Conveners
Parallel Small systems: 1
- Marek Gazdzicki (Johann-Wolfgang-Goethe Univ. (DE))
Parallel Small systems: 2
- Thomas Peitzmann (Nikhef National institute for subatomic physics (NL))
Description
Parallel session small systems
One of the most exciting and puzzling observations in ultrarelativistic
p+A reactions is the fairly large harmonic flow (such as v2(pT) and
v3(pT) coefficients). On one hand, the flow seems to be consistent with
hydrodynamic simulations [1], suggesting a high degree of thermalization
even in such very small collision systems. On the other hand, several
non-thermal mechanisms can also...
The measurement of $\Sigma$ hyperons is rather difficult because of their abundant decay into neutral particles.
For this reason, data are available only for few energy points in pp, pA and AA collisions, in particular, the energy gap between 2 and 4 GeV
remains unexplored. Also, since $\Sigma$ hypernuclei have not been measured so far, nothing is known quantitatively from experiments
about...
Quarkonia are mesons formed of either a charm and anti-charm quark pair ($\rm{J}/\psi$, $\psi(2S)$), or a beauty and anti-beauty quark pair ($\Upsilon$(1S), (2S) and (3S)). In high-energy hadronic collisions such as those delivered by the LHC between 2010 and 2016, quarkonium production results from the hard scattering of two gluons in a process which occurs very early in the collision...
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 for pp collisions. The newest measurement...
Two-particle correlations as a function of $\Delta\eta$ and $\Delta\varphi$ are used in all collision systems to study a wide range of physical phenomena. Examples include the collective behaviour of the QGP medium, jets, quantum statistics or Coulomb effects, conservation laws, and resonance decays.
In this talk, we report measurements of the correlations of identified particles and their...
The study of energy and multiplicity dependence of hadron production in proton-proton (pp) collisions provides a powerful tool to understand similarities and differences between small and large colliding systems. In this talk we present new mid-rapidity measurements of the $p_\mathrm{T}$ distributions and yields of unidentified charged hadrons as well as of pions, kaons, protons, K$^{0}_{\rm...
Azimuthal anisotropies such as the elliptic flow $v_2$ are important tools for the study of the properties of the quark-gluon plasma (QGP). Recent studies with parton transport models suggest [1,2] that most parton $v_2$ comes from the anisotropic escape of partons, not from the hydrodynamic flow, even for semi-central Au+Au collisions at $\sqrt {s_{NN}}=200$ GeV. In this talk we will study...
We study subthreshold \Xi production in p+A collisions using a BUU type transport code. We propose new \Xi creation mechanisms in two-step processes via hyperon-nucleon collisions. Our calcultions are compared with results by the HADES (GSI, Darmstadt) experiment.
Studies of particle yields and azimuthal correlations for inclusive and identified charged particles are presented in small collision systems of pp and pPb at the LHC with the CMS detector. Charged pions, kaons, and protons are identified via their energy loss in the CMS silicon tracker. The pT spectra and integrated yields are studied as a function of multiplicity and center-of-mass energies....
