Bfys Meeting at Friday 29 June at 9:30 h in H331
9:30 News by Marcel Merk 9:45 Discussion of LHCb-PAPER-2012-019 10:45 End of the meeting
As there were no volonteers for the introduction, I propose we just go through the paper. You can send your comments by email as well.
Title : Measurement of the ratio of branching fractions $B(B^0 \to K^{\ast 0} \gamma) / B(B^0_s \to \phi \gamma)$ and direct $C!P$ asymmetry in $B^0 \to K^{\ast 0} \gamma$ Journal : Nucl. Phys. B Contact authors: Olivier Deschamps, Ricardo Vazquez Gomez Referees : Jean Wicht (chair), Andreas Schopper, Pierluigi Campana (EB) Institutes : Cambridge, United Kingdom. CBPF, Rio de Janeiro, Brazil Moscow State University, Russia. LPNHE, Paris, France EPFL, Lausanne, Switzerland. NIKHEF, Netherlands Analysis note : ANA-2012-014 Deadline : 03-Jul-2012 e-group : lhcb-paper-2012-019-reviewers Link : http://cdsweb.cern.ch/record/1456464 Twiki : https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/RadiativeRatio2011
Best regards, Tjeerd =================================================================== EVO: Title: Nikhef Description: Bfys Meeting 9:30-10:45 h Community: LHCb Password: n328
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Hi Tjeerd,
Attached my comments, changed with input we had during the meeting. I have included something about the discussion we had concerning the background asymmetry, but not any other things that were not already in my list.
Cheers, Wouter
On 06/28/2012 04:18 PM, Tjeerd Ketel wrote:
Bfys Meeting at Friday 29 June at 9:30 h in H331
9:30 News by Marcel Merk 9:45 Discussion of LHCb-PAPER-2012-019 10:45 End of the meeting
As there were no volonteers for the introduction, I propose we just go through the paper. You can send your comments by email as well.
Title : Measurement of the ratio of branching fractions $B(B^0 \to K^{\ast 0} \gamma) / B(B^0_s \to \phi \gamma)$ and direct $C!P$ asymmetry in $B^0 \to K^{\ast 0} \gamma$ Journal : Nucl. Phys. B Contact authors: Olivier Deschamps, Ricardo Vazquez Gomez Referees : Jean Wicht (chair), Andreas Schopper, Pierluigi Campana (EB) Institutes : Cambridge, United Kingdom. CBPF, Rio de Janeiro, Brazil Moscow State University, Russia. LPNHE, Paris, France EPFL, Lausanne, Switzerland. NIKHEF, Netherlands Analysis note : ANA-2012-014 Deadline : 03-Jul-2012 e-group : lhcb-paper-2012-019-reviewers Link : http://cdsweb.cern.ch/record/1456464 Twiki : https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/RadiativeRatio2011
Best regards, Tjeerd =================================================================== EVO: Title: Nikhef Description: Bfys Meeting 9:30-10:45 h Community: LHCb Password: n328
Meeting Access Information:
Meeting URL http://evo.caltech.edu/evoNext/koala.jnlp?meeting=M2MvMB222lD9DB9D98DM92
Password: n328
Phone Bridge ID: 551 4250 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 mailing list Bfys-physics@nikhef.nl https://mailman.nikhef.nl/mailman/listinfo/bfys-physics
Hi Tjeerd,
Two main issues from my side:
1) The comparison between experiment and theory needs to be done with care, since the experimental branching ratio is time-integrated, while the theoretical branching ratio is defined from the amplitude level at t=0. The translation between the two values is given in Eq.(12) in [arXiv:1204.1735].
We suggest to add this sentence after L.17: "When comparing the experimental and theoretical branching ratios, special care has to be taken due to the lifetime difference of the $B_s^0$ system. The correction can be as large as 9%, depending on the polarization state and the value of $A_{\Delta\Gamma}$ as described in Ref.[arXiv:1204.1735]."
2) Fig.2: The amount of partially reconstructed B+0->hhgamma is very different between the two final states. Do you understand that? This directly affects the combinatorial background, which in turn affects the signal yield and thus the measured ACP.
Cheers, Niels
PS. Minor textual stuff in the attachemnt.
On Fri, 29 Jun 2012, Wouter Hulsbergen wrote:
Hi Tjeerd,
Attached my comments, changed with input we had during the meeting. I have included something about the discussion we had concerning the background asymmetry, but not any other things that were not already in my list.
Cheers, Wouter
On 06/28/2012 04:18 PM, Tjeerd Ketel wrote:
Bfys Meeting at Friday 29 June at 9:30 h in H331
9:30 News by Marcel Merk 9:45 Discussion of LHCb-PAPER-2012-01910:45 End of the meeting
As there were no volonteers for the introduction, I propose we just go through the paper. You can send your comments by email as well.
Title : Measurement of the ratio of branching fractions $B(B^0 \to K^{\ast 0} \gamma) / B(B^0_s \to \phi \gamma)$ and direct $C!P$ asymmetry in $B^0 \to K^{\ast 0} \gamma$ Journal : Nucl. Phys. B Contact authors: Olivier Deschamps, Ricardo Vazquez Gomez Referees : Jean Wicht (chair), Andreas Schopper, Pierluigi Campana (EB) Institutes : Cambridge, United Kingdom. CBPF, Rio de Janeiro, Brazil Moscow State University, Russia. LPNHE, Paris, France EPFL, Lausanne, Switzerland. NIKHEF, Netherlands Analysis note : ANA-2012-014 Deadline : 03-Jul-2012 e-group : lhcb-paper-2012-019-reviewers Link : http://cdsweb.cern.ch/record/1456464 Twiki : https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/RadiativeRatio2011
Best regards, Tjeerd =================================================================== EVO: Title: Nikhef Description: Bfys Meeting 9:30-10:45 h Community: LHCb Password: n328
Meeting Access Information:
Meeting URL http://evo.caltech.edu/evoNext/koala.jnlp?meeting=M2MvMB222lD9DB9D98DM92
Password: n328
Phone Bridge ID: 551 4250 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
===================================================================
Bfys-physics mailing list Bfys-physics@nikhef.nl https://mailman.nikhef.nl/mailman/listinfo/bfys-physics
Dear all,
We collected quite some comments. Please, "add, remove or change" the comments before Tuesday afternoon 16:00, so that Wouter can upload them before the deadline tomorrow (Tuesday) evening. Especially some of the "spoken comments" may be missing. Check it.
Best regards, Tjeerd
-
Niels Tuning -
Tjeerd Ketel -
Wouter Hulsbergen