HonexComb meeting #13

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Honexcomb #13

24 participants at peak

Georgios - light by light

Raph : How is the approval progressing in the collaboration ? No objection on the CMS side ; waiting for the ATLAS answer ; sharing intel…

Jacek : Could you elaborate on the 10% improvement in the combined measurement?

Sandor - Lambda c / D

Johanna : LHCb at 0.4, not consistent with slide 4… Peculiar rapidity dependence on slide 7… Jiayin : LHCb has new analysis going on, in pPb and PbPb, stay tuned…

Raph : Would it help to put the points at a more realistic pt when the bins are really large?

Jaebeom : comparison with models, slide 8, is color reconnection still in the game?

Jeremy : Lambda c in pp at 5 TeV from LHCb would really help, or even at 13 TeV. Slide 5 : the blue points are at the wrong energy.

Christian : Pythia, was discussed a bit in the open charm task force. Be careful about using color reconnection for cascades.

Florian - quarkonium feed-downs

Johanna and Cesar : have you tried to look at e+ e- ? Within a flavor, that could work…

Cesar : slide 4 from converted photons ? Yes.

Iwona : Plans for charmonia? Next report

Jaebeom : Consider the polarization ?
offline follow-up discussion: Jaebeom was mentioning the impact of polarization effects on cross-section model calculations. However, so far my derivation of feed-down fractions is completely based on experimental measurements which, hopefully, account for the uncertainty on an hypothetical polarized quarkonium production. I only refer to theory to support some assumptions when necessary.

Jeremy - Open charm

Johanna : Should provide d sigma / d y first, before to integrate

Slide 4 : How comes Alice and LHCb+Alice agree for the Lambda-c ? LHCb almost don’t contribute.

Cesar : Slide 4, which fragmentation functions ? In comes from the measurements here ; otherwise the ones from Pythia in the simulations.

Iwona : Timeline - after QM2022

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