GenEvA (I): A new framework for event generation

Understand

We show how many contemporary issues in event generation can be recast in terms of partonic calculations with a matching scale.

• This framework is called GenEvA, and a key ingredient is a new notion of phase space which avoids the problem of phase space double-counting by construction and includes a built-in definition of a matching scale.
• This matching scale can be used to smoothly merge any partonic calculation with a parton shower.
• The best partonic calculation for a given region of phase space can be determined through physics considerations alone, independent of the algorithmic details of the merging.