DUNE-PRISM:“Current” Events

Collaboration Meeting Talk

Flux Fitting Recap

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Flux Fitting Recap

Flux Fitting RecapRegularization penalty is tuned to optimize quality of fit (“residual norm”) and smoothness of coefficients (“solution norm”).

Flux Fitting Recap

The ProblemEven with a 40m long hall, we can’t fit certain features:

Horn Currents and Fitting Power

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Fitting With Horn Currents

What’s new:

● Coefficient vector has a new row for each additional horn current flux● ND flux matrix has a new row for each of those fluxes● Penalty matrix (𝚪) is block-diagonal

○ Off-Axis and Horn Current fluxes can be penalized independently○ Here, we penalize the overall normalization of those coefficients (suppressing those fluxes)

Fits with Alternative Horn CurrentsBoth lower (250 kA) and higher (303 kA) provide a much better fit than only off-axis.

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Fits with Alternative Horn CurrentsHC variation doesn’t add much when features are at low energies.

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How Low Can We Go?Ideally, we want to change the current as little as possible, and decrease rather than increase:

How Low Can We Go?Ideally, we want to change the current as little as possible, and decrease rather than increase:

How Low Can We Go?Ideally, we want to change the current as little as possible, and decrease rather than increase:

280 kA / 300 kA

Off-axis Plus 280 kA On-axis Works! Include on-axis only in this plot

Systematic CancellationsRemember that the point is for systematics to cancel. We need to be sure that a shift in some parameter will move the FD flux and ND combination in the same way.

Target is 2% relative variation between FD and ND.

Beam Systematics

These are faked. HC systs are just copies of ND on-axis systs. Making real ones now…

Coarser binning > 5 GeV

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Beam SystematicsSummary plots: Bottom plot from before, showing median and 68% containment intervals

Hadron Production Systematics Coarser binning > 5GeV

Hadron Production Systematics

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Beam Systematic Cancellation Plots

Hadron Production Systematic Cancellation Plots