1. Andy Blake Cambridge University Thursday April 12 th 2007 Towards a Combined Atmospheric Analysis

2. Towards a Combined Analysis Andy Blake, Cambridge UniversityCombined Analysis, slide 2 Developing a combined atmospheric neutrino analysis: – Contained vertex muon neutrinos (John Chapman). – Upward-going muons (Brian Rebel, John Chapman). – Contained vertex electron neutrinos (Ben Speakman). Currently collating all the event selection code: – All track and shower selection variables now calculated in AtNuOutput classes and stored in AtNuEvent classes. – Event selection implemented in AtNuAna package. – Analysis variables written to short AtNuAna Ntuples. Propagating improved algorithms through reconstruction. e.g. Determination of direction from timing.

3. Event Selection Andy Blake, Cambridge UniversityCombined Analysis, slide 3 DATA / MC DATA QUALITY CHECKS GOOD TRACKSGOOD SHOWERS GOOD EVENTS UPWARD-GOING MUONS CONTAINED VERTEX ELECTRON NEUTRINOS Outline of event selection: John and Brian’s track selection Ben’s shower selection Data: HV, coil, GPS, LI, bad chips etc. MC: large scatters. LI rejection, clean planes, “fiducial” event

4. Event Types Andy Blake, Cambridge UniversityCombined Analysis, slide 4 typedef enum EEventType { kNothing = 0x00, kGoodSlice = 0x01, kGoodEvent = 0x02, kGoodTrack = 0x04, kGoodShower = 0x08, kCV = 0x10, kCE = 0x20, kUP = 0x40, kFC = 0x80, kPC = 0x100, kPCDN = 0x200, kPCUP = 0x400, kUPMU = 0x800, kCosmic = 0x1000, kStoppingMuon = 0x2000, kThroughGoingMuon = 0x4000, kMultipleMuon = 0x8000, kVeto = 0x10000, kSpill = 0x20000, kBeamSpill = 0x40000, kFakeSpill = 0x80000, kGoodDirection = 0x100000, kGoodCharge = 0x200000, kPositiveCharge = 0x400000, kNegativeCharge = 0x800000, kAtmosNumu = 0x1000000, kAtmosNumuCV = 0x2000000, kAtmosNumuUP = 0x4000000, kAtmosNue = 0x8000000, kLIevent = 0x10000000, kMCscatter = 0x20000000 } EventType_t; typedef enum EAtmosEventType { kNothing = 0x00, kGoodEvent = 0x01, kSpill = 0x02, kBeamSpill = 0x04, kVeto = 0x08, kCV = 0x10, kUP = 0x20, kGoodTrack = 0x40, kGoodShower = 0x80, kAtmosNumu = 0x100, kAtmosNumuCV = 0x200, kAtmosNumuUP = 0x400, kAtmosNue = 0x800, kAtmosNumuCVcut1 = 0x1000, kAtmosNumuCVcut2 = 0x2000, kAtmosNumuCVcut3 = 0x4000, kAtmosNumuCVcut4 = 0x8000, kAtmosNumuUPcut1 = 0x10000, kAtmosNumuUPcut2 = 0x20000, kAtmosNumuUPcut3 = 0x40000, kAtmosNumuUPcut4 = 0x80000, kAtmosNueCVcut1 = 0x100000, kAtmosNueCVcut2 = 0x200000, kAtmosNueCVcut3 = 0x400000, kAtmosNueCVcut4 = 0x800000 } AtmosEventType_t; Event Types containment cosmics veto shield, beam spills good direction, good charge light injection MC scatter Atmos Neu Event Types containment cuts upward going cuts electron neutrino cuts Above event types defined by methods in AtNuAna class.

5. Current Progress Andy Blake, Cambridge UniversityCombined Analysis, slide 5 STEP 1 : implement selection and test using ~1 day sample. (lots of cutting and pasting of selection code…) STEP 2 : optimize selection using ~6 months data and MC. (hopefully shouldn’t need much optimizing…) (DONE) (PROCESSING)

6. Event Selection: (I) Contained Events Andy Blake, Cambridge UniversityCombined Analysis, slide 6 Trace Cut: atmos cosmic data

7. Event Selection: (I) Contained Events Andy Blake, Cambridge UniversityCombined Analysis, slide 7 Topology Cuts: atmos cosmic data

8. Event Selection: (II) Upward Muons Andy Blake, Cambridge UniversityCombined Analysis, slide 8 RMS Timing cut: atmos cosmic data

9. Event Selection: (II) Upward Muons Andy Blake, Cambridge UniversityCombined Analysis, slide 9 Time Slope cut: atmos cosmic data

10. Event Selection: (III) Electron Neutrinos Andy Blake, Cambridge UniversityCombined Analysis, slide 10 Shower Trace cut: atmos cosmic data

11. Event Selection: (III) Electron Neutrinos Combined Analysis, slide 11 Moment of Inertia cut: atmos cosmic data Andy Blake, Cambridge University

12. Event Selection: (IV) Event Rates Andy Blake, Cambridge UniversityCombined Analysis, slide 12 Events / kT-Yr (atmos run 179) CurrentCombined Contained  CC 27.826.6 Contained e CC 13.613.0 Pretty good agreement – so no obvious mistakes! Event rates slightly lower at the moment though. Haven’t processed any upward muons yet.

13. Summary Combined Analysis, slide 13 Making lots of progress, given fraction of time spent on analysis. – Much selection code now in place. – Selection seems broadly okay so far. – But need to look at a much larger sample. Unlikely to have full combined analysis ready for summer though. – Selection and some analysis (e.g. charge ratio) should be ready. – Will try to be done by September! Andy Blake, Cambridge University