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Tuning of B2lphh for 2025

  • Remove 9 TT lines
  • Tighten pi_PIDk cuts for two pion cases to reduce rates and bandwidth
  • Add new BToL0barPpKK lines with make_tight_kaons

Why opening this MR:

  1. 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.

  1. 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 _NoPID lines) 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

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