Testing the complex mass scheme implementation

Basic Syntax Rules

• Use a ">" to separate the initial state particle(s) from the final state ones.

• Initial state can be one (decay) or two (scattering) particles.

• Use " x x > z > y y y " form to require particle z to appear in a s-channel intermediate state (not recommended due to gauge invariance).

• Use " x x > y y y $ z" form to forbid particle z from appearing in a s-channel intermediate state (not recommended due to gauge invariance).

• Use " x x > y y y / z" form to exclude particle z to appear as internal particle in any diagram.

• 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.
• 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:
  x x > y y y / z QCD=0
  x x > Z W QED=2, Z > y y, W > k k
  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).
• Use the multi-label "p" to indicate a proton or an anti-proton.
  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.
  The multi-lable "j" suggests a final-state jet.
• 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.

Process Examples

PROCESS

Sample Diagram

Notes