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 3 or 4 collaborations: HonexcombCharmSection (Gian-Michel Innocenti for Alice, Jiayin Sun for LHCb, Achim Geiser for CMS...)

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

Strong 2020:

This project is part of the Strong 2020 activities (http://www.strong-2020.eu). The STRONG-2020 project brings together many of the leading research groups and infrastructures involved today in the study of the strong interaction in Europe, and also exploits the innovation potential in applied research through the development of detector systems with applications beyond fundamental physics, e.g. for medical imaging and information technology. The Consortium includes 44 participant institutions, embracing 14 EU Member States, one International EU Interest Organization (CERN), and one EU candidate country. Together with host institutions of 21 other countries, without EU funds benefits, the project involves research in 36 countries. The project is structured in 32 Work Packages (WP): 7 Transnational Access Activities (TA), 2 Virtual Access Activities (VA), 7 Networking Activities (NA) and 14 Joint Research Activities (JRA). Furthermore, 2 WPs take care, respectively, of the “Management and Coordination” of the project and of “Communication and Outreach".


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  
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Topic revision: r24 - 2021-03-18 - RaphaelGranierDeCassagnac
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