[Rivet] [Rivet-svn] r2720 - trunk/src/Projections

[Andy Buckley]

On 19/10/10 10:23, blackhole at projects.hepforge.org wrote:
> Author: richardn Date: Tue Oct 19 10:23:23 2010 New Revision: 2720
> 
> Log: if more than one W candiate take the one nearest to mW rather
> than throwing the event away. Brings Herwig++ NLO into agreement with
> D0_2000_S4480767 rather than being a factor of two low.

Interesting: I based the W finder on the Z finder, for which I thought
that the rate of multiple candidates inside the mass window was
extremely low. This suggests that ~half of the W events lead to multiple
candidates: I'm surprised. And also the weight counting in that analysis
can't have been spot-on if vetoing multi-candidate events was affecting
the overall normalisation. Maybe worth changing ZFinder to have the same
behaviour, i.e. choose closest-to-mZ. Frank?

Andy

-- 
Dr Andy Buckley
SUPA Advanced Research Fellow
Particle Physics Experiment Group, University of Edinburgh