How to do local Physics Analysis ?

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Discussion Overview

The discussion revolves around the feasibility of conducting local physics analysis using the CMS software from the LHC at CERN. Participants explore the requirements for accessing the software and data, as well as the limitations of performing analysis outside of the CMS collaboration.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant inquires about downloading the CMS software for local use and performing physics analysis.
  • Another participant asserts that downloading the software is not possible without being part of the CMS Collaboration and emphasizes the necessity of access to large datasets.
  • A different participant mentions that some older experiments may have released parts of their data and analysis software, but questions the capability of local computers to handle meaningful analysis due to dataset sizes.
  • Frustration is expressed regarding the process of obtaining a primary CERN account, with a question about whether physical presence at CERN is required.
  • A participant explains that joining an experiment requires a commitment of time and financial contributions, highlighting the extensive effort involved in operating the detectors.
  • Another participant suggests that local analysis could be conducted using individual packages for Monte Carlo data generation, referencing specific software tools and the availability of training data on the CMS website.
  • One participant reiterates that access to real data is contingent upon joining an experiment.

Areas of Agreement / Disagreement

Participants generally agree that access to the CMS software and real data is restricted to members of the CMS collaboration, but there is disagreement about the potential for local analysis using alternative methods or datasets.

Contextual Notes

Limitations include the requirement for collaboration membership to access real data, the size of datasets, and the potential challenges associated with using analysis software on local machines.

Who May Find This Useful

This discussion may be of interest to individuals considering participation in high-energy physics experiments, those exploring local analysis methods, or anyone seeking to understand the operational structure of collaborations like CMS at CERN.

welatiger
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How to do local Physics Analysis ??

You Know all the LHC machine at CERN, and the CMS detector (Compact Muon Solenoid)

This detector run a CMSSW ( CMS Software ) on CERN machines, can i download that software on my local machine, run it and do physics analysis? if yes how to download it, and what is it's size??

Thank you
 
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No you cannot download it - you are not part of the CMS Collaboration. Second, if you were to download it it would do you no good without the data. This data is many petabytes in size.
 


I think 1-2 older experiments released a part of their source data and analysis software, or plan to do so.
I'm not sure if your local computer can do any interesting analysis - the datasets are smaller than those of current experiments, but they are still large. In addition, it might take some time to get used to the analysis software.
 
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Oh, thank you, I'm really frustrated.
So how to obtain a primary CERN account, Is it necessary to be at CERN office.
 
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You need to join one of the experiments, and you need to put in a certain minimum amount of time - usually a year - doing tasks of general service to the experiment. The experiments have put in literally millions of hours operating, aligning, calibrating, etc. the detectors, and they don't let people say "OK, now that you chumps have done all the hard work, send me the data and I will analyze it." Also, each experiment has a mandated contribution of around 15 kCHF per member per year to the "common fund" to cover consumables like magnetic media for data storage, gas for the detector, etc.
 


So, there is no way to do physics analysis locally expect by using the individual packages, i use for MonteCarlo generation of data (LanHep -> MadGraph -> Pythia -> Geant4 -> ROOT -> Physics Analysis), and there are some real data for training available at the CMS website.

Is that suitable ?
 
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Let me say this again. You will not have access to real data unless you join an experiment.
 

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