# Latest **URL:** https://fccsw-forum.web.cern.ch/latest.md [Latest](https://fccsw-forum.web.cern.ch/latest.md) · [Categories](https://fccsw-forum.web.cern.ch/categories.md) · [Tags](https://fccsw-forum.web.cern.ch/tags.md) --- ## [Welcome to Discourse](https://fccsw-forum.web.cern.ch/t/welcome-to-discourse/8)
**Author:** [@system](https://fccsw-forum.web.cern.ch/u/system)\ **Replies:** 0\ **Last updated:** [April 15, 2019, 9:42am UTC](https://fccsw-forum.web.cern.ch/t/welcome-to-discourse/8 "2019-04-15T09:42:01Z")
FCCSW is a set of software packages, tools, and standards to help different FCC studies work together. Common software helps to avoid duplicated effort and compare results. In addition, the software group provides infras… --- ## [Variable bins in fccanalysis final option script?](https://fccsw-forum.web.cern.ch/t/variable-bins-in-fccanalysis-final-option-script/298)
**Author:** [@asenol](https://fccsw-forum.web.cern.ch/u/asenol)\ **Replies:** 0\ **Last updated:** [September 16, 2026, 9:25am UTC](https://fccsw-forum.web.cern.ch/t/variable-bins-in-fccanalysis-final-option-script/298 "2026-09-16T09:25:50Z")
Dear Experts, Within the fccanalysis setup, under the ‘analysis final’ command, can we set up variable bins? For example, “photon\_pt”:{‘name’:‘photon\_pt’,“title”: “p^{#gamma}\_ {T} \[GeV\]‘,’bin‘:10, “xmin”:0, ’xmax”:3000} … --- ## [Legacy vertexing issue](https://fccsw-forum.web.cern.ch/t/legacy-vertexing-issue/219)
**Author:** [@aiwieder](https://fccsw-forum.web.cern.ch/u/aiwieder)\ **Replies:** 4\ **Last updated:** [August 6, 2026, 7:21am UTC](https://fccsw-forum.web.cern.ch/t/legacy-vertexing-issue/219 "2026-08-06T07:21:09Z")
I am currently trying to update my analysis to run in v0.9.0 (the last version compatible with winter2023 MC I believe) of the stack however it seems that the vertexing is broken. An easy reproduction of the issue is to… --- ## [DRDCaloDD4hepTutorial: Failing Geometry Visualization](https://fccsw-forum.web.cern.ch/t/drdcalodd4heptutorial-failing-geometry-visualization/296)
**Author:** [@nkontaxa](https://fccsw-forum.web.cern.ch/u/nkontaxa)\ **Replies:** 2\ **Last updated:** [July 3, 2026, 8:56am UTC](https://fccsw-forum.web.cern.ch/t/drdcalodd4heptutorial-failing-geometry-visualization/296 "2026-07-03T08:56:35Z")
While following the dd4hep tutorial for DRDCalo on my Windows machine connected to lxplus through VSCode, when following the instructions and executing the command geoWebDisplay simplecalo1/compact/simplecalo1.xml to vis… --- ## [Potential bug with FittedTracksWithFilteredHits collection ALLEGRO\_o1\_v03](https://fccsw-forum.web.cern.ch/t/potential-bug-with-fittedtrackswithfilteredhits-collection-allegro-o1-v03/295)
**Author:** [@alexansc](https://fccsw-forum.web.cern.ch/u/alexansc)\ **Replies:** 1\ **Last updated:** [July 2, 2026, 4:08pm UTC](https://fccsw-forum.web.cern.ch/t/potential-bug-with-fittedtrackswithfilteredhits-collection-allegro-o1-v03/295 "2026-07-02T16:08:27Z")
I am experiencing an error when using the track finding/track fitter (not sure where the error occurs) for the ALLEGRO\_o1\_v03 simulation. I was writing a script to plot tracks overlayed with helices, and I found that fo… --- ## [Lifetime/Beam parameters in Herwig/Sherpa](https://fccsw-forum.web.cern.ch/t/lifetime-beam-parameters-in-herwig-sherpa/294)
**Author:** [@selvaggi](https://fccsw-forum.web.cern.ch/u/selvaggi)\ **Replies:** 0\ **Last updated:** [June 9, 2026, 6:09pm UTC](https://fccsw-forum.web.cern.ch/t/lifetime-beam-parameters-in-herwig-sherpa/294 "2026-06-09T18:09:56Z")
Dear MC conveners I am playing around with Zqq events in Herwig/Sherpa. I would like to come up with a “baseline” Zqq configuration, before playing with various MC tunes. I have the following questions, for Herwig and … --- ## [Question on wzp6\_ee\_mumuH\_Hbs samples and QFV UFO m\_mumu shape](https://fccsw-forum.web.cern.ch/t/question-on-wzp6-ee-mumuh-hbs-samples-and-qfv-ufo-m-mumu-shape/293)
**Author:** [@lia](https://fccsw-forum.web.cern.ch/u/lia)\ **Replies:** 0\ **Last updated:** [June 5, 2026, 9:10pm UTC](https://fccsw-forum.web.cern.ch/t/question-on-wzp6-ee-mumuh-hbs-samples-and-qfv-ufo-m-mumu-shape/293 "2026-06-05T21:10:06Z")
Dear Experts I have a question about a 2HDM-QFV UFO sample for FCC-ee H-\>bs at sqrt(s)=240 GeV. We tested wzp6\_ee\_mumuH\_Hbs\_ecm240, which is a 2HDM-QFV UFO sample with the four-body process process proc = “e-”, “e+” =\>… --- ## [Coding guidelines?](https://fccsw-forum.web.cern.ch/t/coding-guidelines/292)
**Author:** [@ueinhaus](https://fccsw-forum.web.cern.ch/u/ueinhaus)\ **Replies:** 1\ **Last updated:** [May 19, 2026, 1:20pm UTC](https://fccsw-forum.web.cern.ch/t/coding-guidelines/292 "2026-05-19T13:20:32Z")
Is there a document for general coding guidelines for key4hep, specifically Gaudi algorithms? Stuff like naming conventions, capitalisation, spacing, but also technical things like preference of pointers vs. references … --- ## [Permission issue when generating LHE files for FCCee EWK physics studies](https://fccsw-forum.web.cern.ch/t/permission-issue-when-generating-lhe-files-for-fccee-ewk-physics-studies/273)
**Author:** [@ltoffoli](https://fccsw-forum.web.cern.ch/u/ltoffoli)\ **Replies:** 2\ **Last updated:** [April 16, 2026, 7:51am UTC](https://fccsw-forum.web.cern.ch/t/permission-issue-when-generating-lhe-files-for-fccee-ewk-physics-studies/273 "2026-04-16T07:51:53Z")
Dear FCCSW experts, I am trying to produce some samples with the FCC EventProducer for some EWK studies. I am following the instructions in the README there. When generating LHE files with gridpacks, I get the following… --- ## [Vertex reconstruction algorithm](https://fccsw-forum.web.cern.ch/t/vertex-reconstruction-algorithm/270)
**Author:** [@sbenabde](https://fccsw-forum.web.cern.ch/u/sbenabde)\ **Replies:** 3\ **Last updated:** [April 8, 2026, 9:40am UTC](https://fccsw-forum.web.cern.ch/t/vertex-reconstruction-algorithm/270 "2026-04-08T09:40:43Z")
Hi, I have been trying to reconstruct displaced vertices with the VertexFitterSimple agorithm, but it seems like the signal is too collimated and the reconstruction of the vertices does not work. The signal samples are … --- ## [Getting e+e- pair from Z in e+e- -\> ZH samples](https://fccsw-forum.web.cern.ch/t/getting-e-e-pair-from-z-in-e-e-zh-samples/269)
**Author:** [@tofourni](https://fccsw-forum.web.cern.ch/u/tofourni)\ **Replies:** 11\ **Last updated:** [March 31, 2026, 9:30am UTC](https://fccsw-forum.web.cern.ch/t/getting-e-e-pair-from-z-in-e-e-zh-samples/269 "2026-03-31T09:30:34Z")
Hi, I am using wzp6\_ee\_eeH\_ecm240 for my analysis and I want to get the e+e- pair coming from the Z decay by using MC information. I wanted to get the true pair by searching for e+ and e- whose parent is the Z but when… --- ## [Jet reconstruction (Durham algorithm)](https://fccsw-forum.web.cern.ch/t/jet-reconstruction-durham-algorithm/271)
**Author:** [@sbenabde](https://fccsw-forum.web.cern.ch/u/sbenabde)\ **Replies:** 0\ **Last updated:** [March 30, 2026, 2:29pm UTC](https://fccsw-forum.web.cern.ch/t/jet-reconstruction-durham-algorithm/271 "2026-03-30T14:29:31Z")
Hi, I am trying to reconstruct jets for my self-generated signal samples in which I require a Z boson to decay into a quark pair. I am using the durham kt algorithm as follows: .Define(“RP\_noMu”, “FCCAnalyses::… --- ## [AttributeError for eventsProcessed in latest key4hep stack (-r 2026-02-01)](https://fccsw-forum.web.cern.ch/t/attributeerror-for-eventsprocessed-in-latest-key4hep-stack-r-2026-02-01/267)
**Author:** [@sbakare](https://fccsw-forum.web.cern.ch/u/sbakare)\ **Replies:** 2\ **Last updated:** [March 18, 2026, 12:45pm UTC](https://fccsw-forum.web.cern.ch/t/attributeerror-for-eventsprocessed-in-latest-key4hep-stack-r-2026-02-01/267 "2026-03-18T12:45:33Z")
Hello, I ran into an error : AttributeError: 'TNetXNGFile' object has no attribute 'eventsProcessed' when using the latest key4hep stack (source /cvmfs/sw.hsf.org/key4hep/setup.sh -r 2026-02-01) Interestingly, this sam… --- ## [Inflated scaling in stage 2 when using intermediate tools (like uproot)](https://fccsw-forum.web.cern.ch/t/inflated-scaling-in-stage-2-when-using-intermediate-tools-like-uproot/266)
**Author:** [@sbakare](https://fccsw-forum.web.cern.ch/u/sbakare)\ **Replies:** 2\ **Last updated:** [March 17, 2026, 9:48am UTC](https://fccsw-forum.web.cern.ch/t/inflated-scaling-in-stage-2-when-using-intermediate-tools-like-uproot/266 "2026-03-17T09:48:31Z")
Hi everyone, I wanted to share a quick observation in case it helps anyone doing intermediate ML steps between analysis stages. I was using uproot between stage 1 and 2 to add BDT scores to my trees, and I realized upr… --- ## [Cross section uncertainty for centrally produced samples](https://fccsw-forum.web.cern.ch/t/cross-section-uncertainty-for-centrally-produced-samples/265)
**Author:** [@sbakare](https://fccsw-forum.web.cern.ch/u/sbakare)\ **Replies:** 3\ **Last updated:** [March 17, 2026, 2:47am UTC](https://fccsw-forum.web.cern.ch/t/cross-section-uncertainty-for-centrally-produced-samples/265 "2026-03-17T02:47:49Z")
Hello! Is there a way I can get the uncertainty for cross sections of the samples from https://fcc-physics-events.web.cern.ch? --- ## [eedE visualization does not work in my laptop](https://fccsw-forum.web.cern.ch/t/eede-visualization-does-not-work-in-my-laptop/264)
**Author:** [@mpandopo](https://fccsw-forum.web.cern.ch/u/mpandopo)\ **Replies:** 1\ **Last updated:** [March 6, 2026, 10:09am UTC](https://fccsw-forum.web.cern.ch/t/eede-visualization-does-not-work-in-my-laptop/264 "2026-03-06T10:09:55Z")
I tried visualizing both the file I generated following the steps in the tutorial (p8\_ee\_Zss\_ecm91.edm4hep.json) and the sample file available on the eedE website. I’m using Google Chrome, but everything just shows up em… --- ## [FCCAnalysis plotting error](https://fccsw-forum.web.cern.ch/t/fccanalysis-plotting-error/262)
**Author:** [@sbenabde](https://fccsw-forum.web.cern.ch/u/sbenabde)\ **Replies:** 7\ **Last updated:** [February 26, 2026, 3:38pm UTC](https://fccsw-forum.web.cern.ch/t/fccanalysis-plotting-error/262 "2026-02-26T15:38:11Z")
Dear experts, I’m having some issues running the plotting step of FCCAnalyses. Stage1 & final works fine, but when trying to run the plotting - I get the following error: ----\> INFO: Input directory: DarkPhotons/histos/… --- ## [Newbie : Simulate events in the 4 detector concepts](https://fccsw-forum.web.cern.ch/t/newbie-simulate-events-in-the-4-detector-concepts/258)
**Author:** [@rquaglia](https://fccsw-forum.web.cern.ch/u/rquaglia)\ **Replies:** 5\ **Last updated:** [February 23, 2026, 2:00pm UTC](https://fccsw-forum.web.cern.ch/t/newbie-simulate-events-in-the-4-detector-concepts/258 "2026-02-23T14:00:05Z")
Dear experts, I am new to FCC-ee studies and i want to perform studies for FCC-ee at the Z-pole for a signal decay mode being Lb→ Lambda (ppi) gamma. I would like to be able to run the production in the 4 detectors for… --- ## [FCCAnalyses 0.12.0](https://fccsw-forum.web.cern.ch/t/fccanalyses-0-12-0/261)
**Author:** [@jsmiesko](https://fccsw-forum.web.cern.ch/u/jsmiesko)\ **Replies:** 0\ **Last updated:** [February 11, 2026, 1:53pm UTC](https://fccsw-forum.web.cern.ch/t/fccanalyses-0-12-0/261 "2026-02-11T13:53:47Z")
Dear all, I’m pleased to announce that the new release of FCCAnalyses version 0.12.0 is now available in the latest Key4hep stack release (2026-02-01). Notable improvements in this release include: One can provide a … --- ## [Large samples and batch](https://fccsw-forum.web.cern.ch/t/large-samples-and-batch/256)
**Author:** [@scattola](https://fccsw-forum.web.cern.ch/u/scattola)\ **Replies:** 2\ **Last updated:** [December 1, 2025, 2:11pm UTC](https://fccsw-forum.web.cern.ch/t/large-samples-and-batch/256 "2025-12-01T14:11:32Z")
Hi everyone, I am currently developing an analysis for my bachelor thesis and I have so far tested with 1 or 5 millions of events by just specifying the --nevents variable. For my final step I think I will be required t… --- ## [FCC Tutorial, 2.4.2: Part II: Produce a flat tree and analyse events. error: no member named 'TrackerHitData' in namespace 'edm4hep'](https://fccsw-forum.web.cern.ch/t/fcc-tutorial-2-4-2-part-ii-produce-a-flat-tree-and-analyse-events-error-no-member-named-trackerhitdata-in-namespace-edm4hep/253)
**Author:** [@sbakare](https://fccsw-forum.web.cern.ch/u/sbakare)\ **Replies:** 11\ **Last updated:** [November 10, 2025, 5:35pm UTC](https://fccsw-forum.web.cern.ch/t/fcc-tutorial-2-4-2-part-ii-produce-a-flat-tree-and-analyse-events-error-no-member-named-trackerhitdata-in-namespace-edm4hep/253 "2025-11-10T17:35:03Z")
Hi! I am following the FCC Tutorial. In, 2.4.2: Part II: Produce a flat tree and analyse events, I am running into the error: no member named ‘TrackerHitData’ in namespace ‘edm4hep’ while trying to run the treemaker\_flav… --- ## [FCCAnalyses v0.11.0](https://fccsw-forum.web.cern.ch/t/fccanalyses-v0-11-0/243)
**Author:** [@jsmiesko](https://fccsw-forum.web.cern.ch/u/jsmiesko)\ **Replies:** 0\ **Last updated:** [June 4, 2025, 11:54am UTC](https://fccsw-forum.web.cern.ch/t/fccanalyses-v0-11-0/243 "2025-06-04T11:54:29Z")
Dear all, I’m pleased to announce that the new release of FCCAnalyses version 0.11.0 has been made available in the latest Key4hep stack release. Notable improvements in this release include: Introduction of submit s… --- ## [Using privately & centrally produced samples at the same time](https://fccsw-forum.web.cern.ch/t/using-privately-centrally-produced-samples-at-the-same-time/242)
**Author:** [@saaumill](https://fccsw-forum.web.cern.ch/u/saaumill)\ **Replies:** 5\ **Last updated:** [March 10, 2025, 1:52pm UTC](https://fccsw-forum.web.cern.ch/t/using-privately-centrally-produced-samples-at-the-same-time/242 "2025-03-10T13:52:29Z")
I am using the histmaker to process signal and background events. I want to add a new background that I created privately and is therefore not found in the production. How can I add it (p8\_ee\_llZZ\_ecm240\_edm4hep.root st… --- ## [Tau Jet Identification in Higgs Semi-Leptonic Decay channel](https://fccsw-forum.web.cern.ch/t/tau-jet-identification-in-higgs-semi-leptonic-decay-channel/240)
**Author:** [@Apranik.F](https://fccsw-forum.web.cern.ch/u/Apranik.F)\ **Replies:** 5\ **Last updated:** [December 10, 2024, 4:43pm UTC](https://fccsw-forum.web.cern.ch/t/tau-jet-identification-in-higgs-semi-leptonic-decay-channel/240 "2024-12-10T16:43:38Z")
Hello, I’ve been working on semi-leptonic decay channels of the Higgs boson at √s = 125 GeV to study the electron Yukawa coupling and the corresponding backgrounds (preliminary study was done by David d’Enterria). For t… --- ## [FCCAnalyses v0.10.0](https://fccsw-forum.web.cern.ch/t/fccanalyses-v0-10-0/237)
**Author:** [@jsmiesko](https://fccsw-forum.web.cern.ch/u/jsmiesko)\ **Replies:** 0\ **Last updated:** [October 10, 2024, 10:12am UTC](https://fccsw-forum.web.cern.ch/t/fccanalyses-v0-10-0/237 "2024-10-10T10:12:35Z")
Dear all, I’m pleased to announce that the new release of FCCAnalyses version 0.10.0 has been made available in the Key4hep stack release. Notable improvements in this release include: Changes needed for EDM4hep 1.0 … --- ## [Daughter Particles Information in Full Simulation](https://fccsw-forum.web.cern.ch/t/daughter-particles-information-in-full-simulation/233)
**Author:** [@lia](https://fccsw-forum.web.cern.ch/u/lia)\ **Replies:** 4\ **Last updated:** [August 14, 2024, 1:56pm UTC](https://fccsw-forum.web.cern.ch/t/daughter-particles-information-in-full-simulation/233 "2024-08-14T13:56:27Z")
Dear All, I am currently working on Full Simulation and have generated ee--\>WW--\>munumunu events. I would like to verify the truth information to ensure that the W bosons have decayed correctly into muon-neutrino pairs. … --- ## [Support for command line arguments](https://fccsw-forum.web.cern.ch/t/support-for-command-line-arguments/218)
**Author:** [@aiwieder](https://fccsw-forum.web.cern.ch/u/aiwieder)\ **Replies:** 10\ **Last updated:** [August 14, 2024, 12:50pm UTC](https://fccsw-forum.web.cern.ch/t/support-for-command-line-arguments/218 "2024-08-14T12:50:25Z")
Hi, I have an analysis that studies a number of decays, e.g Bd2KstNuNu, Kst-\>K pi and Bs2PhiNuNu, phi-\>KK, and uses a BDT at each analysis stage to reduce bkgs. Previously I ran this via snakemake but I’m now updating i… --- ## [FCCAnalysis with non-dataframe based processing](https://fccsw-forum.web.cern.ch/t/fccanalysis-with-non-dataframe-based-processing/235)
**Author:** [@aiwieder](https://fccsw-forum.web.cern.ch/u/aiwieder)\ **Replies:** 0\ **Last updated:** [August 14, 2024, 12:25pm UTC](https://fccsw-forum.web.cern.ch/t/fccanalysis-with-non-dataframe-based-processing/235 "2024-08-14T12:25:09Z")
Hi, I’m modernising my previous analysis ready for some detector studies and like the built in cluster submission and file bookkeeping available in the standard stage1.py etc kind of analysis steps like in the mH-recoil… --- ## [Mismatch of photon information between "Photons" and "ReconstructedParticles" collections](https://fccsw-forum.web.cern.ch/t/mismatch-of-photon-information-between-photons-and-reconstructedparticles-collections/229)
**Author:** [@xzuo](https://fccsw-forum.web.cern.ch/u/xzuo)\ **Replies:** 2\ **Last updated:** [July 19, 2024, 5:19pm UTC](https://fccsw-forum.web.cern.ch/t/mismatch-of-photon-information-between-photons-and-reconstructedparticles-collections/229 "2024-07-19T17:19:49Z")
Dear all, There seems to be a mismatch in reconstructed photons between the “Photons” and “ReconstructedParticles” in FCC samples in EDM4HEP format. This issue has been raised in an old thread Photons at Delphes FCC-ee … --- ## [Legend options in analysis\_plots.py](https://fccsw-forum.web.cern.ch/t/legend-options-in-analysis-plots-py/221)
**Author:** [@ymahmoud](https://fccsw-forum.web.cern.ch/u/ymahmoud)\ **Replies:** 7\ **Last updated:** [July 17, 2024, 3:08pm UTC](https://fccsw-forum.web.cern.ch/t/legend-options-in-analysis-plots-py/221 "2024-07-17T15:08:50Z")
Hello FCC community, I am trying to make some plots for lots of samples and I a legend for each of the samples. The problem is the legends don’t fit inside the canvas and are drawn vertically in one column. Is there a w… [Next page](https://fccsw-forum.web.cern.ch/latest.md?page=1)