LAr+MPD acceptance vs. E -q0-q3 Chris Marshall Lawrence Berkeley - - PowerPoint PPT Presentation

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LAr+MPD acceptance vs. E -q0-q3 Chris Marshall Lawrence Berkeley - - PowerPoint PPT Presentation

Nov 09, 2022 151 likes •374 views

LAr+MPD acceptance vs. E -q0-q3 Chris Marshall Lawrence Berkeley National Laboratory 10 July, 2019 Reminder: LAr acceptance LAr detector will have very high event rate, and does not necessarily need high acceptance However, it would

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LAr+MPD acceptance

  • vs. Eν-q0-q3

Chris Marshall Lawrence Berkeley National Laboratory 10 July, 2019

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Chris Marshall 2

Reminder: LAr acceptance

  • LAr detector will have very high event rate, and does

not necessarily need high acceptance

  • However, it would be very bad if a particular region of

phase space had zero acceptance, because then we would have no constraint on that phase space

  • Important question is not what is the acceptance, but

what fraction of events have non-zero acceptance

  • We also want acceptance to be slowly varying vs.

kinematics so that it is not sensitive to detector modeling

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Chris Marshall 3

Detector as seen by ν beam (XY projection)

F.V. Active volume

7m 3m

hadron tracks

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Chris Marshall 4

Same event, translated

F.V. Active volume

7m 3m

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Chris Marshall 5

Event that is not contained with any translation

F.V. Active volume

7m 3m

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Chris Marshall 6

But is using phi symmetry

F.V. Active volume

7m 3m

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Chris Marshall 7

Plot from previous study

  • Shows that cross

section coverage is high, and slowly varying vs. neutrino energy for detectors that are >450cm long

  • Implies that there are

no acceptance holes in the flux peak, because >99% of cross section has non-zero acceptance

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Chris Marshall 8

Acceptance vs. q0-q3

  • Reviewer of the ND CDR-lite document suggested that

what we should show is acceptance vs. q0-q3 in slices

  • f neutrino energy
  • q0 = energy transfer to nucleus
  • q3 = 3-momentum transfer to nucleus
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Chris Marshall 9

q0-q3 distributions

  • True q0-q3 distributions in GENIE for two slices of neutrino energy
  • Two populations at low momentum transfer are CCQE and Δ resonance
  • q0=q3 is Q2→0 kinematic limit
  • Lower-right corner is high muon angle

1 < Eν < 2 GeV 3.5 < Eν < 4 GeV

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Chris Marshall 10

Acceptance: 0 < Eν < 1 GeV

  • Caveat: this is actually selected CC νμ events, so there is an

additional requirement that isn't related to acceptance: the muon must be long enough to identify as a muon and not a pion

  • Upper-right corner efficiency is low because muon is very soft
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Chris Marshall 11

Acceptance: 1 < Eν < 2 GeV

  • Black regions on the right plot (log scale) are basically <1%

acceptance

  • These are effectively “acceptance holes”, but we can't say if

it's 1% or 0 with this level of MC statistics

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Chris Marshall 12

Acceptance: 2 < Eν < 2.5 GeV

  • Basically > few% acceptance everywhere, and very

high acceptance at low momentum transfer

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Chris Marshall 13

Acceptance: 2.5 < Eν < 3 GeV

  • Basically > few% acceptance everywhere, and very

high acceptance at low momentum transfer

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Chris Marshall 14

Acceptance: 3 < Eν < 3.5 GeV

  • Basically > few% acceptance everywhere, and very

high acceptance at low momentum transfer

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Chris Marshall 15

Acceptance: 3.5 < Eν < 4 GeV

  • Basically > few% acceptance everywhere, and very

high acceptance at low momentum transfer

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Chris Marshall 16

Acceptance: 4 < Eν < 5 GeV

  • Basically > few% acceptance everywhere, and very

high acceptance at low momentum transfer

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Chris Marshall 17

Acceptance: 5 < Eν < 6 GeV

  • Basically > few% acceptance everywhere, and very high

acceptance at low momentum transfer

  • Small hole at high muon angle, but very, very few events
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Chris Marshall 18

Acceptance: 6 < Eν < 8 GeV

  • Basically > few% acceptance everywhere, and very high

acceptance at low momentum transfer

  • Small hole at high muon angle, but very, very few events
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Chris Marshall 19

Acceptance: 8 < Eν < 10 GeV

  • Basically > few% acceptance everywhere, and very high

acceptance at low momentum transfer

  • Small hole at high muon angle, but very, very few events
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Chris Marshall 20

Fraction of events in Eν-q0-q3 regions with acceptance

  • >99% have non-zero

acceptance out to 10 GeV

  • >98% have >2%

acceptance out to 5 GeV

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Chris Marshall 21

Acceptance is high in peak region

  • Acceptance is >30% for most q0-q3 regions in the flux

peak, and >50% for a lot of the space

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Chris Marshall 22

Conclusions

  • 7x3x5m detector has no significant acceptance holes,

including muon + hadron containment

  • Acceptance vs. q0-q3 is high in region where most

events are, and has a region of low acceptance at high Q2 and higher neutrino energy

  • Most of the cross section is in phase space with high

acceptance