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

[Lars Sonnenschein]

Hello Emily
thank you for your feedback.
Indeed the paper has two formulas for the ratio:
a theoretical one which corresponds to your formula below and an 
experimental one which looks like:

R_exp(pT) = [dsigma/dpt(W) / dsigma/dpt(Z)] * Mw/Mz * B(Z->ee)/B(W->enu)

where Mw/Mz = 0.88 and B(Z->ee)/B(W->enu) = 0.3 roughly.
The later formula I use for the ratio, i.e. scale the diff. xsec. ratio
by the constant factors given above.

Now I could scale the Z pT before filling the histo according to the 
theoretical formula, but that would not alter the W pT spectrum.

Though I will try to see the difference in the ratio.

Now, since I select electrons (and  a neutrino in case of W) should the 
formula look like R_th = dsigma/dpt(W) / dsigma/[d(pt(Z)*Mw/Mz)] * 
B(Z->ee)/B(W->enu)
to take the branching ratio differences into account?

	Lars


On Mon, 6 Oct 2008, Emily Nurse wrote:

> Hi Lars,
> 
> Its hard to see how off the W pT plot is, can you compare it to the data so we
> can see?
> As for the ratio, its more obvious that its going the wrong way compared to
> the data.
> In the paper they are measuring dsigma/dpt(W) / dsigma/[dpt(Z)*Mw/Mz]
> ie/ they scale the Z pT by the ratio of the W and Z masses, see page 20 and 21
> of my 1st year PhD transfer report for more details, and comparisons of the
> data with Herwig:
> http://www.hep.man.ac.uk/u/emily/1styear.ps
> 
> It should also be explained in the paper. Are you doing this in the routine?
> 
> Cheers,
> Emily.
> 
> 
> On 6 Oct 2008, at 08:19, Lars Sonnenschein wrote:
> 
> > Hi
> > I have put some plots for the D0 2001 WpT <-> ZpT analysis at
> > http://www-d0.fnal.gov/~sonne/D0_2001_S4674421/
> > 
> >      Lars
> > 
> > 
> > On Fri, 3 Oct 2008, Andy Buckley wrote:
> > 
> > > Hi everyone,
> > > 
> > > Our next Rivet etc. phone meeting will take place on Monday at 2pm (UK
> > > time). Note that it's earlier than last week - this will be the normal
> > > time from now on.
> > > 
> > > Once again, we'll be using the DESY phone conference system: phone
> > > 
> > > +49 40 8998 1390
> > > 
> > > then enter conference code 74838 ("rivet") followed by #.
> > > 
> > > From the UK, Telediscount can be useful if your office restricts
> > > international dialling: 0844 861 3535.
> > > 
> > > Have a good weekend!
> > > Andy
> > > 
> > > _______________________________________________
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> > > Rivet at projects.hepforge.org
> > > http://www.hepforge.org/lists/listinfo/rivet
> > > 
> > 
> > -- 
> > 
> > 
> > ________________________________
> > Lars Sonnenschein
> > ________________________________
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> 

-- 

 
________________________________
Lars Sonnenschein    
________________________________
Home Institution:
PH/TH 53/1-052 
CERN
CH-1211 Geneve 23
Switzerland
Tel.:+41(22)767-2801
--------------------------------
________________________________
FNAL:
D0, PK151
Mailstop #352
Fermilab, P.O.Box 500
Batavia, IL 60510-500
USA
Tel.: +1(630)840-8740
________________________________