ pT pPb collisions sapte√ctsrNaNat=−51.0.82 studied as a function of pT in
Raw yields of strange particles are extracted from these invariant mass peaks by integrating the signal function
Summary
Particle production in pA and dA, as compared to pp collisions has long been considered as a useful tool to understand particle production mechanism. With the measurements of these two quantities for different strange particle species, effects such as the Cronin effect [4], nuclear shadowing effect [5], radial flow effect [6] can be thoroughly studied. This talk discussed results of measurements of strange and multi-strange particles: K0S, Λ+Λ (hereafter referred to as Λ), Ξ−+Ξ+ (hereafter referred to as Ξ−), and Ω−+Ω+ (hereafter referred to as Ω−) pT pPb collisions sapte√ctsrNaNat=−51.0.82 studied as a function of pT in. The results are compared to calculations from the EPOS LHC model including collective flow in pp and pPbcollisions
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