[Rivet] Validation & tuning phone meeting, Monday 29th Sept, 4pm (UK)

[Andy Buckley]

Lars Sonnenschein wrote:
> Hello Andy
> the Z->ee branching ratio is a factor of about three smaller than 
> for W->enu.
> The table in the paper (hep-ex/0107012) shows in each pT bin that the Z 
> xsec is about one order of magnitude smaller.
> 
> The Z pT spectrum looks more or less alright. Overall the entries are 
> about 30% lower than in data.
> Similar for the W xsec (apart of the too steeply falling pT distribution)

Thanks... I wasn't sure if the branching ratio was being included in the
ratio normalisation.

This is definitely worth following up - if the run with Herwig gives
good agreement then there is a significant problem with Pythia's W+jets
ME. Let's hope that's not the case... surely someone would have noticed!

Andy

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