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Why do we need a super tau/charm factory?

Why do we need a super tau/charm factory?. David Asner Carleton University. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons L c Absolute Branching Fractions Form Factors Precision R scan. Charmonia

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Why do we need a super tau/charm factory?

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  1. Why do we need a super tau/charm factory? David Asner Carleton University Discoveries in Flavour Physics Frascati, Italy

  2. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons Lc Absolute Branching Fractions Form Factors Precision R scan Charmonia Study of J/ , ’, ccj Y(4260), (4160), (4040) Tau Tau mass Absolute BF Dipole moments Lifetime CPT, CPV Lepton universality Lepton flavor violation ms,Vus t-charm Physics Topics Discoveries in Flavour Physics, Frascati, Italy

  3. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons Lc Absolute Branching Fractions Form Factors Precision R scan Charmonia Study of J/ , ’, ccj Y(4260), (4160), (4040) Tau Tau mass Absolute BF Dipole moments Lifetime CPT, CPV Lepton universality Lepton flavor violation ms,Vus t-charm Physics Topics No compelling reason to run at t-threshold stt ~ s ~ 1nb X Discoveries in Flavour Physics, Frascati, Italy

  4. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons Lc Absolute Branching Fractions Form Factors Precision R scan Charmonia Study of J/ , ’, ccj Y(4260), (4160), (4040) Tau Tau mass Absolute BF Dipole moments Lifetime CPT, CPV Lepton universality Lepton flavor violation ms,Vus t-charm Physics Topics No compelling reason to run at t-threshold stt ~ s ~ 1nb X Precision results from BESIII, Radiative B-factory Discoveries in Flavour Physics, Frascati, Italy

  5. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons Lc Absolute Branching Fractions Form Factors Precision R scan Charmonia Study of J/ , ’, ccj Y(4260), (4160), (4040) Tau Tau mass Absolute BF Dipole moments Lifetime CPT, CPV Lepton universality Lepton flavor violation ms,Vus t-charm Physics Topics No compelling reason to run at t-threshold stt ~ s ~ 1nb X • Data at Lc threshold • CLEO-c won’t • BESIII can’t • Learn a lot at (4S) X Precision results from BESIII, Radiative B-factory Discoveries in Flavour Physics, Frascati, Italy

  6. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons Lc Absolute Branching Fractions Form Factors Precision R scan Charmonia Study of J/ , ’, ccj Y(4260), (4160), (4040) Tau Tau mass Absolute BF Dipole moments Lifetime CPT, CPV Lepton universality Lepton flavor violation ms,Vus t-charm Physics Topics Enormous BESIII J/ sample will provide some answers & open more questions in QCD + Flexibility to directly scan regions of interest: Y(4260) No compelling reason to run at t-threshold stt ~ s ~ 1nb X • Data at Lc threshold • CLEO-c won’t • BESIII can’t • Learn a lot at (4S) X Precision results from BESIII, Radiative B-factory Discoveries in Flavour Physics, Frascati, Italy

  7. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons Lc Absolute Branching Fractions Form Factors Precision R scan Charmonia Study of J/ , ’, ccj Y(4260), (4160), (4040) Tau Tau mass Absolute BF Dipole moments Lifetime CPT, CPV Lepton universality Lepton flavor violation ms,Vus t-charm Physics Topics Enormous BESIII J/ sample will provide some answers & open more questions in QCD + Flexibility to directly scan regions of interest: Y(4260) CKM Physics: CLEO-c will measure/enable 1-few % measurement of Vcd, Vcs, Vub, Vcb, Vtd, Vts BESIII will improve further No Standard Model “hypothesis driven” motivation for further running at charm threshold CLEO-c/BESIII will obtain “interesting” mixing and rare decay results – so will (Super) B-factory No compelling reason to run at t-threshold stt ~ s ~ 1nb X • Data at Lc threshold • CLEO-c won’t • BESIII can’t • Learn a lot at (4S) X Precision results from BESIII, Radiative B-factory Discoveries in Flavour Physics, Frascati, Italy

  8. Charm Mesons Absolute Branching Fractions CKM Physics Dalitz Plots Rare Decays Charm Mixing CP Violation Charm Baryons Lc Absolute Branching Fractions Form Factors Precision R scan Charmonia Study of J/ , ’, ccj Y(4260), (4160), (4040) Tau Tau mass Absolute BF Dipole moments Lifetime CPT, CPV Lepton universality Lepton flavor violation ms,Vus t-charm Physics Topics Results from LHC will motivate searches at Super B-factory. Results will constrain models Similary LHC results will motivate searches at Super charm factory More importantly connecting (some) precision B Results with LHC results requires precision theory. Super charm factory provides data to test/hone required theoretical techniques Enormous BESIII J/ sample will provide some answers & open more questions in QCD + Flexibility to directly scan regions of interest: Y(4260) No compelling reason to run at t-threshold stt ~ s ~ 1nb X • Data at Lc threshold • CLEO-c won’t • BESIII can’t • Learn a lot at (4S) X Precision results from BESIII, Radiative B-factory Discoveries in Flavour Physics, Frascati, Italy

  9. What’s in a name? • We have been asked to consider • Super t-charm factory • Super B-factory • Given cross sections & available physics better names are • Super charm factory • Super t-B factory • A single machine with energy flexibility • Super flavor factory (SFF) Discoveries in Flavour Physics, Frascati, Italy

  10. Energy Flexibility • Since 2000 CESR has run at 100+ different energies • scans of (1-3S) resonances and Lb, Ds regions • “on resonance” (1-5S), ’, ’’, 4.17GeV, Y(4260) • “continuum” data near (1-4S), ’, 7-10 GeV • Energy flexibility reaps scientific fruit • CLEO-c 140 scientists, 21 institutions • Since 2000 ~130 papers in Phys. Rev. Lett. & Phys. Rev. D • Problem: Neither CLEO detector nor CESR machine were designed for charm energy running • Luminosity is 5x lower than anticipated from energy scaling • No muon ID at lower energies, Detector not quite optimal Discoveries in Flavour Physics, Frascati, Italy

  11. Choose a single energy e+e- machine to accompany LHC • First choice • Second choice • Third choice • Best choice Discoveries in Flavour Physics, Frascati, Italy

  12. Choose a single energy e+e- machine to accompany LHC • First choice • ILC • Second choice • Third choice • Best choice Discoveries in Flavour Physics, Frascati, Italy

  13. Choose a single energy e+e- machine to accompany LHC • First choice • ILC • Second choice • Super tau-B factory • Third choice • Best choice Discoveries in Flavour Physics, Frascati, Italy

  14. Choose a single energy e+e- machine to accompany LHC • First choice • ILC • Second choice • Super tau-B factory • Third choice • Super charm factory • Best choice Discoveries in Flavour Physics, Frascati, Italy

  15. Choose a single energy e+e- machine to accompany LHC • First choice • ILC • Second choice • Super tau-B factory • Third choice • Super charm factory • Best choice :not a single energy machine • Super flavor factory (SFF) Discoveries in Flavour Physics, Frascati, Italy

  16. Skeleton Run Plan for SFF • CLEO-c & BESIII data samples INSUFFICIENT to fully exploit LHC + Super t-B factory data • Beyond Standard Model Studies from Charm • Precision CKM Physics • Dalitz Plots – for g/f3 and more • Rare Decays • Charm Mixing • All of above point to 1:100 ratio of (3770):(4S) effective integrated luminosity • Luminosity + energy spread • ~15% running @ (3770), ~85% running @ (4S) Discoveries in Flavour Physics, Frascati, Italy

  17. Original Question • Why do we need a super tau/charm factory? Discoveries in Flavour Physics, Frascati, Italy

  18. First Answer • Why do we need a super tau/charm factory? We do NOT need a super charm factory INSTEAD of a super t-B factory Discoveries in Flavour Physics, Frascati, Italy

  19. Second Answer • Why do we need a super tau/charm factory? We do NOT need a super charm factory INSTEAD of a super t-B factory It would be beneficial to have some charm threshold data (1% of luminosity) in ADDITION to b threshold data Discoveries in Flavour Physics, Frascati, Italy

  20. Final Solution Super Flavor Factory Discoveries in Flavour Physics, Frascati, Italy

  21. Final Solution Energy flexibility for both Machine and Detector should be included in initial design Super Flavor Factory Discoveries in Flavour Physics, Frascati, Italy

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