vertex reconstruc-on method comparison for atmospheric ......• unique twin peaks in x-coordinate...
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VertexReconstruc-onMethodComparisonforAtmospheric
Neutrinos
JoshuaMills,HughGallagher,Ka-eMason,GlennVanWinkle
DUNEMee(ng–September13,2017
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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
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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
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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*
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NumberofVer-ces
9/13/17 JoshuaMills–TuCsUniversity
Inbothplots:Blue=numuCCDashed=NeutralCurrentRed=nueCC
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VertexResolu-onPlots(CheatMethod)
9/13/17 JoshuaMills–TuCsUniversity
Inallplots:BlueisPMTrack,RedisPandora
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MorePlots(CheatMethod)
9/13/17 JoshuaMills–TuCsUniversity
Inallplots:BlueisPMTrack,RedisPandora
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MorePlots(CheatMethod)
9/13/17 JoshuaMills–TuCsUniversity
1296<5cm(Pandora)1639<5cm(PMTrack)
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VertexResolu-onPlots(LongestTrack)
9/13/17 JoshuaMills–TuCsUniversity
Inallplots:BlueisPMTrack,RedisPandora
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MorePlots(LongestTrack)
9/13/17 JoshuaMills–TuCsUniversity
Inallplots:BlueisPMTrack,RedisPandora
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MorePlots(LongestTrack)
9/13/17 JoshuaMills–TuCsUniversity
982<5cm(Pandora)1129<5cm(PMTrack)
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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.