Re: motivation for tracking resolution

[David Lawrence <davidl@jlab.org>]

Hi Elton,

    One thing you might consider is using the geant simulation to 
directly calculate the covariance matrix at each detector plane. It 
would take very few events and it would seem more realistic than I think 
you can get with the direct calculation since it would include a more 
precise distribution of the materials. One can then combine these to get 
the covariance at the vertex so you essentially get what you need for 
both 1 and 5. Just a thought.

Regards,
-David

Elton Smith wrote:
> This morning Curtis, Alex, Mark and I met to think about what parametric
> studies might be useful to study tradeoffs in resolution for different
> amounts of material and position resolution.
>
> We have the following suggestion:
> 1. Update the parametric representation for resolution (polynomial
> fits) that currently exists to one that includes parameters that can be
> interpreted physically in terms of material and position resolution.
> 2. Generate a four-pion events with two of the pions representing a narrow
> resonance with variable mass. Scanning this mass can give us two-pion mass
> resolution for charged tracks over a range of masses.
> 3. Generate Phythia events with similar topoly for merging with the
> "signal" events above to study the effect of signal to background and
> resoltuion.
> 4. Alex will start on process 2&3 and Elton and Mark will develop 1 for
> input into the simulation.
> 5. CMU will use 1 to generate an error matrix that can be used for
> kinematic fitting of the same events, and repeat the exercise 3 using
> kinematic fitting.
>
> From there we can work toward including neutrals in the sample to study
> reconstruction of events with pi+pi-pi0 such as omegas.
>
> Comments/suggestions?
>
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave
> Suite # 16
> Newport News, VA 23606
> elton@jlab.org
> (757) 269-7625
>   

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