Recent results from CMS

Émilien Chapon,A Mischke,P Kuijer

doi:10.1051/epjconf/201817101007

Abstract

Recent results from the CMS Collaboration are reported, covering the wide variety of probes accessible to the experiment.

Highlights

The strongly interacting matter created in nuclear collisions at the LHC, in pPb and PbPb collisions and high multiplicity pp collisions, can be studied with the means of a large variety of probes, from identified hadrons to jets, from light flavours and strangeness to heavy flavours, charm and beauty
The prompt component of J/ψ meson production receives a contribution from the feed-down from excited charmonium states, χc and ψ(2S ) mesons. This cannot be separated from direct J/ψ meson production in the results reported here
The v2 measurement is found to be compatible at high pT with that of charged hadrons, dominated by light hadrons, which could be pointing to a flavour independence of this path length dependence

Summary

Charmonia

The different charmonium states (J/ψ, ψ(2S )) can be reconstructed through their decay to a pair of oppositely charged muons. In. PbPb collisions and at high pT (pT > 6.5 GeV), the creation of a QGP further suppresses J/ψ meson production, because of parton energy loss, especially at very high pT, and melting induced by Debye colour charge screening in the deconfined medium. PbPb collisions and at high pT (pT > 6.5 GeV), the creation of a QGP further suppresses J/ψ meson production, because of parton energy loss, especially at very high pT, and melting induced by Debye colour charge screening in the deconfined medium √thseNψN(=2S5).0m2eTsoeVn,.cTomhips adrieffdetroenthcee seems to be more pronounced at backward rapidity in pPb collisions, as shown, and it is observed at all pT between 3 and 30 GeV in PbPb collisions This points to the importance of final state effects, which have a different impact on the ground and excited states. The Υ(3S ) meson peripheral events [8]

Heavy flavour jets

Open heavy flavour

Collectivity

2.76 TeV Hydro