MILO VERMEULEN — 19-12-2019 Π 0 PLANS FOR 2020
Π 0 PLANS FOR 2020 — 19-12-2019 Π 0 S IN 2019 ▸ Truth utilities linking MC to reco and vice versa ▸ General purpose π 0 information extraction module ▸ protoduneana/protoduneana/singlephase/ EMTaskForce/ProtoDUNEPizeroAnaTree_module.cc ▸ Single / double shower reconstruction efficiency ▸ Track contamination of showers ▸ Catching shower hits in 3D cones
Π 0 PLANS FOR 2020 — 19-12-2019 Π 0 S IN 2020 ▸ PhD deadline 1-9-2020 ▸ End goal: π 0 invariant mass peak in ProtoDUNE data ▸ Handles: ▸ Shower pair topology ▸ Shower dE/dx?
Π 0 PLANS FOR 2020 — 19-12-2019 Π 0 S IN 2020 — DE/DX ▸ Distinguish between e +/- and γ shower ▸ Photon shower: effectively two overlapping e +/- showers e + e - shower γ e +/- shower
Π 0 PLANS FOR 2020 — 19-12-2019 Π 0 S IN 2020 — DE/DX ▸ MIP ~ 2.12 MeV/cm (https://lar.bnl.gov/properties/) ▸ Photon should have dE/dx ~ 4.24 MeV/cm ▸ Not what we see so far All dE/dx 700 Most energetic shower dE/dx Least energetic shower dE/dx 600 500 400 300 200 100 0 0 1 2 3 4 5 6 7 8 9 10 Shower dE/dx [MeV/cm] Old plot just for illustrative purposes
Π 0 PLANS FOR 2020 — 19-12-2019 Π 0 S IN 2020 — DE/DX ▸ Single MIP photon showers could be due to asymmetric e + e - production ▸ Shower MC information discarded by default ▸ Could look into extra charge deposition at very start of shower by least energetic electron/positron (~2cm) e + e - shower γ
Π 0 PLANS FOR 2020 — 19-12-2019 Π 0 S IN 2020 — SHOWER PAIR TOPOLOGY ▸ π 0 shower pair must ideally ▸ consist of two photon showers (decided via dE/dx?) ▸ point toward a common vertex (with a certain error) ▸ both start close to this vertex ( γ mean free path ~ 18 cm) ▸ produce an invariant mass close to that of π 0
Π 0 PLANS FOR 2020 — 19-12-2019 Π 0 S IN 2020 — SHOWER PAIR TOPOLOGY ▸ MC studies must produce distributions for these variables ▸ Using true π 0 occurrences ▸ Apply multivariate analysis on ProtoDUNE data
Π 0 PLANS FOR 2020 — 19-12-2019 CONCLUSION ▸ Change in strategy: ▸ Gain initial result through multivariate analysis ▸ Refine through optimisations (catching hits in cones, better dE/dx shower selection, etc.) ▸ Time is pressing!
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