General remarks:
* It would be nice to reflect on the physical meaning of the observed values: Is the double ration expected to be close to 1? Does one learn anything w.r.t. factorization? Are other numbers in agreement with CKM factors?
* In the analysis the charm-hadron masses are constrained to their nominal value. For the background under the peak this might lead to biases to the observed mass. Has this been checked?
* In lines 64-66 an arbitration is is performed. Why is such arbitration done? A specific mass phase space is treated different than the rest. Why not assign the event to both decays, which is what would have been done if the D and Ds analyses would have been performed in seperate analyses?
Specific comments:
* line 5: How is the sentence " .. many decays at the percent level [1]" an example of the previous sentence?
* Figure 3: The axis label is too complicated.
* line 154: Has it been proven that the momentum scale is the dominant uncertainty in absolute mass and not e.g. the opening angle systematics in the Velo (e.g. length scale of the Velo)? Typically for high mass low multiplicity decays (large opening angle) the p-scale dominates and for lower mass and high multiplicity decays (small opening angle) the Velo systematics.
* line 198-200: Was the most recent acknowledgment sentence used for the Yandex sentence?
groeten, - Marcel
On 7 February 2014 13:55, Tjeerd Ketel tjeerd@nikhef.nl wrote:
Dear all,
The paper was discussed this morning without introduction. Please, send your comments to me before Monday. I will make a group comment, which I will post on Sunday and upload on Monday afternoon (one day before the deadline).
Best regards Tjeerd
On Thu, 6 Feb 2014, Tjeerd Ketel wrote:
Dear colleagues,
Bfys Meeting Friday 7 February at 9:30 in N328 and Vidyo
9:30 - 9:55 Staff meeting (only permanent staff)
10:00 - 11:00 Discussion of PAPER-2014-002: Study of beauty hadron decays into pairs of charm hadrons and observation of Lambda_b to Lambda_c+ Ds- https://cds.cern.ch/record/1645277
The material can be found at http://agenda.nikhef.nl/conferenceDisplay.py?confId=2808 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
On Wed, 29 Jan 2014, Tjeerd Ketel wrote:
Dear all,
We just received a new paper for Nikhef. I propose to discuss it at Friday 7 February. Please, let me know if you are willing to introduce the paper.
Best regards, Tjeerd
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