User name J. Volmer
Log entry time 15:09:42 on September 18,1998
Entry number 207
Followups:
keyword=epsilon dependence of unseparated D-D+ ratiosShown below are the ratios (sigT- + eps*sigL-)/(sigT+ + eps*sigL+) as a function of the virtual photon polarization epsilon, for all four of our Q^2's and -t as a parameter. It illustrates the fact that taking the unseparated ratio at -t=0.3 and 0.6 and linearly extrapolating to epsilon=0 will overestimate R_T in any case, and worse so in our case, with small -t and high Q^2.
The actual values for sigT and sigL come from Michel Guidal and Marc Vanderhaeghen's Regge theory calculations. Taking our 'toy model' (Henk's parametrization of the Brauel data), the -t-dependence would probably differ, but the epsilon dependence would of course show the same behaviour.
FIGURE 1
