Add PbH2 sequences with unprescaled SMOG minbias lines
This MR adds new sequences for the Pb-H2 data taking.
This sample is to be taken with minimum bias trigger. The SMOG Hadronic line requires ECALE>94GeV, and since maximum ECALE value expected in PbH2 collisions vs PbNe or PbAr, a looser version of the line is preferable to not affect integrated cross-section measurements.
Options:
- Hlt1HeavyIonPbSMOGMBOneTrack: require 1 VELO track in SMOG
- Hlt1HeavyIonPbSMOGMicroBias: require 1 PV in SMOG
- Hlt1HeavyIonPbSMOGHadronic: require 1 PV in SMOG and ECALE>94Ge
As input on rates, they obtained from Monet on representative runs from 2024:
| Line | Rate NOSMOG kHz | Rate SMOGAR kHz | Prescale |
|---|---|---|---|
| Hlt1HeavyIonPbSMOGMBOneTrack | 0.97 | 27 | 0.01 |
| Hlt1HeavyIonPbSMOGMicroBias | 0.001 | 0.37 | 0.01 |
| Hlt1HeavyIonPbSMOGHadronic | 0.1 | 33kHz | 1 |
An Hlt1HeavyIonPbSMOGMBOneTrack unprescaled line would have a rate of 97kHz even without SMOG, rather high, probably from Pb EM background. Rate is controled with the MicroBias line. The effect of the line cuts are tested in expected 2025 local simulation with Pb-H2 beam:
The proposed strategy is to remove the prescale of the Hlt1HeavyIonPbSMOGMicroBias line, and change the prescale of the onetrack line to 0.1 so it can be used to study PV reconstruction efficiency with high statistics.
Added sequences were tested locally, allen outputs can be found here:
hlt1_PbPb_PbH2_forgas_veloSP.log
Rates are increased in the target lines as expected (note rates of most lines are 0 for Retina sequences as test files have rawbanks decoded with SP).