Rongkun Wang's sandbox for storing HEP infos.

Administrative Memo


Swiss plate to green plate

To get things published

Quick Memo

This is an assorted notes on many aspects I faced in HEP, continuously building up. Knowledge and purely technical guides are mixed up.

ATLAS Induction Day 2017



  • Physics of Generating events
  • Pileup: Some official twiki to introduce Pileup/Pileup reweighting. Pileup, an unavoidable phenomena that occurred when we're running with high luminosity. In order to increase the luminosity, more beam particles are squeezed into the same space, therefore increasing the chance of interaction. With this, we also have unwanted non-deep inelastic interactions that produced pileup jets. The rate of those kind of process can be described by number of vertices(which is used in run 1), or more precisely the average interaction per crossing <μ>.

Detector related Knowledges

Pre-Analysis Preparation

Object Reconstruction

Physics Analysis



View your (Operation Task Point)OTP at GLANCE. You bear the duty for your institute to earn OTP, and also to earn you a chance to give conference talks.

Muon Offline Data Quality (Class 2)


Expert: MDT Operation Oncall

NSW-sTGC related

Firstly, the concept needs to be clear:

  • FELIX is like a big data router, and running it doesn't rely on any other thing. See this FELIX manual for running FELIX.
  • The FELIX GUI is a stand-alone application that can generate board configuration, opc configuration, visualize and modify parameters in a better way than json.
  • The partition is the very same thing used for control ATLAS. The config segment relis on FELIX and OpcServer to send HDLC frame, software ReadOut Driver(swROD) relies on FELIX for data readout. See here as how to run partition with three segments swROD(ROx), TTC, Config.
  • TTC related.
  • You should be having a good picture of how the systems runs before doing it. Here is a very nice summary from our neighbor.
  • How to use UaExpert on FELIX machines: `setupUaExpert; uaexpert`
  • Server related issues are summarized here: SetupServer. See also Computing section.
  • Open points:
    • Scalability: only 3+3 at the moment. Cable connection issue? Parameters specific to type of boards? Or even each single boards?
    • Stability: how long can the system run? Cooling issue: observed crashes, power off to cool down.
    • swROD production machine cannot run partition.




  • Fiducial/Differential
    • Fiducial: xs in each channel, and sum, combined. Also Total xs.
    • Differential: njets, pt, unfolding with bin-by-bin.
  • Coupling
    • STXS Intro: Truth bin: stage0 with ggF(+bbH)/VBF/VH(+ggZH)/ttH(+tH) and reduced stage1 STXS production mode(10 categories). Reco bin: 11 categories.
      • In the first round of run 2 analysis. We also had 9 reco categories.
      • Conf Note 2018: 2 additional categories are added in reco level for: split ttH and added 0jet high pt4l for VHLep
    • STXS POI and corresponding fiducial definition: Twiki. Acceptance calculation
  • Documents

Unfolding of Inclusive M4l

Aiming to unfold m4l distribution inclusive of number of jets. We're also intereseted in unfolding 2D distribution of m4l.

  • Twiki
  • 2018 Paper draft cds: supporting note in svn, in cds
  • Accuracy of simulation:
    • qqZZ Sherpa 2.2.2 NLO for 0,1-jets, LO for 2,3-jets. (QCD)
      • Reweighted to NLO EW as func of m4l
    • ZZ+2j HOEWK (VBF-like process) are produced by Sherpa 2.1.1.
    • ggZZ Sherpa 2.2.2 Generation is performed at leading order+NLO (corresponding to NNLO QCD)
      • Reweighted over m4l to NLO with MCFM samples generated at LO and reweighted to LO with m4l where NLO/LO k-factor is given by theorists.
    • ggH and VH: Powheg NNLOPS + Pythia8
    • ttH: MadGraph5_aMC@NLO + Herwig++

Standard Model



minitree location: /afs/



Search for a light BSM model in Higgs decay channel. Run 2 we merge pseudo-scalar result into our paper.

-- RongkunWang - 2019-05-03

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Topic revision: r73 - 2019-08-16 - RongkunWang
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