| | 4 | === Basic Syntax Rules === |
| | 5 | |
| | 6 | * Use a ">" to separate the initial state particle(s) from the final state ones. |
| | 7 | |
| | 8 | * Initial state can be one (decay) or two (scattering) particles. |
| | 9 | |
| | 10 | * Use " x x > [[span(z,style=color: #990099;)]] > y y y " form to require particle [[span(z,style=color: #990099;)]] to appear in a s-channel intermediate state (not recommended due to gauge invariance). |
| | 11 | |
| | 12 | * Use " x x > y y y $ [[span(z,style=color: #990099;)]]" form to forbid particle [[span(z,style=color: #990099;)]] from appearing in a s-channel intermediate state (not recommended due to gauge invariance). |
| | 13 | |
| | 14 | * Use " x x > y y y / [[span(z,style=color: #990099;)]]" form to exclude particle [[span(z,style=color: #990099;)]] to appear as internal particle in any diagram. |
| | 15 | |
| | 16 | * Use comma to specify decay chains. For instance "x x > Z W, Z >y y, W > k k" means "x x > Z W" where Z then decays to yy and W to kk. |
| | 17 | * Coupling orders are automatically detected to generate the leading order processes. To explicitly specify coupling orders, add them after the process on the same line:[[br]]x x > y y y / z QCD=0[[br]]x x > Z W QED=2, Z > y y, W > k k[[br]]Note that if a coupling order is omitted, it defaults to infinity (or, for restricted couplings such as HIG in the HEFT model, to the restricted value). |
| | 18 | * Use the multi-label "p" to indicate a proton or an anti-proton.[[br]] The symbol "p~" does not exist. In fact the type of initial state (pp or ppbar or parton-parton fixed energy) is specified later, during the run, in the run_card.dat.[[br]]The multi-lable "j" suggests a final-state jet. |
| | 19 | * Note that the syntax for MadGraph 5 differs slightly from previous versions: a space (" ") is required between particle names, and the decay chain syntax has been upgraded to a more powerful syntax which allows better control of the different processes. |
| | 20 | |
| | 21 | === Process Examples === |
| | 22 | |
| | 23 | || '''PROCESS''' || '''Sample Diagram''' || '''Notes''' || |
| | 24 | |
