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WIP: Modifying BcVegPy and GenCuts to add production of excited Bc states (LHCBGAUSS-1566)

Liupan An requested to merge LHCBGAUSS-1566.bc2s into Sim09
  1. The BcVegPy generator is modified to add the generation of excited Bc states;
  2. BcDaughtersInLHCb is modified so that particles heavier than Bc are decayed first. For the excited Bc states, BcstDaughtersInLHCb is defined for all of them. To put them in one script, we need to first know which particle we are targeting on, then set m_sigBcPID accordingly. The only way I can think of is to add a loop in applyCut to check the ID of the first Bc state found, and set m_sigBcPID to the ID of it. It will make the process a bit less efficient, and this can't be applied to the ground Bc state since it contained contribution from all excited states.
  3. If the solution in step 2 is fine, I will modify BcNoCut, BcChargedNumInLHCb and BcDaughtersInLHCbAndMassCut in the same way.
Edited by Gloria Corti

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