Stripping

Stripping is the idea of only fully reconstructing interesting decays, which can easily be accessed afterwards. It can cause a lot of pain, though…

A lot of documentation can be found under: https://twiki.cern.ch/twiki/bin/view/LHCb/LHCbStripping

To know how to access your line in your options file, you have to know the name of it. To find this out, do the following:

• Find out in which stream it is (Dimuon, Dielectron, EW,…)
• Execute the following script:

SetupProject DaVinci vXrYpZ
python
from StrippingSettings.Stripping12 import StreamCalibration
locations = {} 
for line in StreamCalibration.stream.lines :
   locations[ line.name()] = str(StreamCalibration.stream.name()) + '/' + str(line.outputLocation())
for line, loc in locations.iteritems() : 
   print line, loc

• This will give you something like: StrippingDiMuonIncLine Dimuon/Phys/DiMuonIncLine, where the first one is your line and the second one the location.

From Stripping 13 on, you have to do something like:

from StrippingSelections.Utils import buildStreams
streams = buildStreams('Stripping13')
 
for stream in streams:
    if(stream.name() == "Calibration"):
        for line in stream.lines :
           print line.name(), "\t", line.outputLocation()

To access the event, you have to set the correct path, f.ex:

MyParticles = DataOnDemand(Location = '/Event/Dimuon/Phys/DiMuonIncLine')

or you can set the RootInTES …

MyParticles = DataOnDemand(Location = 'Phys/DiMuonIncLine')
MyGaudiSequence.RootInTES = "/Event/Dimuon"

Note that you should not set RootInTES in the stripping, as it can cause problems (but can be useful for debugging sometimes).

First you have to make sure, the SDSTs as well as the RAW files are accessible and are staged in (as in the test-samples). In ganga then you can do the following (in addition to the usual things):

j.inputdata = DaVinci().readInputData('/someDirectory/something_SDST.py')
j.inputdata.depth = 2

where it is crucial that you set j.inputdata.depth = 2 to make sure the RAW files can be accessed.