super b-factory at kek ruslan chistov (itep) 27 feb.2012 ruslan chistov, seminar at inp troitsk...

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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KEKBTokyo

KEKB:KEKB:HER: 8.0 GeVLER: 3.5 GeVcrossing: 22 mradECMS=M((4S))=0.425



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

5

Tokyo (40 mins by Tsukuba Exps)


6

Tokyo (40 mins by Tsukuba Exps)


B-factories: success story

Acknowledgementin Nobel Prize 2008

B0 tag

_ B0 tag


The background subtracted t distribution and asymmetry

8

Achievements and Legacy of B-factories:


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

X(3872) Z+(4430)

LFV in τ-decays

Selected Highlights

B→τυ

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

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ITEP Contribution to the Physics at Belle (selected topics)


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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ITEP Contribution to the Physics at Belle (selected topics)


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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ITEP Contribution to the Physics at Belle (Observation of charged charmonium-like states Zc1,2)


hadro-charmonium S.Dubinskiy,M.B.Voloshin,0803.2224

B0c1+ K-

Dalitz plot analysis projectionInterpretation:


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


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+

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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Recovery of KEKB Rings from the Earthquake


18

Recovery of Work after the Earthquake


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


Precise measurement of UT is still very important!!!

Belle’2012Belle’2012: 0.667 0.023 0.012

Flavour Physics: next decade


• 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

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


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)

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


Physics reach with 50 ab–1


Belle II sensitivity for LFV covers predictions of many models

Belle II will collect ~9x1010 tau (=50 ab-1)

Need O(100x) more data Next generation B-factories

40 times higher luminosity

1036

KEKB

SuperKEKB+ SuperB

PEP-II



How to increase the luminosity?


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

Detector upgrade


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

Detector upgrade


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


Drift chamber for tracking: Small cells, longer lever arms, faster readoutDeadtime: 1-2ms -> 200 ns

Belle

Belle II



Drift chamber for tracking: Small cells, longer lever arms, faster readout

new PID system:Cherenkov imaging, very fast readout




new PID system:Cherenkov imaging, very fast readout Calorimeter:

New readout withwave form sampling-> 7 times smaller BG




new PID system:Cherenkov imaging, very fast readout Calorimeter:

New readout withwave form sampling

Endcap KL/muon: RPC Scintillator +MPPC



Belle II Construction Schedule


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


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


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


Test module assembling in ITEP

The Belle II Collaboration


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

Luminosity upgrade projection


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Groundbreaking Ceremony 18 Nov. 2011


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!

Backup slides


DEPFET & SVD

46

[

m]

10m20m

BelleBelle II

psin()5/2 [GeV/c]

Mock-up


PID

47

Aerogel

Hamamatsu HAPDQ.E. ~33% (recent good ones)


ECL & KLM

48

Basically ready for mass production(minor revisions because we still have time.)

The first test module of KLM is assembled this Summer


super b-factory at kek ruslan chistov (itep) 27 feb.2012 ruslan chistov, seminar at inp troitsk...

Documents

achievements of b

highlights b slide

legacy of b

inp troitsk slide

s slide

baryonic b decays

observation of b c c

s new x3940 b