Muon acceptance for LAr+KLOE+STT and LAr+dipole+HPGPTC Chris - - PowerPoint PPT Presentation

Muon acceptance for LAr+KLOE+STT and LAr+dipole+HPGPTC

Chris Marshall, LBNL Justo Martin-Albo, Jose Palomino, Mike Kordosky 21 February, 2018

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Recall: last week

• Geometry is ArgonCube + KLOE + STT or ArgonCube

+ dipole + HPGTPC, created with duneggd by Jose Palomino

• GENIE events in ArgonCube simulated with Geant4

using edep-sim, files produced by Justo Martin-Albo

• Analysis of muon acceptance for events in ArgonCube

fiducial volume

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Caveat: old ArgonCube geometry

Ar active volume 4x2x5m (optimized is 4x3x5m) Downstream of LAr is 60cm polycarbonate (ρ=1.2) and 40cm steel (ρ=8) total 394 g/cm3, updated design is ~20

25t FV has 50cm buffer around edges, and 1.5m downstream

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Updated geometry

• Geometry updated by Jose Palomino
• Steel removed
• Polycarbonate density changed to that of foam
• Downstream material now essentially negligible for

muon stopping, as is expected with design like the one proposed by Alan Bross

• Active height increased to 3m
• Bug fix in magnetic field

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ArgonCube + HPGTPC in dipole

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KLOE magnet + ArCube side view

ArgonCube STT

ν

sky South Dakota

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Muon fate

• Stops in LAr
• Exits sides (left/right)
• Exits top/bottom
• Stops in downstream LAr passive material
• Stops in magnet passive material
• Enters magnetized tracker (STT/HPGTPC)
• Other (exits LAr downstream but misses tracker)

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Muon stopping point (side view) KLOE+STT

• Not shown
• Active LAr contained
• Side-exiting
• STT-matched
• Most muons stop in

KLOE magnet

• Remaining caveat:

muons stopping in KLOE calorimeter are not considered separately, but should be

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Muon stopping point (side view) dipole+HPGTPC

• Not shown
• Active LAr

contained

• Side-exiting
• TPC-matched
• Most muons that exit

the LAr downstream end stop in dipole magnet

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Neutrino energy and elasticity

• Will show

acceptance for various scenarios in this space

• νμ CC only
• X axis is neutrino

energy

• Y axis is Eμ/Eν,

fraction of energy going to the muon

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Muon kinematics

• New this week:

also have plots in terms of muon kinematics

• Kinetic energy

and angle

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Acceptance

• νμ CC events originating in 3x2x3m LAr F.V. with

50cm around edges and upstream, and 1.5m downstream

• Rate is sufficiently high that statistics will be plentiful

even with relatively low (few percent) acceptance

• But acceptance differences between ND and FD will be

corrected with a model

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LAr hadronic containment

• Improved from last

week due to active height increase to 3m

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LAr-contained muon

• Bottom-left corner

is lower muon energy

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LAr-contained muon

• As expected, only

low-energy muons are contained

• Cutoff is about 1

GeV ~ 5m at 2 MeV/cm

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Tracker-matched track

• Issue from last week has been fixed – tracker

acceptance at high energy is higher for Dipole/TPC

• Acceptance in tracker changes

KLOE+STT Dipole+HPGTPC

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Tracker-matched track

• As expected, tracker is high-energy, forward muons
• Minimum kinetic energy ~1.5 GeV for KLOE and ~1

GeV for dipole

KLOE+STT Dipole+HPGTPC

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Contained OR tracker

• Acceptance gap around focusing peak in both cases,

smaller for dipole case

KLOE+STT Dipole+HPGTPC

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Contained OR tracker

• Acceptance dip for ~1 GeV, forward muons, which are

too energetic to stop in LAr but not energetic enough to penetrate KLOE

KLOE+STT Dipole+HPGTPC

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Contained OR tracker OR sides

• Adding side detectors fills in gap somewhat
• Still changing acceptance near peak

KLOE+STT Dipole+HPGTPC

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Contained OR tracker OR sides

• Adding side detectors fills in gap somewhat
• Still changing acceptance around 1 GeV

KLOE+STT Dipole+HPGTPC

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Contained OR tracker OR sides OR bottom

• Top/bottom detectors are more difficult than sides and

are considered separately

• Includes top, but most muons exit bottom due to beam

angle

KLOE+STT Dipole+HPGTPC

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Contained OR tracker OR sides OR bottom

• Acceptance still changes rapidly as a function of muon

energy around 1 GeV for very forward events

KLOE+STT Dipole+HPGTPC

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Magnet stoppers

• Acceptance still changes rapidly as a function of muon

energy around 1 GeV for very forward events

KLOE+STT Dipole+HPGTPC

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Magnet stoppers

• Higher-energy events in KLOE plot could be recovered

with KLOE ECAL

KLOE+STT Dipole+HPGTPC

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KLOE muon endpoints

• Muons > 1.5 GeV frequently go into the ECAL, but

muons < 1.5 GeV stop in the yoke Tμ < 1.5 GeV Tμ > 1.5 GeV

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1D acceptance by muon fate

• Acceptance by detector where muon stops
• Magnet is magenta, peaks at 35% of all CC events in KLOE, right near oscillation maximum
• Dipole peaks lower and at ~18% of CC events

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1D acceptance by muon fate

• KLOE stops ~50% for muons at 1-2 GeV
• 1.5-2 GeV many stop in the ECAL, but 1-1.5 GeV are stopping in magnet
• Dipole still has some shape in acceptance around 1 GeV but much better

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Conclusions

• Muons will stop in heavy stuff

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Plot dumps

• zip file contains many additional plots for both

detectors

• Efficiencies in 2D for each muon stopping volume