Inclusive detached dilepton mva rate reduction
Reducing the minbias rate/bandwidth of the Inclusive detached dilepton MVA trigger lines. Especially tightening the dielectron selection
Minbias rate calculated using hlt1 filtered 2024 minbias simulation. lhcb/wg/rta/WP3/bandwidth_division/Beam6800GeV-expected-2024-MagDown-nu7.6/hlt1_filtered/30000000/input_x.dst
| Trigger line | Inclusive rate / kHz | Exclusive rate / kHz |
|---|---|---|
| e^+ e^- \ (OS) | 0.96000 +/- 0.3392 kHz | 0.48000 +/- 0.2399 kHz |
| e^+ e^- \pi^+ \ (OS) | 0.96000 +/- 0.3392 kHz | 0.12000 +/- 0.1199 kHz |
| e^+ e^- \pi^+ \ (SS) | 0.72 +/- 0.2938 kHz | 0.0 +/- 0.0 kHz |
| e^+ e^- \pi^+ \pi^- \ (OS) | 1.08 +/- 0.3598 kHz | 0.12000 +/- 0.1199 kHz |
| e^+ e^- \pi^+ \pi^- \ (SS) | 0.96000 +/- 0.3392 kHz | 0.12000 +/- 0.1199 kHz |
| e^+ e^- \ (SS) | 0.36 +/- 0.2078 kHz | 0.24000 +/- 0.1696 kHz |
| e^+ e^- N \ (OS) | 1.55999 +/- 0.4323 kHz | 0.48000 +/- 0.2399 kHz |
| e^+ e^- N \ (SS) | 1.32 +/- 0.3977 kHz | 0.36 +/- 0.2078 kHz |
| e^+ \mu^- \ (OS) | 0.24000 +/- 0.1696 kHz | 0.12000 +/- 0.1199 kHz |
| e^+ \mu^- \pi^+ \ (OS) | 0.24000 +/- 0.1696 kHz | 0.0 +/- 0.0 kHz |
| e^+ \mu^- \pi+ \ (SS) | 0.24000 +/- 0.1696 kHz | 0.0 +/- 0.0 kHz |
| e^+ \mu^- \pi+ \pi^- \ (OS) | 0.24000 +/- 0.1696 kHz | 0.12000 +/- 0.1199 kHz |
| e^+ \mu^- \pi+ \pi^- \ (SS) | 0.12000 +/- 0.1199 kHz | 0.0 +/- 0.0 kHz |
| e^+ \mu^- \ (SS) | 0.24000 +/- 0.1696 kHz | 0.12000 +/- 0.1199 kHz |
| e^+ \mu^- N \ (OS) | 0.24000 +/- 0.1696 kHz | 0.12000 +/- 0.1199 kHz |
| e^+ \mu^- N \ (SS) | 0.12000 +/- 0.1199 kHz | 0.0 +/- 0.0 kHz |
| \mu^+ \mu^- \ (OS) | 1.08 +/- 0.3598 kHz | 0.72 +/- 0.2938 kHz |
| \mu^+ \mu^- \pi^+ \ (OS) | 0.36 +/- 0.2078 kHz | 0.12000 +/- 0.1199 kHz |
| \mu^+ \mu^- \pi^+ \ (SS) | 0.24000 +/- 0.1696 kHz | 0.0 +/- 0.0 kHz |
| \mu^+ \mu^- \pi^+\pi^- \ (OS) | 0.12000 +/- 0.1199 kHz | 0.0 +/- 0.0 kHz |
| \mu^+ \mu^- \pi^+ \pi^- \ (SS) | 0.12000 +/- 0.1199 kHz | 0.0 +/- 0.0 kHz |
| \mu^+ \mu^- \ (SS) | 0.48000 +/- 0.2399 kHz | 0.24000 +/- 0.1696 kHz |
| \mu^+ \mu^- N \ (OS) | 0.24000 +/- 0.1696 kHz | 0.0 +/- 0.0 kHz |
| \mu^+ \mu^- N \ (SS) | 0.24000 +/- 0.1696 kHz | 0.12000 +/- 0.1199 kHz |
| Total | 7 +/-0.9 kHz |
This is a reduction from the current rate of 11 +- 1 kHz
Assuming an events size of 200 kB this corresponds to a bandwidth of 1.33 GB/s
HLT2 Selection efficiencies (CanRecoChildren) for a selection of important decays after tightening the selection
| Decay | Dimuon eff | Dielectron eff | MuE eff |
|---|---|---|---|
| B^{0} -> ( K^{*0}(892) -> K+ \pi- ) \mu+ \mu- | 0.463 +/- 0.031 | ||
| B^{0} -> ( K^{*0}(892) -> K+ \pi- ) e+ e- | 0.278 +/- 0.033 | ||
| B^{0} -> ( K^{*0}(892) -> K+ \pi- ) \mu+ e- | 0.441 +/- 0.051 | ||
| B+ -> K+ \mu+ \mu- | 0.543 +/- 0.024 | ||
| B+ -> K+ e+ e- | 0.396 +/- 0.030 | ||
| B+ -> K+ e+ \mu- | 0.409 +/- 0.037 | ||
| Bs0 -> \mu+ \mu- | 0.627 +/- 0.022 | ||
| Bs0 -> e- \mu+ | 0.550 +/- 0.033 | ||
| Bs0 -> e+ e- | 0.507 +/- 0.025 |
HLT2 Selection efficiencies (CanRecoChildren) for some important decays with the current selection in the master branch
| Decay | Dimuon eff | Dielectron eff | MuE eff |
|---|---|---|---|
| B^{0} -> ( K^{\star 0}(892) -> K+ \pi- ) \mu+ \mu- | 0.471 \pm 0.031 | ||
| B^{0} -> ( K^{\star 0}(892) -> K+ \pi- ) e+ e- | 0.299 \pm 0.033 | ||
| B^{0} -> ( K^{\star 0}(892) -> K+ \pi- ) \mu+ e- | 0.452 \pm 0.052 | ||
| B+ -> K+ \mu+ \mu- | 0.552 \pm 0.023 | ||
| B+ -> K+ e+ e- | 0.427 \pm 0.031 | ||
| B+ -> K+ e+ \mu- | 0.432 \pm 0.037 | ||
| Bs0 -> \mu+ \mu- | 0.627 \pm 0.022 | ||
| Bs0 -> e- \mu+ | 0.571 \pm 0.033 | ||
| Bs0 -> e+ e- | 0.535 \pm 0.025 |
Tightening the selection leads to the loss of about 1-3 % points in signal efficiency depending on the mode