Towards a Combined Atmospheric Analysis

1
Towards a Combined Atmospheric Analysis
Andy Blake Cambridge University Tuesday January
30th 2007
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Overview

• Slide shown at December collaboration meeting

Next 6 months develop a combined atmospheric
analysis. - Initial plans in place but much
work still to be done. Would like to aim for
- Preliminary results by Athens (April 2007).
- Conference results and draft publication by
Ely (June 2007).

• Manpower available to work on combined
  atmospheric analysis
• - Andy (part time), Brian (part time),
  others(?).
• It will be difficult to achieve our goal without
  any full time support.
• - Part time analyses tend to incur delays!
• Analysis only possible because there is little
  new work involved.

Andy Blake, Cambridge University
Combined Analysis, slide 2
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(I) Proposed Goals for Athens

• (II) Combined Selection.
• Default plan for selection
• - Standardize the pre-selection.
• - Use Johns selection for contained
• events and short up-going muons.
• - Use Brians selection for standard
• up-going muons.
• - Use Bens electron neutrino selection.
• Use new short atmospheric ntuples
• (contain all the atmospheric variables,
• documentation exists, easy to use).

Andy?
Brian?

• (I) Combined Monte Carlo.
• Would like to have a unified upward muon
• contained vertex MC (using BARR flux and
• NEUGEN cross-section models since we
• have in-house expertise for these models).
• Proposed solution develop a re-weighting
• scheme that can convert the current upward
• muon MC to use these models.
• Develop analysis using old MC and insert
• re-weighted MC when ready.

Andy Blake, Cambridge University
Combined Analysis, slide 3
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(II) Proposed Goals for Ely

• (I) Physics Analyses.
• Combined charge ratio.
• Numu-Nue double-ratio.
• Combined oscillation fit.
• Default plan
• - Contained events binned in L/E
• and divided up by resolution
• (as before).
• - Upward muons binned in cos?
• and divided up by momentum
• (as before).
• - Electron neutrinos used to

• (II) Analysis Cross-checks.
• Charge identification.
• Veto shield efficiencies.
• Determine backgrounds.
• Others ?

Somebody?
Anybody?
(III) Draft Publication?
Everybody!
Andy Blake, Cambridge University
Combined Analysis, slide 4