Tuning of B2lphh for 2025
-
Remove 9 TTlines -
Tighten pi_PIDk cuts for two pion cases to reduce rates and bandwidth -
Add new BToL0barPpKKlines withmake_tight_kaons
Why opening this MR:
- When looking at the 2024 data, we observed that the mass resolution of \Lambda reconstructed with two T tracks is worse than expected. To save bandwidth usage, we propose removing lines related to T tracks in the 2025 data-taking.
- Since the B^+\to \bar{\Lambda}p\pi\pi lines include two pions in the final state, and the pion abundance in LHCb is significantly higher than that of kaons. we believe that tightening the two pions' PID (in
_NoPIDlines) will reduce the bandwidth by an amount greater than the increase caused by adding the B^+\to \bar{\Lambda}pKK lines. Therefore, we propose to separate the B^+\to \bar{\Lambda}p\pi\pi and B^+\to \bar{\Lambda}pKK decays into different lines.
Bandwidth b/w (GB/s) = input rate (1290 kHz for these data) x file_size (MB) / options.evt_max:
bandwidth (2024) = 1290 x 80/1024 / 250000 = 0.000403125 GB/s
bandwidth (tunning for 2025) = 1290 x 51/1024 / 250000 = 0.000256 GB/s
Rates
| Lines | Rate (kHZ)= 1290 * Eff |
|---|---|
| Hlt2BnoC_BdsToL0L0barKpKm_DDDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barKpKm_LLDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barKpKm_LLLLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barKpPim_DDDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barKpPim_LLDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barKpPim_LLLLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barPipPim_DDDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barPipPim_LLDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barPipPim_LLLLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barPpPm_DDDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barPpPm_LLDDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BdsToL0L0barPpPm_LLLLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0PmKpKp_DDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0PmKpKp_LLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0PmPipPip_DDDecisionWithOutput | 0.00516\pm0.00516 |
| Hlt2BnoC_BuToL0PmPipPip_LLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0barPpKmPip_DDDecisionWithOutput | 0.01032\pm0.0073 |
| Hlt2BnoC_BuToL0barPpKmPip_LLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0barPpKpKm_DDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0barPpKpKm_LLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0barPpKpPim_DDDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0barPpKpPim_LLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0barPpPipPim_DDDecisionWithOutput | 0.03096\pm0.01264 |
| Hlt2BnoC_BuToL0barPpPipPim_LLDecisionWithOutput | 0.0\pm0.0 |
| Hlt2BnoC_BuToL0barPpPpPm_DDDecisionWithOutput | 0.00516\pm0.00516 |
| Hlt2BnoC_BuToL0barPpPpPm_LLDecisionWithOutput | 0.0\pm0.0 |
Edited by Yingao Tang
