Update PWGHF/Tasks/taskBs.cxx

Co-authored-by: fcolamar <fabio.colamaria@ba.infn.it>

Author: pchrista

PWGHF/Tasks/taskBs.cxx

@@ -189,7 +189,7 @@ struct HfTaskBsMc {
       auto candDs = candidate.index0_as<aod::HfCandProng3>();
       if (std::abs(candidate.flagMCMatchRec()) == 1 << hf_cand_bs::DecayType::BsToDsPi) {
 
-        auto indexMother = RecoDecay::getMother(particlesMC, candidate.index1_as<aod::BigTracksMC>().mcParticle_as<soa::Join<aod::McParticles, aod::HfCandBsMCGen>>(), pdg::Code::kLambdaB0, true);
+        auto indexMother = RecoDecay::getMother(particlesMC, candidate.index1_as<aod::BigTracksMC>().mcParticle_as<soa::Join<aod::McParticles, aod::HfCandBsMCGen>>(), pdg::Code::kBs, true);
         auto particleMother = particlesMC.iteratorAt(indexMother);
         registry.fill(HIST("hPtGenSig"), particleMother.pt());
         registry.fill(HIST("hPtRecSig"), candidate.pt());