The VII-th International Conference on the Initial Stages of High-Energy Nuclear Collisions : Initial Stages 2023

Session

Parallel Session 8

Jun 21, 2023, 4:10 PM

Copenhagen

Conveners

Parallel Session 8

• Debojit Sarkar (Niels Bohr Institute, University of Copenhagen, Denmark)

61. Search for QCD collectivity inside high-multiplicity jets in pp collisions with the CMS experiment

Parker Gardner (Rice University (US))

6/21/23, 4:10 PM

Collective dynamics from small to large systems

Oral

It has been postulated that nonperturbative quantum chromodynamics (QCD) evolution of a single parton in the vacuum can develop long-range collective effects of a multiparton system, reminiscent of those observed in high-energy nuclear interactions from the formation of a quark-gluon plasma. A search for such QCD collective effects is performed by the CMS experiment via two-particle...

46. Collectivity in small and large systems with heavy-flavour observables with ALICE

Stefano Trogolo (University of Houston (US))

6/21/23, 4:30 PM

Collective dynamics from small to large systems

Oral

The evidence for correlations between particles significantly separated in pseudorapidity in both small and large colliding systems represents one of the most remarkable findings observed at the LHC and at RHIC. Long-range correlations in heavy-ion collisions are considered signatures for the creation of a strongly-coupled quark-gluon plasma, which converts the initial anisotropy of the...

185. Measurement of the Sensitivity of Two-Particle Correlations in $pp$ Collisions to the Presence of Hard Scatterings

Pengqi Yin (Columbia University (US))

6/21/23, 4:50 PM

Collective dynamics from small to large systems

Oral

Measurements of two-particle correlations in $pp$ collisions show the presence of long-range correlations along $\Delta\eta$ that are similar to those seen in heavy-ion collisions. The similarity between the $pp$ and heavy-ion measurements raises the possibility that a tiny droplet of the QGP is produced even in $pp$ collisions. However, alternative models that attribute the correlations in...

139. Non-Hydrodynamic Modes from Linear Response in Kinetic Theory

Stephan Ochsenfeld (Bielefeld University)

6/21/23, 5:10 PM

New theoretical techniques at large and small coupling

Oral

Viscous hydrodynamics serves as a successful mesoscopic description of the quark-gluon plasma produced in relativistic heavy-ion collisions. In order to investigate, how such an effective description emerges from the underlying microscopic dynamics we calculate the non-hydrodynamic and hydrodynamic modes of linear response in the sound channel from a first-principle calculation in kinetic...

95. Deep learning for flow observables in ultrarelativistic heavy-ion collisions

Henry Hirvonen (University of Jyväskylä)

6/21/23, 5:30 PM

New theoretical techniques at large and small coupling

Oral

We train a deep convolutional neural network to predict hydrodynamic results for flow coefficients, average transverse momenta and charged particle multiplicities in ultrarelativistic heavy-ion collisions from the initial energy density profiles [1]. We show that the neural network can be trained accurately enough so that it can reliably predict the hydrodynamic results for the flow...

114. Does quark-gluon plasma feature an extended hydrodynamic regime?

Dr Yi Yin (Institute of modern physics, Chinese Academy of Sciencessti)

6/21/23, 5:50 PM

Collective dynamics from small to large systems

Oral

In the view that the short wavelength response can be important in small colliding systems and at early-times of a heavy-ion collision, we investigate the response of the near-equilibrium quark-gluon plasma (QGP) to perturbation at non-hydrodynamic gradients. We propose a conceivable scenario under which sound mode continues to dominate the medium response in this regime. Such a scenario has...