[Clascomment] OPT-IN: Upper limits for the photoproduction cross section for the Phi--(1860) pentaquark state off the deuteron

[Luciano Pappalardo]

Thanks for this nice and well written paper. 
I have only minor comments:


************
INTRODUCTION
************
line 51:  "This experiment was mounted at Jefferson Lab to search"
          -> "This experiment, performed at Jefferson Lab, was aimed to search"

line 52: put "for the first time" within commas

lines 56-58: rephrase: "that photoproduction processes were a rich source
                        of pentaquarks. Furthermore, the production of the 
                        PHI^-- off the neutron was predicted to be an order
                        of magnitude..."

line 63: "for the neutron and proton"
         -> "for the neutrin and proton target, respectively."

line 70: "In addition, the bias is that the states" 
         -> "In addition, these states"


**********
EXPERIMENT
**********
line 4: "photoproduction experiment" -> "photoproduction reaction"
         ("experiment" already used in line 1)



*********
APPARATUS 
*********
lines 5-6: skip "the electromagnetic radiation of"

line 35: "allows us to reliably separate protons"
          -> "allows a reliable separation of protons"


********
ANALYSIS
********
***************
Event selection
***************
line 55-56: "We apply THE 1.3175... cut, illustrated by the shaded area, to select"

*******************
Detector simulation
*******************
line 3: "using the Monte-Carlo method" -> "using Monte-Carlo simulations"

line 16: "mumber of simulated events in each given kinematic bin"
         -> "number of events generated in each kinematic bin"

lines 18-19: "with an events configuration in the first row in Table III without"
             -> "with the events configuration given in the first row in Table III 
                AND without"

Caption of TABLE III: the second column is not described.

*****************
Model dependence
*****************
lines 1-2: rephrase: "do not know the kinematic dependence of the cross section
                      for the Phi^-- photoproduction, and since ..."

lines 26-27: "t" not defined and "parameter b" not explained

line 45: "pion combinatorics" -> "pion combinatorial background"

************************************
Trigger conditions and normalization
************************************
line 14: "signaling" -> "indicating" ("signal" already used in line 13)

line 22: "decaying INTO a proton and a pion"

line 50-51: "assigned A normalization uncertainty"

************************
Systematic uncertainties
************************
lines 3-4 "the qualitative change" -> "a significant change"

lines 18-22: skip the whole sentence "We assign ... previous section."
        


************
UPPER LIMITS
************
line 7: "detector simulation" -> "Monte-Carlo simulations"

lines 20-24: the whole sentence "This procedure ... sideband-subtracted method"
             is unclear. Try to explain better.


*******
SUMMARY
*******
lines 5-6: "near invariant mass M=1.862 GeV"
           -> "in the expected region (near invariant mass M=1.862 GeV)"