wwww www - university of richmondggilfoyl/research/justin2013dnp.pdfwwww www wwww...

Post on 09-Jul-2020

53 Views

Category:

Documents

0 Downloads

Preview:

Click to see full reader

TRANSCRIPT

ApplicabilitywofwParallelwComputingwtoPartialwWavewAnalysisw(PWA)J.wRugerw-wChristopherwNewportwUniversityG.P.wGilfoylew-wUniversitywofwRichmondD.P.wWeygandw-wJeffersonwLab

wwwwwwwwwwwwwwwwwwwwwwwwwwwwIntroductionJeffersongLaboratorygzJLR9HgisgagUSgnationalglaboratorygbuiltgtogprobegthegatomicgnucleusgandgtogunravelgthegquarkVgluongnaturegofgmatterTgOurgbestgtheorygofgthegstrongginteractiongthatgbindsgnucleigtogethergisgQuantumgjhromodynamicsgzQj+HwhichgisgnotgwellgunderstoodgingthegnucleargenvironmentTgWegaregdevelopinggnewgtechnologiesgtoganalyzegtheglargegdatagsetsgthatgwillgbegproducedgbygonegofgtheglargedetectorsgundergconstructiongingHallg9gasgpartgofggtheg0FGeVgUpgradeT

ggggggggggggggggggggggggggggjLRS0FThegprimaryggoalgofgexperimentsgusinggtheggjLRS0Fgdetectorgatgenergiesgupgtog0FgGeVgisgthegstudygofgtheginternalgnucleongdynamicsTgTowardsgthisgendGgthegdetectorghasgbeengtunedgforgstudiesgofgreactionsgingagwidegkinematicgrangegsuchgasginclusivegprocessesTgTheglargegacceptancegofgjLRS0FgleadsgtoghighgdatagratesgsincegmostgofgthegdebrisgfromgthegcollisiongofgthegelectronbeamgwithgthegtargetgisgdetectedTgThegcomputationalgrequirementsgtogacquireGgreconstructGganalyzeGgandgsimulategthesegdatagareghighTgWegexpectgtogcollectgaboutg0,G,,,geventsgpergsecondgwheregeachgeventgcontainsg0,gk9ytesgofgdataTgForgtypicalgrunningGgthisgrategmeansgwegwillggathergaboutgMG,,,gG9ytesgpergdaygandghavegtogstoregaboutgonegmilliongG9ytesgeachgyearTgItgisgtheggoalgofgourggroupgtoghavegthegsoftwaregingplacegongthegdaygofgfirstgbeamsgingjLRS0FgtogcalibrateGgreconstructGgandganalyzegthesegnewgdatagandgtogkeepgpacegwithgtheghighgratesT

ggggggggggggggggggggggggMotivationgggTogunderstandgthegstrongginteractionGgorgQuantumgjhromodynamicsgzQj+HitgisgnecessarygtogunderstandgthegspectrumgofgboundgstatesgofgtheginteractionGthatgisgmesonsgandgbaryonsTgOnegofgthegbestgtoolsgforgtheganalysisgofgthesereactionsgisgPartialgWavegRnalysisgzPWRHTgUsinggPWRgwegcangextractgthegpropertiesgofgindividualgparticlesgfromgoverlappinggmassgspectragasgseengingFigTg5gandgFigTgITgWeGgwhenganalyzinggjLRS0FgdataGgwillghavegtoganalyzegmillionsgofgeventsgthatgmaygrequiregthesegcomputationallygintensivegcalculationsTggggggPWRgrequiresgfittinggangulargmomentumgstatesgtoglargegsetsgofgdataTgRtg3,,gmsgpergeventgpergwavegitgwillgtakegroughlygninegmonthsgtogdogonegfitgongthegdatagscalegthatgjLRS0FgacquiresTgThisgtimingganalysisgtakesgintogaccountgthegnumbergofgwavesGgnumbergofgeventsgandglikelihoodgcalculationsTgggggggThegmotivationgforgpursuinggresearchgwithgXeongPhiWsgandgitsgusegingPartialgWavegRnalysisgisgtogminimizegthegoverallgtimegrequiredgtogperformgcalculationsT9ygexploitinggthegvectorgandgmultiVthreadinggcapabilitiesgofgthegMIjgprocessorgavailablegfromgIntelGgtheglikelihoodgfunctiongzFigTgIHgisgmultiVthreadedgtogenhancegperformancegofgPWRgcalculationsTgg

ggggggggggggggIntelgXeongPhi1gJeffersongLabghasgag0PVnodegIntelgXeongPhigzMIjHgcluster1gEachgnodegcontainsgIgIntelgXeongPhigM00,PgjoVprocessors1gIntelgXeongPhigM00,Pgggggg1gP,gcoresgforgagtotalgofgFI,gthreadsgatg0T,M5gGHzgggggg1gSupportsg0Pgsinglegprecisiongorg4gdoublegprecisiongcalcT1gJeffersongLabgoffersguniquegcapabilitygofgrunninggggapplicationsgeithergingnativegmodegongthegjPUgorgggthroughgoffloadingggfromgtheghostT1gjreatinggmultiVthreadedgsoftwaregpackagesgisgeasygggwithgthegPhiWsgusinggOPENVMPgandgOPENVMPITg1gjodegcreatedgforgthegXeongPhigcangbegrangongsingleggthreadedgplatformsgorgGPUgincreasinggvalueT

gg

ggggggggjomputationgResultsRgrepresentationgofgthegprocessinggpowerggainedgfromgtheginclusionofgagXeongPhigisgagcomparisongofgthegrungtimegforgPWRglogVlikelihoodcalculationgversusgthegnumbergofgcalculationsgdeployedgongthegXeongPhigandgHostgmachineTgFiguregMgshowsgthatgusinggthegXeongPhigdecreasedgthegprocessinggtimegbygagfactorgofg0PTgThisgwillgreducegthetimegneedgtogdogtheg7gmonthgPWRgfitgtalkedgaboutgingmotivationgtogaboutgtwogweeksT

gg

TogshowgthegabilitygofgthegXeongPhigtogmultiVthreadglogVlikelihoodgcalculationsGgFiguregPgrepresentsgthegparallelgscalinggovergavailablegthreadsTgThegdatagshowedgthatgmaximumgefficiencygwasgfoundgusinghalfgthegavailablegthreadsTgThisgwillglimitgthegamountgofgtimegspentginthreadgmanagementghavingg0F,gthreadsgalwaysgavailableT

ThegresultsgshowgpromisegingusinggthegIntelgXeongPhigforcomputationallygintensivegcalculationsTgThegabilitygtogdecreasegrungtimegbygagfactorgofg0PgallowsgdatagprocessinggtoghappengquickergandgminimizesgthegamountgofgtimegspentgpergfitT

gggggggggggggggggggggRcknowledgmentsIgwouldglikegtogthankg+rTgJerrygGilfoylegandgthegUniversitygofgRichmondgforgthegfundinggandgopportunitygtogresearchgPWRTgSecondGgIgwouldglikegtogthankgg+rTg+ennisgWeygandgforgthegcomputationalgguidancegreceivedgduringgtheprojectTgLastGgIgwouldglikegtogthankg+rTg9alintgJoogforghisgknowledgegandguidancegwhengworkinggwithgthegXeongPhigandgJeffersongLabWsgXeongPhigjlusterT

π2gπ2gπVgmassgspectrum

a0z0FP,HaFz05F,H

piFz0P3,H

FigTg5

FigTgI

FigTg0 FigTgF

Phaseg+ifference

ThegModel

isobar

rawgmassgspectrum

gggOurggoalgisgtogfindgagmathematicalgparametrizationgthatgexplainsgthegexperimentalgobservationgthatgisgdifferentialgcrossgsectionsgzFigTg0HTgRgmajorgportiongofgthisgparametrizationgisgthegcalculationgofgthegLikelihoodgfunctiongzLHGgwhichgisgdefinedgasgagproductgofgprobabilitiesTgLgiscalculatedgusinggthegquotientgofgthegIntensityg+istributiongzIzτHHgandgnormalizationgintegralTgIngLGthegtermgoutsidegthegproductgingFigTgFgisgthegPoissongprobabilitygofgobservinggngeventsgandgreflectsgthegfactgthatgwegusegthegextendedgmaximumglikelihoodgmethodTgThegintegralgingthegdenominatorgofgthegsummedgtermgcontainsgthegacceptancegηzτgHgandgisgthegacceptedgnormalizationgintegralTggggRngindependentgcalculationGgIzτHGgisgagsumgofgamplitudesGgsquaredgtogaccountgforginterferencegwithgthegvariablegτgrepresentinggthegsetgofgvariablesgnecessarygtogdefinegagconfigurationgofgthefinalgstateTgWithingIzτHGgthegvariablesgVgandgRGgrepresentgthegproductiongandgdecaygamplitudesgrespectivelyTgThegsubscriptsgkgandgβgforgVgandgRGgaregthegparametersgthatgdescribegthegpartialgwavegdecompositiongwegaregusingGgαgspecifyinggpropertiesgofgthegdifferentgintermediategstatesgthatgdognotginterfereGgsuchgasgthegspingstatesgofgthegincominggorgoutgoinggparticlesgingthegdetectorTgThegsubscriptgβGgongthegotherghandGgrepresentsgthegpropertiesgwhosegdifferinggvaluesgdoginterfereGgforginstancegthegspingstatesgofgbroadgresonancesgproducedgasgintermediategstatesingagsequentialgdecayTgggUsinggthegcalculationsgfromgaboveGgPWRgisgablegtogextractgthegpropertiesgofgthegindividualgparticlesgasgseengbelowTgFigureg5Ggrepresentsgthegrawgmassgspectrumgofgπ2gπ2gπVgfromgelectrongscatteringgongthegprotonTgWhileGgFiguregIgrepresentsgthegextractedgpropertiesgfromgthegrawgmassgspectrumTgRsgseengbelowGgusinggPWRgallowsgusgtogfindgthegπFz0P3,HgparticlegthatgwasghiddengbehindgthegaFz05F,HgingunprocessedgdataTg

g

gggggg

FigTgM

FigTgP

top related