sPHENIX EMCal discussion

["Huang, Jin" <jhuang AT bnl.gov>]

Hi, Virginia

 

Thank you very much for the immediate update.

 

Here are two more comments  :-)

 

1.       The 1 GeV energy spectrum appear contains some background towards the high ADC side that drive the fit wider. I would suggest remove this point from the dE/E vs E fit.

2.       A minor thing: the 2 GeV and 3 GeV energy spectrum points show double curves at the peak, e.g. page 6. It could indicate that somehow the x-binning is coupled to the discretization of ADC. It drive Chi2/ndof to arbitrary high values. I would suggest try different binning, e.g. 5.0 or 10.0 ADC units / bin, as a test to investigate this issue.

 

Cheers,

 

Jin

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: Bailey, Virginia Ruth [mailto:vbailey2 AT illinois.edu]
Sent: Thursday, September 8, 2016 12:58 PM
To: Huang, Jin <jhuang AT bnl.gov>; sphenix-emcal-l AT lists.bnl.gov
Subject: RE: PbGL Testbeam Analysis

 

Hi Jin,

 

The reason the two are different is that there were actually two 1GeV runs at 1200V, but one of them, run 2300, had a strange looking energy distribution (see attached) so I excluded it from the plot.  I forgot to exclude it from the combined runs though, which I have now fixed.

 

Thanks for catching that!

Best,

Virginia

---

From: Huang, Jin [jhuang AT bnl.gov]
Sent: Thursday, September 08, 2016 10:06 AM
To: Bailey, Virginia Ruth; sphenix-emcal-l AT lists.bnl.gov
Subject: RE: PbGL Testbeam Analysis

Hi, Virginia

 

Thank you for the update. Nice job!

 

Meanwhile, could you double check 1200V point at 1 GeV/c? It apparently jumps from 9.5% on page 7/8 to 6.4% on page 10.

 

Cheers

 

Jin

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: sphenix-emcal-l-bounces AT lists.bnl.gov [mailto:sphenix-emcal-l-bounces AT lists.bnl.gov] On Behalf Of Bailey, Virginia Ruth
Sent: Thursday, September 8, 2016 10:37 AM
To: sphenix-emcal-l AT lists.bnl.gov
Subject: [Sphenix-emcal-l] PbGL Testbeam Analysis

 

Hello all,

 

Attached are some slides documenting the analysis of the lead glass runs from the testbeam.  We used the same analysis macro used for finding the resolution of the calorimeter to find the PbGL resolution, both individually for the 1100V runs and 1200V runs and with the two sets combined.  Let me know if you have any questions or comments.

 

Best,

Virginia