Dear colleagues,
Bfys Meeting Friday 22 November in N328 and Vidyo 9:30 - 9:55 Permanent staff meeting 10:00 - 10:50 Introduction and discussion LHCb PAPER-2013-062 "Evidence for the associated production of Z bosons with open charm mesons" by Hella Snoek Deadline : 23-Nov-2013 Link : http://cds.cern.ch/record/1626663
The material can be found at http://agenda.nikhef.nl/conferenceDisplay.py?confId=2640 and will be protected by lhcb, etc.
Vidyo link in Nikhef Bfys Meeting (at Institutes->Nikhef of Friday 21 June 2013) https://indico.cern.ch/conferenceDisplay.py?confId=255991 protected by PIN 1328.
Best regards, Tjeerd
Dear all,
As a number of staff members cannot attend tomorrow at 9:30 we will POSTPONE the staff meeting and we will start at 10:00 with the paper discussion.
Please, send in your comments latest tomorrow as they have to be entered on CDS on 23-Nov-2013.
Best regards, Tjeerd
On Wed, 20 Nov 2013, Tjeerd Ketel wrote:
Dear colleagues,
Bfys Meeting Friday 22 November in N328 and Vidyo 9:30 - 9:55 Permanent staff meeting 10:00 - 10:50 Introduction and discussion LHCb PAPER-2013-062 "Evidence for the associated production of Z bosons with open charm mesons" by Hella Snoek Deadline : 23-Nov-2013 Link : http://cds.cern.ch/record/1626663
The material can be found at http://agenda.nikhef.nl/conferenceDisplay.py?confId=2640 and will be protected by lhcb, etc.
Vidyo link in Nikhef Bfys Meeting (at Institutes->Nikhef of Friday 21 June 2013) https://indico.cern.ch/conferenceDisplay.py?confId=255991 protected by PIN 1328.
Best regards, Tjeerd
Hi Hella,
I must admit that I haven't read the paper in any detail, but I have a question about what they do with the 'DTF chi2' in line 72. I went back to the analysis note, and I am not sure that the way the compute this chi2 make sense.
The only proper way to this with DTF is to create an intermediate 'mother' particle for the Z0 and D. The vertex chi2 of this mother particle tells you something about whether the Z0 and D come from the same vertex. Once you add a PV constraint to this mother particle, the chi2 also tells you something about the consistency with a PV. (I do wonder if you really want to require a PV if you actually do not need it.)
What is certainly 'wrong' is to make PV constrained fits for the D and the Z and then add up the chi2. The result is not a good chi2, except in the limit that the PV errors are infinitely small.
Cheers, Wouter
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Tjeerd Ketel -
Wouter Hulsbergen