Conveners
Parallel session 31: Collective dynamics & small systems III
- Hannah Elfner
The understanding of collectivity in small collision systems must address three key issues related to the initial conditions: (1) the role of nucleon and sub-nucleon fluctuations, (2) nucleon forces and emergent correlations in light ions, such as alpha clustering, and (3) the influence of longitudinal fluctuations and their impact on flow decorrelations. We present two- and four-particle...
Anisotropic flow characterizes the shape and direction of expansion of the medium created in heavy-ion collisions. The Fourier coefficients in the expansion of particle azimuthal distribution describe the collective response of the medium to the shape of the initial collision geometry,
and are sensitive to the equation of state (EOS). A non-monotonic slope in the first-order flow coefficient...
Particle correlations are powerful tools for studying quantum chromodynamics in hadron collisions. In heavy-ion collisions, azimuthal angular correlations probe collective phenomena in hot, dense, nuclear media, such as QGP. In small collision systems, they could point to final-state effects or potential initial-state correlations. The LHCb experiment has the unique ability to study particle...
Heavy quarks (i.e. charm and beauty) are powerful tools to characterize the quark-gluon plasma (QGP) produced in heavy-ion collisions. Although they are initially produced out of kinetic equilibrium via hard partonic scattering processes, recent measurements of the anisotropic flow of charmed hadrons pose the question regarding the possible thermalization of heavy quarks in the medium. By...
We find a remarkable universality in the experimentally observed transverse momentum spectra in ultrarelativistic nuclear collisions, obtained by removing the global scales of total particle number and mean transverse momentum. This scaling behavior breaks down at large transverse momentum and for very small systems, such as those produced in p-p collisions. We further demonstrate that this...
