CORRECTION DUNE-PRISM MEETING FEBRUARY 28 TH , 2019 Cristvo Vilela - - PowerPoint PPT Presentation

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DATA-DRIVEN EFFICIENCY CORRECTION DUNE-PRISM MEETING FEBRUARY 28 TH , 2019 Cristvo Vilela INTRODUCTION Want to make a far detector prediction from near detector data, relying as little as possible on neutrino interaction model.

SLIDE 1

DATA-DRIVEN EFFICIENCY CORRECTION

DUNE-PRISM MEETING FEBRUARY 28TH, 2019

Cristóvão Vilela

SLIDE 2

INTRODUCTION

Want to make a far detector prediction from near

detector data, relying as little as possible on neutrino interaction model.

Near detector is much smaller than far detector and will

have limited efficiency for events with high hadronic energy.

Using MC to estimate near detector hadronic containment

efficiency introduces model dependence.

Try to calculate efficiency correction for selected events

at the near detector using the event geometry.

Ignoring lepton side of the event for now.

February 28 2019 DUNE-PRISM meeting 2

SLIDE 3

GEOMETRIC EFFICIENCY CORRECTION

Start out with a selected event at the near detector.
Non-primary-lepton energy deposits in the LAr shown.

February 28 2019 DUNE-PRISM meeting 3

SLIDE 4

GEOMETRIC EFFICIENCY CORRECTION

February 28 2019 DUNE-PRISM meeting 4

Randomly translate event within FV (blue) and rotate wrt average neutrino direction.
In this case, keeping x constant.
Not a good idea if we expect efficiency to change ~rapidly within a DUNE-PRISM OA slice and if

statistics are limited.

In future randomize x within OA slices and use all MC.

SLIDE 5

GEOMETRIC EFFICIENCY CORRECTION

February 28 2019 DUNE-PRISM meeting 5

Repeat N times.
N = 1000
A little slow, but doable.

SLIDE 6

GEOMETRIC EFFICIENCY CORRECTION

February 28 2019 DUNE-PRISM meeting 6

Efficiency for the event is:

𝑂𝑞𝑏𝑡𝑡 𝑑𝑝𝑜𝑢𝑏𝑗𝑜𝑛𝑓𝑜𝑢 𝑑𝑣𝑢

𝑢ℎ𝑠𝑝𝑥𝑡

𝑂𝑢ℎ𝑠𝑝𝑥𝑡

SLIDE 7

GEOMETRIC EFFICIENCY CORRECTION

February 28 2019 DUNE-PRISM meeting 7

Test method on on-axis near

detector events.

Works reasonably well.
Differences at high energy

probably from events that are never seen at the near detector.

For DUNE-PRISM prediction

will use far detector MC events to make up for those.

SLIDE 8

GEOMETRIC EFFICIENCY CORRECTION

February 28 2019 DUNE-PRISM meeting 8

Efficiency correction

seems a little worse at edges of detector.

Need to verify with

more MC.

Might need to tighten

FV.

Or improve method.

SLIDE 9

GEOMETRIC EFFICIENCY CORRECTION

February 28 2019 DUNE-PRISM meeting 9

Efficiency correction

seems a little worse at edges of detector.

Need to verify with

more MC.

Might need to tighten

FV.

Or improve method.

𝐹𝜉

𝑢𝑠𝑣𝑓 < 2 𝐻𝑓𝑊

SLIDE 10

WHAT NEXT

To figure out which far detector MC events need to be added to the

data-driven prediction, want to use the same method on far detector MC events:

Place far detector event randomly in imaginary near detector FV.
Throw translations and rotations to measure “near detector geometric efficiency”

for each far detector event.

Then, when building the prediction loop over, near detector data events

and far detector MC events:

If near detector geometric efficiency > threshold, use near detector data event
else use far detector MC event.
Need to flesh out details, but I think basic idea should work.
Found way of accessing true energy deposits in the far detector MC

files.

Currently writing an art module to calculate “near detector geometric

efficiency” for far detector events.

February 28 2019 DUNE-PRISM meeting 10