Difference between revisions of "Long term items"

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# FCAL: [orphan item] It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See [https://logbooks.jlab.org/entry/3595928 Log Entry 3595928] and references.  Several runs have been taken in raw mode.  These runs exhibit the shift in pi0 mass with LED running at 1 kHz.  There is a need to analyze these to try to determine the cause.  Susan will undertake this task.
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# FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See [https://logbooks.jlab.org/entry/3595928 Log Entry 3595928] and references.  Several runs have been taken in raw mode.  These runs exhibit the shift in pi0 mass with LED running at 1 kHz.  There is a need to analyze these to try to determine the cause.  [Susan]
 
##50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
 
##50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
 
##50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
 
##50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
 
##50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events
 
##50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events
# Tegan's  work on comparing G3 (HADR1 and HADR4) and G4: he is running photon, pi+, pi-, proton particle guns, ρ events and π-Δ++ events. This effort started with Colin's [https://github.com/JeffersonLab/HDGeant4/issues/111#issuecomment-657062174 observations on acceptance for the eta-pi] and continued with Sean's [https://github.com/JeffersonLab/HDGeant4/issues/179 observations on proton timing], which Lubomir reported in J/psi production. Data vs MC tails look ok (in G4 and G3H4).  Work is ongoing: Tegan will look at Gaussian part of peaks (to see if tighter cuts can be used). See plots at [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4878 GlueX-doc-DB] and [https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meetings HDGEANT4 meeting] notes.
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# Hadronic split off studies (work started for FCAL and FCAL-II in the JEF experiment)
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# Covariance matrices for photons; need pull distributions (Regina could help); add these to best practices page [Mark]
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# Spike at BCAL z=220 cm, due to noise [Karthik]
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# Neutrons: revisit past work and move forward; could look at neutron efficiency in hyperon channels, etc. [Tegan et al.]

Revision as of 17:44, 1 October 2021

  1. FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See Log Entry 3595928 and references. Several runs have been taken in raw mode. These runs exhibit the shift in pi0 mass with LED running at 1 kHz. There is a need to analyze these to try to determine the cause. [Susan]
    1. 50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
    2. 50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
    3. 50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events
  2. Hadronic split off studies (work started for FCAL and FCAL-II in the JEF experiment)
  3. Covariance matrices for photons; need pull distributions (Regina could help); add these to best practices page [Mark]
  4. Spike at BCAL z=220 cm, due to noise [Karthik]
  5. Neutrons: revisit past work and move forward; could look at neutron efficiency in hyperon channels, etc. [Tegan et al.]