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
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