- #1

ChrisVer

Gold Member

- 3,379

- 461

**normalized**to the NNLO cross sections?

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- A
- Thread starter ChrisVer
- Start date

- #1

ChrisVer

Gold Member

- 3,379

- 461

- #2

- 129

- 12

normalizedto the NNLO cross sections?

The Meaning on that statement is that the total number of events is normalized to the calculated NNLO inclusive cross section.

The production itself is done at a lower order (LO or NLO), so the shapes of all the distrubutions reflect these lower orders.

But the total normalization is accurate to NNLO.

- #3

ChrisVer

Gold Member

- 3,379

- 461

So the events get scaled by something like this:

[itex]\frac{\sigma_{LO/NLO}}{\sigma_{NNLO}}[/itex]?

[itex]\frac{\sigma_{LO/NLO}}{\sigma_{NNLO}}[/itex]?

- #4

- 129

- 12

So the events get scaled by something like this:

[itex]\frac{\sigma_{LO/NLO}}{\sigma_{NNLO}}[/itex]?

The total number of events are normalised by [itex]\frac{\sigma_{NNLO}}{\sigma_{LO/NLO}}[/itex]

- #5

- 129

- 30

[itex] \sigma_{nnlo}/\sigma_{nlo} d \sigma_{nlo} /dX [/itex]

Where X is the observable. Practically though, POWHEG samples are not actually NLO accurate for distributions, since it's NLO+PS (not fixed order).

Share: