sPHENIX MAPS tracker discussion

["Liu, Ming Xiong" <mliu AT lanl.gov>]

Hi Hao-Ren,

Nice! Yes, it would be very interesting to investigate the data to better understand detector performance.

Cheers,

Ming  

 

 

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Dr. Ming Xiong Liu P-3, MS H846 Physics Division   Office: 505.667.7125 Mobile: 505.412.7396 Los Alamos National Laboratory

 

 

From: Hao-Ren Jheng <hrjheng AT mit.edu>
Date: Saturday, August 26, 2023 at 7:14 PM
To: "Ming Liu (BNL)" <ming AT bnl.gov>
Cc: SPHENIX MVTX <sphenix-maps-l AT lists.bnl.gov>
Subject: Re: [Sphenix-maps-l] Internal note on the vertex reconstruction with MVTX tracklets

 

Hi Ming,

 

Thanks for the comments and suggestions. Please find the updated note on Invenio: https://sphenix-invenio.sdcc.bnl.gov/communities/sphenixcommunity/requests/012b5364-bcca-4f29-8bc4-ac37e79941c0.

—————

1. Data:  

for future records better mention the way data were recorded: 

·         they were taken from 6/27 runs, and sensor auto-recovery was not in operation, thus a sensor remained off once it dropped off from the readout due to high beam backgrounds; 

 

Thanks for pointing this out. This information is indeed worth documenting. Please see Line 27 and 28 (and the footnote).

 

·         a unique sPHENIX global BCO number was assigned to a strove at the beginning of this strobe from the GTM/GL1, and this 

 

Updated. Please see Line 37~40.

 

2. Analysis: show the units of the variables |Delta_Z_cut| = 0.1 cm[?], |Delta_Phi_Cut| = 0.03 Rad[?]

 

Updated. Please see Line 102 and the updated plots in Fig. 14.

 

2. Suggestions :

·         We know the L0 got most backgrounds, and less in L1 and L2, have you checked the PV with L1 and L2 hits?

 

I could implement that in my current analysis setup after QM. 

 

·         Check the PV_z difference determined from two halves 

 

Some events had a large discrepancy between the two PV_z estimates, the reasons of which are still not clear to us. Since I have validated my analysis workflow in simulation and the simulation results look reasonable, I tend to think that it was the data. I don't want to make any conclusions yet, but I am curious to see what the results will be when we have better quality data.

—————

 

Best,

Hao-Ren

On Aug 25, 2023, at 23:42, Ming Liu <ming AT bnl.gov> wrote:

 

HI Hao-Ren,

Very nice progress! I have a few comments and suggestions:

 

1. Data:  

for future records better mention the way data were recorded: 

·         they were taken from 6/27 runs, and sensor auto-recovery was not in operation, thus a sensor remained off once it dropped off from the readout due to high beam backgrounds; 

·         a unique sPHENIX global BCO number was assigned to a strove at the beginning of this strobe from the GTM/GL1, and this   

 

2. Analysis: show the units of the variables |Delta_Z_cut| = 0.1 cm[?], |Delta_Phi_Cut| = 0.03 Rad[?]
3. Suggestions :

·         We know the L0 got most backgrounds, and less in L1 and L2, have you checked the PV with L1 and L2 hits?

·         Check the PV_z difference determined from two halves 

  

Cheers,

Ming 

 

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Dr. Ming Xiong Liu P-3, MS H846 Physics Division   Office: 505.667.7125 Mobile: 505.412.7396 Los Alamos National Laboratory

 

 

From: sPHENIX-MAPS-l <sphenix-maps-l-bounces AT lists.bnl.gov> on behalf of SPHENIX MVTX <sphenix-maps-l AT lists.bnl.gov>
Reply-To: Hao-Ren Jheng <hrjheng AT mit.edu>
Date: Friday, August 25, 2023 at 7:21 PM
To: SPHENIX MVTX <sphenix-maps-l AT lists.bnl.gov>
Subject: [Sphenix-maps-l] Internal note on the vertex reconstruction with MVTX tracklets

 

Dear all,

 

I have uploaded an internal note on the MVTX tracklets vertex reconstruction in the initial Au+Au data to Invenio: https://sphenix-invenio.sdcc.bnl.gov/communities/sphenixcommunity/requests/012b5364-bcca-4f29-8bc4-ac37e79941c0.

The note includes plots using data (Fig.5 and 6) that I will use in my QM poster and present in the final plot approval next Wednesday.

 

Comments and suggestions are welcome.

 

Best,

Hao-Ren

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