VertexReconstruc-onMethodComparisonforAtmospheric

Neutrinos

JoshuaMills,HughGallagher,Ka-eMason,GlennVanWinkle

DUNEMee(ng–September13,2017

What’sBeingDone

9/13/17 JoshuaMills–TuCsUniversity

•  TwoReconstruc(ontools,PMTrack,andPandora,arebeingcomparedintheirabilitytocorrectlyplacethevertexofanatmosphericneutrinoeventintheDUNEfardetector.

•  Cutsaremadetoonlyincludeonlyreconstruc(onsofchargedcurrentmuoneventsinthefiducialvolumewithatleastonevertexplaced,andinthecaseofthelongesttrackmethod,onlyeventswith>0tracks

•  Bringsnumberofeventsfrom10,000downto~2050inbothPandoraandPMTracksfor‘cheat’methodanddownto~1000forthelongesttrackmethod

•  Currentlyusingachea(ngmethodoftakingthenearestreconstructedvertexfromeachreconstruc(onmethodtoserveasa‘bestcase’scenario,andamethodchoosingvertexbasedonproximitytoeitherendofthelongesttrack

FilesUsed:--standard_ana_dune10kt_1x2x6.fcl--/pnfs/dune/tape_backed/dunepro/mc/dune/full-reconstructed/01/55/07/70/prodgenie_atmnu_max_dune10kt_1x2x6__20161213T031412_merged0.root

PreviousWork

9/13/17 JoshuaMills–TuCsUniversity

•  AnalysisofthistypehasalreadybeenperformedbyYujingSunandTingjunYang,andwaspresentedinMay2017attheCollabora(onMee(ng.Howevertheirworkfocusedonbeamlineneutrinos.

•  Theyusetworealis(cvertexchoicemethods,pairingtothelongesttracklength,orchoosingthefurthest‘upstream’vertex(lowestz-coordinate)

•  TheyconcludethattheupstreamchoicepairedwithPandorareconstruc(ongivesthebestvertexchoice,howeverthischoicemethodisn’tviableforatmosphericneutrinoswhichdonothaveaconsistentknownorigin.

hdps://indico.fnal.gov/getFile.py/access?contribId=91&sessionId=12&resId=0&materialId=slides&confId=12345

TheResults(Truth)

9/13/17 JoshuaMills–TuCsUniversity

Reconstruc-onMethod

nEventsAKerCuts

nEventswithin5cm(3D)

AvgnVer-cesReconstructed

CheatMethod Pandora 2049 1296(63%)

3.91

PMTrack 2028 1639(81%)

3.41

LongestTrack Pandora 1910 982(51%)

3.91

PMTrack 2028 1129(56%)

3.41

*InbothcasesPMTrackputsmorever(ceswithinour5cmthresholdandguesseswithfewerver(ces*

NumberofVer-ces

9/13/17 JoshuaMills–TuCsUniversity

Inbothplots:Blue=numuCCDashed=NeutralCurrentRed=nueCC

VertexResolu-onPlots(CheatMethod)

9/13/17 JoshuaMills–TuCsUniversity

Inallplots:BlueisPMTrack,RedisPandora

MorePlots(CheatMethod)

9/13/17 JoshuaMills–TuCsUniversity

Inallplots:BlueisPMTrack,RedisPandora

MorePlots(CheatMethod)

9/13/17 JoshuaMills–TuCsUniversity

1296<5cm(Pandora)1639<5cm(PMTrack)

VertexResolu-onPlots(LongestTrack)

9/13/17 JoshuaMills–TuCsUniversity

Inallplots:BlueisPMTrack,RedisPandora

MorePlots(LongestTrack)

9/13/17 JoshuaMills–TuCsUniversity

Inallplots:BlueisPMTrack,RedisPandora

MorePlots(LongestTrack)

9/13/17 JoshuaMills–TuCsUniversity

982<5cm(Pandora)1129<5cm(PMTrack)

Conclusions

9/13/17 JoshuaMills–TuCsUniversity

•  PMTrackhasaadvantagewhenreconstruc(ngeventswithinour5cmlimit(~25%moreeventswithcheatmethod,and5%morewithlongesttrackmethod)andguessesatlessver(ces.

•  Uniquetwinpeaksinx-coordinatebelievedtoberelatedtomismodelingofthe(mestructureoftheatmosphericneutrino'beam’

•  VertexZ-coordinateweightedtowardtheposi(veend,furtherdownthedetectorchamber.

•  Thedropinchosenver(ceswithinthresholdfrom1296to982(Pandora)and1639to1129(PMTrack)whengoingfromcheatmethodtolongesttrackmethodmaywarrantinves(ga(onintoabedervertexchoosingalgorithmforatmosphericneutrinos.