Hi all,

Here are my comments:

Dear Patrick and Matt,

Congratulations for that nice new result. It shows the potential of conversions for such studies.

Physics:
L.108: why S/sqrt(S+B) while you aim for a limit? Punzi or something similar would have been much more appropriate.
Eq.1: You don't say how you treat the factor 2 of B0/B0bar you have wrt to B+.
General: Its unclear where the uncertainty on the BF of the normalisation modes enters the computation of the limit. It's not mentioned. Generally, you could give fitted yields?

L.3: the computation (?) of many observables require ... (observables do not require anything)
L.22: Please put charges on DD
L.25: Is this a Letter?
L.31: Please explain better how the converted photons can broaden the mass (?) shape of background.
L.33: Say \B=\bd,\Bs here
L.34: "fall within the ... signal" sounds like jargon and is not very clear. Which are they?
L.39 and many more: CL should be in roman
L.61: did you really only use pythia 6?
L.78: I presume it's the tracks and not the vertex that is associated to a cluster. Maybe a comma will fix that.
L.89: why [] in [jpsigamma] while in L.75 you have (mu)?
L.97: You did not say if the largest value is a good or a bad value.
L.108: signal events -> signal decays
L.112: K*0->K+pi- and not K-pi+. You need to say cc is included.
L.120: sig and norm should be roman
L.132: which effect? These are statements. I don't see how you turn that into a systematic.
L.134: the B mass resolution
Fig.2: Bs->J/psigamma should be B->J/psigamma
L.146: B+ -> ...
L.172: space missing after \piz
L.163: kinematics is jargon. Please say what you exactly mean.
L.167: systematic uncertainty.
L.178: events -> candidates (that's a very nice example of why event should be avoided. All our events are downstream).
L.227: You should compare the Bd limit with Babar's here.
Fig.4: MC -> simulated. events -> decays
[1,6] fix the math to the actual paper title
[4] collaboration

Cheers,

Patrick

On 01/09/15 12:03, Tjeerd Ketel wrote:

-- ======================================================================== Patrick Koppenburg LHCb Physics Coordinator Nikhef, Amsterdam & CERN http://www.koppenburg.org/address.html