Reconstruction Chain Studies ORCA Osc. WG phone call, Bran - PowerPoint PPT Presentation

Reconstruction Chain Studies ORCA Osc. WG phone call, 
 Brían Ó Fearraigh, September 2019 � 1

• Discussion of two eLog posts: https://elog.km3net.de/ Computing+and+Software/353 and https:// elog.km3net.de/Computing+and+Software/346 � 2

Inclusion of L0 hits in JPrefit • JORCAPrefit, and JPrefit in the MC production scripts, includes L0 hits. • JPrefit -U option to use L0s. � 3

Inclusion of L0 hits in JPrefit • Inclusion of many more events results in a better efficiency, but poorer median angular deviation. 160 140 number of events [a.u] 120 100 with L0 hits 80 60 40 prefit simplex 20 gandalf 0 3 − 2 1 2 − − 10 10 10 1 10 10 angle (best fit muon) [deg] � 4

Inclusion of L0 hits in JPrefit • Inclusion of many more events results in a better efficiency, but poorer median angular deviation. 160 140 number of events [a.u] 120 100 no L0 hits 80 60 40 prefit simplex 20 gandalf 0 3 − 2 1 2 − − 10 10 10 1 10 10 angle (best fit muon) [deg] � 5

Inclusion of L0 hits in JPrefit • Slightly better median angular resolution Median angular resolution [degrees] 70 JPrefit(no L0s) JGandalf → JPrefit(with L0s) JGandalf → 60 50 40 30 20 10 1 2 3 4 5 6 7 8 9 10 E neutrino [GeV] true � 6

Inclusion of L0 hits in JPrefit • Showing quantiles for both cases.. JPrefit JGandalf (with L0s) → Median angular resolution [degrees] 90 33% quantile 50% quantile 68% quantile 80 70 60 50 40 30 20 10 0 1 2 3 4 5 6 7 8 9 10 E neutrino [GeV] true � 7

Inclusion of L0 hits in JPrefit • Showing quantiles for both cases.. JPrefit JGandalf (no L0s) → Median angular resolution [degrees] 90 33% quantile 50% quantile 68% quantile 80 70 60 50 40 30 20 10 0 1 2 3 4 5 6 7 8 9 10 E neutrino [GeV] true � 8

Inclusion of L0 hits in JPrefit • include as many events as possible and can make cuts at analysis level. E.g. a selection criteria can always bring back to the L1 hit only case. • Suggestion from Maarten de Jong to include L0s or not dependent on which trigger was used. � 9

JGandalf Update • As shown previously, running JGandalf after JStart (using the track length for the hit selection) can give an improvement in the angular deviation/median angular resolution � 10

JGandalf Update • Angular deviation (from best fit true muon track) · • Median space angle: 13.384° (infinite track) vs. 10.374° (using track length) 140 # events JPrefit->JGandalf->JStart->JGandalf (infinite track length, all fits) 120 JPrefit->JGandalf->JStart->JGandalf (finite track length, all fits) 100 80 60 40 20 0 1 2 − 10 1 10 10 angular deviation (degrees) � 11

JGandalf Update • Angular resolution improvement.. Median angular resolution [degrees] 60 JPrefit JGandalf JStart JGandalf (infinite track) → → → JPrefit JGandalf JStart JGandalf (finite track) → → → 50 40 30 20 10 1 2 3 4 5 6 7 8 9 10 E neutrino [GeV] true � 12

JGandalf Update • JGandalf has been updated such that if the object W(START_LENGTH_METRES) exists, it will be used for the hit selection. • The option JGandalf -z “x x” exists to extend the range around the track length by a specified amount. The default is still to take an infinite track when ran after JPrefit . � 13

Extras � 14

JGandalf Update • Keep in mind these checks have been for one file, 
 mcv5.0.gsg_muon-CC_1-10GeV.km3sim.jte.100.root � 15

JGandalf Update • Also check on extending the track length upstream and downstream (symmetrically in both directions). TRACK LENGTH EXTENSION (M) MEDIAN ANGULAR DEVIATION (DEGREES) Infinite track length 13.384 0 (track length) 10.374 2 9.686 4 9.363 5 9.304 6 9.235 7 9.463 10 9.647 20 9.669 50 10.398 100 12.038 � 16

JGandalf Update • Also check on extending the track length upstream and downstream (asymmetrically in both directions). TRACK LENGTH EXTENSION (M) 
 MEDIAN ANGULAR DEVIATION (DEGREES) (DOWNSTREAM, UPSTREAM) -1 ,6 9.163 -5 , 9 9.304 -4 , 8 9.165 -3 , 30 9.321 -3, 25 9.278 1-3 metres downstream appears to give an improvement, whereas no point extending too much upstream ~ vague but not too important ~ � 17