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[PWGCF,PWGHF] Split kaon DCA secondary templates into HF and LF - #18481

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Nov 2, 2026
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[PWGCF,PWGHF] Split kaon DCA secondary templates into HF and LF#18481
fgrosa merged 4 commits into
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@FDUEnrich FDUEnrich commented Oct 27, 2026 •
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Separate kaon MC DCAxy templates into HF and LF using RecoDecay::getParticleOrigin. Include Omega contributions in LF; leave other particle classifications unchanged.

FDUEnrich and others added 2 commits October 27, 2026 16:26
@FDUEnrich
[PWGHF] Split kaon DCA secondary origins into HF and LF
a8c9038
@FDUEnrich @fgrosa
[PWGHF] Use RecoDecay for kaon origin classification
240d1d3 
Follow RecoDecay::getParticleOrigin with its default arguments and classify nonzero origins as HF, as suggested by Fabrizio. Remove the custom PDG and ancestry helpers without changing the remaining origin routing.

Co-authored-by: Fabrizio Grosa <fabrizio.grosa@cern.ch>
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@FDUEnrich
FDUEnrich requested a review from jaelpark as a code owner October 27, 2026 18:23
xinyepeng
xinyepeng previously approved these changes Oct 28, 2026
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xinyepeng enabled auto-merge (squash) October 28, 2026 00:46
lauraser
lauraser reviewed Oct 30, 2026
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Comment thread PWGCF/FemtoDream/Core/femtoDreamUtils.h Outdated

/// Classify true kaons from the correct collision for the DCA templates.
template <typename T>
inline int getKaonOrigin(T const& particles, typename T::iterator const& particle)

@lauraser lauraser Oct 30, 2026

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This function is used only y HF. Would it be possible to move this template to the HF charm producer instead of implementing it here?

@fgrosa fgrosa Nov 2, 2026

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Hi @lauraser it is fine to move it to the HF producer, but you should consider to use it also for other analyses, as the fraction of kaons from HF decays is about 5% so not totally negligible, and in other femto analyses they were always considered primaries, but they are not (as they are produced micrometers away from the interaction point)

@FDUEnrich FDUEnrich Nov 2, 2026

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Hi, Laura. I've modified according to your request. Could you please have a look?

@lauraser lauraser Nov 2, 2026

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Hi, thanks a lot for the explanation @fgrosa ! I would like to ask @FDUEnrich to present this in more detail in femto PAG when possible, and then we could discuss the implications for other analyses as well. Thanks a lot!

auto-merge was automatically disabled November 2, 2026 10:57

Head branch was pushed to by a user without write access

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lauraser enabled auto-merge (squash) November 2, 2026 12:53
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fgrosa disabled auto-merge November 2, 2026 15:04
@fgrosa
fgrosa merged commit 452c61a into AliceO2Group:master Nov 2, 2026
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@fgrosa fgrosa mentioned this pull request Nov 2, 2026
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Alascraker pushed a commit to Alascraker/O2Physics that referenced this pull request Nov 2, 2026
Zhihe Han
[PWGHF] Fill the V0 MC origin with HF and LF secondary classes
b3bb84a 
- reuse RecoDecay::getParticleOrigin (as done in AliceO2Group#18481) instead of an ad-hoc
  first-digit PDG scan, so the V0 origin is filled with kPrimary, kMaterial,
  kSecondaryFromHF and kSecondaryFromLF
- the phi chain (phi -> K0/K0bar -> K0s) is light-flavour feed-down and is filled
  as kSecondaryFromLF
- add RecoDecay::isDiquark and skip diquark states in RecoDecay::getParticleOrigin:
  their PDG codes (4101, 4201, 5101, ...) satisfy pdg / 1000 == 4 or 5 and would
  otherwise be taken as charm/beauty baryons
- use o2::constants::physics::Pdg::kPhi and kK0 instead of literal PDG codes
Alascraker pushed a commit to Alascraker/O2Physics that referenced this pull request Nov 2, 2026
Zhihe Han
[PWGHF] Fill the V0 MC origin with HF, LF and phi secondary classes
6e4c8a6 
- reuse RecoDecay::getParticleOrigin (as done in AliceO2Group#18481) instead of an ad-hoc
  first-digit PDG scan, so the V0 origin is filled with kPrimary, kMaterial,
  kSecondaryFromHF and kSecondaryFromLF
- add kSecondaryFromPhi: the phi chain (phi -> K0/K0bar -> K0s) is light-flavour
  feed-down, but it is kept as a separate class because the relatively long phi
  lifetime makes it a distinct source that should not be mixed with other
  light-flavour feed-down
- add RecoDecay::isDiquark and skip diquark states in RecoDecay::getParticleOrigin:
  their PDG codes (4101, 4201, 5101, ...) satisfy pdg / 1000 == 4 or 5 and would
  otherwise be taken as charm/beauty baryons
- use o2::constants::physics::Pdg::kPhi and kK0 instead of literal PDG codes
Alascraker pushed a commit to Alascraker/O2Physics that referenced this pull request Nov 2, 2026
Zhihe Han
[PWGHF] Fill the V0 MC origin with HF, LF and phi secondary classes
680cb11 
- reuse RecoDecay::getParticleOrigin (as done in AliceO2Group#18481) instead of an ad-hoc
  first-digit PDG scan, so the V0 origin is filled with kPrimary, kMaterial,
  kSecondaryFromHF and kSecondaryFromLF
- add kSecondaryFromPhi: the phi chain (phi -> K0/K0bar -> K0s) is light-flavour
  feed-down, but it is kept as a separate class because the relatively long phi
  lifetime makes it a distinct source that should not be mixed with other
  light-flavour feed-down
- add RecoDecay::isDiquark and skip diquark states in RecoDecay::getParticleOrigin:
  their PDG codes (4101, 4201, 5101, ...) satisfy pdg / 1000 == 4 or 5 and would
  otherwise be taken as charm/beauty baryons
- use o2::constants::physics::Pdg::kPhi and kK0 instead of literal PDG codes
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