Physics of the B-factories, MVA chapter 12nd workshop, KEK, May 2010 José Ocariz LPNHE – IN2P3 et Université Paris Diderot On behalf of the MVA chapter.
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Physics of the B-factories, MVA chapter 1 2nd workshop, KEK, May 2010
José OcarizJosé Ocariz
LPNHE – IN2P3 et UniversitLPNHE – IN2P3 et Universitéé Paris Diderot Paris Diderot
On behalf of the MVA chapter editors and contributorsOn behalf of the MVA chapter editors and contributors
Multivariate Analysis :optimisation → tagging, PID, BKG suppression
1st “large” report
Physics of the B-factories, MVA chapter 2 2nd workshop, KEK, May 2010
Outline
Summary of decisions taken during 1st workshop at SLAC
Reorganisation of the former “MVA/Analysis Optimisation” chapters
Status of various subchapters
General Introduction / Analysis OptimisationTagging algorithmsPID algorithmsContinuum-suppresion algorithms
Manpower, timing issues
Physics of the B-factories, MVA chapter 3 2nd workshop, KEK, May 2010
Outcome from 1st worksop : reorganisation
From the 1st “strawman draft” :
a few disconnected chaptersflavour taggingmultivariate discriminantsanalysis optimisation
all refer to tools/methods based on similar methods
about 50 pages in total in 1st count
yet PID missing from listnot suitable for detector part
Physics of the B-factories, MVA chapter 4 2nd workshop, KEK, May 2010
Outcome from 1st worksop : reorganisation
(retained) reorganisation proposal :
a single chapter, with 4 sectionsa general introduction :
structures the overall landscapeuseful for students
3 specific applications :tagging, PID, bkg suppression
easier to manage (and decrease page length)
Physics of the B-factories, MVA chapter 5 2nd workshop, KEK, May 2010
Analysis optimization
SectionAnalysis optimizationSubsection
IntroductionNotationsFigures of meritMethodsSubsubsection
Rectangular cuts Linear discriminants
Neural netsBinary decision treesBoostingBaggingRandom Forest
Subsection Available tools Main section editor
Frank PorterIdentified contributors
Ilya Narski, José OcarizBelle ?
Main features :Pedagogical introductionFix notations
framework reference for thespecific applications following
± 6-8 pages
Physics of the B-factories, MVA chapter 6 2nd workshop, KEK, May 2010
Flavor tagging
SectionFlavor taggingSubsection
IntroductionDefinitionsPhysics souces of tagging informationMultivariate methods usedThings we tried, what worked, what didn’t ?
SubsectionFlavor tagging algorithms
BaBar and Belle algorithmsCategories
SubsectionMeasuring flavor tagging performance
History of tagging performance in Belle and BaBar Subsection
Systematic effectsTag-side interference
Main section editor(s)Juerg BeringerBelle ?
Main features :Example of MVA applicationSpecific to B-factories To be broadly referenced
± 8 pages
Physics of the B-factories, MVA chapter 7 2nd workshop, KEK, May 2010
Particle Identification
Main section editor(s) : TBD!Potential contributorsongoing contacts (BaBar), Belle ?
SectionParticle IdentificationSubsection
IntroductionDefinitionsDetector and physics souces of PIDMultivariate methods used
SubsectionPID algorithms
BaBar and Belle algorithms Subsection
Measuring PID performanceHistory of PID performance in Belle and BaBar
SubsectionSystematic effects
Main features :Example of MVA applicationLarge references to detector partDoes not fit into detector partTo be broadly referenced
± 6-8 pages ?
Outline could look like :
Physics of the B-factories, MVA chapter 8 2nd workshop, KEK, May 2010
Background suppression
SectionBackground suppression
SubsectionIntroductionSources of backgrounds: continuum, B-relatedSubsectionKinematical discrimination
mES/Mbc, E, intermediate resonant masses, angular distributions
SubsectionTopological discrimination
Information from complete event and/or ROEThrust, B momentum, energy flow, Legendre, SFW, etc…
SubsectionOptimisation criteria
S/B, significance, minimize systematics, CPU-related.linear vs. non-linear, treatment of correlations, etc…
SubsectionHistory SubsectionValidations, systematics
Main features :Various examples of MVA appsTo be broadly referenced
Feedback/interplay with physics chapters
Main section editorsHidekazu Kakuno, José Ocariz
Identified contributorsseveral volunteers (BaBar) ± 8 pages
Physics of the B-factories, MVA chapter 9 2nd workshop, KEK, May 2010
MVA-related topics
Discussion of some interesting MVA-related topics (e.g. time-evolution of performances, of optimisation criteria)would add value to the pedagogical purpose of the bookimplementation foreseen in the tagging and PID sections for bkg suppression, would be better illustrated with physics examples
Example from BaBar : optimisation criteria in B→,Ksuppress continuum vs. minimize systematicsdifferent requirements for CP analyses vs. BR analyses
could be discussed in the charmless chapters or here
Example from BaBar : background suppression in charmless Dalitz B→hhhtreatment of non-linear correlations wrt Dalitz variables“external” technical considerations (i.e. CPU)could be discussed in the charmless, Dalitz chapters or here
Decisions on whether/where to include such topics :requires discussion with global and physics editorsmay bring forward-referencings and (mild )revisiting of section structureneeds to check relevance on the Belle side
Physics of the B-factories, MVA chapter 10 2nd workshop, KEK, May 2010
Structure, manpower, timing issues
Overall chapter/section structuredesigned to ensure global coherence and minimize redundanciessuits the pedagogical purpose of the book
Manpowertagging, background-suppression ±OK …… less true for PID…
a few important contacts yet to be established need both BaBar/Belle contributors on all sections
→ homework for us chapter editors!
Timingmost chapter writing could start nowinterplay/feedback with physics chapters
check for specific needs and redundancieschannel-oriented illustrations of specific MVA features
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