Dear colleagues,

Bfys Meeting Friday 5 February at 9:30 in N328 and Vidyo

9:30 - 9:55 Staff meeting (permanent staff only)

10:00 - 10:45 "Penguin Pollution in phi_s" by Vasileois Syropoulos

10:45 - 11:30 Introduction and discussion of LHCb-PAPER-2016-001 "Search for Bc decays to the p pbar pi final state" by Niels Tuning

Material (and also Vidyo link) at https://indico.nikhef.nl/conferenceDisplay.py?confId=356 protected by PIN 1328.

Direct Vidyo link on the Nikhef Indico (above) equivalent to: http://vidyoportal.cern.ch/flex.html?roomdirect.html&key=LCjLrDFb9I8L7Eb... protected by PIN 1328.

Best regards, Tjeerd

PS wrong subject title and a wrong name. Sorry. On Thu, 4 Feb 2016, Tjeerd Ketel wrote:

Dear colleagues,

Bfys Meeting Friday 5 February at 9:30 in N328 and Vidyo

9:30 - 9:55 Staff meeting (permanent staff only)

10:00 - 10:45 "Penguin Pollution in phi_s" by Vasileois Syropoulos

10:45 - 11:30 Introduction and discussion of LHCb-PAPER-2016-001 "Search for Bc decays to the p pbar pi final state" by Jacco de Vries.

Material (and also Vidyo link) at https://indico.nikhef.nl/conferenceDisplay.py?confId=356 protected by PIN 1328.

Direct Vidyo link on the Nikhef Indico (above) equivalent to: http://vidyoportal.cern.ch/flex.html?roomdirect.html&key=LCjLrDFb9I8L7Eb... protected by PIN 1328.

Best regards, Tjeerd

On Fri, 29 Jan 2016, Tjeerd Ketel wrote:

...

Dear all,

We have a paper for Nikhef to comment on. Please volunteer to introduce it. We may discuss it after Vasileios' presentation on Friday 5 February.

Link            : https://cds.cern.ch/record/2127555

Hi Niels,

Here are mine.

Physics: you use two samples and hence only half of the data for training. Could you have gained more with n-folding?

L.138: do you believe these two acceptances within the uncertainties you give? You then re-use these statistical uncertainties as systematic. I am sure Pythia gets the \Bc/\Bu production ratios more wrong than that. Have you calibrated to the \Bc production paper? There should be a systematic coming from this calibration.

First paragraph: lacks a bit of structure. It's a collection of facts, but the reader is wondering what is relevant and how it's connected to what you measure. L.2: spurious space before footnote. Move footnote to L.66, where you need it. Fig.1: extracted -> determined. L.79: events -> candidates L.91 and elsewhere : Fig.~\ref{...} L.110: spurious ! L.122: each candidate, depending on its location in the ... L.126: I think <a> is more commeon to mean average than \overline{a}. Or just write "average of ... on the ROI". Generally there's a lot of maths that could be turned into words. L.140-144: This collection of numbers is somewhat boring. Is it needed? Systematics : you should explain in words how these numbers are obtained. Maybe Section 5 and 6 could be merged, as you talk about corrections in both. Table 1: 3 -> 3.0. L.167: @ -> at [2] $B_c$

Cheers,

Patrick

On 05/02/16 11:07, Niels Tuning wrote:

Dear all,

Please send me your comments by Wednesday morning. (I attach already my comments, with Wouters coments on the J/psi constraints already added.).

My main points are below; let me know if you know the answers already...

Cheers, Niels

General

• Given the similarities with the Bc->KKpi analysis, was it considered to merge the two analysis in one paper?

Questions

1. L.11 Is there a paper you can refer to concerning the sensitivity

to the Beyond the Standard Model physics?

2. L.70/71 We do not understand what the different production fractions

have to do with the fiducial cuts?

3. L.167 We tried to get a back-of-the-envelop limit:

if you measure 0 events, then the upper limit is ~4 events? Then we get the limit : (eff_u/eff_c)*(4/1644)*BR(B+) = 6 x 10^-9, rather than 3.6 x 10^-8 ?

4. L.167 Did you use the J/psi mass constraint and/or known J/psi

lineshape to achieve optimal sensitivity in the Rp^J/psi limit?

5. Fig.5 Why would you plot p-values for negative Rp values ?

On Fri, 29 Jan 2016, Tjeerd Ketel wrote:

...

Dear all,

We have a paper for Nikhef to comment on. Please volunteer to introduce it. We may discuss it after Vasileios' presentation on Friday 5 February.

Best regards, Tjeerd

---------- Forwarded message ---------- Date: Fri, 29 Jan 2016 16:07:00 +0000 From: George Lafferty george.lafferty@manchester.ac.uk To: LHCb General mailing list lhcb-general@cern.ch Subject: First circulation of publication draft for PAPER-2016-001, Search for $B_c$ decays to the $p \bar{p}\pi$ final state Resent-Date: Fri, 29 Jan 2016 17:08:36 +0100 Resent-From: lhcb-general-dynamic@cern.ch

Dear Colleagues,

A draft paper is available for your comments:

Title : Search for $B_c$ decays to the $p \bar{p}\pi$ final state

Journal : PLB Contact authors : Adlene_Hicheur Reviewers : Jibo_He (chair), Lucio_Anderlini EB reviewer : Brian_Meadows EB readers : David_Ward, Justine_Serrano Analysis note : ANA-2015-035 Deadline : 12-Feb-2016 e-group : lhcb-paper-2016-001-reviewers Link : https://cds.cern.ch/record/2127555 Authors : LHCb Twiki : https://twiki.cern.ch/twiki/bin/view/LHCbPhysics/BcToPPbarPi

The following institutes are requested to make institutional comments: LAPP__Annecy-Le-Vieux__France Tsinghua_University__China Roma_La_Sapienza__Roma__Italy PUC-Rio__Rio_de_Janeiro__Brazil EPFL__Lausanne__Switzerland NIKHEF__Netherlands

Please send any comments via the CDS system. It is the responsibility of the contact authors to provide replies to all comments made. Subsequent modifications to the draft will be made in consultation with the reviewers and during the EB reading. Following this, there will be a final meeting of the editorial board, with contact authors and reviewers present, when final decisions will be made. As the last step, the collaboration will be given a final opportunity to comment during a “silent approval” period.

You can find all paper and conference report drafts open for comments via the EB web-page, by clicking on Current Drafts:

http://lhcb.web.cern.ch/lhcb/lhcb_page/collaboration/organization/editorial_...

rd/default.html

Best regards, George

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