diff --git a/18-hlt-intro.md b/18-hlt-intro.md index 04e308b..840fb4b 100644 --- a/18-hlt-intro.md +++ b/18-hlt-intro.md @@ -1,8 +1,8 @@ --- layout: page -title: First steps in LHCb +title: Second steps in LHCb subtitle: HLT intro -minutes: 45 +minutes: 75 --- > ## Learning Objectives {.objectives} @@ -43,16 +43,16 @@ available in HLT2 is the same as the offline reconstruction, physics analysis can be done with the candidates created in HLT2. If a line is configured to be a Turbo line, all information on the candidates that it selects is stored in the raw event. These candidates can be resurrected later by the Tesla application and -written to a microDST. This is similar to stripping streams that go to -microDST, where only candidates that are used in passing selections are -available to analysts. The Turbo stream is different because information that +written to a microDST. This is similar to stripping streams that go to +microDST, where only candidates that are used in passing selections are +available to analysts. The Turbo stream is different because information that is not saved is lost forever. We will now have a look at some of the candidates stored by the HLT. We will use the script we [used last time](http://lhcb.github.io/first-analysis-steps/05-interactive-dst.html) as a starting point, and the file `root://eoslhcb.cern.ch//eos/lhcb/user/r/raaij/Impactkit/00051318_00000509_1.turbo.mdst`. -This file contains some 2016 Turbo events from [run +This file contains some 2016 Turbo events from [run 174252](http://lbrundb.cern.ch/rundb/run/174252/). Fire up your favourite editor, open the script and save a copy to work on as `hlt_info.py`. There are a few things in the script that we don't need and can @@ -75,7 +75,7 @@ decision. This can be done using the `decision` member function of a ~~~ {.python} reports = evt['Hlt1/DecReports'] -report = reports.decReport('Hlt1TrackAllL0Decision') +report = reports.decReport('Hlt1TrackMVADecision') print report.decision() ~~~ @@ -83,7 +83,7 @@ The HLT1 selections that are most efficient for hadronic charm and beauty decays in Run 2 are called Hlt1TrackMVA and Hlt1TwoTrackMVA. Use the advance function to find an event that was accepted by either of these trigger selections. -The DecReports only contains the decisions for each line, 1 or 0. The +The DecReports only contains the decisions for each line, 1 or 0. The candidates themselves are stored in the SelReports ("Hlt{1,2}/SelReports"). Get the HLT1 SelReports from the event store and retrieve the one for one of the TrackMVA selections using the selReport function,