sPHENIX MAPS tracker discussion

[sookhyun lee <dr.sookhyun.lee AT gmail.com>]

Hi Ming,

It is very common misconception about vertexing because of what we call it. :) 

Yes, the vertexing module actually does full tracking with 5 Helix parameters (kappa, z0, dzdl, dca and phi0 ) on Sillicon detectors. In principle, it can also be used for TPC as well. 

Let's continue discussions tomorrow. 

Best,

Sookhyun

On Tue, Oct 9, 2018, 13:25 mxliu <ming AT bnl.gov> wrote:

Hi Sookhyun,

 

I thought the MVTX and INTT tracklets are more like straight ones (in-Z for sure, in-Phi, I thought the bending is small, but I couldn’t be wrong given the very fine MVTX pixel size), so you actually fit them with helical?

I notice some discussions on your slide #8, but not sure you are talking about MVTX-INTT or INTT-TPC matching?

Looking forward your presentation tomorrow.

Cheers,

Ming

-- 

Ming Xiong Liu

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From: sookhyun lee <dr.sookhyun.lee AT gmail.com>
Date: Tuesday, October 9, 2018 at 11:53 AM
To: "Ming Liu (BNL)" <ming AT bnl.gov>
Cc: <sphenix-intt-l AT lists.bnl.gov>, sPHENIX-MVTX <sphenix-maps-l AT lists.bnl.gov>
Subject: Re: [Sphenix-maps-l] In-time vertexing with INTT

 

Hi Ming,

 

Yes, so far I only used 1 INTT layer to discriminate against out-of-time events. We certainly should reconstruct tracks using 2 MVTX hit + (2+) INTT hits at next iteration, but 2 MVTX hits only won't provide good starting curvature (for phi segmentation) or z0 parameter (for z segmentation) for INTT, thus cannot be used for in-time vertexing. I did not apply any pT cut on tracks used for vertexing.

 

Best regards,

Sookhyun  

 

On Tue, Oct 9, 2018 at 12:14 PM Ming Liu <ming AT bnl.gov> wrote:

Hi Sookhyun,

Nice work! So in your analysis, only one INTT hit was used to tag in-time association to a MVTX triplets? How about if you only use MVTX tracklet with two hits only? Have you applied any minimum momentum cuts?

 

Cheers 

Ming

Sent from my iPhone

On Oct 9, 2018, at 9:52 AM, sookhyun lee <dr.sookhyun.lee AT gmail.com> wrote:

Hello everyone, 

 

Please find my updates on in-time vertexing with INTT below.

 

https://indico.bnl.gov/event/4036/contributions/24340/attachments/20294/27121/intt_in-time_vertexing_Oct8_2018.pdf

 

Let us have discussions tomorrow at Inner tracking task force meeting as well.

 

Best regards,

Sookhyun

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