OPT-IN:Target and Beam-Target Spin Asymmetries in exclusive Ï+ and Ïâ electroproduction with 1.6 to 5.7 GeV electrons

[Igor Strakovsky]

Dear Peter,

That is really impressive work.  I have several comments and suggestions for your
consideration...

1) Abstract: You do not have en-->epi-p data.  You did not collect data on free but 
bound neutron.  One cannot possible to measure pionEPR on the "neutron" target you 
have to take into account FSI corrections to convert ed-->epi-pp into en-->epi-p.  
There are no FSI calculations for pionEPR. FSI for asymmetries could be small but 
still unknown.

2) Abstract: Most of "previous world data" are CLAS measurements (according to the
SAID database - CLAS collected about 85% of the world database) and I would  punch 
this fact.

3) Abstract: I do not think that last phrase is necessary here.  No resonance 
couplings are presenting in the manuscript. 

4) line 16: your list of pi- measurements is uncompleted, check the SAID database
which has all available data.

5) line 45: I am not sure that one can possible to prove that your treatment for
en-->epi-p is good enough.  We published several PRC papers for pionPR analyses 
which allows to get gn-->pi-p from CLAS (g10) and MAMI-B gd-->pi-pp measurements.  
inSpire can give you appropriate refs.

6) line 143: How is about a neutron-detection efficiency?  How your took it into 
account?

Let me suggest to add more curves to your data-plots using EBAC and SAID predictions which will obviously benefit this manuscript. 

BTW I am not sure if I am familiar with JANR treatment but MAID07 does not fit 
available g*n-->pi-p data (they used some relationships between p and n targets)

Cheers, Igor