Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5494219 | Nuclear Physics A | 2016 | 4 Pages |
Abstract
We present measurements of strange hadron (Ks0, Î+Îâ¾, and Î++Îâ) transverse momentum (pT) spectra in pp, pPb, and PbPb collisions over a wide range in charge-particle multiplicity and particle rapidity. The data were taken with the CMS detector at the LHC for pp collisions at s=7Â TeV, pPb collisions at sNN=5.02Â TeV, and PbPb collisions at sNN=2.76Â TeV. We find the average transverse kinetic energy (KET) increases with event multiplicity, with a faster rate for heavier particle species. At similar multiplicities, we observe the separation in the ãKETã, which is defined as ãKETã=ãmTãâm, where mT=m2+pT2, between different particle species is larger for pp and pPb systems than PbPb system. In pPb collisions, ãKETã is found to be larger in the Pb-going direction than in the p-going direction. This trend of asymmetry becomes more evident for heavier particle species as event multiplicity increases. We also compare the data to models motivated by hydrodynamics.
Keywords
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Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Hong Ni, CMS Collaboration CMS Collaboration,