Difference: Brenoorzari (58 vs. 59)

Revision 592021-11-24 - trtomei

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Useful info

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  MG5 will then ask if any other program will need to run through some switches that can be left OFF or turned on (programs suitable for shower/hadronization (such as Pythia8); detector simulation (such as Delphes); events analysis (never used this); particles decay (such as MadSpin; a lot of particles decay can be implemented in the generate p p > ... command itself, but MadSpin is very useful in some cases that exclude this possibility); event reweighting (never used this as well)). All these programs need to be installed inside MG5 using the following command install ... (pressing the Tab key twice should show the available softwares; also, using help install shows some useful information). There is a 60s timer that can be stopped by pressing the Tab key. In this example just press Enter to not use anything else.
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Tip: use install pythia8 --pythia8_tarball=/PATH/TO/SOME/PYTHIA/TARBALL to use a given version of Pythia 8 you have already downloaded, instead of letting it download whatever version from the Pythia website.
 After choosing the auxiliary programs, MG5 will give a list of the cards to be used ans asks if any editing is needed. The standard (minimum) cards that MG5 need to perform the calculations are the param_card, that contains all the useful information about the parameters to be set in the model under consideration (particles masses and decay widths, and couplings essentially), and the run_card, that contains information about the simulation parameters (number of events, properties of the initial particles that are interacting, generation restrictions to be set, etc.). More cards, such as the pythia or delphes parameters, are added if needed from the auxiliary programs choosed. In this example case, only the param_card and the run_card are available and can be changed through switches that will open the vi editor, or by giving the path to some other card that is available (more on this later). Just press Enter to not edit anything.

After that MG5 will perform the calculations. In our case, of the inclusive muon pair production, the estimated cross section is 839.1 +- 2.589 pb. Notice that it only considered the photon and the Z boson as the intermediate bosons (the Higgs is not considered due to lack of data maybe?). To change that, using the example where only the photon needs to be considered, one could use one of the following commands:

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-- trtomei - 2021-11-24
 
META FILEATTACHMENT attachment="ALL_backgrounds_mJ.pdf" attr="h" comment="All backgrounds important for the dark Higgs model" date="1554745262" name="ALL_backgrounds_mJ.pdf" path="ALL_backgrounds_mJ.pdf" size="14148" user="brenoorzari" version="1"
META FILEATTACHMENT attachment="ALL_backgrounds_mJ-1.png" attr="" comment="" date="1554745781" name="ALL_backgrounds_mJ-1.png" path="ALL_backgrounds_mJ-1.png" size="69355" user="brenoorzari" version="1"
 
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