The SuperB Experimentsteven/StevenWebFiles/Talks/... · Jun 8, 2008 The SuperB Experiment Steven Robertson, Institute of Particle Physics 11 2001: First concept for a SLAC-based high

The SuperBThe SuperBExperimentExperiment

Steven RobertsonInstitute of Particle Physics

Canadian Association of Phyicists Congress 2008

Québec City, Québec June 10, 2008

Jun 8, 2008 2Steven Robertson, Institute of Particle PhysicsThe SuperB Experiment

Why Flavour?Why Flavour?Flavour sector contains 20 (22) of 25 (27) parameters of the SM, which

are intrinsically connected to EW physics and symmetry breaking ● Tantalizing structure (similarly for lepton sector) which is not predicted

by the SM:

Regardless of whether observable non-SM physics exists at the TeV scale, CKM structure hints that there is something important that we don't understand

B → ψKS

B → φKS

B0 → D*π B+ → D0

CP K+

α

γ β

Vtd V

tb *

VcdVcb*

V udV ub

*

B0 → π+π−

B0 → ρ+ρ−b → ulν

b → clν

B0B0 mixing


What is the New Physics scale?What is the New Physics scale?● Quantum stabilization of the weak scale suggests <TeV

(naturalness argument)

Scale can easily be pushed beyond 1 TeV with moderate fine-tuning


MSSM + generic soft-SUSY breaking terms:● All flavour changing NP effects in squark propogators

NP scale given by SUSY masses:

Flavour violating coupings:

2q ij

m

211m 2

12m 213m

221m 2

22m 223m

231m 2

32m 233m

mixing – precision flavour frontier

masses – energy frontier

SUSY and FlavourSUSY and Flavour


Effective theory approachEffective theory approach

In explicit models:● Λ ~ mass of virtual particles

(e.g. Fermi theory.: mW)

● C ~ (loop coupling) x (flavour coupling)

(e.g. SM/MFV: αw x CKM)

New Physics scale

Effective flavour-violating couplings

Increasing luminosity

Precision flavour measurements provide bounds on ratio C / Λ i.e. constrain coupling strengths at any given mass scale


Sensitivity (MFV) ~200GeV

Present Flavour ContraintsPresent Flavour Contraints

2 2 2

2

d

NP

q

SMi B B

SMB

C Q QeQ

φ Δ Δ

Δ

1034 luminosity gives measureable effects if NP is at the EW scale

BABAR/Belle purpose: “test SM mechanism for CP violation”

E.g. Model independent parameterization of New Physics contributions to B mixing amplitudes:


SuperB SensitivitySuperB SensitivityE.g. Model independent parameterization of New Physics

contributions to B mixing amplitudes:

1036 luminosity gives measureable effects if NP is at the TeV scale

SuperBSensitivity (MFV)

~1TeV

SuperB purpose: search for and study NP effects in flavour

2 2 2

2

d

NP

q

SMi B B

SMB

C Q QeQ

φ Δ Δ

Δ


SuperB SensitivitySuperB Sensitivity

1036 luminosity gives measureable effects if NP is at the TeV scale

Using current central values of CKM measurements:

Using SM values of CKM measurements:

?


Towards a no-lose theorum...Towards a no-lose theorum...Assuming the LHC observes New Physics:● Study flavour structure of NP using precision flavour studies

If the LHC does not (immediately) observe New Physics:● Precision flavour studies may point to NP scale● Might even provide first observation of identifiable NP

iq jqiq jq2q 23(13)(m )

2q ij

m

211m 2

12m 213m

221m 2

22m 223m

231m 2

32m 233m

Squark/slepton mass matrix sensitive to SUSY breaking mechanism, hence complementary information helps to clarify the NP scenario

f

bq

e f

δ

Λ


The SuperB ProjectThe SuperB Project● SuperB is a 1036 luminosity e+e- asymmetric energy collider

(7 GeV on 4 GeV at the (4S) resonanceϒ ) with the capability to operate from charm threshold to the (5S)ϒ● Proposed to be hosted by the INFN - Laboratori Nazionali di

Frascati (LNF) in Italy● Accelerator concept based on an ultra low emittance design

exploiting the ILC damping ring lattice and ILC final focus● Comparitively low beam currents and clean experimental

environment● Reuse of (esssentially all) PEP-II magnets and RF

● Detector concept based on extensive reuse of BABAR experiment components, including software where appropriate

⇒ Target datasample: 75ab-1 (approximately 100x present world BB data sample)


● 2001: First concept for a SLAC-based high luminosity B factory presented at Snowmass 2001

● 2001-2004: KEK high lumi B-factory workshops (6)● 2003: 1036 workshops in 2003 – proceedings in SLAC-R-709

● Focus on physics case● 2004: KEKB proposal for upgrades to KEKB machine that

could reach 5x1035 (KEK Report 2004-4)● 2004-2005: 1st&2nd Joint SuperB Workshops in Hawaii

● First presentation of low-emittance, low beam currrent concept:

● Manageable backgrounds, 1036 feasible with affordable power demands

A Brief SuperB HistoryA Brief SuperB History


Recent HistoryRecent History● 2005: International SuperB Study Group formed

● study physics case, machine, detector● 2006: Invitation from INFN for a submission of a Conceptual

Design Report: ● refinements of machine design - efforts at SLAC and INFN to

develop realistic concept; detector conceptual design● International Steering Committee established (M.A. Giorgi chair)

● members from Canada (M. Roney, D. Asner), France, Germany, Italy, Russia, Spain, UK, US

● Completion of CDR at 5th SuperB Workshop in May 2007 (Paris)● 2008: Formation of Machine Advisory Committee (J.Dorfan chair)● 2008: Positive recommedation by International Review Committee

to proceed towards a Technical Design Report...


3 Chapters : Physics Case Detector Machine

444 pages 320 signatures~80 institutions

Special dedicated meeting to answer the IRC questions on physics

and to sharpen the physics case

49 authors~24 institutions

arXiv:0709.0451 [hep-ex]

● Significant contributions by the Canadian community to both the physics case and the detector description


The IRC ReportThe IRC Report● External review of SuperB proposal requested by INFN to evaluate

all aspects of the project (accelerator, detector and physics reach) ● Initial report released last month:


SuperB Accelerator ParametersSuperB Accelerator ParametersDesign based on recycling of PEP-IIhardware: dipoles, quadrupoles, sextupoles and RF system

Design includes longitudinal polarization for e- beam

Beam currents below 2A for luminosity up to 2x1036 cm-2s-1

Ultra low emittance lattice: inspired by ILC Damping Rings

Horizontal crossing angle and crab waist scheme minimize beam blow-up and maximize luminosity

Total ring power is lower than PEP-II


Total length 1800 m

280 m

20 m

Lmag (m) 0.45 5.4

PEP HER - 194

PEP LER 194 -

SBF HER - 130

SBF LER 224 18

SBF Total 224 148

Needed 30 0

Dipoles

Lmag (m) 0.56 0.73 0.43 0.7 0.4

PEP HER 202 82 - - -

PEP LER - - 353 - -

SBF HER 165 108 - 2 2

SBF LER 88 108 165 2 2

SBF Total 253 216 165 4 4

Needed 51* 134 0 4 4

Quad.

Available

Needed

Lattice layout and PEP-II reuseLattice layout and PEP-II reuse

● All PEP-II magnets are used, dimensions and fields are in range, ● RF requirements are met by the present PEP-II RF system


Crab sextupoles OFF

Crab sextupoles ON

waist line is orthogonal to the axis of one bunch

waist moves to the axis of other beam

All particles from both beams collide in the minimum βy region, with a net luminosity gain

Courtesy of E. Paoloni

Crab Waist ConceptCrab Waist Concept● Large crossing-angle scheme elliminates parasitic bunch crossings,

but introduces beam-beam betatron coupling resonances


Test of Crab waist concept recently performed at LNF for the DAΦNE accelerator upgrade● Crab sextupoles are working

nicely and results are in good agreement with simulation:

https://agenda.infn.it/materialDisplay.py?materialId=0&confId=501

DADAΦΦNE Crab Waist TestNE Crab Waist TestM

easu

red

Bha

bha

rate

Crab sextupoles off




Proposed SiteProposed Site● Tor Vertaga site located on the Roma II university campus near the

Frascati laboratory● Green-field site, but civil construction and infrastructure support

anticipated for SPARX FEL project beginning this year

● Siesmic and geological studies complete

● Interest (and funding support) from regional government

● Strong support from INFN


SuperB Ring (about 1800m)

SPARX

Roman Villa100m

SuperB Injector (about 400m)

SuperB Main Building

Tor Vergata Site Tor Vergata Site


Experimental AreaExperimental Area● Initial concept for layout of

SuperB experimental area now available● civil construction could begin as

soon as next year: significant cost savings if coupled to SPARX construction


SuperB DetectorSuperB DetectorDetector concept based on reuse of BABAR components with

replacement/upgrades to ensure “SuperB” physics performance

Super-conducting solenoid

CsI(Tl) barrel calorimeter and support structure

DIRC quartz bars

Muon system iron/flux return (?)


SuperB DetectorSuperB DetectorDetector concept based on reuse of BABAR components with

replacement/upgrades to ensure “SuperB” physics performance

Compact DIRC readout

Backward endcap calorimeter

Silicon pixelvertex tracker

L(Y)SO crystal forward endcap calorimeter

Forward PID

Improved muon detector


Silicon Vertex DetectorSilicon Vertex Detector● Reduced boost (compared with BABAR) requires improved vertex

resolution to obtain same performance● Small beampipe (1.5cm radius), better single-hit resolution

● Basic R&D for CMOS MAPS in progress (most challenging option for first detector layer):● Optimization of the Deep NWell MAPS pixel S/N ~ 25 with low power

consumptionAPSEL4D - Fe55 5.9 keV calibration peak

APSEL4D – Sr90 test

Fired pixel map with threshodl @ ½ MIP

Good uniformity (the source was positioned on the left side of the matrix

APSEL4D - 32x128 pixels 50 µm pixel pitch

Preliminary test encouraging:Good sensitivity to e- from Sr90 and Fe55 source


Calorimeter and Forward PIDCalorimeter and Forward PIDCsI(Tl) barrel EM calorimeter can be retained in SuperB with minor

modifications but the forward endcap must be replaced ● LYSO (lutetium yttrium orthosilicate): Faster decay time, smaller

Molière radius, shorter radiation length, radiation hard● More compact crystals, leaving space for a forward PID system

Two options being considered for forward PID:● TOF● Focusing RICH: three layer aerogel array (nmax =1.07) with 3mm

pixels


Rear Endcap CalorimeterRear Endcap CalorimeterBackward calorimetry needed to improve detector hermeticity for

inclusive/missing energy studies● resolution doesn't have to be great, but at least “veto” capability● severe space constraints from DCH electronics and DIRC readout

system

Pb/scintillating tile device using SiPM readout, built as two D's to fit within the DIRC tunnel

● 12 X0, with 0.5 X0 sampling

● Energy resolution ~15%/E (GeV)


SuperB Physics ReachSuperB Physics Reach● Physics case has been (exhaustively) explored

in a series of workshops leading up to the SuperB CDR and the subsequent Valencia Workshop proceedings (no reference yet available)● Rich program of B, charm and τ physics, plus

additionally exotic states and spectroscopyThe Discovery Potential of a Super B Factory (Slac-R-709,

hep-ph/0503261)

Physics at Super B Factory (hep-ex/0406071)

Complementarity with LHC has been studied in the CERN workshop Flavour Physics in the era of LHC . (M.Mangano,T.Hurth to be published soon as CERN yellow report)


Charm FCNC

Charm mixing and CPB Physics @ U(4S)

Bs Physics @ U(5S)τ Physics


SuperB Physics ReachSuperB Physics Reach● Physics case has been (exhaustively) explored

in a series of workshops leading up to the SuperB CDR and the subsequent Valencia Workshop proceedings (no reference yet available)● Rich program of B, charm and τ physics, plus

additionally exotic states and spectroscopyThe Discovery Potential of a Super B Factory (Slac-R-709,

hep-ph/0503261)

Physics at Super B Factory (hep-ex/0406071)

Complementarity with LHC has been studied in the CERN workshop Flavour Physics in the era of LHC . (M.Mangano,T.Hurth to be published soon as CERN yellow report)

● IRC requested a “sharpening of the physics case”...● Identification of specific “golden modes”● NP sensitivity studied in the context of “SPS” points which are used

as benchmarks for the LHC


XX The GOLDEN channel for the given scenario

O Not the GOLDEN channel for the given NP scenario but can show experimentally measurable deviations from SM.

Golden modesGolden modes● Very difficult question for SuperB, since NP evidence would

likely arise from interplay between many measurements...

● None of these are expected to be accessible from measurements at hadron colliders

From Valencia report


Example: Leptonic B decaysExample: Leptonic B decays

SuperB -75ab-1

MH~1.2-2.5 TeVfor tanβ~30-60

tan β

2ab-1

MH~0.4-0.8 TeVfor tanβ~30-60

2ab-1

75ab-1

tan β

10ab-1

tan β

What a signal would look like with MH=350GeV

Higgs-mediated NP in MFV at large tanβ


MFV: Snowmass PointsMFV: Snowmass Points

mSUGRA benchmark points for LHCNo flavour structure defined (MFV)

SPS1a is the least favorable

for flavour, but SuperB and

only SuperB can observe ~2σ

deviations in several observables

SPS4 is already ruled out by present values of Βsγ.


Many channels can be measured with ΔS~(0.01-0.04)

d d

sbW

B0d

t ss

ϕ

K0

g

sb b s

~

~ ~

LRd

23δ

NP in sin2NP in sin2ββ in “s-penguins” in “s-penguins”

SuperB

(*) theoretical limited


Importance of having very large sample >75ab-1

Im (δ

13) LL

Im (δ

13) LL

Re (δ13)LLRe (δ13)LL

SM SM

Determination of coupling [in this case : (δ13)LL]

with 10 ab-1 and 75 ab-1

How much data is too much?How much data is too much?


Very important order of magnitude 10-8 10-9

Complementarity with µ e γ

MEG sensitivity µeγ ~10-13

LFV

2

5σ disc

107 B

R (τ

µγ

M1/2

SuperB

SO(10) MSSM

LFV from PMNS

LFV from CKM

LFV from CKMLepton MFV GUT models

LFV from PMNS

ττ Lepton flavour violation Lepton flavour violation


ProspectsProspectsSupport for SuperB project has been growing rapidly over the past

few years:● Physics case is solid – strong support from theory community● Still substantial challenges for the accelerator, but no show-stoppers● Polical developments in Italy, Europe and North America all appear

favourable

Significant Canadian involvement recently in the SuperB project, in particular the CDR and Valencia documents● Potential for detector and accelerator R&D over next few years

⇒ Need to build a Canadian community in anticipation of the submission of a first NSERC project request this fall

For more information about the SuperB project, visit www.pi.infn.it/SuperB


Backup slidesBackup slides


● Asner and Roney serve on the SuperB International Steering Committee

● Three members of IPP community (Asner, Robertson, Roney) were awarded an SRO to fund attendance at SuperB meetings & enables participation in proto-collaboration

● Seven members of the IPP community have signed the CDR (Asner, Hearty, Kowalewski, McKenna, Patel, Robertson, Roney) – represent interest at Carleton, McGill, UBC, UVic ● other members of Canadian community have expressed interest if

project goes forward ● Canadian interests to focus on potential hardware projects ● Assuming international partners continue the current

trajectory – anticipate submitting R&D request in 2008 ● Begin exploring potential role of TRIUMF (5-year plan)

Canadian ParticipationCanadian Participation


● Strong tradition of Canadian engagement in flavour physics: ARGUS, CLEO, OPAL, BABAR, CDF + many theorists

● Reflected in IPP Submission to Subatomic Physics Long Range Planning: foresaw support for Canadian participation in an international high-luminosity B-factory

● Subatomic Physics Long Range plan “recommends as a high priority: Maintenance of a diversity of research efforts, allowing the community to exploit new opportunities and novel ideas as they arise.”

● The development of the 1036 SuperB flavour factory using ILC FF and DR concepts occurred subsequent to the LRP process and represents the type of new opportunity foreseen by the community in its LRP priority list

● TRIUMF 5 year plan – awating final report

Canadian ContextCanadian Context


P5 Report (May 29P5 Report (May 29thth 2008) 2008)● “The intermediate budget scenario would allow in addition pursuing

significant participation in one overseas next-generation B factory”●

●

●


International Review(s)International Review(s)

INFN IRC Members• John Dainton – UK/Daresbury,

chair• Jacques Lefrancois – F/Orsay• Antonio Masiero – I/Padova• Rolf Heuer – D/ Desy• Daniel Schulte – CERN• Abe Seiden – USA/UCSC• Young-Kee Kim – USA/FNAL• Hiroaki Aihara – Japan/Tokyo

Also participating in last meeting+ Tatsuya Nakada in representation

of RECFA+ Steve Myers – accel expert

RECFA Committee setup• Tatsuya Nakada• Yanis Karyotakis• Frank Linde• Bernhard SpaanWill join us for the SuperB workshop- SuperB presented already twice at

ECFA

P5 presentation made in February


Funding modelFunding model● The SuperB budget model still needs to be fully

developed. It is based on the following elements (all being negotiated)● Italian government ad hoc contribution● Regione Lazio contribution for infrastructure● INFN regular budget● EU contribution ● In-kind contribution (PEP-II + Babar elements)● Partner countries contributions

● Clearly the SuperB project is inherently international and will need to be managed internationally● Through a dedicated Project Office


Accelerator and site costsAccelerator and site costs

NumberEDIA Labor M\&S Rep.Val.WBS Item Unitsmm mm kEuro kEuro1 Accelerator 5429 3497 191166 1263301.1 Project management 2112 96 1800 01.2 Magnet and support system 666 1199 28965 253801.3 Vacuum system 620 520 27600 142001.4 RF system 272 304 22300 600001.5 Interaction region 370 478 10950 01.6 Controls, Diagnostics, Feedback 963 648 12951 87501.7 Injection and transport systems 426 252 86600 18000

NumberEDIA Labor M\&S Rep.Val.WBS Item Unitsmm mm kEuro kEuro2.0 Site 1424 1660 105700 02.1 Site Utilities 820 1040 31700 02.2 Tunnel and Support Buildings 604 620 74000 0

Note: site cost estimate not as detailed as other estimates.


Detector costDetector costEDIA Labor M\&S Rep.Val.

WBS Item mm mm kEuro kEuro1 SuperB detector 3391 1873 40747 464711.0 Interaction region 10 4 210 01.1 Tracker (SVT + L0 MAPS) 248 348 5615 01.1.1 SVT 142 317 4380 01.1.2 L0 Striplet option 23 33 324 01.1.3 L0 MAPS option 106 32 1235 01.2 DCH 113 104 2862 01.3 PID (DIRC Pixilated PMTs + TOF) 110 222 7953 67281.3.1 DIRC barrel - Pixilated PMTs 78 152 4527 67281.3.1 DIRC barrel - Focusing DIRC 92 179 6959 67281.3.2 Forward TOF 32 70 3426 01.4 EMC 136 222 10095 301201.4.1 Barrel EMC 20 5 171 301201.4.2 Forward EMC 73 152 6828 01.4.3 Backward EMC 42 65 3096 01.5 IFR (scintillator) 56 54 1268 01.6 Magnet 87 47 1545 96231.7 Electronics 286 213 5565 01.8 Online computing 1272 34 1624 01.9 Installation and integration 353 624 3830 01.A Project Management 720 0 180 0

Note: options in italics are not summed. We chose to sum the options weconsidered most likely/necessary.


ScheduleSchedule

● Overall schedule dominated by:● Site construction● PEP-II/Babar

disassembly, transport, and reassembly

● We consider possible to reach the commissioning phase after 5 years from T0.



23| |LRδ

1 10

1

10-1

10-2

(TeV)gluinom

In the red regions the δ are measured with a

significance >3σ away from zero

23| |LRδ

Arg(δ23)LR=(44.5± 2.6)o

= (0.026 ± 0.005)

1 TeV

g

sb b s

~

~ ~

New Physics contribution (2-3 families)

LRd

23δ

MSSM+generic soft SUSY breaking terms

Flavour-changing NP effects in the squark propagator NP scale SUSY mass

flavour-violating coupling


Further improvements if polarized beams.

Very important order of magnitude 10-8 10-9

Complementarity with µ e γ

SFF is also a τ factory golden measurement LFV


CMSSM : µeγ vanish at all SPS pointsMVF-NP extentions : µeγ alos vanish s130τµγ is independent.

LFV

2

5σ disc

ττ Lepton flavour violation Lepton flavour violation


Charm physics at threshold

D decay form factor and decay constant @ 1% Dalitz structure useful for γ measurement

0.3 ab-1

Rare decays FCNC down to 10-8

Consider that running 4 month at threshold we will collect 1000 times the stat. of CLEO-C~ 10 times of futire BESIII

ξ~1%, exclusive Vub ~ few % syst. error on γ from Dalitz Model <1o

D mixing

CP Violation in mixing could now addressed

Strong dynamics and CKM measurements

Charm physics using the charm produced at Υ(4S)

Charm Physics

Better studied usingthe high statistics collected at Υ(4S)

@threshold(4GeV)

@th

resh

old(

4GeV

)


CP Violation in charm NOW

SuperB



SPARX 1st stage SuperB LINAC

SPARX future

SuperB footprint on Tor Vergata siteSuperB footprint on Tor Vergata site

600 m

500 m


Signatures breakdown by type

Accelerator physicists

12%

Theorists13%

Experimentalists75%

Signatures breakdown by country

Australia, 1

Canada, 7

France, 21

Germany, 11

Israel, 2

Italy, 137

Japan, 4

Norway, 1

ROC, 3

Russia, 18

Slovenia, 5

Spain, 12

Switzerland, 4

UK, 24

USA, 70 AustraliaCanadaFranceGermanyIsraelItalyJapanNorwayROCRussiaSloveniaSpainSwitzerlandUKUSA

Drop Page Fields Here

SignaturesCountry

Drop Series Fields Here

The SuperB CDRThe SuperB CDR

• 320 CDR signatures• 85 Institutions• 239 Experimentalists

CountriesParticipants

“Conceptual Design Report” (450 pp), March 2007 INFN/AE-07/2,SLAC-R-856, LAL 07-15, arXiv:0709.0451 [hep-ex]

www.pi.infn.it/SuperB/?q=CDR

200 pages on Accelerator


Scaling an Existing B-factory MachineScaling an Existing B-factory Machine

(10341036cm-2s-1) increase in luminosity possible from extrapolation of requirements from existing machines à la SuperKeKB

• Parameters:

● higher currents● smaller damping time● shorter bunches● crab collision● higher disruption● higher power

● Operational issues:● Increased wall power ($$$..)

>100MW● high currents ● short bunches● high machine backgrounds: explosion of backgrounds in detector

● Partially ameliorated with new IP scheme of large crossing angle and crab waist● Effective limitation around 5x1035cm-2s-1


Current Status: Current Status: CDR baseline MachineCDR baseline Machine● Present parameter set based on ILC damping ring-like parameters: 3.0km long

rings sudied with ILC OCS (baseline) lattice scaled to 4 and 7GeV● same DR emittances● same DR bunch length● 1.5 times DR bunch charges● Same ILC-IP betas

● Crossing angle and “crab waist” to maximize luminosity and minimize blowup

● to be tested late 2007 on DAFNE● Use PEP-KEK DR damping time 17ms● fewer and lower field wigglers used● Final Focus (ILC-like) included● Design based on re-use of all PEP-II hardware, Bends, Quads and Sexts and

RF system● very significant in-kind contribution

● Maximize lumi but keep low ΔE and wall power● Total power: 35MW, as in PEP-II

● Simulations performed using different code at a number of different labs:● LNF, BINP, KEK, LAL, CERN


Current Status: Current Status: CDR baseline MachineCDR baseline Machine

1 10361.7 10341.2 1034L

0.160.10.07ζy

16/32 msec~ the same16/32 msecTau l/t

6 mm6 mm10 mmBunch length

0,25 %(0,035µm)

0.1 %(~3µm)

0,5-1 %(~6µm)

y/x coupling(sigma y)

1,6 nm (~6µm)

~ the same (~80µ

m)23 nm (~100µm)Emity (sigmay)

20 mm300 mm400 mmbetax

0.3 mm6 mm10 mmbetay

2.3 A1.7 A2.5 AcurrentSuperBKEKBPEPII


The RingsThe Rings

• HER, 7 GeV and LER, 4 GeV, same length and similar lattice● Horizontal crossing angle at the IP and “crab waist” are used to

maximize luminosity and minimize beam size blow-up ● Ultra low emittance lattice: inspired by ILC Damping Rings● Circumference fits in the Tor Vergata campus site● No “emittance” wigglers used in Phase 1 ● Beam currents below 2 A for a luminosity up to 2x1036 cm-2s-1

● Design based on recycling all PEP-II hardware: dipoles, quadrupoles, sextupoles, RF system, and possibly vacuum system (saving a lot of money)

• Longitudinal polarization for e- is included● Maximized luminosity while keeping low wall power:

– Total rings power: 17 MW, lower than PEP-II


Crossing angle concepts

● With large crossing angle X and Z ● quantities are swappedSz

Sx

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

1) Standardshort bunches

2) Crossing angle

Overlapping region

Sx

Sz

Overlapping region


Vertical waist has to be a function of x: Crabbed waist realized with a sextupole in phase with the IP in X and at / 2 in Y For a fixed longitudinal position, y does not depend on the horizontal motion anymore: No

vertical modulation due to horizontal oscillations

2Sz

2Sx

θ

z

x

2Sx/θ

2Sz*θ

e-e+βY

Crab waist removes beam-beam betratron coupling resonancesintroduced by the crossing angle

Crab Waist Concept Crab Waist Concept P.Raimundi


Machine Parameters (slightly different from CDR)Machine Parameters (slightly different from CDR)

Asymmetric bunch size to optimize beam lifetime (Toushek effect)

LEB HEB

Circumference in CDR was 2200 m

Baseline150m needed for Polarization


● To increase Luminosity of ~ two orders of magnitude bordeline parameters are needed, such as (KEKB):● Very high currents● Smaller damping times Difficult and costly● Shorter bunches (avoid hourglass) operation (HOM, RF● Crab cavities for head-on collision power, backgrounds)● Higher power

• SuperB exploits an alternative approach, with a new IP scheme (P.Raimondi, LNF):● Small beams (ILC-DR like) Tough to achieve● Large Piwinski angle and “crab waist” transformation● Currents comparable to present Factories

Both require status-of-the-art technology

Two approaches to achieve high luminosity


• Ultra-low emittance (ILC-DR like)

• Very small β at IP

• Large crossing angle

● “Crab Waist” scheme

• Small collision area• Lower β is possible

• NO parasitic crossings

● NO synchro-betatron resonances due to crossing angle

SuperB approachSuperB approach

Test at DAΦNEnow !!!


Comparison of SuperB to Super-KEKBComparison of SuperB to Super-KEKB

Jun 8, 2008 65Steven Robertson, Institute of Particle PhysicsThe SuperB ExperimentS. Bettoni (CERN), E. Paoloni (Pisa), S. Bettoni’s talk tomorrow

• QD0 is common to HER and LER, with axis displaced toward incoming beams to reduce synchrotron radiation fan on SVT

• Dipolar component due to off-axis QD0 induces, as in all crossing angle geometries, an over-bending of low energy out coming particles eventually hitting the pipe or detector

• New QD0 design based on SC “helical-type” windings

IP layout, “Siamese twins QD0”




The SuperB ProcessThe SuperB Process

(Courtesy of M. Biagini)2005 2006 2007 2008

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The Flavour ProblemThe Flavour ProblemLoosely stated, generic New Physics would imply observable effects

which are are inconsistent with experiment unless either the New Physics scale is high (e.g. 1-0-100TeV) or the (loop x flavour) couplings are small

● F=2 processes occur at the loop level, thus could receive O(1) NP corrections but effects > ~20% are excluded

NP < 1 TeV● suppression of flavour violating couplings required in all sectors

possibly pointing to MFV. SUSY can stabilize the Fermi scale with mild fine-tuning

If 1< NP < 10-100 TeV● suppression of flavour violating couplings needed in sector 1-2 only.

No indication of MFV. SUSY can still stabilize the Fermi scale with moderate fine-tuning


ΔF=2 parameterizationΔF=2 parameterization


Comparison with LHCbComparison with LHCb

From T. Iijima, 2005 Hawaii SuperB Workshop, Physics at Super B Factory (hep-ex/0406071)

5ab-1 50ab-1 LHCb 2fb-1 (c.2010)


Progress in simulationProgress in simulation● Development of both fast (parametrized) and full (Geant4)

simulation programs started.• Reuse Babar code where possible

– Remove dependencies from private Babar code to allow redistribution to outside Babar

– Principle approved by Babar council – work on technical issues ongoing

– Use more modern approach to geometry description (GDML, developed for LHC)

• Fast simulation targeted at physics benchmarking

• Geant4 simulation targeted at backgrounds

Geant4 Model (cylindrical)

E. Paoloni, M.Rama

May 31, 2008 F.Forti - Detector Status 73

SuperB-IFR: detection efficiency SuperB-IFR: detection efficiency

adc channels

1 p.e.2 p.e.

pedestal

ADC spectrum for MPPC fiber 350 cm long

1.5 p.e. Cut

• Average number of p.e.: ~ 9 at maximum distance (~4m)

• Efficiency better that 95%

Present baseline configuration:

scintillator: 1.5cm thick with embedded holeFiber: One Saint-Gobain BCF- 92 1.0 mm diameter Readout: Geiger mode APDs from Hamamatsu and IRST-FBK

Fiber Kuraray T11- 300 ppm shows higher light yield but slower time response

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Tests on scintillator with surface groove instead of embedded hole are under way

R. Calabrese


LYSO and CSILYSO and CSI

The SuperB Experimentsteven/StevenWebFiles/Talks/... · Jun 8, 2008 The SuperB Experiment Steven Robertson, Institute of Particle Physics 11 2001: First concept for a SLAC-based high

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