[Clascomment] OPT-IN: Measurement of the Helicity Difference E in omega -> pi+ pi- pi0 Photoproduction

Tue Jun 20 04:05:53 EDT 2017

Hello,

This is a particularly well written and clear paper. Congratulations. Just a couple remarks:

- Although the relation between E_gamma and W is trivial, it would add clarity if it were explicit in at least one instance. Either mention the value of E_gamma in paranthesis after W ~ 2 GeV (in the abstract or at the bottom of page 9), or add on top of Fig. 8 a graduation in W (while lowering slightly the inserts for the angular binning on the top 4 figures).

- Consider adding next to your Ref. [6]: J. M. Laget, Nucl. Phys. A 699 (2002) 184c, where these considerations are discussed as well. This work predates your Ref[6] and uses "saturated" Regge trajectories. There are other publications of Jean-Marc on photoproduction of vector mesons where the model is detailed, but they concentrate on rho and phi, or on large t.

Regards,
Michel GarÃ§on.