Estimate the cross-section ratio R, defined by (7.18), at total centreof- mass energies E CM = 2.8,

Question:

Estimate the cross-section ratio R, defined by (7.18), at total centreof- mass energies E_CM= 2.8, 5 and 15 GeV, assuming that there are no resonance peaks at these energies and that (7.22) remains approximately valid even at energies as low as 2.8 GeV. How would you expect R to change when the energy becomes large enough to produce t tÌ… pairs, where t is the top quark?

Equation 7.18