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SuperKEKB/BelleII

SuperKEKB/BelleII. Paoti Chang National Taiwan University 2nd Workshop on Beyond 3 Generation Standard Model. SuperKEKB Looks Promising. Belle II. LER e – 2.1 A. HER e + 3.7 A. More RF / modify RF systems. Low emittance gun. Low emittance positrons.

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SuperKEKB/BelleII

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  1. SuperKEKB/BelleII Paoti Chang National Taiwan University 2nd Workshop on Beyond 3 Generation Standard Model SuperKEKB/BelleII

  2. SuperKEKB Looks Promising SuperKEKB/BelleII

  3. Belle II LER e– 2.1 A HER e+ 3.7 A More RF / modify RF systems. Low emittance gun Low emittance positrons KEKB upgrade → SuperKEKB(nano-beam) Two separate focusing quads/each 2 beams closer to IP; Superconducting / permanent magnets Replace long dipoles with shorter ones in HER. New positron target / capture section Redesign the HER arcs to reduce the emittance. Target Luminosity: 8.0x1035 /cm2/s SuperKEKB/BelleII

  4. Belle II Detector SuperKEKB/BelleII

  5. Shut down Belle for upgrade

  6. SuperKEKB/BelleII

  7. Task for This Forum • How can super B factory pint down parameters of 4th generation assuming t’ and b’ are discovered at the LHC? • DA(Kp), AFB of K*ll, D-D mixing, … SuperKEKB/BelleII

  8. Vub and Vcb • Estimation given by the two groups • Theoretically limited • Tension between Vub inclusive and • exclusive See H. Lacker’s talk SuperKEKB/BelleII

  9. UT angle f1/b H. Lacker SuperKEKB/BelleII

  10. UT angle f2/a • Is it really an independent measurement without assuming the close triangle? • Isospin violation: O(1.5o) SuperKEKB/BelleII

  11. UT angle f3/g SuperKEKB/BelleII

  12. Other channels SuperKEKB/BelleII

  13. Kp Puzzle H. Lacker, M. Nakao 5 ab-1 50 ab-1 A( K0p0) 0.072 0.042 SuperKEKB/BelleII

  14. D mixing SuperKEKB SuperKEKB/BelleII

  15. Bs Physics SuperB SuperKEKB/BelleII

  16. LFV in t decays SuperKEKB/BelleII

  17. Back Up SuperKEKB/BelleII

  18. Comparison of parameters Low Energy / High Energy ring / ring Also consider smaller boost: EHER/ELER KEKB 8GeV/3.5GeV  SuperKEKB 7GeV/4GeV easier for accelerator people; not very critical for physics SuperKEKB/BelleII

  19. SuperKEKB/BelleII

  20. Critical issues at L = 8 × 1035/cm2/sec CsI(Tl) 16X0 → pure CsI (endcap)‏ SC solenoid 1.5T Aerogel Cherenkov counter + TOF counter → “TOP” + Aerogel RICH μ/KL detection 14/15 lyr. RPC+Fe → scintillator (endcap) CDC: Tracking + dE/dx →small cell + He/C2H6 remove inner lyrs. New DAQ and computing systems Si vtx. det. 4 lyr. DSSD → 2 DEPFET pixel lyrs. + 4 lyr. DSSD Detector upgrade • Higher event rate • higher rate trigger, DAQ and computing • Higher background • radiation damage and occupancies • fake hits and pile-up noise in the ECL + • Improve performance • try better PID options • low p μ identification for b → sμμ efficiency • hermeticity → missing E “reconstruction” BELLE BELLE-II

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