Process definition and generation¶
Process definition¶

Defines a process via the process string 
Coupling power selection¶
The orders associated to couplings for a given theory define a powercounting according to which amplitudes are ordered and computed. For theories with an SMlike gauge group the electric charge \(e\) and the strong coupling constant \(g_\mathrm{s}\) are identified as fundamental couplings. They define the fundamental order and the derived order for other couplings and counterterm parameters:
Coupling 
Order 
\(g_\mathrm{s}\) 
\(\mathrm{QCD}^1\) 
\(\alpha_\mathrm{s}\) 
\(\mathrm{QCD}^2\) 
\(e\) 
\(\mathrm{QED}^1\) 
\(\alpha\) 
\(\mathrm{QED}^2\) 
… 
Processes can be defined requesting a particular order in fundamental couplings. For SMlike gauge group it is enough to select specific powers of \(g_\mathrm{s}\) and the corresponding valid orders in \(e\) are automaically selected. The selections are applied using one of the following functions:
Selects all the contribution to the Born amplitude for the process with process number npr. 

Unselects all the contribution to the Born amplitude for the process with process number npr. 


Selects the contribution to the Born amplitude with \(g_\mathrm{s}\) power 

Unselects the contribution to the Born amplitude with \(g_\mathrm{s}\) power 
Selects all the contribution to the Born amplitude for the process with process number 

Unselects all the contribution to the Born amplitude for the process with process number 


Selects the contribution to the Loop amplitude with \(g_\mathrm{s}\) power 

Unselects the contribution to the Loop amplitude with \(g_\mathrm{s}\) power 
For theories with more than two fundamental orders or in EFT the following functions should be used:

Selects for the process with process number 

Selects the contributions to the Born amplitude with power power of the fundanmetal order cid for the process with identifier npr. 
Selects all contributions to the Born amplitude with any power of orders. 

Unselects all contributions to the Born amplitude with any power of orders. 


Selects for the process with process number npr the contribution to the Loop amplitude with power power in the fundamental order cid. 
Selects all contributions to the Loop amplitude with any power of orders. 

Selects all contributions to the Loop amplitude with any power of orders. 

Unselects all contributions to the Loop amplitude with any power of orders. 
Resonance selection¶

Sets for the resonance with resonance number 

Tags the particle with name 
Sets the value of resSE to .true. 

Sets the value of resSE to .true. 
Quarkflow selection¶

Enforces a quarkflow between two quarks 
Process generation¶
Generates processes which were defined using 


Returns whether a process with id 