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Status and Prospect of sKEKB

Status and Prospect of sKEKB. May 30, 2008 Yutaka Ushiroda (KEK) Flavour as a Window to New Physics at the LHC Focus Week “B@LHC”. Outline. Introduction Accelerator status and prospect Detector status and prospect Political situation Summary. KEK and KEKB. CERN. JAPAN. KEK and KEKB.

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Status and Prospect of sKEKB

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  1. Status and Prospect of sKEKB May 30, 2008 Yutaka Ushiroda (KEK) Flavour as a Window to New Physics at the LHC Focus Week “B@LHC”

  2. Outline • Introduction • Accelerator status and prospect • Detector status and prospect • Political situation • Summary

  3. KEK and KEKB CERN JAPAN

  4. KEK and KEKB Tsukuba Tokyo Mt. Fuji

  5. KEK and KEKB KEK

  6. Mt. Tsukuba KEKB Belle ~1 km in diameter KEK and KEKB 3.5 GeV e+X8.0 GeV e- crossing angle = 11 mrad.

  7. The Luminosity Frontier

  8. Observation of CP violation in B meson system Main results from Belle L>830/fb Evidence for D0 mixing Observation of Bs gfg Observation of direct CP violation in B gp+p- Evidence for B gtn Observation of b g dg Evidence for direct CP violation in B gK+p- Measurements of CP violation in B gfKs, h’Ks etc. DCP in B0gK+p- vs. B+gK+p0 Discovery of X(3872) Observation of B g K(*)ll

  9. M. Nakao @ BPAC/KEK, 2008

  10. SMprediction Ks track p+ p- The decay is almost flavor specific because photon is highly polarized g g B vertex IP profile g BgK*(gKSp0) g TCPV B vertex recon by a KS 535fb-1 NP 10ab-1 AGS [Phys.Rev.Lett. 79, 185 (1997)] AGHS [Phys. Rev. D 71, 076003 (2005)] SM

  11. talk by M. Misiak

  12. β*y = σz = 3 mm Crab cavities will be installed and tested with beam in 2006. SuperKEKB e- 9.4 A e+ 4.1 A The state-of-art ARES copper cavities will be upgraded with higher energy storage ratio to support higher current. The superconducting cavities will be upgraded to absorb more higher-order mode power up to 50 kW. The beam pipes and all vacuum components will be replaced with higher-current-proof design. will reach 8 × 1035 cm-2s-1.

  13. Slide from Y. Ohnishi Machine parameters

  14. Improve Luminosity sKEKB • Increase beam current • Squeeze beam size (a little) KEKB PEPII Brute force, but adiabatic and steady SuperB • Squeeze beam size New sophisticated approach

  15. Improve Gas Mileage Hybrid Plug-in Hybrid TOYOTA Prius Gasoline Car Hydrogen FIAT Panda Hydrogen

  16. Slide from Y. Ohnishi Projected Luminosity (preliminary) operation time : 240 days/year KEK roadmap includes RF/DR (after 3 years shutdown) Integrate luminosity (ab-1) Target for roadmap KEK roadmap RF upgrade Damping Ring Peak luminosity (cm-2s-1) Target for roadmap 3 years shutdown Peak current (A) Year

  17. Beam Background (extrapolation) Prepare against 20x Ideas to reduce background: Neutron shield for KLM Improve vacuum Cu chamber near IR Careful IR design

  18. Against high background (1) Finer segmentation of sensors Large cell Occupancy = 6/12 = 50% Hits overlap Small cell Occupancy = 7/48 = 14.5% Hits separated Hit rate per cell can be reduced

  19. Against high background (2) Finer segmentation in time Long-tailed signals overlap each other t Short signals are separated t Even when we cannot shorten the peaking time, waveform sampling will helpto discriminate two signals t

  20. “effective” backgroundwith new hardware (*) Software efforts needed for CDC We know how to deal with high background

  21. sKEKB: Baseline Design sBelle Belle SVD: 4 lyr g 6 lyr DSSD (option: pixel, striplet) CDC: small cell, long lever arm ACC+TOF g TOP+A-RICH ECL: waveform sampling, pure CsI for end-caps KLM: RPC gScintillator +SiPM (end-caps)

  22. To be improved • Larger radial size of vertex detector to accept more KS • Innermost sensor closer to the IP to improve Dz resolution • More hermetic detector to help reconstruction of invisible modes (w/ n) • Better Particle Identification • Better KL reconstruction • …

  23. End-cap PID (A-RICH)Test beam result March 2008 at KEK Fuji electron beam line pe = 2 GeV/c 6 HAPDs Clear ring image observed ! s ~ 12mrad, Np.e. ~ 4

  24. External Reviews Belle PAC, Feb. 25,26, 2008 http://belle.kek.jp/hot/Review_report-bis.pdf KEKB Review, Nov.-Dec., 2007 KEK Roadmap Review Committee, Mar. 9,10, 2008 and one more Belle review in July by Japanese key figures

  25. Necessary approvals to starta new big project at KEK KEK = an inter-university research institute corporation We’re here!

  26. Tight Schedule Toward Upgrade Open meetings for the proto-collaboration (next Jul. 3,4) Design Decision Detector Study Report TDR

  27. Summary • We plan to upgrade KEKB/Belle in a sure and steady method. • We have ideas to make the accelerator and the detector, and continuing R&Ds. • We will make a budget request to the government soon. • Hopefully, we will start the operation in late 2012 and accumulate 10-50ab-1 by 202x depending on the budget. • Hope you will put this talk not in the ‘Long-term future’ session from the next time.

  28. KEK’s 5 year Roadmap • Official 20 page report released on January 4, 2008 by director A. Suzuki and KEK management • KEKB’s upgrade to 2x1035 /cm2/sec in 3+x years is the central element in particle physics.(Funding limited: Final goal is 8 x 1035 and an integrated luminosity of 50 ab-1) • Will be finalized after recommendations by the Roadmap Review Committee (March 9-10). • Membership: Young Kee Kim, John Ellis, Rolf Heuer, Andrew Hutton, Jon Rosner and reviewers from other fields Super-Belle (and Super KEKB) is an open international project that covers the next two orders of magnitudes at the luminosity frontier. A special opportunity for high impact international collaboration

  29. Three factors to determine the luminosity: Stored current: 1.7 / 1.4 A (e+/ e- KEKB) → 9.4 /4.1 A (SuperKEKB) Beam-beam parameter: 0.059 (KEKB) → >0.24 (SuperKEKB) Lorentz factor Geometrical repipeion factors due to crossing angle and hour-glass effect Classical electron radius Beam size ratio Vertical β at the IP: 6.5/5.9 mm (KEKB) → 3.0/3.0 mm (SuperKEKB) Luminosity: 0.17 ×1035 cm-2s-1 (KEKB) 8×1035 cm-2s-1 (SuperKEKB)

  30. Costs & Effects Preliminary Items are interrelated.

  31. Time schedule is restricted. Baseline is “HIGH current scheme”. Alternative is low beta+low emittance+crab waist scheme

  32. Luminosity upgrade Luminosity gain and upgrade items (preliminary) 3 years shutdown KEK roadmap

  33. Machine parameters

  34. Slide from K. Oide sKEKB: Accelerator Luminosity is funding-limited Assume a construction project starting in 2009 with luminosity in 2012 (i.e. a 3 year accelerator and detector construction shutdown.)

  35. Luminosity [ Gas mileage Hydrogen Hybrid Plug-in Hybrid TOYOTA Prius MAZDA RX8 Girasole = Street2008 FIAT Panda EV Hydrogen

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