sPHENIX HCal discussion

[Abhisek Sen <sen.abhisek AT gmail.com>]

Hi Craig, Jonh and Anne,

    Here are the requested plots. 

HCAL *ONLY* e/pi without sim curve:

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/HCAL_standalone_eoverpi_nosim.pdf

sPHENIX (EMCAL+HCAL) e/pi plots:

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/sPHENIX_hadron_eoverpi.pdf

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/sPHENIX_hadron_eoverpi_nosim.pdf

EMCAL and HCAL calibrations were optimized for hadrons and used for electron measurement to make e/pi plots. MTest beam composition has only few hadrons in lower energy. So below 6GeV hadron measurements are poor. I am not sure about Geant's ability to quantify e/pi but the difference between simulation and data is quite significant.

 There are still several drawbacks, some may improve later:

1/ I dont have EMCAL cuts optimized for electrons. When I add all 64 towers (UIUC+THP), I get a resolution of 24%/sqrt{E}. I will dig more into EMCAL analysis to get a better electron spectra.

2/ Electrons are mostly in EMCAL while hadrons are mostly measured in HCAL. So hadron measurement affected by the saturation issue in HCAL while electrons are not. 

3/ HCAL has its own intrinsic e/pi which is not included while making EMCAL+HCAL e/pi.

Cheers,

Abhisek

On Sun, Oct 30, 2016 at 12:43 AM woody <woody AT bnl.gov> wrote:

Hi Abhisek,
   I agree with John and that it only makes sense to show the e/pi ratio for the EMCAL + HCAL (inner + outer) combined.

Cheers,
Craig

On 10/29/2016 1:16 PM, John Lajoie wrote:

Hi Anne, Abhisek:

    One quick addition -

    The plot listed below is for the HCAL *only*. For Anne's talk I think what the audience will be most interested in is the measured e/pi for the *full* calorimeter (EMCal + HCAL). Abhisek, can you make this plot for Anne, without a simulation curve and with "sPHENIX Preliminary".

John

On 10/29/2016 1:01 PM, Sickles, Anne M wrote:

Hi Abhisek,

I talked to John L, John H, and Jin and we’d like to show the e / pi ratio without the simulation on Tuesday.  Can you update the plot?

Best,

Anne

On Oct 28, 2016, at 3:07 PM, Abhisek Sen <sen.abhisek AT gmail.com> wrote:

Hello HCALers,

   Anne's IEEE talk is next week. So I have added "sPHENIX preliminary" label to HCAL plots for everyone to review. Please let me know if you have comments. 

HCAL Standalone plots:

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/HCAL_standalone_signal.pdf

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/HCAL_standalone_res.pdf

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/HCAL_standalone_linearity.pdf

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/HCAL_standalone_eoverpi.pdf

HCAL+EMCAL hadron measurement plots:

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/sPHENIX_hadron_signal.pdf

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/sPHENIX_hadron_res.pdf

http://www.phenix.bnl.gov/WWW/publish/abhisek/sphenix/preliminary/sPHENIX_hadron_linearity.pdf

Please refer to testbeam paper for analysis details. Few comments:

1/ The nonlinearity observed in HCAL is a preamp saturation effect. A suggestion during the HCAL workfest was to remove the saturation points and rerun the analysis to improve the linearity. We made a new production but results were same. I think the fitting changes were not included. Jin is looking more into it. We will likely have one more new production.

2/ I intentionally did not add e/pi plot for sPHENIX configuration. That needs more internal discussion. 

Please let me know if you have any comments.

Cheers,

Abhisek

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--------------------------------------------------------------

Anne Sickles

Assistant Professor, Department of Physics

University of Illinois at Urbana-Champaign

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--

John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

Contact me: john.lajoie

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