PV reconstruction : Homogenizing Allen and Moore PV finders. Change of rho cut and Kalman Filter covariance matrix initialisation
- Rho cut (
Maximum distance squared of vertex to beam line) is changed from 0.3f to 0.09f. The distribution on 2024 MC sample is attached - Kalman Filter covariance matrix initialization is changed. Here are two motivations for that:
- To match the initialisation in REC : Rec!3464 (merged)
- New initialisation shows slightly better performance in PV efficiencies than the current default based on 2024 MC sample :
| Default covariance matrix initialisation Velo::Tracking::param_w_inverted , 0.f, 0.01f Velo::Tracking::param_w_inverted, 0.f, 0.01f | Initialize the covariance matrix with 100.0f, 0.f, 0.01f, 100.0f, 0.f, 0.01f | |||
|---|---|---|---|---|
| Efficiencies, % | False PVs, % | Efficiencies, % | False PVs, % | |
| all | 93.91 +- 0.03 | 1.94 +- 0.02 | 94.06 +- 0.03 | 1.68 +- 0.02 |
| isolated | 97.48 +- 0.05 | 1.06 +- 0.04 | 97.63 +- 0.05 | 0.95 +- 0.04 |
| close | 89.92 +- 0.05 | 2.99 +- 0.04 | 90.08 +- 0.05 | 2.56 +- 0.04 |
| ntracks<10 | 67.98 +- 0.23 | 21.35 +- 0.22 | 68.74 +- 0.23 | 18.89 +- 0.23 |
| ntracks>=10 | 96.82 +- 0.03 | 0.00 +- 0.02 | 96.90 +- 0.03 | 0.00 +- 0.02 |
| z<=-50.0 | 95.02 +- 0.13 | 1.72 +- 0.10 | 95.20 +- 0.13 | 1.34 +- 0.10 |
| z in (-50.0,50.0) | 92.76 +- 0.04 | 2.02 +- 0.03 | 92.92 +- 0.04 | 1.88 +- 0.03 |
| z>=-50.0 | 96.08 +- 0.13 | 1.96 +- 0.09 | 96.17 +- 0.13 | 1.50 +- 0.09 |
| decayBeauty | 98.51 +- 2.10 | 1.83 +- 0.61 | 98.51 +- 2.10 | 2.65 +- 0.66 |
| decayCharm | 98.22 +- 0.19 | 1.47 +- 0.12 | 98.36 +- 0.19 | 1.12 +- 0.12 |
| decayStrange | 94.10 +- 0.03 | 1.65 +- 0.02 | 94.25 +- 0.03 | 1.47 +- 0.02 |
| other | 52.17 +- 4.90 | 13.64 +- 0.92 | 52.17 +- 4.90 | 11.34 +- 1.04 |
| 1MCPV | 99.70 +- 0.14 | 1.39 +- 0.10 | 99.80 +- 0.14 | 1.09 +- 0.10 |
| 2MCPV | 98.16 +- 0.14 | 1.24 +- 0.10 | 98.16 +- 0.14 | 1.03 +- 0.10 |
| 3MCPV | 95.74 +- 0.15 | 2.12 +- 0.11 | 95.74 +- 0.15 | 1.57 +- 0.11 |
| 4MCPV | 93.63 +- 0.17 | 1.47 +- 0.13 | 93.89 +- 0.17 | 1.73 +- 0.13 |
| 5MCPV | 92.62 +- 0.22 | 2.08 +- 0.17 | 92.79 +- 0.22 | 1.74 +- 0.17 |