CosmicOverlayStudiesinProtoDUNE-SP

LeighWhitehead

31/10/16

Introduction• IamanewCERNfellowworkinginthenewneutrinogroup

• Amongstotherthings,Iwanttoknowhowthecosmicraysaregoingtoaffectthereconstruction• Numerousoverlappingtracks• Associationofdelta-rays• MuonBremsstrahlung(orotherphotons?)• etc…

• I’vejustbeenlookingattruthinformationsofartofindmyfeetinthesoftwareframework

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AquestionofTrackIds• StartedofflookingatElizabeth’scosmicrayoverlayfiles

• Seriesofcosmics overlaidon1GeVbeammuons

• Thebeamparticlescanbeselectedusingorigin==4• Theprimarycanthenbeobtainedbyaskingprimary_process==1

• The“Mother”IDforthe(origin==4)particlessuggeststhattheprimarybeamparticleshouldhaveTrackID==1• Thisistrueforjustasingleparticleinteractionwithoutoverlays

• However,allcosmicparticlesareinsertedatlowerTrackIds thanthebeamparticles• BeamprimaryendsupwithaTrackId around400000orso• The“Mother”fieldforthebeamparticlesdoesn’tseemtobeupdatedto

matchthis

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LookingattheCosmics• Inanycase,theTrackId issuedoesn’taffectthecosmics,soI

startedtolookatthese.

• Bydefault,thetrueparticlesthatstartsmallEMshowersarenotstored• Dorota reprocessedafilesuchthatIwouldhaveaccesstothisinformation

• Currentrecipe:• Findallprimarycosmicmuon(andanti-muon)tracks

• Findalloftheelectronsandphotonswhoaredaughtersof thesemuons.• Onlyconsiderthosedaughtersnotoriginating fromthemuonendpoint.• Thisshouldgiveusthedelta-raysandphotons.

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DeltaRays

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DeltaRays

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Looksliketwopopulations here?

Looksmostlylinearasafunctionofmuon tracklength, solikelyageometryeffect.

Bremsstrahlung?

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Firstlookatreconstruction• Firststepistohavealookatsomeeventstoseehowthingsare

working.

• Nextfewslidesshowsometrueandreconstructedviewsofasinglebeammuoneventwithanumberofoverlaidcosmics.

• Beaminteractionsentertheactivevolumeatroughly(90cm,356cm)in(x,y).• Iwillhighlightthestartandendpointsinboth.

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Event1:True

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Event1:Reconstructed

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Lookstobereconstructedcorrectlyasasingletrack.

Event2:True

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Event2:Reconstructed

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Trackseemstohavebeensplitintothreesegments:firstlyatanoverlap,thenasitcrossesTPCs.

Event3:True

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Event3:Reconstructed

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Lookstobereconstructedcorrectlyasasingletrack.

Summary• Startedtolookintotheeffectofcosmicsonthebeamparticle

reconstruction.• Simpletruthleveldistributionssofar.

• Willmoveontolookingattheoutputsofthereconstructionandtrytomatchuptheclusterswiththedeltaraysandphotons.• Havestartedhandscanningafeweventsintheeventdisplay.

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