MadAnalysis 5

some questions on making an analysis

Asked by von

hello

I am currently learning to use madgraph+madanalysis to do exclusion analysis,after some efforts,I finnally nearly reproduced one analysis ,the CMS-SUS-13-016 on http://madanalysis.irmp.ucl.ac.be/wiki/PhysicsAnalysisDatabase

but I am still uncertain about:

1)on setting the benchmark,should I also tune the irrelevent particles massive?this is a piece of my param_card.dat
   1000006 3.99668493E+02 # ~t_1
   2000006 5.85785818E+02 # ~t_2
   2000015 2.06867805E+06 # ~tau_2
   1000016 1.84708464E+06 # ~nu_tauL
   1000021 9.62000000E+02 # ~g
   1000022 4.40000000E+02 # ~chi_10
   1000023 1.81088157E+06 # ~chi_20
2) I use mssm online calculator to calculate the mass spectrum and decay table,is that OK?
3) after generating the hardron level *.hep,I transform this file to *.root file using delphesMA5tune,then analyze the root file with madanalysis5job,is that right?
4) on using exclusion.py the madanalysis generated,it printed excluded at CL , if CLs=0.05,does it mean my benchmark falls in the 95% limit and may be a "good benchmark point"?

best regards

Question information

Language:
English Edit question
Status:
Solved
For:
MadAnalysis 5 Edit question
Assignee:
No assignee Edit question
Solved by:
Benjamin Fuks
Solved:
Last query:
Last reply:
Revision history for this message
Benjamin Fuks (fuks) said : 		#1

Hi,

1) The exact benchmarks can be obtained on the CMS wiki. Acutally, the full LHE files can be retrieved there.
2) No it is not. See (1).
3) That's correct
4) I do not understand the question. Could you please be more specific.

Cheers,

Benjamin

Revision history for this message
von (cosmopart2012) said : 		#2

Hi Benjamin Fuks:

Thank you for answering

1)seems that a root account is needed to download the lhe files

1)For example,in my model,the mass of gluino and neutralino are 961Gev and 440 Gev,If I want to test my model,should I generate the events and only change the mass of the two particles alone or set other particles to be very massive simultaneously?

4) when using madanalysis in expert mode,I also get a file named "exclusion.py",which is used to return a CLs value for a certain cut,but I do not quite understand the meaning of CLs,If my parameter choice in generating events results in CLs=0.05,does it mean my parameter is excluded at 95% confidnce and can be discarded?

Revision history for this message
Best Benjamin Fuks (fuks) said : 		#3

Hi,

1) Those file are public and you do not need any account to download them. If there is a problem, please directly contact the CMS wiki support team. There is nothing I can do for you here.

1bis) It really depends what you want to do. You can always start from the madgraph built-in MSSM, change the masses and model parameters according to your needs and proceed with event generation: MadGraph -> Pythia -> Delphes-Ma5tune. Then, you can analyze the generated root files through the ma5 analysis that you have downloaded from our webpage.

4) A benchmark can be regarded as excluded at the (1-x) confidence level if one finds CLs < x. Please have a look to our paper:
  http://arxiv.org/abs/arXiv:1407.3278
  for more information.

Cheers,

Benjamin

Revision history for this message
von (cosmopart2012) said : 		#4

Hi,Fuks

Thank you very much,you really saved the day

best regards

von

Revision history for this message
von (cosmopart2012) said : 		#5

Thanks Benjamin Fuks, that solved my question.