============================================================ Summary of the Friday 23 September 2011 Bfys Meeting at Nikhef ============================================================ Present: Fabian Jansen, Wouter Hulsbergen, Niels Tuning, Gerhard Raven, Eddy Jans, Siim Tolk, Manuel Schiller, Francesco Dettori, Serena Oggero, Rob Lambert, Marcel Merk, Tjeerd Ketel. Connected via EVO: Roel Aaij.

News (Marcel): - Face transitions. New members are welcomed: Ali Suvayu, Siim Tolk, Manuel Schiller, Francesco Dettori, Rob Lambert. - Gerhard Raven is appointed full professor at the VU university. - The 'Najaarsbijeenkomst' on 4 November in Lunteren will have contributions by Serena and Roel. - The Amsterdam Particle Physics Symposium (APPS 2011) will take place during 30/11-2/12 and will have three talks by LHCb. - The review of Nikhef by NWO went very well this week. - The Beauty 2011 proceedings are almost complete. - Topics for the coming Bfys Meetings: - Zootuple analyzes on 14 October (Manuel) - LHCb-PAPER-2011-021, Bs->K*K* (still looking for a presenter)

CP violation in D->h-h+ analysis: Fabian explained the analysis (see the Nikhef agenda page). There was a lot of discussion.

Please, repeat me your main comments or suggestions, if you want them to be recorded.

Best regards, Tjeerd ============================================================

Bfys Meeting at Friday 14 October 10:00-11:00 hours in N328

Dear Colleagues,

I have booked a Bfys Meeting in N328 Friday 14 October 10:00-11:00 hours.

News by MARCEL MERK N328 and EVO: 10:00-10:20 Zootuple by MANUEL SCHILLER N328 and EVO: 10:20-11:00

Best regards, Tjeerd

=================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1645 ===================================================================

On 10/13/2011 09:43 AM, Tjeerd Ketel wrote:

Dear Colleagues,

I have booked a Bfys Meeting in N328 and on EVO Friday 14 October 10:00-11:45 hours.

10:00 News by MARCEL MERK, 10:20 Zootuple by MANUEL SCHILLER, 11:00 The decay Bs to K*K* by PATRICK KLOPPENBURG.

Koppenburg!

Best regards, Tjeerd

You can already read about it in the attachments at the Nikhef page

Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1645 ===================================================================

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Dear Colleagues,

I have booked a Bfys Meeting in N328 and on EVO Friday 28 October 9:00-11:00 hours.

9:00 Rehearsal NNV-Lunteren and Discussion Serena Oggero 10:00 Rehearsal NNV-Lunteren and Discussion Roel Aaij (by EVO)

Best regards, Tjeerd

=================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1654 ===================================================================

You have BOOKED a meeting in EVO (http://evo.caltech.edu).

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Hoi Tjeerd,

I have focussed on the multiplicity paper. I'm not sure how you want to do the discussion but I could mention some comments (no transparencies). Or do you propose to go just through the papers, page by page? groeten, - Marcel

On 2 November 2011 10:39, Tjeerd Ketel tjeerd@nikhef.nl wrote:

Bfys Meeting at Monday afternoon 7 November 14:00-16:00 hours in N328

Dear Colleagues,

I have booked a bfys meeting in N328 at 7 November 14:00-16:00 hours. The subject is: "Discussion and comments on drafts of LHCB-PAPER-2011-011 and -019".

The following drafts are assigned to Nikhef and Vrije Universiteit and should therefore be discussed at short notice.

14:00 Measurement of Charged Particle Multiplicities in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV in the forward region, LHCB-PAPER-2011-011-001 (Version No. 1). The deadline for comments is 08 Nov 2011.

15:00 A measurement of the cross-section ratio $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ for prompt $\chi_{c}$ production at $sqrt{s} = 7$ TeV in LHCb, LHCB-PAPER-2011-019-001 (Version No. 1). Deadline for comments is 03 Nov 2011 (I will annouce our comments).

After the discussions we will collect group comments to be submitted. Please, sent your comments in advance if you have them already.

Apart from the group comments you are, of course, invited to submit your private comments on any draft you read, including the ones we discuss at our institute.

Best regards, Tjeerd

PS I am looking for people who want to introduce one of the two papers and start its discussion.

=================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1661 =================================================================== You have BOOKED a meeting in EVO (http://evo.caltech.edu).

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Bfys Meeting at Friday morning 18 November 9:45-10:45 hours in N328

Dear Colleagues,

I have booked a bfys meeting in N328 and EVO at 18 November 9:45 to 10:45 hours.

9:45 Rob Knegjens, The effective lifetime of B0_s. You can read about this work with Robert Fleischer and Giulia Riccardi in http://arxiv.org/abs/1110.5490

Best regards, Tjeerd

=================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1656 =================================================================== You have BOOKED a meeting in EVO (http://evo.caltech.edu).

Title: Nikhef Description: Bfys Meeting 9:45-10:45 Community: LHCb Password: n328

Meeting Access Information: - Meeting URL http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MDMaM8292iDMD8999sD99D

- Password: n328 - Phone Bridge ID: 431 4000 Password: 6287

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 ===================================================================

Dear All,

Rob will actually discuss effective Bs decay lifetimes following closely this paper:

http://arXiv.org/abs/arXiv:1109.5115

Cheers,

Robert

On Nov 14, 2011, at 16:20 , Tjeerd Ketel wrote:

Excuse me. I forgot to change the Subject title. Tjeerd

On Mon, 14 Nov 2011, Tjeerd Ketel wrote:

...

Bfys Meeting at Friday morning 18 November 9:45-10:45 hours in N328

Dear Colleagues,

I have booked a bfys meeting in N328 and EVO at 18 November 9:45 to 10:45 hours.

9:45 Rob Knegjens, The effective lifetime of B0_s. You can read about this work with Robert Fleischer and Giulia Riccardi in http://arxiv.org/abs/1110.5490

Best regards, Tjeerd

=================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1656 =================================================================== You have BOOKED a meeting in EVO (http://evo.caltech.edu).

Title: Nikhef Description: Bfys Meeting 9:45-10:45 Community: LHCb Password: n328

Meeting Access Information:

• Meeting URL http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MDMaM8292iDMD8999sD99D

• Password: n328

• Phone Bridge ID: 431 4000 Password: 6287

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:

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Dear Master and PhD students of B-physics,

Tomorrow a few 3rd year Physics students of the VU University will visit Nikhef. We will close the visit with a short meeting at 11:40-12:00 in H320. It would be nice if you could join then to discuss with these students.

Best regards, Tjeerd

============================================ Programma Openhuisbezoek van 3N-studenten VU Woensdagochtend, 9-12 uur, 23 november 2011 ============================================ Nikhef, Sciencepark 105, 1098XG. Bereikbaar met bus 40 en 240 van Amstelstation. Nikhef receptie tel: 020-5922000.

Vanaf 8:45 Verzamelen in de hal bij de Nikhef receptie. 9:00 Vergaderkamer H320 9:05 Welkom bij het Nikhef, Marcel Merk 9:20 B-fysica, Marcel Merk 9:50 Gravitatiefysica, Chris van den Broeck ----- Excursies (20 minuten) 10:20 Trillingsvrije tafels, Eric Hennes 10:40 Grid computing, Dennis van Dok 11:00 Rietjesdetectoren in de cleanroom, Niels Tuning 11:20 Pixeldetectors, Panos Tsopelas ----- Nabespreking 11:40 Weer in H320 12:00 Einde ============================================ Aangemelde VU-studenten: Ruud vd Beek Tim Berrier Wouter Buijsman Frank Cozijn Laura Dreissen Erik Hogenbirk Matthijs Jansen Stacy Mannes Claudio Pollice Cyriana Roelofs Martijn Stoffels ============================================

Bfys Meeting at Friday morning 25 November 10-11 hours in N041

Dear Colleagues,

I have booked a Bfys Meeting in N041 at 25 November 10-11 hours.

10:00 Fabian Jansen 'Single-particle efficiencies from multi-particle channels', about his PhD thesis, which he will defend December 16th.

Best regards, Tjeerd

PS EVO is not foreseen as the room has no Polycam videoconference system. On request a poor quality (wireless and Duet speakerphone) EVO can be arranged. =================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1674 ===================================================================

Dear Colleagues,

I have booked a bfys meeting in N328 and EVO at 21 November 14:00-15:30 hours.

14:00 Wouter Hulsbergen, Measurement of the CP-violating phase phi_s in the decay B_s to J/psi phi. LHCB-PAPER-2011-021-001 This paper is open for comments until 24 November. 15:00 Tjeerd Ketel Discussion of Conference Note 2011-060-001 to be reviewed by Nikhef. 'Measurement of $\Xi_b^−$ and $\Omega_b^-$ masses using an integrated luminosity of 576 pb$^-1$ of $pp$ collisions' The deadline for comments is 22 Nov 2011.

Best regards, Tjeerd

=================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1664 =================================================================== You have BOOKED a meeting in EVO (http://evo.caltech.edu).

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Bfys Meeting at Friday 9 December 9.30 h in N328 and EVO

Dear Colleagues,

I have booked a Bfys Meeting in N328 and EVO on Friday 9 December 9.30 h to rehearse two presentations for the Nikhef Annual Scientific meeting: 9:30 Charm Physics (25') by Alexandr Kozlinskly 10:15 Search for long-lived unstable particles (25') by Victor Coco

The other two presentations will be sent around for comments: Introduction and Status (15') Marcel Merk Physics overview (25') Gerhard Raven

Best regards, Tjeerd

=================================================================== Nikhef Calendar: http://agenda.nikhef.nl/conferenceDisplay.py?confId=1677 =================================================================== You have BOOKED a meeting in EVO (http://evo.caltech.edu).

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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 ===================================================================

Dear all,

I will submit these attached comments about the chi-sub-c cross section ratio tomorrow (Tuesday) at 13 h. I hope I included your comments this afternoon in correctly. Please, check it.

Best regards, Tjeerd

Hi Thomas,

Thanks very much for collecting the comments. Two comments on your comments ;-)

1. About the unfolding. I think I understand why they do it, but I'm nervous about the numerical effect it has on the multiplicity distribution without assigning systematics. I propose instead of "it is not clear why the unfolding is applied" a comment like: "It is not clear how much the unfolding numerically contributes to the multiplicity distribution. Does it change a lot with respect to simple scaling? Is there no systematics assigned to the unfolding assumption?"

2. KNO (Koba, Nielsen, Oleson) scaling states that the multiplicity distribution expressed in the KNO variable is independent of collision energy. What I remember from my undergraduate study is that a modified version of this (KNO-G scaling) leads to fact that multiplicity distributions can be described as universal negative binomial distributions, which is still useful today. So I have no objection against plotting distributions versus the KNO variable (it is a simple one anyway). It could just use a few words of introduction *why* this is being done. (I had to look up my master thesis to refresh my memory of this!)

cheers, - Marcel

On 8 November 2011 12:12, thomas thomas.bauer@nikhef.nl wrote:

Dear all,

please find in the attachment a summary of the comments made yesterday wrt the Multiplicity paper.

The deadline for submitting comments is today. sorry for being so late. I hope i have included all the relevant comments.

I will submit the comments today at 17:00

Thanks in advance for corrections and additions.

Kind regards, Thomas

-- Thomas S. Bauer

NIKHEF email: thomas @ nikhef.nl P.O. Box 41.882 tel. : (+31)-20- 5 92 20 50 1009 DB Amsterdam, The Netherlands fax : (+31)-20- 5 92 51 55

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