MINERvA MC modification

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MINERvA MC modification
Look at event before nuclear rescattering If a
single pion Record pion and nucleon
charges Record pion and nucleon kinematics
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CC
Single Pion spectra before nuclear interactions
Single pi spectra after nucint from above
Single pi spectra after nucint not from above
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NC
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Final pi momentum vs initial pi momentum
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Just inner detector
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Pi0
Pi0 pi pi-
Initial single pi
Full detector CC
Surviving singlepi
New single pi
Full detector NC
Inner detector
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Q2 1 GeV2
Backward electroproduction of pi0
Nucl-ex/0309009
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A radical but perhaps clean cut
Select backward tracks and pi0's Gives high p to
forward nucleon Should be able to understand
angluar distributions in piN CM.
Lower E pi's more subject to rescattering Some
backward pi's are rescattered forward pi's.
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Backward Pions
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Pi0 pi pi-
Initial
Backward angle CC
Backward angle NC
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Efficiency analysis - in progress Assume muon
identified Select events with 1, 2, or 3 hadron
'tracks' pi counts as one track from
truth. Forget truth. Identify tracks with gap
between vertex and closest raw hit. Identify gap
tracks as neutrons or pi0 Identify pi vs N by
angle and energy Look for pi's that stop and
decay to help