EPA dependence on epa_mass
I am trying to use the equivalent photon calculation for a cross-section photon photon > b bbar
What is the minimal sindarin to compute the total cross-section of this process?
process proc = "A", "A" => "b","bbar"
beams = "e-", "e+" => epa, epa
epa_x_min = 1e-10 !mandatory
epa_mass = 0.105 GeV ! 511 keV !mandatory
!epa_q_min = 0.105 GeV ! suggested in "minimal viable scenario" of the Manual
Changing epa_mass in this setting gives very little variation compared to the expectation. e.g. at 3 TeV e+e- I get 9 pb for epa_mass 511 keV and 3 pb for epa_mass 0.105 GeV. As ln(200)~5 the two cross-section cannot be just a factor 3 different, unless I am badly misunderstanding the dependence of this cross-section on the emitter mass.
Thanks for the clarification.
Roberto
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- Wolfgang Kilian Edit question
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