Conveners
Parallel Session 1.2: QCD in Small Systems (I)
- Peter Braun-Munzinger (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
We report measurement of the semi-inclusive distribution of charged-particle jets recoiling from a high transverse momentum ($p_{T}$) hadron trigger, for p--Pb collisions at $\sqrt{s_{NN}} =5.02$ TeV that have been classified by event activity. This coincidence observable is calculable perturbatively in vacuum, and has previously been measured in pp and Pb--Pb collisions at the LHC, providing...
The formation of a QGP in heavy ion collisions and the hydrodynamic expansion of the created medium are well established and reasonably well understood. This state of nuclear matter was not expected to be found in reactions involving smaller systems, such as the pA and pp collisions. Nevertheless, a wealth of experimental evidence in recent years has suggested the presence of collective...
Two-particle correlations in relative azimuthal angle ($\Delta\phi$) and pseudorapidity ($\Delta\eta$) have been used to study heavy-ion collision dynamics, including medium-induced jet modification. These correlations have been extensively studied in small collision systems by all the four main LHC experiments. Further investigations showed also the importance of Multiple Parton Interactions...
The availability at the LHC of the largest collision energy in pp collisions
allows a significant advance in the measurement of J/$\psi$ production as function
of event multiplicity. The interesting relative increase observed with data
at the LHC at $\sqrt{s}=7$ TeV and at RHIC at $\sqrt{s}=200$ GeV is studied now
at unprecedented multiplicities at $\sqrt{s}=13$ TeV.
The new measurement,...
The study of identified particle production as a function of the proton-proton (pp) collision energy and multiplicity
is a key tool for understanding similarities and differences between small and large interacting systems.
We report on the production of pions, kaons, protons, K$^{0}_{\rm S}$, $\Lambda$, $\Xi$, $\Omega$, K$^{*0}$ and $\phi$ measured in pp collisions for $\sqrt{s}$ ranging...
