# Presentation: 115245

## NC Working Group Summary

- Summary of recent work
- Tasks and goals

## Late Activity

- Low Pulseheight Events
- Instrumentation effects particularly important for NC
- Niki identified prominence of edge pixels in low pulseheight excess in NearDet data – PMT effect
- 100ns cut on event duration removes this excess
- Unknowns:
- Is this really PMT effect?
- Exactly how do these events pass reco?
- How are otherwise good events effected by whatever
-     mechanism causes low PH excess?
- What other effects are there?

## LI In SGATE

- Rustem, Bill Luebke, et al.
- Use Light Injection to separate PMT from other effects
- Afterpulsing lifetime and pixel pattern agree well with afterglow seen in beam data, and effect in low pulseheight event excess

## Raw Beam Data

- P.S. – break beam data into 4 “epochs” in SGATE
- Pre-beam, beam, up to 1.6s after beam, and more than 1.7 s after beam
- 1st post-beam epoch shows same pixel pattern as PMT afterpulsing seen in LI
- However, later timescales show late activity
-     with higher pulseheights, and no pixel pattern
-     – neutrons?  Muon decay?

## Muon Lifetime

- Tom Osiecki
- Is Muon Decay a significant part of late activity?
- Measurement is test of NearDet performance
-   lifetime appears to show reduction due to Fe capture
-   has background not yet understood.  Charge mis-ID?
- Not a significant source of Late Activity

## Cuts

- Duration cut removes much of low pulseheight event excess
- So does previous activity cut
- Need to understand
- How does previous activity affect otherwise good events?
- What (rate dependent) bias is introduced by any such cut?
- Model in MC

## Data/MC

- Niki – ANN selection, ND Data/MC
- Remarkably good comparison for all 3 beam configurations at this stage.
- Preliminary calibrations
- Phill – 1st look at FarDet Data/MC
- “Nothing Crazy” in the data
- Low Level noise at FD – Justin Evans
- Low-level study of noise in FD Spill triggers.
- At raw level, noise is overwhelming below ~0.5 GeV, but reconstruction and topological selections will improve this
- Useful input to MC simulation or MC overlay studies.

## Fitting

- Marquardt – Brian
- Input gradients of data with respect to systematic parameters into fit function
- Feldman-Cousins – Tobi
- (Very) Preliminary tests with MDC:
- m2 vs. fS
- Alysia – Combined NC/CC
- SNO like fit, to Likelihood decomposition of NC and CC, without a selection cut

## Tasks

- Plans for/before Ely
- Low energy blobs / blobs /instrumentation effects
-  Low energy blobs in low intensity
-  LI in s-gate - afterpulsing
- FD - Trigger threshold
-  ND Shower reconstruction issues / energy resolution
-  MC comparison
-  FD / ND calibration impact on the NC analysis
- 5-year plan - how sensitive will we be?
- When will we "recommend to open the box"? (sensitivity vs pots)
- FD / ND calibration impact on the NC analysis
- More elaborate dm2-fs-ft fitting (too early?)

- ToDo list from May 13, 2005
-   Much progress   Some Progress     Groundwork

## Updated Task list

- Low energy blobs / blobs /instrumentation effects
- - Make cut variables available in Ntuples
-  Low energy blobs in low intensity
-  LI in s-gate - afterpulsing
- FD - Trigger threshold
-  ND Shower reconstruction issues / energy resolution
-  MC comparison
-  Interface with Batch Processing
-  Common Analysis Framework
-  FD / ND calibration impact on the NC analysis
- 5-year plan - how sensitive will we be?
- When will we "recommend to open the box"? (sensitivity vs pots)
- FD / ND calibration impact on the NC analysis
- More elaborate dm2-fs-ft fitting (too early?)
- Blessed plots

## a