[RTA-WP4] updated selection for JPsi2mumu PID line to reduce BW

New selection for the JpsiToMuMuTagged_Detached namely

• min IP chi2 of the probe muon >20 (before it was 9)
• JPsi invariant mass window +- 175 MeV (before it was 200 MeV)
• BPV FD chi2 of the JPsi >150 (before it was 50)

Rates run over 10k 2024 minimum bias events. Efficiencies run over 1k 2024 JPsi MC sample. Rates and efficiencies with the new selection are

Line	Inclusive Rate (kHz)	Efficiency (%)
Hlt2PID_JpsiToMuMumTagged_DetachedDecision	1.14 +/- 0.36	9.8 +/- 1.2
Hlt2PID_JpsiToMuMupTagged_DetachedDecision	0.46 +/- 0.23	9.5 +/- 1.2

For comparison rates and efficiencies with the previous selection are

Line	Inclusive Rate (kHz)	Efficiency (%)
Hlt2PID_JpsiToMuMumTagged_DetachedDecision	1.25 +/- 0.38	11.1 +/- 1.2
Hlt2PID_JpsiToMuMupTagged_DetachedDecision	1.03 +/- 0.34	11.1 +/- 1.2

We are currently investigating the reason for the different rates in the MuMum line wrt MuMup. We tried to switch off the monitoring for the MuMum line, but the rate didn't change.

We also tested an upgrade MC sample.

Rates run over 10k: with the new selection they are

Line	Inclusive Rate (kHz)
Hlt2PID_JpsiToMuMumTagged_DetachedDecision	0.34 +/- 0.20
Hlt2PID_JpsiToMuMupTagged_DetachedDecision	0.34 +/- 0.20

and with the previous selection

Line	Inclusive Rate (kHz)
Hlt2PID_JpsiToMuMumTagged_DetachedDecision	0.46 +/- 0.23
Hlt2PID_JpsiToMuMupTagged_DetachedDecision	0.57 +/- 0.25