Name: EIC PL meetings 2024
Start: 2024-04-13T15:00:00+02:00
End: 2025-06-30T16:00:00+02:00
Location: No location set

Monday, 22 April
- 15:00 → 16:00
  
  The electron-ion collider: A collider to unravel the mysteries of visible matter 1h
  
  Understanding the properties of nuclear matter and its emergence through the underlying partonic structure and dynamics of quarks and gluons requires a new experimental facility in hadronic physics known as the Electron-Ion Collider (EIC). The EIC will address some of the most profound questions concerning the emergence of nuclear properties by precisely imaging gluons and quarks inside protons and nuclei such as their distributions in space and momentum, their role in building the nucleon spin and the properties of gluons in nuclei at high energies. The polarised EIC beams do not only allow to study the longitudinal and transverse polarized nucleon spin structure, but also to use polarization as a vehicle to access nucleon/nuclei structure difficult to study with unpolarized beams. This presentation will give highlights on the EIC science program, introduce the needed experimental equipment and describe the components of the EIC accelerator critical for the science program. The talk will end summarizing the status of the EIC project.
  
  Speaker: Elke-Caroline Aschenauer (Brookhaven National Lab )
  
  eca.EIC.Poland.Seminar.pdf
Monday, 24 June
- 13:00 → 14:00
  
  Synergies between the Electron-Ion Collider and the Large Hadron Collider experiments 1h
  
  After a brief introduction to the Electron-Ion Collider (EIC) and the Joint ECFA-NuPECC-APPEC Activity on "Synergies between the Electron-Ion Collider and the Large Hadron Collider experiments", I will go into examples of such synergies, focusing mostly on the QCD related ones: parton densities of protons and nuclei, quarkonium production, transverse momentum dependent parton distributions (TMDs) and generalized TMDs, double parton scattering and diffraction. Other synergies for electroweak and BSM studies and with astroparticle physics will also be touched upon briefly.
  
  Speaker: Daniël Boer (University of Groningen)
  
  Polish QCD community-presentation-Boer-June2024-v3.pdf
Monday, 4 November
- 15:00 → 16:00
  
  Small-x Quark and Gluon Helicity and OAM Contributions to the Proton Spin Puzzle 1h
  
  One of the fundamental questions in our understanding of the proton structure is the proton spin puzzle. Theoretically, adding all the helicities and orbital angular momenta (OAM) of the quarks and gluons in the proton should give us 1/2, the spin of the proton. At the same time, adding the experimentally measured spin carried by the quarks and gluons in the proton comes up short, presently giving us a number in the 0.3-0.4 range. This decades-old discrepancy is known as the "proton spin puzzle". In this talk we will discuss the possibility that the missing spin of the proton can be carried by quarks and gluons carrying a small fraction x of the proton momentum. This contribution is mostly beyond the reach of current experiments and is very hard to calculate numerically on the lattice. It appears that an improved theoretical understanding of quark and gluon helicity and OAM distributions at small x is needed to assess the amount of proton spin coming from this region. In this talk I will describe the work of my group to construct such a theory: I will derive the novel small-x evolution equations for helicity and solve them to find the small-x asymptotics of the quark and gluon helicity and OAM distributions. I will show how these equations can be used to obtain a first-ever fit of the world polarized DIS and SIDIS data for x<0.1 based solely on small-x helicity evolution. The resulting amount of the proton spin coming from the small-x region appears to be significant, opening a tantalizing possibility that the proton spin puzzle can be resolved by including this small-x contribution. We will conclude by describing how the upcoming Electron-Ion Collider (EIC) can further test our theoretical formalism and its predictions.
  
  Speaker: Yuri Kovchegov ( Department of Physics, The Ohio State University)