[Rivet] electroweak results used to tune/validate theory

[Andy Buckley]

Heidi Schellman wrote:
> One issue here - we do use photos in our MC, but that is partially 
> because, we also have real photon radiation from the detector - which is 
> almost certainly a larger effect.  At least for the total Z cross 
> section, we found that if we use a .2 cone for electrons in D0, photos 
> or not photos made very little effect in our results.

Gavin did the detailed study, so he can probably comment more
knowledgeably than I, but the effect was around 5% for for Z pT peak
position, which is sensitive to low pT effects like QED resummation. I
would expect that inclusive quantities like total cross-section are
relatively unaffected, but for Monte Carlo tuning the differential ones
are essential.

> And we are going to quote for our fiductial PT, eta range, as well as 
> for the full extrapolated range.

Excellent! I hope it's clear that what we're advocating is publishing
purely detector-corrected data "as well as" any extrapolations or theory
unfoldings... rather than "instead of"!

Andy

-- 
Dr Andy Buckley
Institute for Particle Physics Phenomenology
Durham University
0191 3343798 | 0191 3732613 | www.insectnation.org