Description of the UFO models to generate Dirac magentic monopoles

Dirac magentic 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).

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.

1. 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 textfile named 'Spin0ScriptDY.txt'): import model mono_spinzero_beta generate p p > a > mm+ mm- output Pre5For

2. 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

3. Run the part 1 of the script: ./bin/mg5_aMC Spin0ScriptDY.txt

4. A new folder named Pre5For will be generated.

5. Go to Pre5For/Sources and open genps.inc.

6. Use the absolute path of 'maxparticles.inc' on line 5.

7. Run the part 2 of the script: ./bin/mg5_aMC Spin0ScriptDY2.txt

8. 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 the part 1 of the script.

2. 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

2. 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

3. Run the part 1 of the script: ./bin/mg5_aMC Spin0Script.txt

4. A new folder named Pre5 will be generated.

5. Go to Pre5/Sources and open genps.inc.

6. Use the absolute path of 'maxparticles.inc' on line 5.

7. Run the part 2 of the script: ./bin/mg5_aMC Spin0Script2.txt

8. 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 the part 1 of the script.