HLT2 lines to monitor HLT1 KS lines
The MR adds 5 new HLT2 lines.
| Line | HLT2 TOS eff w.r.t. HLT1-filtered events | Rate | Prescale |
|---|---|---|---|
Hlt2DpToPipPimPipLine |
(55 +- 1)% | (86 +- 10) Hz | 2e-4 |
Hlt2DpToKsPip_KsToPipPimLine |
(19 +- 4)% | (84 +- 32) Hz | 2e-3 |
Hlt2InclKsKs_KsToPipPimLine |
(10 +- 4)% | (110 +- 20) Hz | 1e-2 |
Hlt2Passthrough_KsToPipPimLine |
--- | (13 +- 3) Hz | 1e-4 |
Hlt2Passthrough_V0DownstreamLine |
--- | (25.2 +- 0.1) Hz | 1e-6 |
These lines are used to select nearly HLT2-unbiased samples of decays (very loose HLT2 selections), and to measure the relative behaviour (efficiency, S/B ratio for Ks candidates) of the new TwoTrackKs HLT1 line with respect to the [Two]TrackMVA lines.
Hlt2DpToPipPimPipLine and Hlt2DpToKsPip_KsToPipPimLine
The lines search for D+ -> pi+ pi+ pi- and D+ -> KS0 pi+ candidates.
In both the event is required to be TOS HLT1 level on TrackMVA|TwoTrackMVA|TwoTrackKs.
NOTICE: efficiency for Hlt2DpToPipPimPipLine has been computed on a MC sample with TightCuts at generation level, so it could be lower than what is reported here. A new sample is under production.
Hlt2InclKsKs_KsToPipPimLine
The line searches for X0 -> KS0 KS0 candidates, looking for candidates in a large X0 mass window. The event is required to be TOS HLT1 level on TrackMVA|TwoTrackMVA|TwoTrackKs.
The purpose is to collect events from D0 -> KS0 KS0, B0 -> KS0 KS0, Chi_c0(1p) -> KS0 KS0.
Hlt2Passthrough_KsToPipPimLine
The line collects KS0 -> pi+ pi- candidates. Also here the event is required to be TOS HLT1 level on TrackMVA|TwoTrackMVA|TwoTrackKs.
It allows to check whether distributions of strategical variables looks as expected or not (and promptly tune selections if needed). Efficiency is not reported, since the line is substantially triggering on "background".
Hlt2Passthrough_V0DownstreamLine
The line collects inclusive V0 -> pi+ pi- Downstream candidates, without applying any selection on the 2-track candidate. The events is required to trigger the HLT1 passthrough line, in order to avoid any possible bias by HLT1. The line is aimed at collection of a background sample for studies on Downstream candidates. Efficiency is not reported, since the line is substantially triggering on "background".
Because of the loose selections large prescaling factors are applied in all the lines.