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28496040 X3876_DDstar=TightCut

Vanya Belyaev requested to merge ibelyaev/my-changes into master

Decay of new narrow charged X+ state into DD* just at the threshold

  • D_s1(2536)+ is used as proxy for X+
  • mass of D_s1 is set to be 3.876 (just above D0D*+ threshold) and width of 2 MeV
  • to get "charmonium-like" spectrum for charged X, a trick is used :
  • X+ is generated in the decay of chi_c1(1P) -> X+ e-
  • the mass of chi_c1 is set to be 3.890 GeV with a width of 2 MeV
  • X+ decays into D0D+ and D+D0 pairs
  • D* decays according to PDG into Dpi and Dgamma
  • D0 decays into K- pi+
  • D+ decays into K- pi+ pi+ usinng Dalitz decay model
  • tight cuts for the D0/D+ mesons and all final state stable particles are applied
  • two very nice tricks by Michael Wilkinson are used:
    • only charmonium production is activated for Pythia8
    • D+ lifetime cut for D0/D+ is applied via EvtGenDecayWithCutTool
  • CPU performance is ~1.6seconds/event (655 seconds/400 events)
  • integrated efficiency for generator-level cuts is (5.05+-0.36)% as reported in GeneratorLog.xml
  • efficiency for D+ lifetime cuts is (38.48+-0.48)% (must be between 63 and 13%)
  • efficiency for generator-level cuts is (10.66+-0.50)%

@ipolyako

Edited by Vanya Belyaev

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