Discussion with Serguei Gevorkyan / Mon Apr 13

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Skype conference, attending: Elton, Rory, Serguei, Ilya

  1. Discussion regarding the t-dependence of sigma
    • Both the EM and strong t-dependence should be the same for pi0 and sigma production. They are both spin 0 mesons. The parity of the final state does not seem to matter.
    • The strong FF are similar to the EM FF, in that the main contribution is due to rho,omega exchange. In a VMD model, these vectors behave like photons, but different couplings.
    • The absorption of the pi0 or sigma is somewhat different in the nuclei. One may naively assume that the sigma cross section is twice the pi0 cross section (since it decays to two pi0's).
  2. Mass dependence
    • The 2pi0 production at low mass is dominated by the sigma, i.e. f0(500). At higher masses, the f0(980) and f2(1270) are important and tails may contribute down to lower masses.
  3. Estimates of the cross section
    • There is little data on sigma production at low energies and calculations should be more reliable than estimates from data.
    • Serguei will send formulas to Ilya, who can include them in a code to calculate the cross section.