Table of Contents

• Important Steps With References
  • CMS dataset naming convention
  • How to search CMS dataset for analysis
  • Compute Cross Sections with the GenXSecAnalyzer
• FAQ
• HIP Problem (2016)

Important Steps With References

CMS dataset naming convention

CMS dataset name follows the following conventions:

PROCESS_RANGETYPE-RANGELOWToRANGEHIGH_FILTER_TUNE_COMMENT_COMENERGY-GENERATOR

where

• PROCESS is the Phyics process in the sample, e.g. QCD, TT, W, DY
• RANGETYPE is the variable the sample is binned in, e.g. PT,M
• RANGELOW is the lower bound of that range in GeV, e.g. 0,10,200
• RANGEHIGH is the upper bound
• FILTER denotes information on additional filters applied
• TUNE is the underlying-event tune (e.g. TuneZ2Star)
• COMMENT for additional comments
• COMENERGY cnter of mass collision enetgy, e.g. 7TeV, 10TeV
• GENERATOR is the generator used, e.g. pythia6, herwigpp, sherpa

Reference: https://twiki.cern.ch/twiki/bin/viewauth/CMS/ProductionDataSetNames

How to search CMS dataset for analysis

1. Locate data sample from DAS: https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookLocatingDataSamples
2. To check the latest recommended available dataset check the official PdmV twiki: https://twiki.cern.ch/twiki/bin/view/CMS/PdmV
3. Generator group gitbook: How to search for datasets in mcm

Compute Cross Sections with the GenXSecAnalyzer

https://twiki.cern.ch/twiki/bin/viewauth/CMS/HowToGenXSecAnalyzer

FAQ

1. What is PackedCandidate collection?

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2. What is difference between PackedCandidate and associatedPackedPFCandidates?

HIP Problem (2016)

• High energy deposition in the bulk of the SiStrip sensors can cause a temporary saturation of the APV25 front-end chip and introduce significant dead-time into the detector readout system.
• The High Energy Deposition can be caused by inelastic interactions between hadrons and the nuclei of silicon sensors producing fragments that highly ionize the sensor: These particles are generally referred to as Highly Ionizing Particles.
• A HIP, when crossing a tracker module, can blind an APV for ~28 bunch crossings (~700ns).
• pre-VFP era: The era when the HIP effect was there.
• post-VFP era: The era when the HIP effect was not there
• VFP: Preamplifier Feedback Voltage Bias

Detailed explanation of this effect: Master thesis of Markéta JANSOVÁ: https://cds.cern.ch/record/2647308/files/CERN-THESIS-2018-242.pdf