sPHENIX tracking discussion

[Anthony Frawley <afrawley AT fsu.edu>]

Hi Chris,

Hopefully we are talking about misalignments at the level of < 1 mm. In any case, I think we will be able to assess how well it works with carefully designed tests of embedding in Hijing events, where we use different GEANT geometry for the simulated probe relative to the Hijing event.

If it does not work well, it does not work well. But the cost of not using a constant simulation geometry is high. In the end, we may have to adopt a compromise solution.

Tony

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From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of pinkenburg via sPHENIX-tracking-l <sphenix-tracking-l AT lists.bnl.gov>
Sent: Tuesday, August 30, 2022 4:53 PM
To: sphenix-tracking-l AT lists.bnl.gov <sphenix-tracking-l AT lists.bnl.gov>
Subject: Re: [Sphenix-tracking-l] Embedding simulated tracks in real data

 

Hi Tony,

I don't see that shifting the hits after the fact is a viable option for the embedding. You generate the sims using the "wrong" material locations and then shift the hit positions. This likely works for tracking but if you consider the effects of this on simulations at large you run very quickly into trouble with this approach. Secondaries from interactions with material will be produced in the wrong place, heat maps looking for support structures won't match and so on.

Chris

On 8/30/2022 1:48 PM, Anthony Frawley via sPHENIX-tracking-l wrote:

Hi All,

Following the discussion at yesterday's tracking software meeting, I have updated my slides on de-aligning and aligning sPHENIX tracking at:

https://indico.bnl.gov/event/16867/

The new slides 9 and 10 outline how I think we can embed simulated tracks in real data without modifying the simulation geometry.

Tony

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Christopher H. Pinkenburg	;    pinkenburg AT bnl.gov
				;    http://www.phenix.bnl.gov/~pinkenbu

Brookhaven National Laboratory	;    phone: (631) 344-5692
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