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Super B-Factory at KEK

Super B-Factory at KEK. Ruslan Chistov (ITEP). Outline:. KEKB and Belle Achievements of B-factories ITEP group at Belle Physics at Super B-Factory Super KEKB & Belle II ITEP group at Belle II Groundbreaking Ceremony. KEKB: HER: 8.0 GeV LER: 3.5 GeV crossing: 22 mrad

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Super B-Factory at KEK

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  1. Ruslan Chistov, Seminar at INP Troitsk Super B-Factory at KEK RuslanChistov (ITEP) Outline: KEKB and Belle Achievements of B-factories ITEP group at Belle Physics at Super B-Factory Super KEKB & Belle II ITEP group at Belle II Groundbreaking Ceremony

  2. Ruslan Chistov, Seminar at INP Troitsk KEKB: HER: 8.0 GeV LER: 3.5 GeV crossing: 22 mrad ECMS=M(U(4S)) bg=0.425 KEKB Tokyo 2

  3. Ruslan Chistov, Seminar at INP Troitsk

  4. Ruslan Chistov, Seminar at INP Troitsk Main target of the Belle experiment Discovery of CP violation in B decays Precise test of Kobayashi-Maskawa scheme of CPV in the SM Search for New Physics beyond the SM First physics run (June 2, 1999)

  5. Ruslan Chistov, Seminar at INP Troitsk Tokyo (40 mins by Tsukuba Exps) 5

  6. Ruslan Chistov, Seminar at INP Troitsk Tokyo (40 mins by Tsukuba Exps) 6

  7. Ruslan Chistov, Seminar at INP Troitsk _ B0 tag B0 tag B-factories: success story Acknowledgement in Nobel Prize 2008 The background subtracted t distribution and asymmetry

  8. Ruslan Chistov, Seminar at INP Troitsk Achievements and Legacy of B-factories: Electroweak physics: CKM (Vub, Vcb, ), DCPV in BK, BK* ll, BK*,BD,B • QCD: - X(3872)J/+-(most cited Belle paper, 638) and other XY states which do not match into available conventional charmonium slots, charged quarkonium-like states Z(4430)+’+, Z1,2+c1+, Zb1,2+  + (1S/2S/3S) / hb/hb’ • new unexpected charm meson • DsJ (2317/2460)+Ds+0 and baryon c(2980/3080)+,0 c+ K and c(2880/2940)+D0p states • new unexpected B decay modes • new phenomena: threshold peaking in baryon-antibaryon mass in many baryonic B decays and double charmonium production Charm Physcis: D0-D0 mixing, Double Cabibbo-suppressed D0 and D+(s) decays -physcis: search for LFV In total (feb2012) - 315publ’s. belle.kek.jp/bdocs/b_journal.html 8

  9. X(3872) Selected Highlights Z+(4430) B→τυ LFV in τ-decays

  10. Ruslan Chistov, Seminar at INP Troitsk BINP, IHEP and ITEP at Belle BINP - from the very beginning in Belle, 16 people, largest contribution to ECAL maintenance and ~50% construction, ~26 papers (CPV, rare B decays) IHEP – from 2004, 3 people, 5 papers ((4S)(1S)+-) ITEP - from 1999 , 10 people, 38 papers 10

  11. Phys.Rev.Lett.101,172001(2008) e+e–→Λc+Λc–γISR X(4630) 8.2 670 fb-1 ITEP Contribution to the Physics at Belle (selected topics) Double charmonium production e+e-  J/ cc-bar, cross-section ~10 times larger than predicted by models New X(3940) c(2S) c0 c B(*)B(*)() decays of (5S) 11 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  12. ITEP Contribution to the Physics at Belle (selected topics) First observation of charm strange baryons of a new type First observation of B+(3770)K+ cx(3077)+ cx(2980)+ First observation of Bc c Br ~100 times larger than Br(Bcp) wrong-sign c+ K+ - Most accurate mesurement of c mass 12 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  13. ITEP Contribution to the Physics at Belle (Observation of charged charmonium-like states Zc1,2) B0c1+ K- Dalitz plot analysis projection Interpretation: hadro-charmonium S.Dubinskiy,M.B.Voloshin,0803.2224 13 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  14. hb and hb’ (R.Mizuk (ITEP) in collaboration with BINP people) reconstructed line shape of Yb Anomalous production of (nS)+- (5S) = for hb(1P) for hb(2P) • Mechanism of • (5S)  hb(nP) +- decay is exotic 14 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  15. arXiv:1105.4583, arXiv:1110.2251, submitted to PRL hb(1P) yield / 10MeV M(hb), GeV/c2 Charged bottomonium-like states Zb(10610), Zb(10610) (R.Mizuk in collaboration with BINP people) (5S) (or Yb)Zb+- Zb(2S)+ Zb(3S)+ Zb(1S)+ Zbhb+ Masses are close to BB* and B*B* thresholds – molecule? arXiv:1105.4473 15 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  16. Ruslan Chistov, Seminar at INP Troitsk Last KEKB beam: June 30, 2010 Ldt > 1000 fb-1 Lpeak = 2.1 x 1034 /cm2/s (world record, 2009) 16

  17. Recovery of KEKB Rings from the Earthquake Ruslan Chistov, Seminar at INP Troitsk 17

  18. Recovery of Work after the Earthquake 18 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  19. Why we need to go further? Ruslan Chistov, Seminar at INP Troitsk Success of B-Factories: confirmation of KM mechanism of CPV Belle’2012 Belle’2012: 0.667 0.023 0.012 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 Precise measurement of UT is still very important!!! 19

  20. Flavour Physics: next decade Ruslan Chistov, Seminar at INP Troitsk • We believe that Physics beyond the SM must exist. New Physics is required to identify Dark Matter, to add CP violation for cosmology, to cut off UV divergencies… • If the LHC finds New Physics at the TeV scale, • its flavor structure must be examined experimentally. TeV-particles should reveal in B, D and tau-decays. A super B factory is the best tool for this purpose. • If the LHC finds nothing but a SM-like Higgs, • searching for deviations from the SM in flavour physics will be almost the last chance to find New Physics in the next decade. Alternatively, even the ULs constrain NP at energy scales inaccessible to energy frontier experiments. Search for effect of unknown particles on processes very rare within the SM LHCb Super-B and BelleII Super B factories and LHC are complementary to each other 20

  21. Physics reach with 50 ab–1 (~ 5 years with 8×1035/cm2/s) Ruslan Chistov, Seminar at INP Troitsk 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 Belle-II : the error is expected to go downby a factor of 10 21

  22. Ruslan Chistov, Seminar at INP Troitsk Belle (1 ab-1) Belle-II (50 ab-1) Physics reach with 50 ab–1 Puzzling DCPV in B→Kπ • DCPV from Tree <-> Penguin interference • ΔA≈0 in SM • NP (EW penguins) can change it • Model independent sume rule to test SM Belle, Nature 452, 332 (2008) 22

  23. Ruslan Chistov, Seminar at INP Troitsk Belle II sensitivity for LFV covers predictions of many models Belle II will collect ~9x1010tau (=50 ab-1) 23

  24. Ruslan Chistov, Seminar at INP Troitsk Need O(100x) more data Next generationB-factories SuperKEKB+ SuperB 1036 40 times higher luminosity KEKB PEP-II 24

  25. Ruslan Chistov, Seminar at INP Troitsk How to increase the luminosity? 25

  26. Ruslan Chistov, Seminar at INP Troitsk 26

  27. Ruslan Chistov, Seminar at INP Troitsk Critical issues at L = 8 × 1035/cm2/sec BELLE-II Higher background radiation damage and occupancies fake hits and pile-up noise in the ECL • Higher event rate • higher rate trigger, • DAQ and computing 27

  28. Detector upgrade Ruslan Chistov, Seminar at INP Troitsk We need to • Improve performance • try better PID options (new particle identifier) • low p μ identification for EW penguin b → sμμ efficiency (KLM) • In contrust to LHCb superb neutral detection capabilities • E.g.: • Bγγ • B  K0s 0  can be used to detect right-handed current (faster ECL) • Capable of observing rare “missing energy modes” such as • B-bar, B, BK-bar with B-tags. Hermiticity is critical. (KLM) + Tracking detector and SVD with high background tolerance ! (replace inner layers of the vertex detector with a pixel detector, Replace inner part of the central tracker with a silicon strip detector) + New dead time free pipelined readout ! + High speed computing systems ! More details 28

  29. Ruslan Chistov, Seminar at INP Troitsk Detector upgrade 29

  30. Ruslan Chistov, Seminar at INP Troitsk Vertex detector: 4lyr. Si strip  2lyr. pixel(DEPFET) +4lyr. Si strip Detector upgrade 8/23/2011 T.Aushev (ITEP), Lomonosov conf. 30

  31. Ruslan Chistov, Seminar at INP Troitsk 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 Detector upgrade 8/23/2011 T.Aushev (ITEP), Lomonosov conf. 31

  32. Ruslan Chistov, Seminar at INP Troitsk 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 Detector upgrade 8/23/2011 T.Aushev (ITEP), Lomonosov conf. 32

  33. Ruslan Chistov, Seminar at INP Troitsk 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 Calorimeter: New readout with wave form sampling -> 7 times smaller BG Detector upgrade 8/23/2011 T.Aushev (ITEP), Lomonosov conf. 33

  34. Ruslan Chistov, Seminar at INP Troitsk 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 Endcap KL/muon: RPC Scintillator +MPPC Calorimeter: New readout with wave form sampling Detector upgrade 8/23/2011 T.Aushev (ITEP), Lomonosov conf. 34

  35. 35 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  36. Ruslan Chistov, Seminar at INP Troitsk Belle II Construction Schedule 36

  37. ITEP group in Belle II (EKLM) • RPC-based KLM demonstrated nice performance at Belle • (eff.endcap>99%, barrel~99%, stable operation, low bg) • With SuperKEKB luminosity because of large RPC dead time endcap KLM efficiency drops to 0 Chosen option Scintillator based detector with WLS readout Fast photodector: Si photo diode in Geiger mode (Hamamatsu MPPC) Independent operation of x-y layers 37 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  38. ITEP group in Belle II EKLM layout • 75 strips (4 cm width)/1 layer/sector = 150 strips/superlayer • 16800 strips for F&B endcap KLM • the longest strip 2.8 m; the shortest 0.6 m • WLS (blue  green) fiber in each strip (Y11 MC D=1.2mm) • SiPM at one fiber end (at outer sector radius) • mirrored far fiber end 38 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  39. ITEP group in Belle II Module-0 strip tests near end • Average light yields for both near and far strip ends were measured with cosmic muons (corrected for SiPM x-talk and non-perpendicular incidence) • Good results at near end • Good light yield at the far end for short and middle-length strips, acceptable for the most long strips • However, several bad strips were found, seems due to the production defects: far end Lstrip<2m far end Lstrip>2m 39 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  40. Test module assembling in ITEP 40 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  41. Ruslan Chistov, Seminar at INP Troitsk The Belle II Collaboration 15 countries, 56 institutions, 400 collaborators ( ~150 from Europe) construction started in 2010 • ~100 MUS for machine -- Very Advanced Research Support Program (FY2010-2012) • Full approval by the Japanese government in December 2010; the project is in the JFY2011 budget as approved by the Japanese Diet end of March 2011 • Most of non-Japanese funding agencies have also already allocated sizable funds for the upgrade of the detector. 41

  42. Luminosity upgrade projection 42 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  43. Groundbreaking Ceremony 18 Nov. 2011 43 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk

  44. Ruslan Chistov, Seminar at INP Troitsk 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 Dec.2015 Thanks for your kind attention! 44

  45. Ruslan Chistov, Seminar at INP Troitsk Backup slides 45

  46. Ruslan Chistov, Seminar at INP Troitsk DEPFET & SVD [m] Belle Belle II 20m 10m psin()5/2[GeV/c] Mock-up 46

  47. Ruslan Chistov, Seminar at INP Troitsk PID Aerogel Hamamatsu HAPD Q.E. ~33% (recent good ones) 47

  48. Ruslan Chistov, Seminar at INP Troitsk ECL & KLM Basically ready for mass production (minor revisions because we still have time.) The first test module of KLM is assembled this Summer 48

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