wiki:MonopoleDY

Version 6 (modified by ArkaSantra, 10 days ago) (diff)

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Description of the UFO models to generate Dirac magnetic monopoles

Dirac magnetic monopoles can be generated by Drell-Yan process or photon fusion process. The UFO models shown here describe both the processes and generate the corresponding LHE files. These models were tested for three spin cases (0, 1/2 and 1) and two processes (photon fusion and Drell-Yan). In the models attached in this page, there are two different couplings used:

  1. velocity independent coupling models: mono_spinzero, mono_spinhalf and mono_spinone.
  2. velocity dependent coupling models: mono_spinzero_beta, mono_spinhalf_beta, mono_spinone_beta.

Details of these models can be found in arXiv:1808.08942.

A. Instructions to run Drell-Yan spin zero model:

  1. Part 1 of the script to run spin zero monopole model (put the following snippet in a text file named 'Spin0ScriptDY.txt'):

import model mono_spinzero_beta
generate p p > a > mm+ mm-
output Pre5For

  1. Part 2 of the script to run spin zero monopole model (put the following snippet in a textfile named 'Spin0ScriptDY2.txt'):
launch Pre5For
analysis=MADANALYSIS_4
set run_card ebeam1 6500
set ebeam2 6500
set lpp1 1
set lpp2 1
set pdlabel nn23lo1
set lhaid 230000
set nevents 1000
set dynamical_scale_choice -1
set fixed_couplings False
set param_card mass 25 125
set mass 4110000 6000
set decay 4110000 0.000000e+0
set gch 1 1.0

  1. Run the part 1 of the script: ./bin/mg5_aMC Spin0ScriptDY.txt
  1. A new folder named Pre5For will be generated.
  1. Go to Pre5For/Sources and open genps.inc.
  1. Use the absolute path of 'maxparticles.inc' on line 5.
  1. Run the part 2 of the script: ./bin/mg5_aMC Spin0ScriptDY2.txt
  1. If you don't change the part 1 of the script at all (you only need to change it to import different monopole models), then you just need to use steps c-f only once. After that, in step g, change the mass parameter in script 2 and run for different mass points.
  1. 'For different spin models, one just needs to import those corresponding models in part 1 of the script.'

B. Instructions to run photon fusion spin zero model:

  1. Part 1 of the script to run spin zero monopole model (put the following snippet in a textfile named 'Spin0Script.txt'):
    import model mono_spinzero_beta
    generate a a > mm+ mm-
    output Pre5
    
    
  1. Part 2 of the script to run spin zero monopole model (put the following snippet in a textfile named 'Spin0Script2.txt'):
launch Pre5
analysis=madanalysis5
set run_card ebeam1 6500
set ebeam2 6500
set lpp1 2
set lpp2 2
set pdlabel nn23lo1
set lhaid 230000
set nevents 1000
set dynamical_scale_choice -1
set fixed_couplings False
set param_card mass 25 125
set mass 4110000 6000
set decay 4110000 0.000000e+0
set gch 1 1.0

  1. Run the part 1 of the script: ./bin/mg5_aMC Spin0Script.txt
  1. A new folder named Pre5 will be generated.
  1. Go to Pre5/Sources and open genps.inc.
  1. Use the absolute path of 'maxparticles.inc' on line 5.
  1. Run the part 2 of the script: ./bin/mg5_aMC Spin0Script2.txt
  1. If you don't change the part 1 of the script at all (you only need to change it to import different monopole models), then you just need to use steps c-f only once. After that, in step g, change the mass parameter in script 2 and run for different mass points.
  1. 'For different spin models, one just needs to import those corresponding models in part 1 of the script.'

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