[Frost] What do the intercepts mean in ELoss Correction?
Eugene Pasyuk
pasyuk at jlab.org
Fri May 7 17:51:43 EDT 2010
Hi Sung,
Those functions do exactly what the name says: find coordinates of an
intercept of a straight line (track) with various surfaces (plane,
cylinder, cone, sphere). This has nothing to do with physics, this is
pure 3D geometry, nothing more.
In case of plane it can be only one or none intercepts.
In case of second order surfaces it could be none, one or two
intercepts. It can't be more than two.
Yes, those are solutions of quadratic equation.
What you wrote is exactly the same: x/a/2 = x/(a*2)
-Eugene
On 5/7/10 5:10 PM, Sungkyun Park wrote:
> Hi Eugene,
>
> Now I do not still have a solution about the reduction of the number of events after applying eloss correction in the CH2 target. I check the current of eloss correction in each event.
>
> In the Fortran code, intersept.F (which is located in our packages/eloss/)
>
> What is the intercept? I think this concept may be related of the interaction but basically the interaction position is the vertex position. I do not understand the exact meaning of the intercept.
>
> In our code, There are no intercept, one intercept, and two intercepts.
> Why can three intercept not be existed?
>
> Another thing is that in the same code, there are equations to find k1 and k2.
> k1 = ( -b + sqrt(delta) ) / a / 2
> k2 = ( -b - sqrt(delta) ) / a / 2
>
> I think these may be a solution of quadratic equation. are these values right?
> If they are their solution, I think the following equations are right.
>
> k1 = ( -b + sqrt(delta) ) / ( a * 2 )
> k2 = ( -b - sqrt(delta) ) / ( a * 2 )
>
> Beat Wishes
>
> Sung
> Florida State University
>
>
>
>
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