sPHENIX tracking discussion

[Christof Roland <christof.roland AT cern.ch>]

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

Attachment: CR_TrackingStudies_170428.pdf
Description: Adobe PDF document