Changes

===Describing s and t dependence===

===Describing s and t dependence===

It is doubtful that this is needed, because the range in ''s'' covered by GlueX is very small, and one expects to carry out independent fits for different ranges in t.  However, it might be useful at some point to do a global fit to all s,t values.  In such a case, it is useful to recall the expected behavior in high-energy peripheral production given by Regge theory.

It might be useful at some point to do a global fit to the data from all s,t bins.  In such a case, it is useful to recall the expected behavior in high-energy peripheral production given by Regge theory.

:<math>

:<math>

\sigma \sim s^{\alpha_R-1} e^{bt}

\sigma \sim s^{\alpha_R-1} e^{bt}