Super B-Factory at KEK Ruslan Chistov (ITEP) 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk...
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Transcript of Super B-Factory at KEK Ruslan Chistov (ITEP) 27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk...
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Super B-Factory at KEKRuslan Chistov (ITEP)
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Outline:
1. KEKB and Belle2. Achievements of B-factories3. ITEP group at Belle4. Physics at Super B-Factory5. Super KEKB & Belle II6. ITEP group at Belle II7. Groundbreaking Ceremony
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2
KEKBTokyo
KEKB:KEKB:HER: 8.0 GeVLER: 3.5 GeVcrossing: 22 mradECMS=M((4S))=0.425
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Main target of the Belle experiment
First physics run (June 2, 1999)
1. Discovery of CP violation in B decays2. Precise test of Kobayashi-Maskawa scheme of CPV in the SM3. Search for New Physics beyond the SM
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5
Tokyo (40 mins by Tsukuba Exps)
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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6
Tokyo (40 mins by Tsukuba Exps)
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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B-factories: success story
Acknowledgementin Nobel Prize 2008
B0 tag
_ B0 tag
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
The background subtracted t distribution and asymmetry
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8
Achievements and Legacy of B-factories:
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Electroweak physics: CKM (Vub, Vcb, ), DCPV in BK, BK* ll, BK*,BD,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
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X(3872) Z+(4430)
LFV in τ-decays
Selected Highlights
B→τυ
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BINP, IHEP and ITEP at Belle
1027 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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
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11
ITEP Contribution to the Physics at Belle (selected topics)
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
670 fb-1
X(4630) 8.2
Phys.Rev.Lett.101,172001(2008)
e+e–→Λc+Λc
– γISRDouble charmonium productione+e- J/ cc-bar, cross-section ~10 times larger than predicted by models
c
c0
c(2S)
New X(3940)
B(*)B(*)() decays of (5S)
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12
ITEP Contribution to the Physics at Belle (selected topics)
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
cx(3077)+
cx(2980)+
wrong-sign c+ K+ -
Most accurate mesurement of c mass
First observation of charm strange baryons of a new type First observation of B+(3770)K+
First observation of Bc c
Br ~100 times larger than Br(Bcp)
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13
ITEP Contribution to the Physics at Belle (Observation of charged charmonium-like states Zc1,2)
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
hadro-charmonium S.Dubinskiy,M.B.Voloshin,0803.2224
B0c1+ K-
Dalitz plot analysis projectionInterpretation:
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1427 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
hb and hb’(R.Mizuk (ITEP) in collaboration with BINP people)
Anomalous production of (nS) +-
line shape of Yb
(5S)
reconstructed=
for hb(1P)
for hb(2P)
Mechanism of (5S) hb(nP) +- decay is exotic
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1527 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Charged bottomonium-like states Zb(10610), Zb(10610) (R.Mizuk in collaboration with BINP people)
M(hb), GeV/c2
h b(1
P)
yiel
d /
10M
eV
arXiv:1105.4473
Masses are close to BB* and B*B* thresholds – molecule?
arXiv:1105.4583,
arXiv:1110.2251,submitted to PRL
(5S) (or Yb)Zb+-
Zb(1S)+
Zb(2S)+ Zb(3S)+
Zbhb+
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Last KEKB beam: June 30, 2010
Lpeak = 2.1 x 1034 /cm2/s (world record, 2009)
1627 Feb.2012
Ruslan Chistov, Seminar at INP Troitsk
Ldt > 1000 fb-1
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17
Recovery of KEKB Rings from the Earthquake
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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18
Recovery of Work after the Earthquake
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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Why we need to go further?Success of B-Factories: confirmation of KM mechanism of CPV
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
1927 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Precise measurement of UT is still very important!!!
Belle’2012Belle’2012: 0.667 0.023 0.012
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Flavour Physics: next decade
2027 Feb.2012 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.
CPV in B → J/ψ KS CPV in b → sss, sqq
Direct CPV in B → K*0 γ Indirect CPV in B → KS π0 γ
Time-dependent Bs studies Missing E modes: B → Kυυ, τυ, D(*)τυ
Bs → μ+μ–
Bc, b-baryons
Inclusive b → s μ+μ–, s e+e–
DD mixing and CPV in D
LFV in τ→μγ and others
LHC
b
Su
per-
B a
nd
Bel
leII
Super B factories and LHC are complementary to each other
Search for effect of unknown particles on processes very rare within the SM
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CPV in b → sss penguin decays• In SM expected to have similar sin2ϕ1 as from BJ/ψKS
• Current measurements give:
• NP particle can contribute to the loop and change ΔS value
€
S ≡ sin 2φ1Β → φK s − sin 2φ1
B → J / ψ K s = 0.22 ± 0.17
2127 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Belle-II : the error is expected to go down by a factor of 10
Physics reach with 50 ab–1 (~ 5 years with 8×1035/cm2/s)
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Belle-II (50 ab-1)Belle (1 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)
€
B 0 → K +π −
€
B 0 → K −π +
€
B − → K −π 0
€
B + → K +π 0
2227 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Physics reach with 50 ab–1
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2327 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Belle II sensitivity for LFV covers predictions of many models
Belle II will collect ~9x1010 tau (=50 ab-1)
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Need O(100x) more data Next generation B-factories
40 times higher luminosity
1036
KEKB
SuperKEKB+ SuperB
PEP-II
2427 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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2527 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
How to increase the luminosity?
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2627 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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2727 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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
Critical issues at L = 8 × 1035/cm2/sec
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Detector upgrade
2827 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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.:• Bγγ •B K0
s 0 can be used to detect right-handed current (faster ECL)• Capable of observing rare “missing energy modes” such as B-bar, B, BK-bar with B-tags. Hermiticity is critical. (KLM)
We need to We need to
+ 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
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Detector upgrade
2927 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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Detector upgradeVertex detector: 4lyr. Si strip 2lyr. pixel(DEPFET) +4lyr. Si strip
8/23/2011 30T.Aushev (ITEP), Lomonosov conf.27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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Detector upgradeVertex detector: 4lyr. Si strip 2lyr. pixel(DEPFET) +4lyr. Si strip
Drift chamber for tracking: Small cells, longer lever arms, faster readoutDeadtime: 1-2ms -> 200 ns
Belle
Belle II
8/23/2011 31T.Aushev (ITEP), Lomonosov conf.27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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Detector upgradeVertex detector: 4lyr. Si strip 2lyr. pixel(DEPFET) +4lyr. Si strip
Drift chamber for tracking: Small cells, longer lever arms, faster readout
new PID system:Cherenkov imaging, very fast readout
8/23/2011 32T.Aushev (ITEP), Lomonosov conf.27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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Detector upgradeVertex detector: 4lyr. Si strip 2lyr. pixel(DEPFET) +4lyr. Si strip
Drift chamber for tracking: Small cells, longer lever arms, faster readout
new PID system:Cherenkov imaging, very fast readout Calorimeter:
New readout withwave form sampling-> 7 times smaller BG
8/23/2011 33T.Aushev (ITEP), Lomonosov conf.27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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Detector upgradeVertex detector: 4lyr. Si strip 2lyr. pixel(DEPFET) +4lyr. Si strip
Drift chamber for tracking: Small cells, longer lever arms, faster readout
new PID system:Cherenkov imaging, very fast readout Calorimeter:
New readout withwave form sampling
Endcap KL/muon: RPC Scintillator +MPPC
8/23/2011 34T.Aushev (ITEP), Lomonosov conf.27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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3527 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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3627 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Belle II Construction Schedule
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3727 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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
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3827 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
ITEP group in Belle II■ 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
EKLM layout
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3927 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
ITEP group in Belle II Module-0 strip tests 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:
near end
far end Lstrip<2m
far end Lstrip>2m
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4027 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Test module assembling in ITEP
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The Belle II Collaboration
4127 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
15 countries, 56 institutions,400 collaborators
( ~150 from Europe)
• ~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.
construction started in 2010
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Luminosity upgrade projection
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Groundbreaking Ceremony 18 Nov. 2011
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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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
4427 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
Thanks for your kind attention!
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Backup slides
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DEPFET & SVD
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[
m]
10m20m
BelleBelle II
psin()5/2 [GeV/c]
Mock-up
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PID
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Aerogel
Hamamatsu HAPDQ.E. ~33% (recent good ones)
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk
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ECL & KLM
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Basically ready for mass production(minor revisions because we still have time.)
The first test module of KLM is assembled this Summer
27 Feb.2012 Ruslan Chistov, Seminar at INP Troitsk