SnowMass2021

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====== EF06: QCD and strong interactions: Hadronic structure and forward QCD ======
  * co-Conveners: Pavel Nadolsky, Huey-Wen Lin, Christophe Royon
  *   Please join our email list, <SNOWMASS-EF-06-HAD_FWD_QCD@FNAL.GOV>, to follow the Topical Group Activities!
       *   For instructions how to join, refer to [[https://snowmass21.org/energy/start#communications| Energy Frontier/Communications]]
  * [[ https://indico.fnal.gov/category/1140/ | Agendas ]] and presentation materials of EF06 weekly community meetings
  *  [[https://calendar.google.com/calendar/embed?src=brown.edu_njuueqjsrlu8qgdulatqrrmtj4%40group.calendar.google.com&ctz=America%2FChicago | Calendar]] of weekly meetings and other activities

~~NOCACHE~~
===== Description=====
This topical group covers the following topics:  hadronic structure, parton distribution functions (collinear, spin-dependent, nuclear, TMDs, GPDs, ...), QCD in forward regions and at small momentum fractions, diffractive processes, future experiments to probe hadron structure, hadron spectroscopy and exotic hadronic states at hadron colliders
===== Focused questions studied by the EF06 Topical Group=====
  - What is the best approach to reduce systematic uncertainties in LHC measurements to achieve the accuracy of PDFs envisioned by electroweak precision studies at the high-luminosity LHC?
  - What is the feasible strategy for obtaining accurate PDFs for N3LO QCD computations? Which theoretical advances and computational tools will be necessary?
  - What is the potential of new deep inelastic scattering facilities (Electron-Ion Collider and Large Hadron-Electron collider) for probing the hadronic and nuclear structure in the regions relevant for HEP experiments? How can the experience of the HEP community be transferred to enhance the potential of the EIC and LHeC studies?
  - How does the knowledge of hadron structure affect measurements of the QCD coupling constant in various processes?  
  - When do power-suppressed contributions to the hadron structure become important in NXLO QCD calculations? What are the best approaches to predict or measure them? 
  - What are the best observables to look for low-x resummation effects predicted by the Balitsky-Fadin-Kuraev-Lipatov resummations? Define less inclusive variables compared to pure Mueller Navelet jets, and compute predictions on jet gap jet observables at NLO.
  - What are the prospects of running forward proton detectors at the LHC at high luminosity? What will be their sensitivity to anomalous couplings between photon, W, Z bosons, top quarks…
  - How to observe saturation effects or high-gluon density regimes at the LHC and the EIC? 
  - Which diffractive measurements can be performed at the LHC and the EIC in order to understand better the structure of the Pomeron?
  - Which detectors (including acceptance/resolution) will be needed at the LHC and the EIC in order to perform the best possible measurements of energy, particle production in the very forward region?
  - How can the LHC, LHeC, and FCC improve our knowledge of the 3-dimensional structure of nucleons and nuclei?
  - How do excited hadronic states with two or more heavy quarks form and decay?
  - What are the BSM connections for hadron spectroscopy at future facilities? 
  - How will artificial intelligence methods advance extraction of nonperturbative hadronic functions from experimental measurements? 



===== Submitted LOI =====
[[https://smu.box.com/s/aslbob08ayyiwpaozku3likl68jvpoz9|LOI's submitted or pertinent to EF06, in one Adobe PDF file]] (updated on 2020-09-09)

 [[https://www.snowmass21.org/docs/files/?dir=summaries/EF| Letters of Intent submitted to Energy Frontier (as primary frontier)]], on the server. 

Here is the list of submitted LOIs that include EF as primary or secondary topic. 
 First index before "/"  corresponds to the primary frontier used for the submission.

 {{url>https://www.snowmass21.org/docs/files/list.php?frontier=EF6  border 100%,1200px}}