# Track momentum resolution dpt/pt 
#  based on parametrisation of ILD IDR results (Figure 8.1a)
#  A.F.Zarnecki, June 12, 2020


set ResolutionFormula {
  (abs(eta) <= 2.0) *
    exp( -6.82012  - 0.284133*abs(eta) + 0.64585*eta*eta
     + (0.829675 -0.188197*abs(eta) +  0.106226 * eta*eta  - 1.0) * log(pt)
     + (0.0766417-0.00435667*abs(eta) + 0.00174804*eta*eta) * log(pt)*log(pt))
  +
  (abs(eta) > 2.0 && abs(eta) <= 3.0) *
    exp(  -4.54609
     + ( 0.87526 - 1.0) * log(pt)
     + (-0.0800672 + 0.0891669 * abs(eta)) * log(pt)*log(pt))
  }