[Rivet] Born and dressed level in Rivet

[Oleg Zenin]

Dear All,

Somewhat naive question on ISR/FSR interference:
would it be easy to show that FSR diagrams dominate the amplitude in a 
typical event configurations with leptons in central \eta region
and photon(s) within \Delta R < 0.1 cones around the leptons and no
large angle hard emissions?

WBR,
Oleg.


On Tue, 8 Oct 2013, David Grellscheid wrote:

> Hi Ulla,
>
>> We didn't identify the FSR photons experimentally but we unfolded to a
>> reference where a  lepton was dressed with the respective technical
>> FSR implementation.
>
> I'm sorry, I don't understand fully what you did there. The "reference" you 
> refer to is a certain MC run with a certain setup? In that case isn't your 
> unfolding dependent on that MC author's choice of where to put photon 
> emissions in that specific version of the code?
>
>> We checked that we get a similar correction in the
>> standard generators, (pythia, herwig, sherpa..).
>
> That doesn't mean it makes physical sense to split FSR from ISR photons.
>
>  David
>