[Halld-physics] June 7 Minutes

[Ryan Mitchell]

I don't know why everything got smashed into one paragraph in that  
last email.  Trying again...

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).



On Jun 7, 2010, at 1:26 PM, Ryan Mitchell wrote:

> 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).
> _______________________________________________
> Halld-physics mailing list
> Halld-physics at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-physics

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