Welcome to the Honexcomb web

HonexComb is initiated thanks to the Strong 2020 initiative. The original submitted work package (WP19, JRA1, called LHC-Combine) can be found here. Extract:

We believe that the time has come to improve communication between the four collaborations in the heavy-ion field, and establish an LHC data-combination working group. These objectives can be split into two tasks: The animation of a common forum to ensure a regular communication between the four collaborations; and cross-experiment combination work, such as detailed comparisons of techniques or optimized statistical combination of results, leading to common publications. (in. Strong-2020 proposal)

Communication tools

Possible combination topics

On-going projects

  • Combining the open charm results from the four collaborations: HonexcombCharmSection (Gian-Michel Innocenti, Jiayin Sun...)

Possible subjects

At the time of the proposal, four topics were listed, then reviewed during the first meeting, identifying Possible subjects of combination:

  • Light-by-light scattering
    • Possible: Final run 2 combination of light-by-light scattering
  • Constraining nPDF
    • Possible: Would we gain in combining the lower statistics signals, e.g. Z or W bosons in the forward region from LHCb and Alice?
    • Action: discuss needs with nPDF makers
  • Heavy flavours
    • Possible: Total cross section of charm, beauty (?)
    • Possible: Pseudo-rapidty dependences
    • Possible: Baryon/meson ratio, would be nice from LHCb
    • Possible: Open beauty > LUT from the theory?
  • Quarkonia
    • Possible: Upsilons, a nice combination paper for run 3? Intriguing comparison btw ATLAS and CMS, to be followed up…

Other subjects, proposed in meetings

  • Possible: X(3872) ?
  • Possible: Jets ?
  • Possible: nPDF from UPC ?

Possible other activities


  • On-going activity about Glauber baseline
  • Action: Review the multiplicity definitions


  • Action: Popularize the top quark studies
  • Possible: Make and endorse summary plots?

Collaboration contacts

  • In ALICE: Alexander Kalweit
  • In ATLAS: Iwona Grabowska-Bold
  • In CMS: Raphael Granier de Cassagnac
  • In LHCb: Giulia Manca


  • April 2020: First report to EU, a roadmap after kicking-off...
  • Oct. 2019: Strong-2020 kick-off meeting indico, including honexcomb contribution.
  • Mar. 2018: The original submitted work package (WP19, JRA1, LHC-Combine): here.
  • Nov. 2017: early proposal: slides


This project has received funding from the European Union's horizon 2020 research and innovation programme under grant agreement no 824093, aka STRONG 2020. Logos : square, banner

Honexcomb Web Utilities

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf 2017.11.01.HONEXCOMB-Talk.pdf r1 manage 567.0 K 2020-01-28 - 12:52 RaphaelGranierDeCassagnac  
PDFpdf 2018_-_LHCCombineOnly.pdf r1 manage 93.2 K 2020-01-17 - 15:22 RaphaelGranierDeCassagnac  
PDFpdf Roadmap.pdf r1 manage 71.7 K 2020-05-26 - 14:18 RaphaelGranierDeCassagnac  
PNGpng STRONG2020-Banner.png r1 manage 76.6 K 2020-01-28 - 12:52 RaphaelGranierDeCassagnac  
PNGpng STRONG2020.png r1 manage 72.3 K 2020-01-28 - 12:52 RaphaelGranierDeCassagnac  
Edit | Attach | Watch | Print version | History: r19 < r18 < r17 < r16 < r15 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r19 - 2020-05-26 - RaphaelGranierDeCassagnac
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Honexcomb All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright &© 2008-2020 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback