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Introduction - Hideki Okawa
MDC1 plan:
Sebastian: do plan to produce an AuAu background with HIJING simulation?
Jin: Background is the most challenging part. Concern AuAu simulation too slow to match background stat. So suggest follow the sPH-HF-2017-02 note and use fast simulation to update the AuAu background with the updated tracking. There was a validation plot in sPH-HF-2017-02 to check fast simulation against full simulation
Hideki: how ATLAS handle the background study?
Sebastian: ATLAS simulated PYTHIA and PYTHIA embedding to real data
HF tools - Cameron Dean
Hideki: When MB simulation would be submitted?
Cameron: expect a fix into the production build (acts was not handling low multiplicity events), they should be ready to go
D0 update - Hansheng Li
Jin: it is interesting to notice the asymmetric tail on slide 3
Cameron/Wei/Jin: suggest check 2D plots:
- D0 Mass vs D0 pT
- p_reco/p_truth vs p_truth for the pion and kaon tracks.
Slide 5: b->D0 has a significant DCA peak at zero
Cameron: Charm is produced while a b production?
Jin: This may be possible as MPI is on, but the cross-section at RHIC should be small
Cameron: ACTS vertex to false in this analysis, and the code could have grabbed secondary vertex in the truth container and used as primary vertex
Jin: there is a deterministic way to extract the primary vertex via HepMC::FourVector& PHHepMCGenEvent::get_collision_vertex()
Wei: It will be very useful to have an ancestry trace to quarks to validate the quark origin of the b->D0?
Cameron: latest version should have that.
Slide 6:
Cameron : TrackIP Chi2>1 FD X2 >80 push the resonance to be displaced
Xin: what is the decay vol. setting in Pythia?
Jin: currently not set [ https://github.com/sPHENIX-Collaboration/MDC1/blob/main/submit/HF_pp200_signal/rundir/phpythia8_HF_MDC1.cfg ]
Xin: suggest to hand long-lived particles to G4 propagation and it is great Fun4All has the built-in Pythia6 decayer
Hideki: How STAR handled it?
Xin: Via embedding.
TODO by Jin and Cameron: work with ACTS developer on the vertex finding algorithm for HF MDC1.
D_s update - Zhaozhong Shi
Jin: what was the difference between slides 3 and 4 in cuts?
Zhaozhong: matching truth PID, vertex matching cuts.
Jin: is there a way to apply a cut on the KFParticle output nutple that requires a parent to exclusively decay to a final state?
Cameron: Currently no direct trick.
Jin: for Zhaozhong, a quick fix is to follow hansheng's example to cut on inv. mass of the truth momentum matching PDG mass.
Jin: decay finder is a cleaner solution. And it would be great if the decay finder could output a DST object, so a user analysis module could match the finder result to the events.
Xin: what is the low pT reach for the Ds reco?
Zhaozhong: CMS D_s reached down to 3GeV/c, B_s can reach zero. Not yet looked carefully at sPHENIX.
Jin: might need dedicated D_s signal filtered simulation to build sufficient statistics on the pT acceptance scan
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