Difference: Brenoorzari (38 vs. 39)

Revision 392020-10-01 - brenoorzari

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14/04/2020

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I've been working on my master dissertation. I am finishing Thiago's corrections. Everything is almost done, there are just a few thing to work on. I need to generate the cross section graphs from the files xsecs_* inside Delphes folder in my computer (they are also at my area in headtop, inside the folders named plot_xsecs). The macro to generate those graphs is plot_xsecs_mzp_mdh_mdm.C.
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I've been working on my master dissertation. I am finishing Thiago's corrections. Everything is almost done, there are just a few things to work on. I need to generate the cross section graphs from the files xsecs_* inside Delphes folder in my computer (they are also at my area in headtop, inside the folders named plot_xsecs). The macro to generate those graphs is plot_xsecs_mzp_mdh_mdm.C.
  There are other macros to plot the exclusion reginos inside delphes folder that are plot_top_xsecs_lumi_interpolation.C, only_plot_top_xsecs_lumi.C and only_plot_top_xsecs_every_lumi.C. The files that I need are at/ are being created at the testezao/top/ folder. In headtop, every ultimate_* macro inside the Delphes folder is analyzing the events generated by MadGraph. They are named as 400MET_*. There are events for fixed m_{d_{H}} with m_{Z'} and m_{\chi} varying, and for fixed m_{Z'} and m_{\chi}, for m_{d_{H}} and g_{\chi} varying. The results are in agreement with the paper.
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  • mzp_mchi_excl_comp.png:
    mzp_mchi_excl_comp.png

  • mdh_gchi_excl_comp.png:
    mdh_gchi_excl_comp.png

01/10/2020

I've been working with the FIMP model. Its simulation using MadGraph + Pythia + Delphes (going to call it just Delphes for simplicity) is not that good, since there are a lot of electrons/muons missing. Eduardo suggested that this is happening because of a generation cut (MadGraph or Pythia or even Delphes) that I am going to investigate. I am also trying to simulate it using the FullSim of CMSSW, but it might be harder.

The Delphes generated events are in the folder ~/MG5_aMC_v2_6_6/FIMP_leptons_varying_width. An important macro is in the Delphes folder under the name Delphes_FIMP_hist.C and some results are in the folder Delphes_FIMP. 10000 events were generated for each decay width value and from run_01 to run_10 the decay length (c\tau) is approximately 100 mm, 200 mm, ..., 1000 mm and runs 11, 12, ..., 15 are 2 m, 4 m, 8 m, 16 m, 32 m respectively. Run_16 is a prompt (setting the decay width to 1) test. In MadGraph the syntax to simulate the events is p p > he~ HE~, and the F decay is being performed by Pythia through changes in the SLHA table. The tracks transversal impact parameter seems to be what I expected, however, the number of reconstructed (generated) electrons + muons that is around 1100 (7600) is much lower than the ~ 20000 expected from the Fs decay. I need to test a few things to find out where the problem is:

  • Change the s0, F mass difference to see if events that contain leptons with higher p_T are sufficient (this would point to a generator cut that might be caused by Madgraph, Pythia or Delphes)
  • Check the number of s0 generated particles (if this number is 20000, this would point only to Pythia or Delphes, I guess)
  • Check the reco and gen leptons p_T (this is not that useful since I would expect only leptons that already passed MadGraph lepton p_T restriction)
  • Check gen particle status (from Pythia log they must be +/- 23)
 

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  • sensitivity_paper.png:
    sensitivity_paper.png
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META FILEATTACHMENT attachment="sensitivity_paper.png" attr="" comment="" date="1582123342" name="sensitivity_paper.png" path="sensitivity_paper.png" size="27580" user="brenoorzari" version="1"
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META FILEATTACHMENT attachment="sensitivity_paper.png" attr="h" comment="" date="1582123342" name="sensitivity_paper.png" path="sensitivity_paper.png" size="27580" user="brenoorzari" version="1"
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