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Status & Prospects of SuperKEKB & Belle-II

Status & Prospects of SuperKEKB & Belle-II. Tagir Aushev (ITEP) for the Belle-II Collaboration. B 0 tag. _. B 0 tag. B-factory experiments achievements. Measurements of CKM matrix elements and angles of the unitarity triangle Observation of direct CP violation in B decays

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Status & Prospects of SuperKEKB & Belle-II

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  1. Status & Prospects of SuperKEKB & Belle-II Tagir Aushev (ITEP) for the Belle-II Collaboration

  2. B0 tag _ B0 tag B-factory experiments achievements • Measurements of CKM matrix elements and angles of the unitarity triangle • Observation of direct CP violation in B decays • Measurements of rare decays (e.g., Bτν, Dτν) • bs transitions: probe for new sources of CPV and constraints from the bsγbranching fraction • Forward-backward asymmetry in bsllhas become a powerfull tool to search for physics beyond SM. • Observation of new hadrons (X(3872) & etc.) • Observation of D mixing • Searches for rare τdecays Acknowledgement in Nobel Prize 2008 Presented in details in P.Chang’s talk T.Aushev (ITEP), Lomonosov conf.

  3. What we started from: KEKB & Belle Tokyo (40 mins by Tsukuba Exps) LER HER Belle T.Aushev (ITEP), Lomonosov conf.

  4. Last KEKB beam abort: June 30, 2010 First physics run on June 2, 1999 Last physics run on June 30, 2010 Lpeak = 2.1x1034/cm2/s Lint > 1ab-1 T.Aushev (ITEP), Lomonosov conf.

  5. Deconstructing to start Belle II upgrade November 2010: extracted SVD Dec. 9, 2010: Belle Detector Roll-out Jan. 2011: End-caps, CDC, B-ACC, TOF extraction Ready for new construction to start… T.Aushev (ITEP), Lomonosov conf.

  6. Why we need to go further? • Success of B-Factories: confirmation of KM mechanism of CPV • Standard Model workswell in this flavor sector • Still room for corrections from New Physics at O(10%) • Hints of NP: tensions between results from B-Factories • Explore these hints with higher precision In CKM global fit: 2.4σ discrepancy between direct and indirect measurements of sin2φ1 – BR(B→τν) experimental measurements CKM fit w/o these measurements T.Aushev (ITEP), Lomonosov conf.

  7. Physics goals of SuperKEKB • Approach complementary to hadron colliders • LHC: energy frontier Direct searches NP up to O(1TeV) • SuperKEKB: rare/precision frontier Search for indirect NP effects • up to O(1TeV) if Minimal Flavour Violation assumed • up to O(100TeV) if Flavour Violation couplings enhanced • Observe NP→ overconstrain SM and BSM parameters→characterize NP • New Physics sensitive processes: • b→sss penguins • B→τν, B→ Dτν • DCPV in B→Kπ • AFB in B→K*l+l- • CPV in D decays • LFV in τ decays • (Well described in A.Bevan’s talk for SuperB) T.Aushev (ITEP), Lomonosov conf.

  8. CPV in b → sss penguin decays • In SM expected to have similar sin2ϕ1 as from BJ/ψKS • Current measurements give: • NP particle can contribute to the loop and change ΔS value • With Belle-II the error is expected • to go down by factor of 10 T.Aushev (ITEP), Lomonosov conf.

  9. Puzzling DCPV in B→Kπ • DCPV from Tree <-> Penguin interference • ΔA≈0 in SM • NP (or hadronic effects) can change it • Model independent sume rule to test SM Belle, Nature 452, 332 (2008) Belle (1 ab-1) Belle-II (50 ab-1) T.Aushev (ITEP), Lomonosov conf.

  10. Belle-II & LHCb are complementary T.Aushev (ITEP), Lomonosov conf.

  11. Need O(100x) more data Next generationB-factories SuperKEKB+ SuperB 1036 40 times higher luminosity KEKB PEP-II T.Aushev (ITEP), Lomonosov conf.

  12. Colliding bunches e+ 4 GeV 3.6 A Belle II New IR e- 7 GeV 2.6 A New superconducting /permanent final focusing quads near the IP SuperKEKB New beam pipe & bellows Replace short dipoles with longer ones (LER) Add / modify RF systems for higher beam current Inject low emittance positrons Positron source New positron target / capture section Redesign the lattices of both rings to reduce the emittance Damping ring TiN-coated beam pipe with antechambers Low emittance gun Inject low emittance electrons x 40 Increase in Luminosity T.Aushev (ITEP), Lomonosov conf.

  13. Accelerator upgrade At SuperKEKB, we increase the luminosity based on “Nano-Beam” scheme (originally proposed for SuperB by P. Raimondi) • Vertical β function at IP: 5.9 → 0.27/0.30 mm (x20) • Beam current: 1.7/1.4 → 3.6/2.6 A (x2)  L= 2x1034  8x1035 cm-2s-1 (x40) Luminosity Gain T.Aushev (ITEP), Lomonosov conf.

  14. Detector upgrade T.Aushev (ITEP), Lomonosov conf.

  15. Detector upgrade Vertex detector: 4lyr. Si strip  2lyr. pixel(DEPFET) +4lyr. Si strip T.Aushev (ITEP), Lomonosov conf.

  16. Detector upgrade Drift chamber for tracking: Small cells, longer lever arms, faster readout Deadtime: 1-2ms -> 200 ns Vertex detector: 4lyr. Si strip  2lyr. pixel(DEPFET) +4lyr. Si strip Belle Belle II T.Aushev (ITEP), Lomonosov conf.

  17. Detector upgrade Drift chamber for tracking: Small cells, longer lever arms, faster readout Vertex detector: 4lyr. Si strip  2lyr. pixel(DEPFET) +4lyr. Si strip new PID system: Cherenkov imaging, very fast readout T.Aushev (ITEP), Lomonosov conf.

  18. Detector upgrade Drift chamber for tracking: Small cells, longer lever arms, faster readout Vertex detector: 4lyr. Si strip  2lyr. pixel(DEPFET) +4lyr. Si strip Calorimeter: New readout with wave form sampling -> 7 times smaller BG new PID system: Cherenkov imaging, very fast readout T.Aushev (ITEP), Lomonosov conf.

  19. Detector upgrade Drift chamber for tracking: Small cells, longer lever arms, faster readout Vertex detector: 4lyr. Si strip  2lyr. pixel(DEPFET) +4lyr. Si strip Calorimeter: New readout with wave form sampling new PID system: Cherenkov imaging, very fast readout Endcap KL/muon: RPC Scintillator +MPPC T.Aushev (ITEP), Lomonosov conf.

  20. DEPFET & SVD Mock-up s[mm] Belle BelleII 20mm 10mm pbsin(q)5/2[GeV/c] T.Aushev (ITEP), Lomonosov conf.

  21. PID Aerogel Hamamatsu HAPD Q.E. ~33% (recent good ones) T.Aushev (ITEP), Lomonosov conf.

  22. ECL & KLM Basically ready for mass production (minor revisions because we still have time.) The first test module of KLM is assembled this Summer T.Aushev (ITEP), Lomonosov conf.

  23. The Belle II Collaboration more than 300 members from 56 institutes from 15 countries T.Aushev (ITEP), Lomonosov conf.

  24. Luminosity upgrade projection Milestone of SuperKEKB We will reach 50 ab-1 in 2020~2021. 9 month/year 20 days/month Integrated Luminosity (ab-1) Commissioning starts mid of 2014 Peak Luminosity (cm-2s-1) Shutdown for upgrade Year T.Aushev (ITEP), Lomonosov conf.

  25. Summary • It was a great era of Belle • Many good results were obtained • Now the preparation for Belle-II experiment is actively ongoing • SuperKEKB & Belle-II are constructing now • The target is 40 times higher luminosity • The start of SuperKEKB/Belle-II is in 2014 T.Aushev (ITEP), Lomonosov conf.

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