Hello,
In order to speed up further the analysis we can now have a filtered
(or fast) lrn ntuple for physics analysis like e.g. the asymmetry.
The criterium is to filter out only those events that have a newton
reconstruction. These are the only events you really need for physics
anyways. Unfortunately the cut is hardwired but this seems not to be
a terrible difficulty. At the moment flrn.C requests both a left a right
sector track so a different definition will be used for neutrons (that
will be discussed tomorrow). Thanks to our consistent definition of
trigger types it will be easy to implement a filter for runs with 0/1/2
tracks per sector.
The result is that while it took 25 minutes this weekend to go through
show_ep_asym.C for a bunch of runs, it now took me less than 1.
Of course this did not change the asymmetry "result" whatever that is
right now. Again, many thanks to VZ, CC that spent part of their time
setting this up.
To generate a flr ntuple do "> root flrn.C ####". The output goes to
"root_ntuple/flr-####.root" and you can chain files by calling
./utils/filtered.C in your macro which sets the ntuple name and then
calls init.C (similarly to the call to lr.C). I updated show_ep_asym.C
so have a look there. You need to update other macros if you want to
make use of these fast features.
The old lr ntuples still exist as we need them to study background and
wire chamber efficiency.
-- t
________________________________________________________________________________
Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
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