Ha Rob, Tjeerd, Attached are my comments. Cheers, Niels

On Fri, 7 Sep 2012, Marcel Merk wrote:

Dear all, I can unfortunately not be present at the meeting. I give my (general) comments below.

Here are my comments/questions:

What does the measured number *mean*? A) The CP asymmetries vary strongly over the Dalitz plot phase space. Does the integrated number give the CP asymmetries over the integral of the Dalitz plot after kinematical cuts corresponding to the LHCb acceptance and reconstruction, or is there some (MC-) extrapolation involved?

B) The more I thought of it, the less I understand. How can we ever interpret these large asymmetries in areas of the Dalitz plot in terms of physics parameters? Perhaps I just confused myself...

On line 113 I read that the background is calculated on the total event sample and then divided equally to the two CP samples. Why is it not determined independently for the two CP samples? At least one could do this and assign a systematic to the assumption that it is equal.

3.  On line 131 it is stated that the K+K- asymmetry dependence on momentum is weak. Do we have an experimental prove of that?

4.  Systematics: I presume there is a magnet-up vs magnet down cross check done that at least shows there is no statistical significant difference for the asymmetries. It is not mentioned.

I like the cross check of lines 160 - 166.

6.  As far as I saw the vertical "empty bands" (or "white bands") in the Dalitz plots in fig 3 are not explained in the text. Did I miss it?

cheers and have a fruitfull discussion,

• Marcel

On 5 September 2012 23:03, Tjeerd Ketel tjeerd@nikhef.nl wrote: Bfys Meeting at Friday 7 September at 14:00 h on EVO

  14:00 Discussion of conference note LHCb-conf-2012-028
        Title:  Evidence for CP violation in B+- -> pi+- pi+ pi- and
        B+- -> K+ K- pi+- decays.
        The summary will be given by Rob Lambert.
  15:00 End

  Analysis note: ANA-2012-077
  Deadline: 11-Sep-2012
  Link: https://cdsweb.cern.ch/record/1475804 [cdsweb.cern.ch]
  Twiki:https://twiki.cern.ch/twiki/bin/view/LHCbPhysics/Bu2KKpiAndBu2pipipiSumme>
  012 [twiki.cern.ch]

  The unusual time is chosen because of Piet Mulders'
  Lectures at 10:30.

  I am at CERN for the VELO this week and did not reserve a room at Nikhef.
  At CERN the EVO meeting will be broadcasted from Rob's room.
  ===================================================================
  EVO:
  Title:          Nikhef
  Description:    Bfys Meeting 14:00-15:00 h
  Community:      LHCb
  Password:       N328

  Meeting Access Information:
  - Meeting URL
          http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MeMMMu2e28D8DB9v9nDv9e

  - Password: N328
  - Phone Bridge
          ID: 578 2011
          Password: 4119

  EVO Phone Bridge Telephone Numbers:
  ---------------
  - Switzerland (CERN, Geneva)
          +41 22 76 71400

  - Netherlands (Nikhef, Amsterdam)
          +31 20 7165293
          Dial '2' at the prompt

  - Skype (tm) (World-wide)
          evo.phone
          See:
    http://evo.caltech.edu/evoGate/Documentation/extclient/skype/skype.html
  ===================================================================
  _______________________________________________
  Bfys-physics mailing list
  Bfys-physics@nikhef.nl
  https://mailman.nikhef.nl/mailman/listinfo/bfys-physics

Dear all,

I hesitate to try to setup the video in N328, but I can offer the friends at Nikhef to attend the bfys meeting in my office...!

Cheers, Niels

On Fri, 7 Sep 2012, Tjeerd Ketel wrote:

Bfys Meeting at Friday 7 September at 14:00 h on EVO

See: http://agenda.nikhef.nl/conferenceDisplay.py?confId=2081 with slides and first comments. The are protected with lhcb and the usual pw.

14:00 Discussion of conference mote LHCb0conf-2012-028 Title:  Evidence for CP violation in B+- -> pi+- pi+ pi- and B+- -> K+ K- pi+- decays. The summary will be given by Rob Lambert. 15:00 End

Analysis note: ANA-2012-077 Deadline: 11-Sep-2012 Link: https://cdsweb.cern.ch/record/1475804 [cdsweb.cern.ch] Twiki:https://twiki.cern.ch/twiki/bin/view/LHCbPhysics/Bu2KKpiAndBu2pipipiSumme%3E 012 [twiki.cern.ch]

I am at CERN for the VELO this week, and did not reserve a room at Nikhef. The EVO meeting will be opened from Rob's PC at CERN. =================================================================== EVO: Title: Nikhef Description: Bfys Meeting 14:00-15:00 h Community: LHCb Password: N328

Meeting Access Information:

• Meeting URL http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MeMMMu2e28D8DB9v9nDv9e

• Password: N328

• Phone Bridge ID: 578 2011 Password: 4119

EVO Phone Bridge Telephone Numbers:

• Switzerland (CERN, Geneva) +41 22 76 71400

• Netherlands (Nikhef, Amsterdam) +31 20 7165293 Dial '2' at the prompt

• Skype (tm) (World-wide) evo.phone See:

http://evo.caltech.edu/evoGate/Documentation/extclient/skype/skype.html

--

Hi Tjeerd,

A few edits, and a edited version attached.

I think Marcel's comment which you place at item (1) is really a restatement of item (2), and so I combine (1) and (2) in the attached version.

I think you missed the point on the odd statement of certain asymmetries which are not required, and so I add another (longer) point for that.

There were also a couple of cut-and-paste errors, with a missing "not" or some such from the sentence, which I think I've corrected.

Could you take another look at the attached file?

Thanks,

Rob

------------------------------------------ Robert Lambert FOM-VU-NIKHEF-Bfys LHCb Email: rob.lambert@cern.ch ------------------------------------------ CERN, 13-1-018 Tel: +41 22 767 4024 Fax: +41 22 766 8109 ------------------------------------------ Nikhef N241 Tel: +31 20 592 2131 Fax: +31 20 592 5155 ------------------------------------------

________________________________________ From: Tjeerd Ketel [tjeerd@nikhef.nl] Sent: 09 September 2012 22:20 To: bfys-physics@nikhef.nl Cc: Rob Lambert Subject: Comments on LHCb-CONF-2012-028

Dear all, I collected the comments of Rob, Marcel, Krystof, Niels and myself. Please, check if I missed remarks or changed them to badly.

Monday evening they will be uploaded by me.

Best regards, Tjeerd