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# System prepended metadata

title: Physics Performance Meeting

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# Physics Performance Meeting

Slides: https://indico.belle2.org/event/4415/

## Hadron ID MC14 and bucket 16 (Vismaya Vs)
 * Using default hadron ID selection (incl. >=20 CDC hits)
 * bucket 16 (20fv) vs MC14ri_a (100fb-1)
 * signal/background in M(D0) slightly improved for MC14ri_a and bucket16
 * K-efficiency decreased for MC14ri_a and bucket16, both for CDC and TOP
 * ROC curves for positive and negative tracks are compared for MC13/proc11 and MC14ri_a/bucket16
     * a more quantitative study for the charge asymmetry will follow soon.


#### Questions

* Abtin: page 14, what is the main difference between MC13 and MC14?
  > Jake: Updated dE/dx calibration payloads, MC14ri_a are more realistic and are based on data.

* Abtin: Have you checked other subdetectors?
  > Vismaya: Not yet.
  > Angelo: Significant improvement for ARICH has been shown in hadron ID meetings.

* Torben/Angelo: Is the charge asymmetry mostly from the efficiency or mis-id?
  > page 22 (backup): The problem is in the efficiency. And yes, all tracks are in the TOP accepetance.

* Angelo: Please plot the asymmetry directly, not only overlayed ROC curves.

* Torben: Timeline for corrections?
  > Saurabh: Until end of next week, proc12 was only release yesterday.
  > Angelo: We will also release the systematics framework, so analysts can choose to use tables or the systematics framework.

* Frank: page 5, is the yield difference from changes to DECAY.DEC?
  > Saurabh: Since we see it in data as well, i suspects it is a changed tracking efficiency.

## Hadron ID (Angelo)
 * Received requests to provide HID corrections without >=20 CDC hits:
     * Angelo: the CDC hit requirement is motivated by dE/dx providing very poor separation below that threshold. I would expect that if a track reaches the TOP or the ARICH, it is likely to have >20 CDC hits, so by releasing the requirement the PID performance can only degrade. If you rely on good hadron ID, then it is not recommended to use tracks with <20 CDC hits. If you have a strong case for releasing this requirement, please report it to the Hadron ID meeting.

## Tracking (Petar)
 * studies for bucket16 and MC14ri_a in progress
 * dedicated meeting before the performance workshop to summarize the status [link]

## Neutrals (Savino)
 * instructions for energy bias correction available now: https://confluence.desy.de/display/BI/Neutrals+Performance#NeutralsPerformance-PhotonEnergyBiasCorrection
 * photon timing calibration reported in ECL meeting, will be available in next processing only
 * bucket16 and MC14ri_a for pi0 and gamma efficiencies to be checked