[Hybrid baryons] Fwd: Re: HSWG: PAC44 Hybrid meson photoproduction (A.D'Angelo et al.) review committee

Sat May 7 21:29:31 EDT 2016

   Dear Coolleagues,

 Please find in the p.224 of the attached paper the old Bag Model evaluation for the baryon hybrid decay widths. These evaluations predict the width of hybrid baryon in the range from 110 MeV to 250 MeV.

 Our evaluation for the hybrid in  KY channels done with its width of 250 MeV, while observation of hybrid in pi^pi^-p channel (very important according to the attached paper) was etimated for the hybrid width of 200 MeV. Considering that in the attached paper they expect for hybrid masses 1.44 GeV and 1.7 GeV, the width values used in our evaluations look reasonable since the phase space available for our hybrid decays increases.

   Best Regards,
                         Victor 

----- Original Message -----
From: "annalisa dangelo" <annalisa.dangelo at roma2.infn.it>
To: "hybrid baryons" <hybrid_baryons at jlab.org>
Sent: Saturday, May 7, 2016 5:42:17 AM
Subject: [Hybrid baryons] Fwd: Re: HSWG: PAC44 Hybrid meson photoproduction (A.D'Angelo et al.) review committee

Dear Hybrid Baryons Collaborators, 
please find in the following the first response from the Review Committee. 
They say they are impressed with the proposal and mainly suggest some clarification in the text, 
which I don't expect requiring too much work. 
They also propose to define a short "executive summary, which may require some specific thinking and 
common agreement. 
I propose we send Dan the required integrations on the parts he/she has written and Dan may implements them (after checking the English wording!) generating a first revised draft, which we may discuss at the next meeting. 
All the best 
Annalisa 

-------- Messaggio Inoltrato -------- 
Oggetto: 	Re: HSWG: PAC44 Hybrid meson photoproduction (A.D'Angelo et al.) review committee 
Data: 	Fri, 6 May 2016 16:43:29 +0100 
Mittente: 	Dan Watts <dwatts1 at ph.ed.ac.uk> 
A: 	Daniel Watts <daniel.watts at ph.ed.ac.uk> , Carlos Salgado <salgado at jlab.org> , nick markov <markov at jlab.org> , annalisa.dangelo at roma2.infn.it , Marco Battaglieri <battagli at jlab.org> , markov at jlab.org , Carlos Salgado <salgado at jlab.org> 

Dear Annalisa,

All the reviewers were impressed with the proposal and agreed that a 
very thorough job has been made in simulating the analysis and that the 
physics case is well made. The comments and suggestions from the 
reviewers are collated below

Best regards,
Dan

p7:  Are there any (even simple minded) theoretical studies that 
indicate that the hybrid baryons should have a comparable width to the 
standard N*? Or that the photocoupling is of similar magnitude?

Also could the (disputed) sightings of hybrid states in the meson sector 
with widths of similar magnitude to standard mesons be mentioned as a 
possible indication that hybrids are not expected to have large 
unobservable widths?

P7 Fig. 2: Should probably mention what the other curves are (maybe in 
the caption) so readers dont have to look up the paper.

P9. 3rd para: A result similar -> A theoretical result similar

p13: Is there an estaimated timescale for calculations at the physical 
pion mass to become available?

p22 1st para: providing a nicely complementary range of measurable 
photon virtualities -> providing a complementary range of measurable 
photon virtualities, including the gap region for the lower beam energy 
setting.

p24 called FASTMC -> (FASTMC)            this had already been defined

p27 1st para: with a detection efficiency lower than in the inclusive 
case where the value of W_rec is determined-> with a correspondingly lower

p32 1st para: since kinematic region -> since the kinematic region

p38 1st para: completely dominates  ( this assumes the forward tagger is 
triggered on charged particles i.e. ignoring the photon flux  - text is 
probably OK as is though)

p38 3rd para: the farm -> a CPU farm

p43: These ratio -> These ratios

-------------

FASTMC is an important part of you studies. Could you provide some more 
details on it?

Figs 6: what are the solid lines?

P.21, Fig 12. In the text it says that positive torus current causes 
increase in minimum detectable $Q^{2}$, while negative current lowers 
the minimum values. Fig. 12 shows that in both cases minimal $Q^{2}$ is 
about $0.2 GeV^{2}$. Could you clarify?

 P. 48, Eq 8, last line: $105 cos\theta \to 105 cos^{2}\theta$

Fig 15, right. What are the dots?

Fig 20. How do you select exclusivity cuts?

Fig. 25, 26: The depletion at 35 degrees is much more  prominent for p 
and $K^{+}$ than for $\pi^{-}$. Could you clarify why?

-------------

Since the full proposal is presenting such detailed studies of proposed 
analysis and running conditions, it will be nice to see somewhere a 
short  "executive summary"
where with tables or simple statements there will be details of the 
overall proposal : i.e.  most important expected physics outputs and 
effects in hadron structure models,  specific running conditions (i.e a 
table including triggers and effects on other parallel programs in 
CLAS12), expected more difficult points on the analysis -model 
dependences, backgrounds, ambiguities, acceptances ...... and so on.

Best,
Dan

On 05/05/2016 11:32, Dan Watts wrote:
> Hi
>
> I hope to have finished reviewing the proposal later today/early
> tomorrow. The deadline is quite tight.
> How is everyone else doing?
>
> Best,
> Dan
>
> On 19/04/2016 07:54, Marco Battaglieri wrote:
>> Dear Dan (chair), Nick and Carlos,
>> I'd like to thank you for agreeing to be part of the Hybrid meson
>> photoproduction (A.D'Angelo et al.) review committee.
>> In attachment you will find the charge with deadlines and duty.
>> Annalisa D'Angelo is acting as contact person. I'm expecting he will
>> provide all necessary support (supporting material, missing info,
>> answers, ...) in a timely manner in order to respect the deadline.
>> Thanks again for your contribution.
>> Marco
>>
>>
>>
>>
>
>

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