Re: back of the envelope

[Eugene Chudakov <gen@jlab.org>]

Hi Mark,

as far as I see these are X-Y plots (not r-phi).
I guess, the deviation between two tracking steps matters. 
The full deviation of the trajectory will be absorbed in the momentum
measurement. The bottom plot shows the range in X (close to R 
for this area) of 5cm, which is about the distance between CDC
super-layers and is about 1 step in tracking. What is the increment between
the curves' separations at this step?

Thanks,
Eugene


On Fri, 27 Feb 2009, Mark M. Ito wrote:

> Folks,
>
> At last Monday’s tracking meeting Eugene suggested that someone make an 
> estimate of the position error caused by a mistake in the knowledge of the 
> magnetic field. Here is an example: http://tinyurl.com/btp8jx
>
> -- Mark
>