bfys-physics

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520 discussions

[Bfys-physics] Bfys Meeting Friday 23 November
by Tjeerd Ketel 26 Nov '12

26 Nov '12

Bfys Meeting Friday 23 November at 10h in N328 and continued at 14h in H331 10:00 Introduction and discussion on LHCB-PAPER-2012-040 by Wouter "Amplitude analysis and the branching fraction measurement of Bbar0s to JpsiK+K-"a (1h) 14:00 Rehearsals by Serena and Jeroen for the "Discrete" conference is Lisbon. Best regards, Tjeerd Paper: http://cdsweb.cern.ch/record/149418 ========================================================= http://agenda.nikhef.nl/conferenceDisplay.py?confId=2191 ========================================================= You have BOOKED a meeting in SeeVogh Research Network (http://research.seevogh.com). Title: Nikhef Description: Bfys Meeting 10-11h and 14-15h Community: LHCb Password: n328 Meeting Access Information: - Meeting URL SeeVogh R.N. http://research.seevogh.com/join?meeting=MsMiMI2u2eDsDM9D92Dt9s EVO International http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MsMiMI2u2eDsDM9D92Dt9s - Password: n328 - Phone Bridge ID: 613 0930 Password: 6287 =========================================================

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[Bfys-physics] Bfys Meeting Friday 23 November at 9:30 and 13:30
by Tjeerd Ketel 20 Nov '12

20 Nov '12

Bfys Meeting Friday 23 November at 9:30 in N328 and continued at 13:30 in H331 In N328 9:30 Introduction and discussion on LHCB-PAPER-2012-040 by Wouter "Amplitude analysis and the branching fraction measurement of Bbar0s to JpsiK+K-" (1h) Please, read this paper in advance. 10:30 Introduction LHCB-PAPER-2012-045 by Niels (30') "Analysis of the resonant components in Bbar0 -> J/psi pi+pi-" In H331 13:30 Rehearsals by Serena and Jeroen for the "Discrete" conference is Lisbon. 13:30 "Very rare decays" by Serena Rare lepton decays of the B(s), D and K mesons are sensitive probes of New Physics. In particular, the search for the decays B(s) -> mu+mu- provides information on the presence of new (pseudo-)scalar particles. LHCb is well suited for these analyses due to its large acceptance and trigger efficiency, as well as its excellent invariant mass resolution and lepton identification capabilities. Results on these searches using data collected by LHCb in 2011 and 2012 are presented. 14:10 "Measurement of the CP violating phase in Bs mixing" by Jeroen. The determination of the CP-violating phase phi_s in B_s -> J/psi phi decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. We present the world's best measurement of phi_s and the first observation of a non-zero Delta Gamma_s based upon 1.0 fb−1 of data collected at LHCb during 2011. phi_s can also be measured using the predominantly CP-odd B_s -> J/psi pi pi decay mode. We present this measurement and the combination of phi_s from both J/psi phi and J/psi pi pi decay modes. Additionally we present first results on other B_s decay modes, potentially interesting for complementary measurements of phi_s, such as B_s -> phi phi and B_s → J/psi K∗0 decays. Best regards, Tjeerd Paper Jpsi KK : http://cdsweb.cern.ch/record/1494148 Paper Jpsi pipi: http://cdsweb.cern.ch/record/1494673 ========================================================= http://agenda.nikhef.nl/conferenceDisplay.py?confId=2191 ========================================================= You have BOOKED a meeting in SeeVogh Research Network (http://research.seevogh.com). Title: Nikhef Description: Bfys Meeting 9:30-11 and 13:30-14:40 Community: LHCb Password: n328 Meeting Access Information: - Meeting URL SeeVogh R.N. http://research.seevogh.com/join?meeting=MsMiMI2u2eDsDM9D92Dt9s EVO International http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MsMiMI2u2eDsDM9D92Dt9s - Password: n328 - Phone Bridge ID: 613 0930 Password: 6287 =========================================================

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[Bfys-physics] Our comments on LHCb-PAPER-2012-044
by Tjeerd Ketel 19 Nov '12

19 Nov '12

Dear all, I collected comments from Patrick, Wouter, Antonio and myself in the attached file which I will upload at 23h tonight at the Cern Document Server before the deadline of 24h. Please, have a look and correct if necesssary. Best regards, Tjeerd PS Sorry for the delay in compilation.

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[Bfys-physics] Bfys Meeting Friday 16 November at 10h in N328
by Tjeerd Ketel 15 Nov '12

15 Nov '12

Bfys Meeting Friday 16 November at 10h in N328 Discussion on 10:00 LHCB-PAPER-2012-044 "Exclusive J/psi and psi(2S) Production at sqrt(s) = 7 TeV" As no volunteer offered to introduce the subject, I propose to sit together with those who read (part of) the paper and collect comments. I got them already from Patrick and put them protected on the Nikhef agenda. Before the deadline on 19 November I will collect more comments and send them around on Monday morning for a last check with the Nikhef group. Best regards, Tjeerd Paper: https://cdsweb.cern.ch/record/1491625?ln=en ========================================================= http://agenda.nikhef.nl/conferenceDisplay.py?confId=2189 ========================================================= You have BOOKED a meeting in SeeVogh Research Network (http://research.seevogh.com). Title: Nikhef Description: Bfys Meeting 10:00-10:50 h Community: LHCb Password: n328 Meeting Access Information: - Meeting URL SeeVogh R.N. http://research.seevogh.com/join?meeting=MvM2Ml2a2tDeDu9M9iDe9v EVO International http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MvM2Ml2a2tDeDu9M9iDe9v - Password: n328 - Phone Bridge ID: 612 5732 Password: 6287 =========================================================

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Re: [Bfys-physics] [Nikhef-wide] Celebrating the evidence for the Bs->mumu decay in LHCb
by Patrick Koppenburg 13 Nov '12

13 Nov '12

... changing lists. As was pointed out in the seminar this morning, the space for susy has actually increased compared to our previous limit. Cheers, Patrick On 11/13/2012 01:39 PM, Marcel Merk wrote: > English version follows below the dutch > > Beste collegas en vrienden , > > Het LHCb experiment heeft bewijs gewonden voor het Bs->mumu verval, > hetgeen hiermee het meest zeldzame waargenomen B verval is. > (Voor de preprint zie: http://arxiv.org/abs/arXiv:1211.2674) > > De significantie van het bewijs is 3.5 sigma. Hiermee heeft het Standaard > Model voldaan aan zeer een stringente test. > Ook al zijn hierdoor het aantal mogelijkheden van supersymmetry > gereduceerd, > het resultaat betekent geenszins een uitsluiting van supersymmetrie. > > Zowel de experimentele en theoretische b-fysica groepen van het Nikhef > hebben > een centrale rol gespeeld in dit resultaat en de vergelijking met theorie. > > Bij deze nodigen we jullie uit voor een drankje in de hal vandaag > (dinsdag) > om thee-tijd (15h00). > > De b-fysica group. > > ---------------------------------------------------------------------------------------------------- > > Dear colleagues and friends, > > The LHCb experiment has announced 3.5 sigma evidence for the very rare > decay > of Bs->mumu, the rarest B-decay observed sofar. > (preprint: http://arxiv.org/abs/arXiv:1211.2674) > > The observation of this decay implies that the Standard Model has > passed an extremely > challenging test. Although the possibilities for supersymmetric models > are reduced, > supersymmetry is certainly not ruled out. > > Both the experimental and theory groups at Nikhef have played a > central role in this > result and the comparison to theory. > > You are invited to come and have a drink with us at tea time (today > Tuesday 15h00) > in the Nikhef hall. > > The b-physics group. > > > > > > _______________________________________________ > Nikhef-wide mailing list > Nikhef-wide(a)nikhef.nl > https://mailman.nikhef.nl/mailman/listinfo/nikhef-wide -- ======================================================================== Patrick Koppenburg Nikhef, Amsterdam http://www.koppenburg.org/address.html

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Re: [Bfys-physics] [Nikhef-wide] Celebrating the evidence for the Bs->mumu decay in LHCb
by Patrick Koppenburg 13 Nov '12

13 Nov '12

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[Bfys-physics] LHCb evidence for Bs->mumu
by Marcel Merk 12 Nov '12

12 Nov '12

Dear friends, This morning a preprint was submitted to the arXiv with first (3.5 sigma) evidence of the decay Bs->mumu as well as a first determination of the branching ratio. I am particularly proud of this result since our Nikhef group has made central contributions to: * Theory: together with our Nikhef theory friends we addressed the time integrated vs "t=0" BR. * fs/fd fragmentation: a leading systematic input for the Bs->mumu BR extraction * the selection and background study for Bs->mumu. Congratulations to all people involved! Cheers, - Marcel

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[Bfys-physics] Bfys Meeting Friday 9 November at 9:30 h in N328
by Tjeerd Ketel 09 Nov '12

09 Nov '12

Bfys Meeting Friday 9 November at 9:30 h in N328 Discussions on 9:30 fs/fd 10:00 Bs -> mu mu 10:30 AOB Best regards, Tjeerd =================================================================== http://agenda.nikhef.nl/conferenceDisplay.py?confId=2182 =================================================================== Title: Nikhef Description: Bfys Meeting 9:30 - 10:45 Community: LHCb Password: n328 Meeting Access Information: - Meeting URL SeeVogh R.N. http://research.seevogh.com/join?meeting=M9MIMi2M2BDlDt9I9lDD99 EVO International http://evo.caltech.edu/evoNext/koala.jnlp?meeting=M9MIMi2M2BDlDt9I9lDD99 - Password: n328 - Phone Bridge ID: 605 2633 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 ===================================================================

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[Bfys-physics] Another Bfys meeting for next week
by Tjeerd Ketel 06 Nov '12

06 Nov '12

Bfys Meeting Friday 16 November at 10h in N328 Discussion on 10:00 LHCB-PAPER-2012-044 "Exclusive J/psi and psi(2S) Production at sqrt(s) = 7 TeV" Best regards, Tjeerd ---------- Forwarded message ---------- Date: Mon, 5 Nov 2012 13:25:49 +0000 From: Raluca Muresan <raluca.muresan(a)cern.ch> To: "lhcb-general (LHCb General mailing list)" <lhcb-general(a)cern.ch> Subject: First circulation of publication draft for PAPER-2012-044 Exclusive J/ψ and ψ(2S) Production at s√=7 TeV Dear Colleagues, A paper is available for your comments: Title: Exclusive J/$\psi$ and $\psi$(2S) Production at $\sqrt{s} = 7$ TeV Journal: Journal of Physics G Contact authors: Dermot Moran, Ronan McNulty Referees: Monica Pepe-Altarelli (chair), Andrei Nomerotski, Paula Collins, Leandro de Paula (EB) Analysis note: ANA-2012-059 Deadline: 19-Nov-2012 e-group: lhcb-paper-2012-044-reviewers Link: https://cdsweb.cern.ch/record/1491625 Twiki: https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/ExclusiveDimuon Institutes requested to make institutional comments: Moscow State University, Russia. LPNHE, Paris, France Warwick, United Kingdom. Dortmund, Germany EPFL, Lausanne, Switzerland. NIKHEF, Netherlands Please send any comments via the CDS system. It is the responsibility of the contact authors to provide replies on all comments made. Subsequent modification to the publication are made in consultation with the referees and during the EB reading. Following this, there will be a final meeting of the editorial board with contact authors and reviewers present where final decisions are made. As the last step a short presentation is given to the collaboration and the paper is sent for publication. 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/edboard/EditorialBoard.html all the best, Raluca (for Ulrik)

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[Bfys-physics] Fwd: First circulation of publication draft for PAPER-2012-044 Exclusive J/ψ and ψ(2S) Production at s√=7 TeV
by Patrick Koppenburg 06 Nov '12

06 Nov '12

Hi all, There's a new paper for us about pp -> pp psi (I'm very glad to see some physics coming out of the very special trigger lines that were added 2 years ago!) Cheers, Patrick -------- Original Message -------- Subject: First circulation of publication draft for PAPER-2012-044 Exclusive J/ψ and ψ(2S) Production at s√=7 TeV Date: Mon, 5 Nov 2012 14:25:49 +0100 From: Raluca Muresan <raluca.muresan(a)cern.ch> To: lhcb-general (LHCb General mailing list) <lhcb-general(a)cern.ch> Dear Colleagues, A paper is available for your comments: Title: Exclusive J/$\psi$ and $\psi$(2S) Production at $\sqrt{s} = 7$ TeV Journal: Journal of Physics G Contact authors: Dermot Moran, Ronan McNulty Referees: Monica Pepe-Altarelli (chair), Andrei Nomerotski, Paula Collins, Leandro de Paula (EB) Analysis note: ANA-2012-059 Deadline: 19-Nov-2012 e-group: lhcb-paper-2012-044-reviewers Link: https://cdsweb.cern.ch/record/1491625 Twiki: https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/ExclusiveDimuon Institutes requested to make institutional comments: Moscow State University, Russia. LPNHE, Paris, France Warwick, United Kingdom. Dortmund, Germany EPFL, Lausanne, Switzerland. NIKHEF, Netherlands Please send any comments via the CDS system. It is the responsibility of the contact authors to provide replies on all comments made. Subsequent modification to the publication are made in consultation with the referees and during the EB reading. Following this, there will be a final meeting of the editorial board with contact authors and reviewers present where final decisions are made. As the last step a short presentation is given to the collaboration and the paper is sent for publication. 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/edboard/EditorialBoard.html all the best, Raluca (for Ulrik)

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