#669 closed task (fixed)
Spin-correlated Born matrix elements
| Reported by: | cweiss | Owned by: | cweiss |
|---|---|---|---|
| Priority: | P4 | Milestone: | v2.6.0 |
| Component: | nlo | Version: | 2.2.2 |
| Severity: | minor | Keywords: | |
| Cc: | cweiss |
Description
For processes with final-state gluons or photons, subtraction terms require the use of a spin-correlated Born matrix element.
Change History (8)
comment:1 Changed 10 years ago by
comment:2 Changed 10 years ago by
| Cc: | cweiss added |
|---|---|
| Status: | new → assigned |
comment:3 Changed 10 years ago by
Because the use of other programs than Omega for subtraction terms is now enabled, I will have a first look into this issue.
comment:4 follow-up: 5 Changed 10 years ago by
Why do we need two different methods for subtraction terms? For validation?
comment:5 Changed 10 years ago by
Replying to jr_reuter:
Why do we need two different methods for subtraction terms? For validation?
- There seems to be a problem with our internal computations of color-correlated Born matrix elements, they fail e.g. for e+ e- -> u u~ d d~.
- It's the easiest way to obtain the spin-correlated Born matrix elements, or is Omega able to do this?
To make this clear: In a calculation, only one method is used for subtraction. But we are now able to choose between Omega and Gosam via Sindarin, and we can think of other programs, too.
comment:6 Changed 10 years ago by
| Resolution: | → fixed |
|---|---|
| Status: | assigned → closed |
This has been implemented now.
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This also true for Catani-Seymour. I didn't implement the gluon splittings here, so I didn't work on this, but was aware of that problem already in 2010.