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VUB-RECOIL  December 2009

VUB-RECOIL December 2009

Subject:

Re: Analysis status

From:

Kerstin Tackmann <[log in to unmask]>

Date:

11 Dec 2009 08:50:37 -0800 (PST)Fri, 11 Dec 2009 08:50:37 -0800 (PST)

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (54 lines)


Dear all,

should we interpret the silence as that there are no objections to what we 
are saying/proposing?

Best,
Kerstin

On Tue, 8 Dec 2009, Kerstin Tackmann wrote:

>
> Dear vub-recoilers, conveners, Vera,
>
> we have continued to look into the things we showed at the CM last month and 
> are getting to a point where we would appreciate feedback on several points. 
> It would be nice for us to have these clarified before we move on to produce 
> a measured spectrum with complete systematics, which we will need to then 
> tune the unfolding. I am hoping that settling on a strategy now that is 
> supported by the AWG might spare us duplicating work.
>
> (1)
> Is the fitting of a scaling factor for the D** component from the depleted 
> sample a strategy we are happy enough with? I did try rescaling the D*
> (see the Nov 10 entry here: 
> http://costard.lbl.gov/~kerstin/vubunf/r22/spectrum/spectrum.html), but given 
> that supposedly we know the D* better (forgetting about the spread in the 
> different results...) I think I have some preference for
> rescaling the D**, for which our knowledge is more limited.
>
> (2)
> We evaluated another set of systematics to see what the discrepancy between 
> the fit results for the B->Xclnu scaling factor is that we fit on the 
> signal-enriched and -depleted samples. We go down from 5.5 sigma (stat only) 
> to 2.3 sigma including a good number of systematics. This page
> http://costard.lbl.gov/~kerstin/vubunf/r22/spectrum/spectrum.html
> has results from a lot of the studies we performed. I am also attaching a 
> slide that shows the breakdown of the systematics on the scaling factor 
> difference. If we cannot go ahead with this at this stage, I would appreciate 
> suggestions for what other studies we should be providing.
>
> (3)
> We are currently only using FF reweighting for B->D*lnu given that mX should 
> not be very sensitive to FFs. So the only sensitivity we have comes from the 
> El cut at 1GeV. In the r18 round of the analysis the uncertainties from the 
> B->D*lnu FF were so low that we did not even quote them. However, we'd rather 
> include additional reweightings now than later if there are strong opinions 
> that reweightings for other channels are necessary.
>
> Thanks,
> Kerstin


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