[PWGHF,Trigger] Add Bc decay to D0K into the HF filter

[zhangbiao-phy]

Hi @fgrosa, Is it Ok? I only change the mass hypothesis from pion to kaon.

[fgrosa]

Hi @zhangbiao-phy, thanks!
I think that you need to adjust a bit the enum though; the code currently assumes that we have first "3-prong" beauty candidates (those with D0) and then "4-prong". In fact, you can see that for the 4-prong ones, we loop from B0 to Xib:

O2Physics/EventFiltering/PWGHF/HFFilter.cxx

Line 1264 in 7972d4b

for (int iHypo{0}; iHypo < kNBeautyParticles - 2 && !keepEvent[kBeauty4P]; ++iHypo) {

So you have to put the Bc after the B0toDstar and you have to pay very attention to the indices for the 4-progns (especially you have to replace kNBeautyParticles - 2 with kNBeautyParticles - 3), otherwise we screw up all the 4-prong channels.

[alibuild]

Auto-approving on behalf of @zhangbiao-phy.