MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar,...

61
Jeff Hartnell University of Sussex RAL Seminar, July 22 nd 2009 MINOS: Latest Results and Future Plans

Transcript of MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar,...

Page 1: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

JeffHartnellUniversityofSussex

RALSeminar,July22nd2009

MINOS:LatestResultsandFuturePlans

Page 2: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

IntroducFon•  MINOSphysicsgoals•  NuMIneutrinobeam&MINOSdetectors

•  Results:– PrecisemeasurementofΔm2

– MuonanF‐neutrinos– Searchforelectronneutrinoappearance– Searchforsterileneutrinos

•  MINOSfutureplans

•  AfewslidesonSNO+

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TheMINOSCollaboraFon

Argonne • Athens • Benedictine • Brookhaven • Caltech • Cambridge • Campinas • Fermilab Harvard • Holy Cross • IIT • Indiana • Minnesota-Twin Cities • Minnesota-Duluth • Otterbein

Oxford • Pittsburgh • Rutherford • Sao Paulo • South Carolina • Stanford • Sussex • Texas A&M Texas-Austin • Tufts • UCL • Warsaw • William & Mary

140 scientists 28 institutions

Page 4: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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MINOSOverview

735 km

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NeutrinoMassesandMixings

Δmatm2

Δmsol2

Page 6: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

MINOSPhysicsGoals•  Precisemeasurementsof|Δm2

atm|andsin2(2θ23)viaνμ disappearance

•  Searchforsub‐dominantνμ‐>νeoscillaFonsviaνeappearance

•  Searchforsterileν•  CPT/LorentzviolaFon•  Atmosphericneutrinoandcosmicrayphysics•  StudyνinteracFonsandcrosssecFonsinNearDetector

•  SearchforbothνμdisappearanceANDappearance•  testthestandardneutrinomodel

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νμDisappearance

•  Doνμandνμoscillateinthesameway?

•  Ifnot,thencouldbeevidenceforCPTviolaFonornon‐standardinteracFons

Δmatm2

Δmsol2

ν 1

ν 2€

Δm atm2

Δm sol2

ν 3€

P(ν µ →ντ ) = sin2(2θ)sin2 1.27Δm2L

E

P(ν µ →ντ ) = sin2(2θ)sin2 1.27Δm2L

E

= ? Does

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νμAppearance•  MINOShasobservedthedisappearanceof100sofνμ

–  Doanyofthesereappearasνμ?–  ConsideranexperimentallydrivenparametrisaFon:

–  whereαisthefracFonofνμthattransiFontoνμ

•  νμappearancepredictedbythestandardmodelatthe10‐18levelifneutrinosareMajorana:

P(νμ‐>νμ)~(mν/Eν)2

•  AlsopredictedataverylowlevelbymodelswithalargeneutrinomagneFcmoment,neutrinodecayandotherexoFcprocesses(LangackerandWang,Phys.Rev.D58:093004)

P(ν µ →ν µ ) =α sin2(2θ)sin21.27Δm2L

E

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NuMINeutrinoBeam

•  120GeVprotonsstriketarget•  10μslongpulseof~3x1013protons

every2.2seconds(275kW)

•  TwomagneFchornsfocussecondaryπ/K•  decayofπ/Kproduceneutrinos

•  Variableneutrinobeamenergy

Low Med. High

Page 10: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

BeamFlavourComposiFon

•  ThechargedcurrentinteracFonsintheNeardetectorcompriseof:o  91.7%νμ

o  7.0%νμ

o  1.3%νeandνe•  Significantdifferenceinthe

energyspectrum:o  νμpeakat3GeV

o  νμpeakat8GeV

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Page 11: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

Whyarethespectrasodifferent?

•  Majorityofνμcomefrom“neck‐to‐neck”low‐pTπ−thattraveldownthecentreofthehornswherethereiszeromagneFcfield

•  νμspectrumdominatedbyfocusedhigh‐pTπ+

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π−

π+120GeVp+

Target FocusingHorns

2 m

675m

νμ

νμ

15m 30m

DecayPipe

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MINOSDetectors

Far Detector

Near Detector

•  Massive –  1 kt Near detector –  5.4 kt Far detector

•  Similar as possible –  steel planes

•  2.5 cm thick –  scintillator strips

•  1 cm thick •  4.1 cm wide

–  Wavelength shifting fibre optic readout

–  Multi-anode PMTs –  Magnetised (~1.3 T) JeffHartnell,RALSeminar,July'09

Page 13: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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MINOSEventTopologies(MC)νµCCEvent NCEvent νeCCEvent

long µ track+ hadronic activity at vertex

short, with typical EM shower profile

short event, often diffuse

3.5m 1.8m 2.3m

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AccumulatedBeamData

RUN I

1.27x1020 POT

Higher energy beam

0.15x1020 POT

RUN II

1.87x1020 POT RUN III

~4x1020 POT

First νµCC paper (2006) 2008 νµCC paper & latest results

Run III Analysis in progress

Page 15: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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MuonNeutrinoDisappearanceAnalysis

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ExperimentalApproach•  TwodetectorexperimenttoreducesystemaFcerrors:

–  Flux,cross‐secFonanddetectoruncertainFesminimised–  MeasureunoscillatedνµspectrumatNeardetector

•  extrapolateusingMC–  ComparetomeasuredspectrumatFardetector

1 2

1

2

Page 17: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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AllowedRegion•  Energy spectrum fit with

the oscillation hypothesis:

•  Results:

|Δm232|=(2.43±0.13)x10‐3eV2

at68%C.L.

sin2(2θ23)>0.90

at90%C.L.

PRL 101 131802 (2008)

Most precise measurement of |Δm232| performed to date

Page 18: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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WhatabouttheMuonAn8‐Neutrinos…

νμ+Nμ++hadrons

νμ+Nμ‐+hadrons

Page 19: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

SelecFngνμ

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•  νμCCeventsare7%ofbeam

•  SearchingforνμCCamongstalargesampleofotherevents:–  Mis‐idenFfiedνμCCwhereμ

chargesigniswrong

–  NeutralCurrent(NC)eventswhereanotherparFclefakesaμ+track

•  NCeventswithatrackare~50:50,posiFve:negaFvechargesign

•  DevelopcutstoremovecontaminaFon–  Cuton3addiFonalvariables

All events with a positive curvature track

Page 20: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

AddiFonalSelecFonVariables

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1)  LikelihoodbasedCC/NCseparaFonparameterdevelopedforpreviousanalyses  RemovesbothNCandmis‐idenFfiedνμCC

events

2)  Trackfitchargesignsignificance3)  RelaFveangle

–  measureofwhetherthetrackcurvestowardsorawayfromthemagneFccoilhole,relaFvetoitsiniFaldirecFon

Page 21: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

EfficiencyandContaminaFon

•  A|erallcuts:–  Neardetector

•  Efficiencyof87%

•  ContaminaFonof5%

–  Fardetector•  Efficiencyof82%•  ContaminaFonof3%

•  OpFmisedforphysicssensiFvitytoCPTconservingoscillaFons

–  lowercontaminaFonispossiblebutatthecostofevents

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Monte Carlo

Monte Carlo

Page 22: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

NearDetectorνμ•  Unlikeforνμmovingtargetor

changinghorncurrentdoesnotprobethepT/pZspace–  νμspectrumisthesameto10%in

allbeamconfiguraFons

•  HadronproducFoninthebeamtargetismodeledbyFluka05–  SparsehadronproducFondata–  PredicFonuncertaintyis~20%

•  FitNeardetectordatatoahadronproducFonmodel–  Resultforπ+/π−raFogreatsuccess:

agreeswellwithnewNA49data•  Eur.Phys.J.C49897(2007)

–  Doesn’tsignificantlyaffecttheFardetectorpredicFon

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Page 23: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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NeartoFarExtrapolaFon•  Neardetectorspectrum≠Fardetector

–  Projectdifferentsolidangles–  Non‐pointsourceforNeardetector–  π/KdecaykinemaFcs

• averageneutrinoenergyvarieswithangle

Far Detector Decay Pipe

π+/− Target

Near Detector

p

Eν ~ 0.43Eπ / (1+γπ2θν2)

Page 24: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

BeamMatrixExtrapolaFon

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•  AbeammatrixtransportsmeasuredNearspectrumtoFar–  νμandνμareextrapolatedindependently

•  MatrixencapsulatesknowledgeofmesondecaykinemaFcsandbeamlinegeometry–  MatrixelementMijreflectstheprobabilityofobtainingaFareventwith

energyEjgiventheobservaFonofaNeareventwithenergyEi•  MCusedtocorrectforenergysmearingandacceptance

Monte Carlo

Page 25: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

SystemaFcUncertainFes•  Errorsthatarethesameastheνμanalysis

–  Normalisa8on:±4%–  RelaFvereconstrucFoneff.,detectorliveFmeandmass

– Muonenergy:range±2%,curvature±4%•  (ErrorfromcurvatureincreasedslightlyduetoexiFngtracks)

–  Beamextrapola8on:1σerrorbandfrombeamfit

–  Rela8veshowerenergy:±3%–  Absoluteshowerenergy:±10%

•  Errorsthatarespecificforthisanalysis–  Decaypipeproduc8on:±40%–  Background:±50%

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Page 26: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

TotalSystemaFcUncertaintyonFarDetectorPredicFon

•  AddedsystemaFcuncertainFesinquadrature

•  Overalluncertaintyis<10%acrossallenergies–  significantlylessthan

staFsFcalerror

•  Dashedlineshowsthe4%normalisaFonuncertainty

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TheFarDetector…

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Page 28: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

PredictedFarDetectorSpectrum

•  PredictedeventswithCPTconservingoscillaFons:–  58.3±7.6(stat.)±3.6(syst.)

•  PredictedeventswithnulloscillaFons:–  64.6±8.0(stat.)±3.9(syst.)

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Page 29: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

FarDetectorSpectrum

•  Observe42eventsintheFardetector

•  FirstdirectobservaFonofνμinanacceleratorlong‐baselineexperiment

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•  PredictedeventswithCPTconservingoscillaFons:–  58.3±7.6(stat.)±3.6(syst.)

•  PredictedeventswithnulloscillaFons:–  64.6±8.0(stat.)±3.9(syst.)

Page 30: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

StaFsFcalContext•  ComparedtotheCPT‐

conservingoscillaFonhypothesiswehaveadeficitof16.3events

•  UsingnormalisaFoninformaFonalonethisisa1.9sigmaeffect

•  Astudyusing100,000fakeexperimentsincludingsystemaFcsgavetheprobabiliFesinaccordancewithexpectaFons

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Page 31: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

Resultsoffits

1.)Disappearance:oscilla8onmodel

2.)Appearance:fracFonofeventstransiFoningfromνμtoνμ

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Page 32: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

AllowedRegion•  Contoursobtainedusing

Feldman‐Cousinstechnique,includingsystemaFcs

•  NulloscillaFonhypothesisexcludedat99%

•  CPTconservingpointfromtheMINOSneutrinoanalysisiswithin90%contour

•  νμbestfitisathighvalue,duetodeficitathighenergy

•  Unshadedregionaroundmaximalmixingisexcludedat99.7%C.L.

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Page 33: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

ComparisontoGlobalFit

•  Globalfittopreviousdata–  Super‐Kamiokandedominates

–  IncludesSK‐IandSK‐IIdata–  M.C.Gonzalez‐Garcia&Michele

Maltoni,Phys.Rept.460(2008)

•  MINOSdataexcludespreviouslyallowedCPTviolaFngregionsofparameterspace

•  Atmaximalmixingexclude:–  (5.0<Δm2<81)x10‐3eV2(90%C.L.)

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Page 34: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

Resultsoffits

1.)Disappearance:oscillaFonmodel

2.)Appearance:frac8onofeventstransi8oningfromνμtoνμ

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Page 35: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

ResultsofSearchforνμAppearance•  MINOSobservesno

appearanceofνμintheNuMIbeam

•  1‐parameterfitforαusingsimpleparameterisaFon

(θandΔm2settoCPTconservingcase)

•  Uncertaintyfromνμ/νμcrosssecFonraFo

•  Result:limitfracFon,α,ofeventstransiFoningfromνμtoνμ:o  α<0.026(90%C.L.)

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P(ν µ →ν µ ) =α sin2(2θ)sin2 1.27Δm2L

E

90%

Page 36: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

Futureplans

a.)Updateanalysiswithmorethandoublethedataset

b.)Dedicatedνμrun

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Page 37: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

•  PlantoreversecurrentinNuMImagneFchornstofocusπ−fromSeptember

•  createaνμbeam

•  MINOScandirectlyobserveνμ disappearanceat7σwith5x1020POT

•  rapidlyreducetheuncertaintyonΔm2

32

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DedicatedνμRunning

Page 38: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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ElectronNeutrinoAppearanceAnalysis

Page 39: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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νµ→νeOscillaFonSearchOverview•  Sub‐dominantneutrinooscillaFons

– LookforνeappearanceatFardetector•  P(νµ→νe)≈sin2θ23sin22θ13sin2(1.27Δm2

31L/E)

–  alsoCPvandma�ereffects:notshownherebutincludedinfit

– Electronneutrinoeventsonly2%oftotal(atChoozlimit)

•  Selecteventsw/compactshower,typicalEMprofile– MINOSopFmisedforνµ–  νesignalselecFonisharder

•  Steelthickness2.5cm=1.4X0•  Stripwidth4.1cm~Molièreradius(3.7cm)

•  UsetheNeardetectortodeterminethebackground

Page 40: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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SelecFngνeEvents

•  11variableschosendescribinglength,widthandshowershape

•  ANNalgorithmachieves:•  signalefficiency41%•  NCrejecFon>92.3%•  νμCCrejecFon>99.4%•  signal/background1:4

at Chooz limit

Area Normalised

Page 41: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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MCEventComposiFonin2Detectors

•  PrimarybackgroundfromNCevents,also•  high‐yνµCC,beamνe,oscillatedντatFardetector

•  Rightplot:purpleshowsanappearancesignalattheChoozlimit(sin22θ13=0.15)

Page 42: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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NearDetectorData•  O(20%)data/MC

differencesinNeardet.–  notsurprising,strong

backgroundrejecFonleavesjusttailsofdistribuFons

–  suchdifferencesareexpectedfromtheuncertainFesintheMCsimulaFonofthehadronisaFonmodel

•  tunedtosparseexternaldata

•  UseadatadriventechniquetomeasureNeardetectorbackground–  comparehornon/offdata

•  fitforCCandNCcomponents

Use measured Near detector background and MC to extrapolate to the Far detector

Page 43: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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PreliminaryUncertainFesonBackground

•  StaFsFcalerrordominates

•  SystemaFcerrorprimarilyfromextrapolaFngNeardetectormeasurementofbackgroundtoFardetector

PreliminaryUncertain8es Sizeoferror

1.)ExtrapolaFonsystemaFc 6.4%

2.)Hornon/offsystemaFc 2.7%

3.)Hornon/offstaFsFcal 2.3%

Total(suminquadrature) 7.3%

Sta8s8calerror(data) 19%

Page 44: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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FarDetectorEnergySpectrum

•  Ablindanalysiswasperformed:–  allproceduresfor

calculaFngbackgroundandsignalwerefinalisedbeforetheFardetectordatawerelookedat

Fit the data to the oscillation hypothesis, obtain the signal prediction for the best fit point

•  Expectedbackground: 27±5(stat)±2(sys)•  Observedevents: 35

•  A1.5σexcessoverbackgroundpredicFon

Page 45: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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AllowedRegion•  AFeldman‐Cousins

methodwasused

•  Fitsimplytothenumberofeventsfrom1‐8GeV

•  Bestfitand90%C.L.limitsareshown:•  forbothmass

hierarchies

•  atMINOSbestfitvalueforΔm2

32 & sin2(2θ23)

Allowed region (Δm2>0)

•  Results:Normalhierarchy(δCP=0):

sin2(2θ13)<0.29(90%C.L.)

Invertedhierarchy(δCP=0):

sin2(2θ13)<0.42(90%C.L.)

Page 46: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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InterpretaFon

•  A1.5sigmaexcessiswellwithintherealmsofastaFsFcalfluctuaFon

•  Futureνeappearanceanalysis:– updatedMCandreconstrucFon– usemorethandoublestaFsFcs

– otheranalysisimprovementstoo– aimtorelease2ndresultearlynextyear

•  Watchthisspace!

Page 47: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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NeutralCurrentAnalysis

‐Lookingforsterileneutrinomixing‐

Page 48: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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•  GeneralNCanalysisoverview:–  AllacFveneutrinoflavours

parFcipateinNCinteracFon

–  Mixingtoasterile‐νwillcauseadeficitofNCeventsinFarDet.

–  Assumeonesterileneutrinoandthatmixingbetweenνμ,νsandντoccursatasingleΔm2

•  SurvivalandsterileoscillaFonprobabiliFesbecome:

(αμ,s=mixingfracFons)

SimultaneousfittoCCandNCenergyspectrayieldsthefracFonofνμthatoscillatetoνs:

NeutralCurrentAnalysis

[Previousresult:PRL101221804(2008)]fs < 0.55 (90% C.L.)

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TestsofLorentz/CPTViolaFonusingNearDetectorEvents

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Page 50: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

TestsofLorentz/CPTViolaFon•  SMextensionssuggestthatneutrinoscoupletoaLorentzfieldin4Dspace–  neutrinos’interacFonwiththefielddependsonthedirecFonoftravel

•  TerrestrialneutrinobeamswouldshowvariaFonsonthescaleofasiderealday:

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•  Results:–  rateandFFTconsistentwithconstantvalue

–  limitsonSMextensionparameters1‐3ordersofmagnitudelowerthanpreviouslimitsPRL101151601(2008)

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Page 52: MINOS: Latest Results and Future Plans - PPD · Jeff Hartnell University of Sussex RAL Seminar, July 22nd 2009 MINOS: Latest Results and Future Plans

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SNO+

•  Fundamentallydifferentapproach– Searchforneutrinolessdoublebetadecayusingkilo‐tonscalescinFllatordetector

– FilltheexisFngSudburyNeutrinoObservatory(SNO)detectorwith800tonsofliquidscinFllator

– 0.1%loadingisO(1ton)ofneodymium–  gives50kgof150Nd(~5%naturalabundance)

– Canprobe•  Absoluteneutrinomassscaleintheinvertedhierarchyscenario(50meV)

•  Majorana/Diracnatureofneutrinos(ownanFparFcle?)

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Oneyearwith0.1%ofnaturalNd‐loadedliquidscinFllatorinSNO+:

Example: Test <mν> = 0.150 eV Klapdor-Kleingrothaus et al., Phys. Lett. B 586, 198, (2004)

Better suppress 208Tl and enhance loading (or enrich) to increase sensitivity further

small but statistically significant distortion

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PotenFaltobeWorldBeaFngExpt.

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Furthermore…amulFfacetedExpt.•  First/bestmeasurementofsolarpepneutrinos

– excellentprobeofneutrino‐ma�erinteracFon

•  Geo‐neutrinos– measureradiogenicporFonofEarth’sheatflow–  inputtomodelsofEarth’schemicalorigin/composiFon

•  Nuclearreactorneutrinos–  improveknowledgeofneutrinooscillaFonparameters

•  Supernovaneutrinos–  informaFononcorecollapseandoscillaFons

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SNO+Status•  Full Canadian funding (CFI) approved last

month– project will definitely go ahead

•  UKPRDfundingrequestsubmi�edinOctober…awaiFngSTFCdecision– wesFllintendtosubmitafullproposalin2010,giventhatdetectorturn‐onisexpectedin2011

•  SignificantUKinvolvement:– 9faculty:Sussex,Oxford,LeedsandQMUL(alsoLiverpoolpossibly)

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Conclusions•  MINOShasanalysed3.2x1020POTofbeamdata(7.6x1020POTdatanowtaken)

•  Muonneutrinodisappearance–  |Δm2

32|=(2.43±0.13)x10‐3eV2(68%C.L.)–  sin2(2θ23)>0.90(90%C.L.)

•  FirstdirectobservaFonofνμinanacceleratorlong‐baselineexperiment

•  Searchforelectronneutrinoappearance–  1.5σexcessoverbackgroundpredicFon

•  Searchforsterile‐νmixingfracFon:fs<0.55(90%C.L.)

•  DedicatedνμruntocommenceinSeptember•  ExciFngprospectswithSNO+

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Backupslides

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A. Strumia, F. Vissani, Nucl. Phys. B 726 (2005) 294-316

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FarDetectorDistribuFons

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Focusedμ−fromνμ De‐focusedμ+fromνμ

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FarDetectorEventProperFes•  Thehigheraverageenergyofνμ

meanthatalargefracFonexitthebackofthedetector

•  Eventsaretypically100‐200planeslong

•  ShapesofdistribuFonsconsistentwith42events

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