Conveners
WG3: High multiplicities and small systems
- Simone Amoroso (DESY)
- Grigorios Chachamis (LIP)
WG3: High multiplicities and small systems
- Simone Amoroso (DESY)
- Grigorios Chachamis (LIP)
WG3: High multiplicities and small systems
- Simone Amoroso (DESY)
- Grigorios Chachamis (LIP)
WG3: High multiplicities and small systems: summary and discussion
- Grigorios Chachamis (LIP)
- Simone Amoroso (DESY)
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Debasish Das (Saha Institute of Nuclear Physics)12/10/2021, 11:00WG3: High Multiplicities (small systems)
Briefly after the Big Bang, the early universe was in a high temperature and high density environment. In order to recreate this state of matter in the laboratory, mini bangs are created by colliding heavy ions at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory and subsequently at the Large Hadron Collider (LHC) at CERN. In this talk I shall be covering on the...
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Marek Bombara (Pavol Jozef Šafárik University)12/10/2021, 11:20WG3: High Multiplicities (small systems)
The results from the ALICE pp and p-Pb program show intriguing trends resembling those of nucleus-nucleus collisions usually attributed to quark-gluon plasma formation. One of these measured effects is enhanced production of (multi-)strange particles with respect to pions (a.k.a. the strangeness enhancement) gradually rising from low-multiplicity to high-multiplicity pp or p-Pb collisions...
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Ran Segev12/10/2021, 11:40WG3: High Multiplicities (small systems)
We study the inuence of quantum interference and colour flow on three point correlations described by asymmetric cumulants in high multiplicity events in pp collisions. We use the model previously developed for the study of the collectivity in symmetric cumulants. We show that the resulting three point asymmetric cumulant is in qualitative agreement with the experimental data for the same...
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Dhevan Gangadharan12/10/2021, 14:30
Collective behaviour of final-state hadrons is studied in ep scattering using the H1 and ZEUS detectors at HERA. Measurements of two- and four-particle azimuthal correlations in both DIS and photoproduction are presented. Ridge yields are extracted from fits to two-particle correlations with H1 data. Comparisons of the magnitudes and signs of the first- and second-harmonic of two-particle...
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Alex Kovner (University of Connecticut)12/10/2021, 15:00
I discuss the physical origin of collective like signals in collisions of small systems from the perspective of initial state structure. Recent theoretical developments and directions of CGC inspired research are described.
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Julia Velkovska (Vanderbilt University)12/10/2021, 15:45WG3: High Multiplicities (small systems)
The quark-gluon plasma (QGP) produced in ultra-relativistic collisions between large nuclei, such as gold or lead has vanishingly small specific viscosity making it one of the most “perfect” liquids known. Experimentally, the near-perfect liquid manifests itself in a collective flow of the produced particles, and measurements of the collective flow patterns have been a key to extracting the...
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Jasper Parkkila (University of Jyväskylä)12/10/2021, 16:10WG3: High Multiplicities (small systems)
In this talk, we present the latest results on two-particle correlations in high-multiplicity pp events from the ALICE Collaboration. In addition to the traditional long-range ridge studies, we present a new differential study in high-multiplicity pp collisions which contain a high-momentum charged particle or reconstructed jet, in order to determine whether long-range correlations are...
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Mike Sas (Yale)12/10/2021, 16:30WG3: High Multiplicities (small systems)
Event-shape observables such as transverse sphericity are widely being used by the particle and nuclear physics community to characterize events and study the underlying physics mechanisms.
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In earlier studies these observables proved useful in e+e- collisions to discriminate between di-jet and multi-jet topologies, and more recently were exploited in pp collisions.
However, by using events... -
Bronislav Zakharov (L.D. Landau Institute for Theoretical Physics)12/10/2021, 16:50WG3: High Multiplicities (small systems)
We discuss recent results on possible jet quenching in collisions of small
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systems: in $pp$, $pA$ and oxygen-oxygen collisions. Calculations of the radiative and collisional parton energy loss are performed for the temperature dependent running QCD coupling. We use parametrization of $\alpha_s(Q,T)$ which has a plateau around $Q \sim \kappa T$ (it is motivated by the lattice calculation of... -
Soumya MOHAPATRA (Columbia University)12/10/2021, 17:15
This talk presents an overview of recent measurements from the ATLAS and CMS collaborations that study collective behavior in $p$+Pb and $pp$ collisions.For $p$+Pb collisions, measurements of collective behavior involving strange, charm and bottom hadrons are presented. Measurements of elliptic anisotropy in Ultra-peripheral $p$+Pb collisions, which are
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in fact $p$+$\gamma$ collisions, are... -
Grigorios Chachamis (LIP), Simone Amoroso (DESY)15/10/2021, 15:45
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Debasish Das (Saha Institute of Nuclear Physics)