28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour PhysicsDiscoveries in Flavour PhysicsFrascati, ItalyFrascati, Italy 11

Why do we need a super Why do we need a super tau/charm factory?tau/charm factory?

David AsnerDavid AsnerCarleton UniversityCarleton University

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 22

-charm Physics Topics-charm Physics TopicsCharm MesonsCharm Mesons– Absolute Branching Absolute Branching

FractionsFractions– CKM PhysicsCKM Physics– Dalitz PlotsDalitz Plots– Rare Decays Rare Decays – Charm MixingCharm Mixing– CP ViolationCP Violation

Charm BaryonsCharm Baryons– cc Absolute Branching Absolute Branching

FractionsFractions– Form FactorsForm Factors

Precision R scanPrecision R scan

CharmoniaCharmonia– Study of J/Study of J/ , , ’, ’, cjcj– Y(4260), Y(4260), (4160), (4160),

(4040)(4040)TauTau– Tau massTau mass– Absolute BFAbsolute BF– Dipole momentsDipole moments– LifetimeLifetime– CPT, CPVCPT, CPV– Lepton universalityLepton universality– Lepton flavor violationLepton flavor violation– mmss,V,Vusus

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 33

-charm Physics Topics-charm Physics TopicsCharm MesonsCharm Mesons– Absolute Branching Absolute Branching

FractionsFractions– CKM PhysicsCKM Physics– Dalitz PlotsDalitz Plots– Rare Decays Rare Decays – Charm MixingCharm Mixing– CP ViolationCP Violation

Charm BaryonsCharm Baryons– cc Absolute Branching Absolute Branching

FractionsFractions– Form FactorsForm Factors

Precision R scanPrecision R scan

CharmoniaCharmonia– Study of J/Study of J/ , , ’, ’, cjcj– Y(4260), Y(4260), (4160), (4160),

(4040)(4040)TauTau– Tau massTau mass– Absolute BFAbsolute BF– Dipole momentsDipole moments– LifetimeLifetime– CPT, CPVCPT, CPV– Lepton universalityLepton universality– Lepton flavor violationLepton flavor violation– mmss,V,VususX

No compellingreason to runat -threshold ~ ~ 1nb

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 44

-charm Physics Topics-charm Physics TopicsCharm MesonsCharm Mesons– Absolute Branching Absolute Branching

FractionsFractions– CKM PhysicsCKM Physics– Dalitz PlotsDalitz Plots– Rare Decays Rare Decays – Charm MixingCharm Mixing– CP ViolationCP Violation

Charm BaryonsCharm Baryons– cc Absolute Branching Absolute Branching

FractionsFractions– Form FactorsForm Factors

Precision R scanPrecision R scan

CharmoniaCharmonia– Study of J/Study of J/ , , ’, ’, cjcj– Y(4260), Y(4260), (4160), (4160),

(4040)(4040)TauTau– Tau massTau mass– Absolute BFAbsolute BF– Dipole momentsDipole moments– LifetimeLifetime– CPT, CPVCPT, CPV– Lepton universalityLepton universality– Lepton flavor violationLepton flavor violation– mmss,V,VususX

No compellingreason to runat -threshold ~ ~ 1nb

Precision results from BESIII, Radiative B-factory

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 55

-charm Physics Topics-charm Physics TopicsCharm MesonsCharm Mesons– Absolute Branching Absolute Branching

FractionsFractions– CKM PhysicsCKM Physics– Dalitz PlotsDalitz Plots– Rare Decays Rare Decays – Charm MixingCharm Mixing– CP ViolationCP Violation

Charm BaryonsCharm Baryons– cc Absolute Branching Absolute Branching

FractionsFractions– Form FactorsForm Factors

Precision R scanPrecision R scan

CharmoniaCharmonia– Study of J/Study of J/ , , ’, ’, cjcj– Y(4260), Y(4260), (4160), (4160),

(4040)(4040)TauTau– Tau massTau mass– Absolute BFAbsolute BF– Dipole momentsDipole moments– LifetimeLifetime– CPT, CPVCPT, CPV– Lepton universalityLepton universality– Lepton flavor violationLepton flavor violation– mmss,V,VususX

No compellingreason to runat -threshold ~ ~ 1nb

Precision results from BESIII, Radiative B-factory

X Data at c thresholdCLEO-c won’tBESIII can’t

Learn a lot at (4S)

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 66

-charm Physics Topics-charm Physics TopicsCharm MesonsCharm Mesons– Absolute Branching Absolute Branching

FractionsFractions– CKM PhysicsCKM Physics– Dalitz PlotsDalitz Plots– Rare Decays Rare Decays – Charm MixingCharm Mixing– CP ViolationCP Violation

Charm BaryonsCharm Baryons– cc Absolute Branching Absolute Branching

FractionsFractions– Form FactorsForm Factors

Precision R scanPrecision R scan

CharmoniaCharmonia– Study of J/Study of J/ , , ’, ’, cjcj– Y(4260), Y(4260), (4160), (4160),

(4040)(4040)TauTau– Tau massTau mass– Absolute BFAbsolute BF– Dipole momentsDipole moments– LifetimeLifetime– CPT, CPVCPT, CPV– Lepton universalityLepton universality– Lepton flavor violationLepton flavor violation– mmss,V,VususX

No compellingreason to runat -threshold ~ ~ 1nb

Precision results from BESIII, Radiative B-factory

X Data at c thresholdCLEO-c won’tBESIII can’t

Learn a lot at (4S)

Enormous BESIII J/ samplewill provide some answers &open more questions in QCD

+Flexibility to directly scan

regions of interest: Y(4260)

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 77

-charm Physics Topics-charm Physics TopicsCharm MesonsCharm Mesons– Absolute Branching Absolute Branching

FractionsFractions– CKM PhysicsCKM Physics– Dalitz PlotsDalitz Plots– Rare Decays Rare Decays – Charm MixingCharm Mixing– CP ViolationCP Violation

Charm BaryonsCharm Baryons– cc Absolute Branching Absolute Branching

FractionsFractions– Form FactorsForm Factors

Precision R scanPrecision R scan

CharmoniaCharmonia– Study of J/Study of J/ , , ’, ’, cjcj– Y(4260), Y(4260), (4160), (4160),

(4040)(4040)TauTau– Tau massTau mass– Absolute BFAbsolute BF– Dipole momentsDipole moments– LifetimeLifetime– CPT, CPVCPT, CPV– Lepton universalityLepton universality– Lepton flavor violationLepton flavor violation– mmss,V,VususX

No compellingreason to runat -threshold ~ ~ 1nb

Precision results from BESIII, Radiative B-factory

X Data at c thresholdCLEO-c won’tBESIII can’t

Learn a lot at (4S)

Enormous BESIII J/ samplewill provide some answers &open more questions in QCD

+Flexibility to directly scan

regions of interest: Y(4260)

CKM Physics: CLEO-c will measure/enable1-few % measurement of Vcd, Vcs, Vub, Vcb, Vtd, Vts

BESIII will improve furtherNo Standard Model “hypothesis driven” motivation for further running at charm threshold

CLEO-c/BESIII will obtain “interesting” mixingand rare decay results – so will (Super) B-factory

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 88

-charm Physics Topics-charm Physics TopicsCharm MesonsCharm Mesons– Absolute Branching Absolute Branching

FractionsFractions– CKM PhysicsCKM Physics– Dalitz PlotsDalitz Plots– Rare Decays Rare Decays – Charm MixingCharm Mixing– CP ViolationCP Violation

Charm BaryonsCharm Baryons– cc Absolute Branching Absolute Branching

FractionsFractions– Form FactorsForm Factors

Precision R scanPrecision R scan

CharmoniaCharmonia– Study of J/Study of J/ , , ’, ’, cjcj– Y(4260), Y(4260), (4160), (4160),

(4040)(4040)TauTau– Tau massTau mass– Absolute BFAbsolute BF– Dipole momentsDipole moments– LifetimeLifetime– CPT, CPVCPT, CPV– Lepton universalityLepton universality– Lepton flavor violationLepton flavor violation– mmss,V,VususX

No compellingreason to runat -threshold ~ ~ 1nb

Precision results from BESIII, Radiative B-factory

X Data at c thresholdCLEO-c won’tBESIII can’t

Learn a lot at (4S)

Enormous BESIII J/ samplewill provide some answers &open more questions in QCD

+Flexibility to directly scan

regions of interest: Y(4260)

Results from LHC will motivate searches atSuper B-factory. Results will constrain models

Similary LHC results will motivate searchesat Super charm factory

More importantly connecting (some) precision B Results with LHC results requires precision theory.Super charm factory provides data to test/honerequired theoretical techniques

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 99

What’s in a name?What’s in a name?We have been asked to consider We have been asked to consider – Super Super -charm factory-charm factory– Super B-factory Super B-factory Given cross sections & available Given cross sections & available physics better names arephysics better names are– Super charm factorySuper charm factory– Super Super -B factory -B factory A single machine with energy flexibility A single machine with energy flexibility – Super flavor factory (SFF)Super flavor factory (SFF)

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1010

Energy FlexibilityEnergy FlexibilitySince 2000 CESR has run at 100+ different energies Since 2000 CESR has run at 100+ different energies – scans of scans of (1-3S) resonances and (1-3S) resonances and bb, D, Ds s regionsregions– ““on resonance” on resonance” (1-5S), (1-5S), ’, ’, ’’, 4.17GeV, Y(4260)’’, 4.17GeV, Y(4260)– ““continuum” data near continuum” data near (1-4S), (1-4S), ’, 7-10 GeV’, 7-10 GeV

Energy flexibility reaps scientific fruitEnergy flexibility reaps scientific fruit– CLEO-c 140 scientists, 21 institutionsCLEO-c 140 scientists, 21 institutions– Since 2000 ~130 papers in Phys. Rev. Lett. & Phys. Rev. DSince 2000 ~130 papers in Phys. Rev. Lett. & Phys. Rev. D

Problem: Neither CLEO detector nor CESR machine Problem: Neither CLEO detector nor CESR machine were designed for charm energy runningwere designed for charm energy running– Luminosity is 5x lower than anticipated from energy scalingLuminosity is 5x lower than anticipated from energy scaling– No muon ID at lower energies, Detector not quite optimalNo muon ID at lower energies, Detector not quite optimal

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1111

Choose a single energy e+e- Choose a single energy e+e- machine to accompany LHC machine to accompany LHC First choiceFirst choice

Second choiceSecond choice

Third choiceThird choice

Best choiceBest choice

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1212

Choose a single energy e+e- Choose a single energy e+e- machine to accompany LHC machine to accompany LHC First choiceFirst choice– ILCILCSecond choiceSecond choice

Third choiceThird choice

Best choiceBest choice

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1313

Choose a single energy e+e- Choose a single energy e+e- machine to accompany LHC machine to accompany LHC First choiceFirst choice– ILCILCSecond choiceSecond choice– Super tau-B factorySuper tau-B factoryThird choiceThird choice

Best choiceBest choice

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1414

Choose a single energy e+e- Choose a single energy e+e- machine to accompany LHC machine to accompany LHC First choiceFirst choice– ILCILCSecond choiceSecond choice– Super tau-B factorySuper tau-B factoryThird choiceThird choice– Super charm factorySuper charm factoryBest choiceBest choice

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1515

Choose a single energy e+e- Choose a single energy e+e- machine to accompany LHC machine to accompany LHC First choiceFirst choice– ILCILCSecond choiceSecond choice– Super tau-B factorySuper tau-B factoryThird choiceThird choice– Super charm factorySuper charm factoryBest choice :not a single energy Best choice :not a single energy machinemachine– Super flavor factory (SFF)Super flavor factory (SFF)

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1616

Skeleton Run Plan for SFF Skeleton Run Plan for SFF CLEO-c & BESIII data samples INSUFFICIENT CLEO-c & BESIII data samples INSUFFICIENT to fully exploit LHC + Super to fully exploit LHC + Super -B factory data-B factory dataBeyond Standard Model Studies from CharmBeyond Standard Model Studies from Charm– Precision CKM Physics Precision CKM Physics – Dalitz Plots – for Dalitz Plots – for //33 and more and more– Rare Decays Rare Decays – Charm MixingCharm MixingAll of above point to 1:100 ratio of All of above point to 1:100 ratio of (3770):(3770):(4S) effective integrated luminosity(4S) effective integrated luminosityLuminosity + energy spreadLuminosity + energy spread– ~15% running @ ~15% running @ (3770), ~85% running @ (3770), ~85% running @ (4S) (4S)

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1717

Original QuestionOriginal QuestionWhy do we need a super tau/charm Why do we need a super tau/charm factory?factory?

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1818

First AnswerFirst AnswerWhy do we need a super tau/charm Why do we need a super tau/charm factory?factory?

We do NOT need a super charm We do NOT need a super charm factory INSTEAD of a super factory INSTEAD of a super -B -B factoryfactory

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 1919

Second AnswerSecond AnswerWhy do we need a super tau/charm Why do we need a super tau/charm factory?factory?

We do NOT need a super charm factory We do NOT need a super charm factory INSTEAD of a super INSTEAD of a super -B factory-B factory

It would be beneficial to have some It would be beneficial to have some charm threshold data (1% of luminosity) charm threshold data (1% of luminosity) in ADDITION to b threshold data in ADDITION to b threshold data

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 2020

Final SolutionFinal Solution

Super Flavor Factory

28 Feb – 3 Mar, 200628 Feb – 3 Mar, 2006 Discoveries in Flavour Physics, Frascati, Discoveries in Flavour Physics, Frascati, ItalyItaly 2121

Final SolutionFinal Solution

Energy flexibility for Energy flexibility for both Machine and Detector both Machine and Detector should be included in initial designshould be included in initial design

Super Flavor Factory