4-10 February 2021
Europe/Zurich timezone

The goal of this 5-day workshop is to explore the community perspective on the physics opportunities of oxygen-oxygen and proton-oxygen collisions in the LHC Run 3.

The cosmic-ray community argues for a short pO run during Run 3, because this is the unique time-window for LHCf to take data. In the heavy-ion community, the origin of collectivity in small collision systems remains a central question that begs a timely answer. A more formalised exchange between LHC experiments and theory is clearly an advantage for a successful pO and OO run. Through this workshop, we aim to bring together theorists and experimentalists to discuss both the physics opportunities and challenges specific to OO and pO.

The workshop will provide time for creative discussions on unique opportunities from collisions of light ions. A short summary document of the main conclusions of the workshop will be prepared in advance of the LHCC meeting in March 2021.


  • Initial state
  • Soft dynamics of small systems
  • Hard probes in OO and pO
  • Experimental opportunities with OO and pO
  • Light-ion beams at the LHC (machine development)
  • pO for cosmic-ray physics

Confirmed speakers:

  • Reyes Alemany Fernandez (CERN)
  • Roderik Bruce (CERN)
  • Martino Gagliardi (Universita di Torino)
  • Wojciech Broniowski (IFJ PAN & UJK)
  • Soeren Schlichting (Universität Bielefeld)
  • Wenbin Zhao (Peking University)
  • Chun Shen (Wayne State University)
  • Harri Niemi (University of Jyväskylä)
  • Govert Nijs (MIT)
  • Yuuka Kanakubo (Sophia University)
  • Jacquelyn Noronha-Hostler (University of Illinois at Urbana-Champaign)
  • Petja Paakkinen (Universidade de Santiago de Compostela)
  • Alexander Huss (CERN)
  • Liliana Apolinário (LIP)
  • Anne Marie Sickles (ATLAS, Univ. Illinois at Urbana Champaign)
  • Hans Dembinski (LHCb, MPI Heidelberg)
  • Giacomo Graziani (LHCb/SMOG, INFN Firenze)
  • Tanguy Pierog (KIT, IAP)
  • Dennis Perepelitsa (sPHENIX, UC Boulder)
  • Wei Li (STAR, Rice University)
  • Christian Bierlich (Lund University)

The workshop will take place over five days with a weekend break in the middle: Feb 4-5 and Feb 8-10. Four to five talks each day are scheduled in the late afternoon Geneva time to accommodate different time zones. Each day will be concluded with an extended discussion session to allow an in-depth analysis on the unique opportunities of OO and pO collisions at the LHC.

All talks will be held virtually on Zoom (registration is mandatory to access the links).

Registration for this event is currently open.