sPHENIX tracking discussion

[David Morrison <dave.patrick.morrison AT gmail.com>]

Hi Christof,

That looks very encouraging – and makes sense too.

Dave

On 4/28/17 9:50 AM, Christof Roland wrote:
> Hi Everybody, 
> 
> I had a look at the seeding/tracking efficiency. 
> 
> As suspected in the last meeting it turns out that the seeding layers are 
> not really hermetic.
> Especially the INTT layers are not 100% efficient, which is probably to be 
> expected. 
> This in turn means the the current seeding requirement of 8 out of 8 layers 
> hit is
> responsible for a large part of the inefficiency we saw in the kalman 
> tracking. 
> 
> Releasing the number of hit requirement in the seeding step from 8 out of 8 
> to 
> 6 out of 8 hits increases the single track reconstruction efficiency from 
> ~86% to ~98%
> 
> Please see the attached plots below.
> 
> In the region below 1 GeV the 6 out of 8 seeding scheme results in some 
> segmentation 
> violations. We'll have to take a look at that.
> 
> Cheers
> 
>    Christof 
> 
> 
> 
> 
> 
> 
> 
> 
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