[Halld-physics] June 7 Minutes

[Ryan Mitchell]

Hi All,

I posted minutes from this morning on the wiki and also copied them  
below...

Ryan



1.  Background MC

* We decided we will use the OSG for background MC generation and  
storage.

* The general idea will be to (i) generate "thrown" minimum-bias  
events with Pythia; (ii) run these events through HDGeant and mcsmear;  
(iii) do partial reconstruction (at least track reconstruction); and  
(iv) store some combination of output files on the grid.  Then, one  
can either (v.a) run analysis jobs on the grid to produce root files  
(which can then be read remotely by a locally running root executable  
using URL's); or (v.b) use "wget" (or some equivalent) to fetch files  
and run analysis jobs locally.

* Ryan will try to produce some specifications for this process, which  
can then be discussed.

* As a first step, Jake and Ryan will try to generate a small sample  
of Pythia events on the OSG and then run Jake's 3pi analysis code on  
the output (following Blake's howto on the wiki).


2.  Update on IU's simulation of pi+pi-pi0

* Ryan showed a few of Jake's plots of signal MC.  The biggest  
difficulty right now seems to be with the pi0's, where there is a  
substantial combinatoric background.  Jake is working on ways to  
suppress this.

* The PID seems to be working well (but it's unclear how much the  
reconstruction code is "cheating").  Simon and David are still working  
on the PID code.  There was some discussion about which start time to  
use for TOF.  Richard will check to see what is currently being used  
(true event start time vs machine time vs tagger time).
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