The SuperB project

Giovanni BatignaniDipartimento di Fisica e INFN Pisa

8 luglio 2011 1

Outline0

0. Introduction0

1. A bit of Physics(update on physics with polarization)

1(update on physics with polarization)

2. ( Detector ) 22. ( Detector )

3. The Machine 3

4. Site, Laboratory and Progress Report4

8 luglio 2011 2

Premessa: la storia si ripete? • W (80 GeV)

0

• W (80 GeV)• Hint sperimentale: decadimenti nucleari e del neutrone, dovuti a W virtuali • Prima produzione di W reali : al SpS • misure degli accoppiamenti dei W: a LEP, nei decadimenti deboli di mesoni pesanti, nei neutrini, ...

Q k h (1 3 G V)• Quark charm (1.3 GeV)• Hint sperimentale: non esistono correnti deboli neutre che violano la stranezza• Prima produzione di charm reali : ‘simultaneamente’ in interazione adroniche ed e+e-• misure degli accoppiamenti del charm: a LEP, nelle oscillazioni e decadimenti (penguin) di mesoni pesanti, ....

• Quark Top (172 GeV)• Hint sperimentale (....) : violazione di CP nel K o altri tipi di interazione• Prima produzione di top reali: al Tevatron • misure degli accoppiamenti dei top: nelle oscillazioni e decadimenti di mesoni pesanti misure degli accoppiamenti dei top: nelle oscillazioni e decadimenti di mesoni pesanti, ....

La storia non sempre si ripete, ma ....

• NEW PHYSICS (SUSY o altro)NEW PHYSICS (SUSY o altro)• Hint sperimentale: decadimenti (di mesoni o leptoni) non compatibili con lo SM [Babar/Belle,

SuperB, MEG; LHCb (ma non solo), g-2, NA62] • Prima produzione di SUSY (o altro): a LHC• misure degli accoppiamenti di SUSY (o altro): oscillazioni e decadimenti di mesoni • misure degli accoppiamenti di SUSY (o altro): oscillazioni e decadimenti di mesoni

pesanti,[SuperB] ...8 luglio 2011 3

SuperB is t l t i llid

0

not only an asymmetric e+e- collider ...

Parameter Requirement CommentLuminosity 1036 cm-2s-1

@ (4S)Baseline/Flexibility with headroom at 4. 1036

cm-2s-1 ; @ charm threshold 1035 cm-2s-1

Integrated luminosity 75 ab-1 Based on a “New Snowmass Year” of 1.5 x 107 seconds(PEP-II & KEKB experience-based)

CM energy range threshold to For Charm special runs (stillCM energy range threshold to (5S)

For Charm special runs (still asymmetric……)

Minimum boost ≈0.237~(4.18x6.7GeV)

Enhanced boost (up to 0.9) for Charm special runs ( )

e- Polarization ≥80% Enables CP and T violation studies, measurement of g-2 and improvessensitivity to lepton flavor-violating decays.

8 luglio 2011 4

...tuned on time dependent measurements...0

00)4( BBsee (produzione coerente)Reazione:

z2

z1

e-e

z

Babar SuperB< z > 260 m 130 m

zzzt 21

< z > 260 m 130 m E (e+) 9 GeV 6.7 GeVE (e-) 3.1 GeV 4.18 GeV

cc

Vertex precision must be improved

8 luglio 2011 5

Vertex precision must be improved by a factor of 2 at SuperB

... but a Super Flavor Factory, in fact.0

~ 2 ab-1 BaBar (1999-2008) + Belle (1999-2010) Maybe 2018: 6 18 ab-1 if Belle upgraded

Present B-factory

15 ab-1/y => 75 ab-1 (5 years data taking)

Maybe 2018: 6-18 ab 1 if Belle upgradedSuperFlavorFactory

• 0.8x1011 B-Bbar pairs• 1.0x1011 c-cbar pairs• 0 7x1011 pairs

- Limit on B.F. O(10-10)- High precision on asymmetries and B.F.

8 luglio 20116

• 0.7x1011 pairs ymeasurements ...

‘Typical event’ look: Babar display BKs1

Run 29368, event hexID 249a4b/d610dd73

φ→ K+K–

Drift Chamber

Silicon VertexTracker

KS → π+π–

in a very clean environment

8 luglio 2011 7

... in a very clean environment

Precise measurements allow to go beyond LHC energies or to measure couplings

1

g m p g

η’

g~b s

+(δ dRR)b

~b s

d d

s

s Ks

η’

B0 g

+(δ23RR)b

~R

s~Rss

d d

, ,(KK )CP

KS0

Bd dd d S

Note: theoretical calculation on lattice QCD necessary

BaBar / Belle

lattice QCD necessary

LHC direct SuperB SuperB

1 TeV 10 TeV 100 TeV100 GeV

8 luglio 2011 8How many measurements for new physics “indirect” searches can I do ?

... too many: that is the issue !1

8 luglio 2011 9From Ciuchini

SuperBSuperKEKB (partial, no polarization)LHCb (partial, only b decays without )

G-2, MEG, EDM, NA62, LHCb, ATLAS, CMS, CDF

Example: leptonic Decays B 1

SuperB -75ab-1 MH~1.2-2.5 TeV for tan~30-60

Two in the final state=> hermeticity, BRECO

S B

2HDM-II MSSM75ab-1

222

21 tan BH

H

mrm

222

20

0

tan11 tan

0.01

BH

H

mrm

SuperB2ab-1

LEP mH>79.3 GeV

0

ATLAS 30fb−1

ATLAS 30fb−1

ATLAS 30fb−1

8 luglio 2011

10

ATLAS 30fb−1

From A.Stocchi

Observable Babar/Belle

LHCb(10fb-1)

SLHCb(100fb-

SuperB(75ab-1)

Some Comment Theo

No result Moderate Precise Very PreciseSome Golden Modes1

Belle (10fb ) (100fb1)

(75ab )

Vub/Vcb Excl. needs Lattice & Inclusive @ 2% ?

Theo error to be controlled on data (ex: J/0) Theo. error to be controlled on data (ex: J/ )

S(J At 1o theo error controlled with data ?

B Very precise if detector is improved

S-Penguins SLHCb (very) precise for BK, Bs Moderately

THEORY

S Penguins SLHCb (very) precise for BK, BsNot possible for Ks0,ksksks,ks, Ks..

ACP(B Xs) Control syst. Is an issue

Br (B Xs) Syst. Controlled with data ?

B (B X l l)

Clean

CleanBr (B Xs l l)

Br(BK*l l ),Angular var.

Could theory control @20%? Angular analysis are clean ?

Br (B K(*) Stat. limited. With more stat. angular

Need Lattice

CleanBr (B K ganalyses also possible

Br (BKs)

Br(Bs) As precise as Br Ks) ?

Br (B )

From A.Stocchi

8 luglio 2011 11

Br (Bs)

profit of polarized beams

CPV charm SM CPV negligible - clean NP probe

CKM parameters and New PhysicsFuture (SuperB) + Lattice improvementsT d

1

Future (SuperB) + Lattice improvementsToday

nt

will

be

diffe

ren

ks to

LH

Cb

is si

tuat

ion

w@

2015

than

k

= ± 0.0028 = 0.163 ± 0.028

Th

= ± 0.0024 = 0.344± 0.016

Improving CKM isi f

8 luglio 2011 12

crucial to look for NPFrom M.Giorgi

Interests in polarization80% longitudinal polarization for e

1

80% longitudinal polarization for e-

Polarization allows:• Precision Measurement in Precision Measurement in

ElectroWeak sector• EDM and g-2 in τEDM and g-2 in τ • BKG reduction for LFV in τ

8 luglio 2011 13

Precision Measurement in ElectroWeak sector with polarization

1

p

Polarization should be measured better than 0.5%

8 luglio 2011 14

(g-2) with polarization1

(g-2) BNL E8213.6 discrepancy 11SMexp 1081296- aaa

a affects polarization (if beams are not polarized you should measure the angular distribution of decay products in rest frame => difficult)decay products in rest frame => difficult)

... but a polarized beam allows the measurement of the real part of (g-2) just measuring the polar angle production distribution

Able to measure the real part @ (0.7-1.7)x10-6

8 luglio 2011 15

p ( ))4(@ see

LFV: → with polarization1

)4(@ see Signal LFV decay

Most New Physics models predict

SM decay

Most New Physics models predict →emore sensitive than →

SM decay(1- or 3- prong)

(1 or 2 )

But both →eand →But both →eand →necessary to probe the structure of NP models.

But what could LFV be??

8 luglio 2011 16(More promising: →lll )

→ with polarization1

Ultimate sensitivity will be affected by e+e tag , irreducible background. When that limit is reached, the sensitivity scales as 1/sqrt(L).

backgroundsignal

Using polarization we obtain an improvement equivalent to a 2.6 d l l %

8 luglio 2011 17

increase in integrated Luminosity, albeit using only 25% BF

Interest in run at charm threshold1

Dalitz plot model Information on overall strong

500 fb-1 at (3770) with time dependent analysis => boost enhanced

Dalitz plot model uncertainty shrinks

Information on overall strong phase is added

8 luglio 2011 18From B.Meadow

Uncertainty in xD improves more than that of yD

2. The Detector2

Backward Backward task force Forward

task forceIFR

magnet

SVT

ECALDCH

PID

8 luglio 2011 19

Based on BaBar. Well advanced => few options in definition.Proto-organization in place => enhance/modify.R&D for final design => TDR in one year from now

Detector (open) issues2

Last (June 3rd) collaboration meeting:(J ) m gForw. PID: left space (5cm) only for a TOF, TBDBack. EMC: left space (17cm), TBD

• luminosity => rad hard luminosity monitor fast and precise

8 luglio 2011 20

• luminosity => rad hard luminosity monitor, fast and precise.• beam polarization measurement => precise (<0.5%) polarimeter

... everybody believes in the Detector !

3. The machine• Two rings,

3

• asymmetric energies . e- @ 4.18, e+ @ 6.7 GeV• luminosity 1036cm-2s-1 at the Y(4S) (two orders gain with respect to the

first generation B factories) , 1035cm-2s-1 at t/charm threshold• longitudinally polarized electron beamng tu na y p ar z ctr n am

• increasing the density of the bunches at the interaction point (IP) by demagnifying their vertical size to ~30 nm => optimal ring lattice demagnifying their vertical size to ~30 nm => optimal ring lattice design; precise magnets alignment and machine tuning to minimize the emittance coupling;

• betatron oscillations must be kept at minimum => large Piwinski angle and “crab waist” collision scheme (tested in 2009 at Dafne) to and crab waist collision scheme (tested in 2009 at Dafne) to overcome the beam-beam luminosity limit

• reuse of some PEP-II B-Factory hardware (magnets, RF)

• SuperB can also be a good “light source”, collaboration with Italian Institute of Technology

Th d i i t t f th t t h l

8 luglio 2011 21

• The design requires state-of-the-art technology

Machine schemeLER

3

LERarc

HERarc

RF FFHER Energy:6.7 GeV

I.P.l *~ 0.5mPolarization80% for e-

e+

LER Energy:4.2 GeV

LER

e-

e+FF

8 luglio 2011 22HERarc

LERarc

Machine parameters3

1. Baseline 2. Low emittance3. Highcurrents 4. Tau-charm

From M.Biagini

8 luglio 2011 23

Machine: beams at the interaction pointLarge Piwinski angle and “crab waist” collision scheme (tested in

3

g g2009 at Dafne) to overcome the beam-beam luminosity limit

100m

100m

x

-100m1 m

y

-1 m0.5 mm -0.5 mmz

8 luglio 2011 24

Machine: polarization vs e- beam energy4 18 G V

3

4.18 GeV

P.Raimondi

8 luglio 2011 25

Brightness from undulators in dedicated SL sources & SuperB HER and LER

3

p

Wittmer

8 luglio 2011 26

BELLE Luminosity Upgrade Projectonfrom P.Krizan (June 2011)

3

Pl h 50 b 1y

Milestone of SuperKEKBPlan: reach 50 ab-1

in 2020~2021

Lum

inos

ityb-

1 )

9 month/year20 days/month

Inte

grat

ed

(ab

sity Commissioning starts

mid of 2014

5 ab-1 in 2016

Shutdownfor upgrade

eak

Lum

inos

(cm

-2s-

1 ) mid of 2014

8 luglio 2011 27

Pe

The Site: Tor Vergata4

8 luglio 2011 28

Tor Vergata Site => Cabibbo Lab4

Site

About 4 5 KmAbout 4.5 Km

LNF8 luglio 2011 29

LNF

Tor Vergata Site IssuesSite committee Report

4

• John Osborne (Chair) CERN Civil Engineer (experience LHC, CLIC, ILC)• Philippe Eymard Building group, tunnels• Wilhelm Bialowons Physicist and technical, vibration measurements, ILC• Alfredo Fulgenzi Electrical engineer, at LNGS since 1987, LV & HV• Gaetano Schillaci Mechanical and civil construction, 15 years at INS• Franco Gerardi Nuclear Engineer. PM, foundations and structures• John Seeman SLAC PEP2 member of Super B team• John Seeman SLAC PEP2, member of Super B team

8 luglio 2011 30

Tor Vergata Site Issues4

• VIBRATIONS => Discussed next

• COOLING & VENTILATION• water wells are not available and only available supply is from the city drinking water A water wells are not available and only available supply is from the city drinking water. A

dry cooling scheme needs to be further investigated including discussions with local authorities for supply and discharge water.

• The ventilation concept for the tunnel would be of interest to the committee e.g. temperature stability

Cooling and Ventilation issues are not ‘show stoppers’

• ELECTRICITY • The committee learnt that it is believed power stability/ quality of the electrical p y q y

network is adequate• The link to the grid to be better understood and costed : in TOR VERGATA site it is

necessary to build a new HV station and the line links.

• TUNNEL• Note that at CERN, in Molasse rock (fairly similar to the Pozzolane Rock), the average

advancement rate for a 4.5m diameter tunnel for LHC was approximately 30 linear metres per week using a roadheader => 1200m/30 m/wk = 40 weeks

8 luglio 2011 31

Tor Vergata vibration measurements4

B.Bolzon

8 luglio 2011 32

Tor Vergata vibration measurements4

B.Bolzon

Tor Vergata seems to be a very good site for the SuperB project

8 luglio 2011 33

good site for the SuperB project

Accelerator Schedule4

ID Task Name Duration

1H2 H1 H2 H1 H2 H1 H2 H1 H2 H1 H2 H1 H2 H1

Y1 Y2 Y3 Y4 Y5 Y6 Y7

1 Approvazione 0 wks2 Infrastrutture 156 wks3 Scelta del sito 26 wks4 Progettazione edilizia civile 52 wks5 Gara edilizia civile 19 wks6 Costruzione Tunnel, Edifici, e Sala sperim. 78 wks7 Progetto/gara Linac DR & BTL 104 wks

12/22

7 Progetto/gara Linac, DR, & BTL 104 wks8 Progetto e gara Elettr., Raffredd., Cryo. 104 wks9 Progetto & Costruzione Acceleratore 260 wks

10 Progettazione acceleratore 78 wks11 Costruzione magneti 104 wks12 Costruzione sistema vuoto 104 wks13 Costruzione supporti 104 wksCostruzione supporti 104 wks14 Costruzione utilities 104 wks15 Costruzione controlli 104 wks16 Costruzione RF 104 wks17 Costruzione alimentatori 104 wks18 Installazione Acceleratore 110 wks19 Installazione nel tunnel 110 wks20 Installazione Zona Interazione 52 wks21 Installazione Linac, DR, & BTL 65 wks22 Commissioning Acceleratore 71 wks23 Commissioning Linac 39 wks24 Commissioning Fasci 26 wks25 Prime collisioni 0 wks 7/26

34

Detector Schedule4

Detector ScheduleID Task Name Duration

1 Approvazione 0 wks2 Progettazione & Costruzione Rivelatore 182 wks

12/22H2 H1 H2 H1 H2 H1 H2 H1 H2 H1 H2 H1 H2 H1

Y1 Y2 Y3 Y4 Y5 Y6 Y7

3 Progettazione SVT 52 wks4 Costruzione SVT 130 wks5 Progettazione DCH 52 wks6 Costruzione DCH 130 wks7 Progettazione PID 52 wks8 Costruzione PID 130 wks9 Progettazione forward EMC 52 wks9 Progettazione forward EMC 52 wks10 Costruzione forward EMC 130 wks11 Progettazione IFR 52 wks12 Costruzione IFR 130 wks13 Progetto tecnico rivelatore 0 wks14 Smontaggio & Trasporto BABAR 91 wks15 Progettazione Attrezzature 26 wks

12/20

Progettazione Attrezzature 26 wks16 Smontaggio BABAR 52 wks17 Trasporto dei componenti 26 wks18 Installazione e Collaudo Rivelatore 198 wks19 Installazione ferro & IFR 52 wks20 Installazione magnete 13 wks21 Installazione IFR 8 wks22 Installazione EMC 8 wks23 Installazione PID 8 wks24 Installazione DCH 8 wks25 Installazione SVT 8 wks26 Commissioning 26 wks27 Test con raggi cosmici 26 wks28 Commissioning su fascio 15 wks

35

28 Commissioning su fascio 15 wks29 Rivelatore pronto per le collisioni 0 wks 7/5

SuperB Funding4

Funding for accelerator and infrastructure

Computing funding from special funds for south development

256M

Detector funding inside ordinary funding agency budget.

In addition, we re-use parts of PEP-II and Babar, for a value of

b t 135M€IIT contribution (100M?) in addition, mainly for synchrotron

about 135M€

8 luglio 2011 36

mainly for synchrotron light lines construction.

Funding and Management4

• Work for an agreement with Ministry (‘Accordo di Programma’)di Programma )

• MoUs for TDR work in place with Canada, F d

pFrance, UK, Russia and SLAC

• Negotiation with partner countries for • Negotiation with partner countries for construction MoUs started

• The project should be managed through a European Research Infrastructure Consortium (ERIC)( )

8 luglio 2011 37

The Community4

CDR (2007)

signatures ~320:

– 55% BaBar – 20% non-BaBar experimentalists– 12% accelerator physicists– 12% accelerator physicists– 13%theorists

43% It l– 43% Italy– 22% U.S.– 35% other countries

8 luglio 2011 38

t

t=0

8 luglio 2011 39

The Approval Process‘TDR’ phase fundings through INFN

4

TDR phase, fundings through INFN

• Nov. 2005 First meeting at LNF2007 C t l D i R t CDR• 2007 Conceptual Design Report CDR

• 2008 Int. Rev. Comm. (J.Dainton chair) recommend SuperB• Dec. 2009 SuperB-TDR Project approved by INFN• Apr. 2010 SuperB at the top among the Italian National

Research Program (PNR) Flagship Projects• Dec. 2010 first funding of 19M€ as first part of a pluriennal g p p

funding plan internal to Ministry of Research• Apr. 2011 Approval of the PNR, including 250M€ for SuperB• May. 2011 TorVergata site, offered by the Dean of TorVergata May. 2011 TorVergata site, offered by the Dean of TorVergata

University in a written document, is chosen by INFN• Proceed to Technical Design Report (end 2011 / mid 2012 )

8 luglio 2011 40

Next steps / phases4

• Collaboration forming Collaboration forming • Complete Technical Design Report: end 2011 / mid 2012 • End 2011 / early 2012: implement the structure for y p f

funding management and machine construction• Divisions: Site, Accelerator, Detector, Physics.

2012 st t st ti s• 2012: start costructions• Transition to ERIC (at least three UE countries)

– CERN – like structureCERN like structure

• Completion of construction and first collisions in 2016-7

8 luglio 2011 41

Conclusions• A large variety of physics cases well established • A lot of work by hundreds of people from 2005 up to nowy p p p• Got the green light for fundings.

Cabibbo Lab• Site is Tor Vergata => name = Cabibbo Lab ERIC: big management efforts required.

• Machine is highly challenging => name = SuperB ?Very promising studies, it could be even better than promised

• Detector designed with safe baselines => name = SuperB?Some challenging R&Ds could increase performance

•

R d f lli i b 2016 2017 ( fi )8 luglio 2011 42

• Ready for collisions by 2016 – 2017 (cross fingers)

Slide di riserva

8 luglio 2011 43

SuperB• SuperB is a second generation flavor factory aiming for a

luminosity of 1036 cm-2s-1 =1 kHz/nb• The two orders of magnitudes luminosity gain with respect

to the first generation B factories is obtained increasing the density of the bunches at the interaction point (IP) bydensity of the bunches at the interaction point (IP) by demagnifying their vertical size to ~30 nm

• To reach this goal the amplitude of the betatron oscillations t b k t t i imust be kept at minimum

– optimal ring lattice design to minimize the radial emittance– precise magnets alignment and machine tuning to minimize the p g g g

emittance coupling – large Piwinsky angle and crab waist collision scheme to overcome

the beam-beam luminosity limit

8 luglio 2011 44

44

y

Recoil physics at the (4S)

e- D*

+Breco

“The Recoil Method “ will be

of increasing importance at SuperB Fully reconstruct one of

e+Brecoil

X

the two B’s

The rest of the event is the otherB whose four-momentum is known

• B D(*)lB ()l

XuB, whose four-momentum is known

You then have a single B beam: reduced backgrounds for B D lB ()l

• BXc,ul B D(*)• B

rare decay studies, especially those with neutrinos, and

reduced systematics forprecision V V studies

• B K• B invisible

precision Vcb, Vubub studies

8 luglio 2011 45• B Xs

Recoil method performance

ed B

mes

ons

Xc Xu Rec

onst

ruct

sD

oil e

vent

s

0 2 4 6 8 10 Luminosity (ab-1)

mbe

r of r

eco

1 10-2 10-1 1 10Luminosity (ab-1)

Num

8 luglio 2011 46

Crossing angle conceptsOverlapping All colliders do need short bunches

S

Overlappingregion

All colliders do need short bunchesto decrease the hourglass effect andthe beams disruption

With l i l X d ZSz

Sx Both cases have the same luminosity,(2) has longer bunch and smaller x

p

With large crossing angle X and Z quantities are swapped: Very important!!!

Sz

1) Standardshort bunches

Overlappingregion

Sz

8 luglio 2011 472) Crossing angleSx

x

e-Y

2Sx/

e-e+

z

2Sz*

2Sz

2Sx

Crab waist removes bb betatron couplingIntroduced by the crossing angle

Vertical waist has to be a function of x:Z=0 for particles at –x (- x/2 at low current)Z= / for particles at + ( /2 at low current)

8 luglio 2011 48

Z= x/ for particles at + x (x/2 at low current)Crab waist realized with 2 sextupoles in phase with the IP in X and at /2 in Y

Crab Waist Advantages

1. Large Piwinski’s anglea) Geometric luminosity gain

b) Very low horizontal tune shiftg g

= tg(z/x

b) Very low horizontal tune shift

a) Geometric luminosity gain2. Vertical beta comparable

with overlap area

a) Geometric luminosity gain

b) Lower vertical tune shift

c) Vertical tune shift decreases y x/

3 C bb d i t t f ti

)with oscillation amplitude

d) Suppression of vertical synchro-betatron resonances

3. Crabbed waist transformation

y = xy’/(2)

synchro betatron resonances

a) Geometric luminosity gain

8 luglio 2011 49

b) Suppression of X-Y betatron and synchro-betatron resonances

Machine – Beam- Beam

Red: goodBlu: bad

8 luglio 2011 50D. Shatilov

Understanding background

For the time being the stripletFor the time being the striplet solution is still the baseline for layer L0.Pixels are under study and the R@D continues in various labs : Italian labs and Rutherford.

8 luglio 2011 52

52M.A.Giorgi

SVT Layer 0Point resol tion specs can be met eitherPoint resolution specs can be met either

by double sided silicon strips or pixels. But…. performance in high background environment at small radius crucial!environment at small radius crucial!

Possible Solutions :1) Striplets (CDR baseline)

A il bl t h l ( ith d t d l t )• Available technology (with modest developments)• Reduce strip length to cope with hits rates to ~

1MHz/cm

2) Monolithic Active Pixel Arrays (MAPs)2) Monolithic Active Pixel Arrays (MAPs)• Requires substantial R&D (ongoing). • Cooling and mechanical issues challenging.• But much more robust against high backgrounds.

8 luglio 2011 53

8 luglio 2011 54

54

• Provides precision momentum (and good particle ID via dE/dx) for all low momentum

DCH Baseline DesignBaBar DCHparticle ID via dE/dx) for all low momentum

tracks, even those that miss the PID system.

• A new DCH (very similar to now aged BaBar DCH which must be replaced)

BaBar DCH

BaBar DCH, which must be replaced) • Same gas & cell shape (small

improvements may be possible)• Carbon Fiber end plates (to reduce

material before endcaps)material before endcaps)• New electronics with location

optimized.• Background simulation occupancy ~

OK (7% to 1.5% depending critically on ( p g yIR shielding).

• R&D Issues include:• Electronics (location to avoid backward (

EMC, mass, cluster counting?)• Conical carbon fiber endplates.• Background simulation/shielding

optimization.

8 luglio 2011 55

8 luglio 2011 56

56

• For P > 0.7 GeV/c. (dE/dx < 0.7 GeV/c)

PID Detector (DIRC)• Barrel: reuse BaBar DIRC quartz bars

• Excellent performance to 4 GeV/c.• Robust operation.• Elegant mechanical supportElegant mechanical support.• Photon detectors outside field region.• Radiation hard fused silica radiators.• But...PMTs are slow and aging. Need

replacement Large SOB region senstivereplacement. Large SOB region senstive to backgrounds so volume reduction is desirable.

8 luglio 2011 57

EMC BaBar Barrel 5760 CsI(Tl)

Crystals

Baseline• BaBar barrel crystals can be reused. Most expensive detector component.• Backgrounds dominated by radiative Bhabhas. IR shielding design is crucial.

B li i t t i b l t d h t di d d t D t d d b t• Baseline is to retain barrel geometry and photo-diode readout. Due to decreased boast, will shift interaction point wrt normal crystal gap from -5 to +5 cm. Overall increase in Barrel coverage from 79.5% to 84.1%.

• Forward Endcap EMC • Endcap BaBar Crystals are radiation damaged Need replacement• Endcap BaBar Crystals are radiation damaged. Need replacement.• At forward angles in SuperB, CsI(Tl) is too slow (occupancy) and radiation soft.

Propose LYSO.

Option for Backward EndcapOption for Backward Endcap• Best possible hermiticity important for fully inclusive decays and decays with neutral

energy. 4.5% of solid angle is in backward endcap. • But DCH material, DIRC bars, and DCH readout unavoidable.

Ph i i d f l t CDR id t d i

8 luglio 2011 58

• Physics gains need careful assessment. CDR considers veto device.

Forward & Backward CalorimeterThe SuperB calorimeter will reuse the Babar barrel of CsI crystals. In the

forward endcap CsI will be replced with YLSO crystals, while for the backward the solution is lead+scintillating fibers 2 8 mm Pb alternated withbackward the solution is lead+scintillating fibers 2.8 mm Pb alternated with scintillator for different layers there are different

patterns :• Right handed logarithmic spiralRight handed logarithmic spiral• Left-handed logarithmic spiral • Radial wedgeThe readout fibers are embedded in groovesThe readout fibers are embedded in grooves cut in scintillator.As Photo-Detector a pixel device will be used :Either MPPC or SiPMEither MPPC or SiPM.

8 luglio 2011 59

59

IFR

Baseline• Add iron to BaBar stack to improve

ID. 7-8 detection layers.

• Re-use BaBar steel (still to be fullyRe-use BaBar steel (still to be fully assessed)

• Backgrounds are problematic for gas detectors.U Mi t l i till ti bUse Minos style scintillation bars.

8 luglio 2011 60