Andy Blake Cambridge University Wednesday June 13 th 2007

Andy BlakeCambridge University

Wednesday June 13th 2007

Combined Atmospheric Analysis:Study of 6 Month’s Data.

Overview

Andy Blake, Cambridge University Combined 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 developing 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.

• Have now completed study using six month data sample.

Event Selection


DATA / MC

DATA QUALITY CHECKS

GOOD TRACKS GOOD SHOWERS

GOOD EVENTS

UPWARD-GOINGMUONS

CONTAINEDVERTEX

ELECTRONNEUTRINOS

Outline ofevent selection:

John and Brian’strack selection

Ben’sshower selection

Data: HV, coil, GPS, LI, bad chips etc. MC: large scatters.

LI rejection,clean planes,

“fiducial” event

Event Types


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;

Eve

nt

Typ

es

containment

cosmics

veto shield,beam spills

good direction,good charge

light injectionMC scatter

Atm

osp

her

ic N

eutr

ino

Eve

nt

Typ

es

containment cuts

upward goingcuts

electron neutrinocuts

Above event types defined by methods in AtNuAna class.

6 Month Study


• Data. – runs 31812/0-33480/6. (Jun 1st 2005 - Dec 31st 2005). – 206 days live time.

• Atmospheric Neutrino MC. – runs 233-242 (Cambridge). – 10x 178.3 kT-Yrs.

• Upward Muon MC. – runs 900-999 (Brian). – 100x 2 yrs .

• Cosmic Muon MC. – runs 651-750 (Cambridge). – 100x 17 hrs (70 days) .

Data Quality Checks


Good Data

Bad Data

Data Quality Checks


BAD HV

BAD COIL

Integrated Live Time

100% line

Data/MC Checks


Stopping Muons: Reconstructed Zenith Angle

Data/MC Checks


Stopping Muons: RMS of Down-Going Timing Fit

Timing fitting codeunder further study

Data/MC Checks


Stopping Muons: Track Fit Relative Error

Reconstruction Checks


Selected Contained Atmospheric Muon Neutrinos:Reconstructed Muon Momentum From Range.



Selected Contained Atmospheric Muon Neutrinos:Reconstructed Muon Momentum From Curvature.



Selected Contained Atmospheric Muon Neutrinos:Reconstructed Hadronic Shower Energy.

Contained Event Selection


• Good Event Selection

– Data Quality Cuts.

• Good Track Selection.

– Track Planes. – Track Like Planes. – Track Pulse Height Fraction. – “Fiducial” Track.

• Containment Cuts.

– Contained Vertex. – Trace Cut. – Topology Cuts (I). – Topology Cuts (II). – Veto Shield Cut.

John C’s Selection Cuts

Trace Cut


Contained Event Selection: Trace cut

Topology Cuts (I)


Contained Event Selection: Mean/RMS position of strips around vertex

Topology Cuts (I)


Contained Event Selection: Maximum plane charge, Strip displacement at vertex

Topology Cuts (II)


Contained Event Selection: Vertex Charge vs Track Direction

Region removed by selection cut

Veto Shield Cut


Time of Closest Veto Shield Hit (Cut at ±50 ns)

Results


Data cosmic Background

atmos (no oscillations)

upward (no oscillations)

Contained 33,540 30,410 ± 3,040 94 ± 14 2 ± 0

Trace 2,330 2,090 ± 210 88 ± 13 1 ± 0

Topology (I) 712 510 ± 50 83 ± 12 1 ± 0

Topology (II) 301 175 ± 20 81 ± 12 1 ± 0

Veto Shield 84 6 ± 1 79 ± 12 1 ± 0

expectation = 86 ± 12 events(no oscillations)

Contained Event Selection

Up-Going Event Selection


• Good Event Selection.


• Good Track Selection.

– Track Planes. – Track Like Planes. – Track Pulse Height Fraction. – “Fiducial” Track.

• Up Going Cuts.

– Topology Cuts. – Timing Cuts (I). – Timing Cuts (II).

John C’sSelection Cuts

Timing Cuts (I)


Upward Event Selection: RMS timing deviations (up going, down going timing fits)

Timing Cuts (I)


Upward Event Selection: RMS(up) / Range cut

Timing Cuts (I)


Upward Event Selection: time slope cut

Timing Cuts (II)


Upward Event Selection: RMS(up)-RMS(down)

Results





Topology 790 400 ± 50 43 ± 6 52 ± 8

Timing (I) 69 0 31 ± 5 44 ± 7

Timing (II) 55 0 26 ± 4 43 ± 6


Upward Event Selection

Electron Neutrino Selection


• Good Event Selection.


• Good Shower Selection.

– Clean Planes. – Shower Planes. – Shower Pulse Height Fraction. – “Fiducial” Shower.

• Up Going Cuts.

– Contained Vertex. – Shower Trace. – Mean/RMS strips/charge per plane. – Moment of Inertia Tensor.

Ben’sSelection Cuts

Shower Trace Cut


Electron Neutrino Selection: Shower Trace.

SHORT SHOWERS LONG SHOWERS

Topology Cuts


Electron Neutrino Selection: RMS Strips Per Plane.


MOI Cuts


Electron Neutrino Selection: Moment of Inertia Tensor.


Veto Shield Cut


Time of Closest Veto Shield Hit (Cut at ±50 ns)

Results





Contained 4250 2790 ± 280 55 ± 8 0 ± 0

Trace 1860 1100 ± 111 51 ± 8 0 ± 0

Topology 352 157 ± 17 42 ± 6 0 ± 0

MOI 187 61 ± 7 37 ± 6 0 ± 0

Veto Shield 37 4 ± 1 36 ± 5 0 ± 0



Summary





FC 69 5.2 ± 0.5 72.4 ± 10.9 1.7 ± 0.3

PCDN 17 0.8 ± 0.1 9.3 ± 1.4 0.1 ± 0.0

PCUP 2 0 10.2 ± 1.5 1.3 ± 0.2

UPMU 34 0 1.7 ± 0.2 40.1 ± 6.2

Muon Neutrino Selection




NUE 37 4.4 ± 0.4 36.0 ± 5.4 0 ± 0


Selected FC/PC Events


Selected FC/PC Events: Vertex Distance from Edge of Detector



Selected FC/PC Events: Reconstructed Neutrino Energy



Selected FC/PC Events: Reconstructed L/E

Vetoed FC/PC Events


Vetoed FC/PC Events: Vertex Distance from Edge of Detector

Vetoed FC/PC Events


Vetoed FC/PC Events: Reconstructed Zenith Angle (from top of track)

Vetoed FC/PC Events


Vetoed FC/PC Events: Track Planes.

Selected UPMU Events


Selected UPMU Events: Reconstructed Muon Momentum

Selected UPMU Events


Selected UPMU Events: Reconstructed Zenith Angle

Need to add thehorizontal events

Selected NUE Events


Selected NUE Events: Vertex Distance from Edge of Detctor

Selected NUE Events


Selected NUE Events: Shower Planes

Selected NUE Events


Selected NUE Events: Reconstructed Shower Energy.

Reconstructed usinghadronic energy scale,

So needs re-tuning

Vetoed NUE Events


Vetoed NUE Events: Vertex Distance from Edge of Detector

Vetoed NUE Events


Vetoed NUE Events: Reconstructed Shower Energy

Large disagreementbetween data and MC

Summary


• Much of Analysis Implemented. – Data Quality Checks. – Data/MC Comparisons. – MC Checks. – Event Selection.

• Some disagreements. – Timing Simulation.

– Shower Energy Reconstruction. – Electron Neutrino Background.

• Future Work. – Timing Calibration for Latest Data. – Study Veto Shield. – Bayesian L/E Resolution.

Documents

Andy Blake Cambridge University Wednesday June 13 th 2007