Support for detector efficiency corrections for 7TeV CMS data

CMS Physics objects
1

We are looking at CMS open data located at CERN Open Data Portal to understand acceptance effect.

Your data are published here

http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-16-010/index.html

However without having the proper pt/eta dependent efficiency, it is not possible to get the final physics results.

1)Could you pass us the charged particle tracking efficiency for 7TeV pp data in pt and eta?
2)Or point us the corresponding MC open data?

First option is really desirable for external users and easy to provide since you have used it to correct the results already. Maybe because of the policy, first option is not possible but I should seek for the correct procedures.

Cheers,

DongJo

2

Hi, despite the long silence - apologies for that - we’ve been following this up. Just a brief update:

  1. For the efficiencies, there is a study in https://iopscience.iop.org/article/10.1088/1748-0221/9/10/P10009/pdf. Are the values shown in that note of direct use to you, or would you need to estimate them for different kinematic selections?

  2. We are looking at the options for the 7 TeV minimum bias sample which we, unfortunately, do not have available with the same software version as the released 7 TeV data. We have two options, either provide a dataset with an earlier software version (CMSSW_4 series, requiring slc5 environment), or eventually generate a sample with the one corresponding to the released data (CMSSW_5_3_X). Would one of these options be useful for you?

Best, Kati
for the CMS open data team

3

Dear Kati

Thanks for the reply and suggestions. See our comments below,

  1. For the efficiencies, there is a study in https://iopscience.iop.org/article/10.1088/1748-0221/9/10/P10009/pdf. Are the values shown in that note of direct use to you, or would you need to estimate them for different kinematic selections?
    R: firstly if we can get those numbers from Fig. 10, it would be a good starting point. We need to have them in \eta and pt bins as well, not the integrated ones, based on Fig.5, there seems to have different efficiencies in \eta depending on pt. Or If there is no difference, i.e < 5 GeV/c, we can just use what is in Fig. 10 as a rough estimate as a starting point.
  2. We are looking at the options for the 7 TeV minimum bias sample which we, unfortunately, do not have available with the same software version as the released 7 TeV data. We have two options, either provide a dataset with an earlier software version (CMSSW_4 series, requiring slc5 environment), or eventually generate a sample with the one corresponding to the released data (CMSSW_5_3_X). Would one of these options be useful for you?
    R: Maybe the latter option might be better for us. We used “CMSSW 5_3_32”.

Regards,

DongJo