Minutes of Hadron analysis meeting [07/01/2021]
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*Participants: Camillo Mariani, Tom Junk, Leigh Whitehead, Xianguo Lu, Libo Jiang, Mattia Fani,
Norman Martinez, Jonathon Sensenig, Kang Yang, Heng-Ye Liao
*Time: 10:30-11:04
*Host: Camillo
*Minutes taker: Heng-Ye
Agenda: round-table update + Mattia's presentation
Announcement:
Our group will give a summary report in the DRA meeting on July 14.
For the analyzers, please send Camillo & Heng-Ye 3-4 slides about the summary of your recent work
and what you plan to achieve before the next collaboration meeting (1-2 sentences are enough) before next Monday (July 5).
Round-table update:
*Libo
-Has already presented some work in the DRA meeting this week
-Focused on machine learning algorithms
+Training samples completed, compared the efficiencies of various algorithms
Question from Camillo to Tom:
Camillo: Do you know if there is any long-term plan to try to implement the energy loss in the beam entrance/beam plug?
Tom: Do not know if there is any plan personally. WenQiang is the leader of the simulation group, you may want to forward this request to him.
Probably change the geometry in MC. I think one could also in the analysis stage to hack that in.
To simulate the effect, you have to change the geometry.
Camillo: We should think one of the other. Long term the best is to change the MC geometry as you just suggested.
Tom: I was talking with TingJun about the effect of the efficiency on the XS measurement.
All the upstream stuff that is invisible, affects the normalization of the data sample but it does not affect the measurement, because you care about the eff. as func. of track length. But it does affect the incoming momentum spectrum that be sure to have it in the model, or any shower in the background.
Camillo: We can make a note with HengYe and me, to contact the simulation group and to discuss with TingJun when he is back next week.
Leigh: It may not be straightforward to make the material budget in the MC. These are tough things to get them right. If I remembered it correctly, LArIAT work on it for quite a long time as well.
Tom: You always have to apply some correction in the analysis stage. Because simulation will never be exactly right. Even if it matches, you will still have some residual uncertainties.
*Heng-Ye
-Proton Inel. XS measurement
+Will give a presentation next week
*Kang
-Pi0 kinematic fitting to improve pi0 reco.
+Has presented the work in the EM shower meeting, can make a presentation after next week
-Study low energy photon reco.
Based on the TKI study, the photons' decay from pi0 always has a lot of missing energies.
Working with TingJun, generated MC samples of isotropic, monoenergetic energy photons (2GeV, 1 GeV, and 300 MeV)
*Mattia
-Presentation (see slides)
Tom: (suggestions about the missing energy on calorimetric reco.)
From the Michael analysis, a lot of energies fly away from a track when you have a little shower, photons make Compton scatters. It could be delta rays that deposited energies far away from the track.
Geant simulates delta rays but there is a cut, below the certain cuts in energy, Geant closes the ionization and lost in simulating delta rays (therefore energy loss). Mike Mooney has done some studies with Alex Fisher on the recombination simulation, for the ionization v.s. delta rays. He found that by varying this cut, you might get a different averaged recombination. You might ask Mike about the recombination simulation.
The recombination factor is a big deal, 60-70% on the charge that drifts. That could drag the simulation wrong.
Can also refer to Abbey's work on recombination.
*Norman
-Working on the control plots for the proton mass production, learning on making SCE corrections
*John
-Analysis goal: measure diff. XS for the pion charge exchange (CEx) at 2 GeV
+Generated monogenetic 2 GeV pions
+Working on pion CEx event selection
-> Challenge met so far: Quite a few pion daughters that get classified as showers in the CNN score,
working on figuring out a way to identify them.