marcello a. giorgi università di pisa & infn pisa november 27,2009 plenary ecfa cern

Marcello A. Giorgi 1

Marcello A. GiorgiUniversità di Pisa & INFN Pisa

November 27,2009Plenary ECFA

CERN

The status of Project

27 November,2009

http://www.unipi.it/princ.html

SuperB is a project sustained by an international collaboration aiming at a regional project:

• the construction of a very high luminosity (1036 cm-2 s-1) asymmetric e+e- Super Flavor Factory, with location, inside or near the INFN Frascati National Laboratory.

• A Conceptual Design Report, signed by 85 Institutions was published in March 2007 (arXiv:0709.0451 [hep-ex])

• A TDR is now under construction to be ready by end 2010. An Intermediate Document ( White Paper) in the next few months.

SuperB: a ≥1036 cm-2 s-1 e+ e- collider

27 November,2009 2Marcello A. Giorgi

27 November,2009 Marcello A. Giorgi 3

Previous presentations of the Project

Manchester (‘07) :

Lisbon (March’08) :

CERN (Nov’08):

REPORT BASED ON CDR

Some Highlight on Physics ProgramQuick update on DetectorAccelerator : preliminary results from test on SuperB concepts in DaFne upgrade at LNF.

Quick update on Physics Program and DetectorAccelerator test resultsUpdate on Process and Organization for TDR

320 SignaturesAbout 85 institutions174 Babar members

65 non Babar.


To New Physics BSM with Super Flavor Factories

• The factories program complementary to LHC and LHCb.The optimum is the global approach :• Direct evidence: Energy frontier (look for peaks) • Indirect : Flavor (look for rare or forbidden processes)

Quark Sector (b,c) Lepton Sector (LFV in charged leptons, CPV in t, g-2,neutrinos)

EDM

Astroparticle and non accelerator Physics

27 November,2009


• The factories program complementary to LHC and LHCb.The optimum is the global approach :• Direct evidence: Energy frontier (look for peaks) • Indirect : Flavor (look for rare or forbidden processes)

Quark Sector (b,c) [Golden modes B→t n and B→s g] Lepton Sector (LFV in charged leptons, CPV in t, g-2,neutrinos)

EDM

Astroparticle and non accelerator Physics

27 November,2009

Accessible to Factories

To New Physics BSM with Super Flavor Factories

27 November,2009 Marcello A. Giorgi 6

CKM precision measurements

1 ab-1 50 ab-1


Charm FCNC

Charm mixing and CPB Physics @ Y(4S)

Bs Physics @ Y(5S)t Physics

27 November,2009


Br(Bd K n n) – Z penguins and right hand current

nn KB

)(, ** nn SKKKB

h

e

~[20-40] ab-1 are needed for observation>>50ab-1 for precise measurement

SM

today

If these quantities are measured @ <~10% deviations from the SM can be observed

Only theo. errors

27 November,2009

Marcello A. Giorgi9

CP Violation in charm from mixing

NOW

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Marcello A. Giorgi10

CP Violation in charm from mixing

NOW

SuperB

27 November,2009


Charm

• Charm events at threshold are very clean: pure DD, no additional fragmentation

• High signal/bkg ratio: optimal for decays with neutrinos.• Quantum Coherence: new and alternative CP violation

measurement wrt to (4S). Unique opportunity to measure D0-D0 relative phase.

• Increased statistics is not an advantage running at threshold: cross-section 3x wrt 10GeV but luminosity 10x smaller.

• SuperB lumi at 4 GeV = 1035 cm-2s-1 produces ~109 DD pairs per month of running. (using Cleo-c cross-section measurement [s(e+e-D0D0)~3.6 nb ] +[ s(e+e-D+D-)~2.8 nb] ~ 6.4 nb)

• Super tau-charm could well study mixing and CP violation direct/indirect , but not in time dependent analysis as done in in B factories.

• Time-dependent measurements at 4 GeV only possible at SuperB to extract weak Phase thanks to the improved time measurement and to the option of running at charm threshold.

27 November,2009

Parameter Requirement CommentLuminosity (top-up mode) 1036 cm-2s-1 @

U(4S)Baseline/Flexibility wit headroom at 4. 1036 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 t threshold to U (5S)

For Charm special runs……

Minimum boost bg ≈0.28 ≈(4x7 GeV)

1 cm beam pipe radius. First measured point at 1.5 cm

e- Polarization 60-85% Enables t CP and T violation studies, measurement of t g-2 and improves sensitivity to lepton flavor-violating decays. Detailed simulation, needed to ascertain a more precise requirement, are in progress.


PARAMETER REQUIREMENTS FROM PHYSICS

13

SuperB parameter list (updated July 2009)

27 November,2009 Marcello A. Giorgi


Crabbed waist is realized with a sextupole inphase with the I P in X and at / 2 in Y

2sz2sx

z

x

2sx/

2sz*

e-e+bY

1. Large Piwinski’s angle F = tg(q)sz/sx

2. Vertical beta comparable with overlap area by sx/q

3. Crab waist transformation y = xy’/(2q)

Machine concept : (Crab Waist in 3 Steps)

1. P.Raimondi, 2° SuperB Workshop, March 20062. P.Raimondi, D.Shatilov, M.Zobov, physics/0702033

27 November,2009


2sz

2sx

z

x

sx

2sz*

e-e+bY

27 November,2009

SuperB Site independent now also @ LNF


Polarization included

Damping ring

Collider hall




5.8 m

Damping ring

Collider hall




Collider Hall (12x30m)

area for cooling towers

Existing BuildingGuesthouse

2 “SLAC type buildings” (20x35m) housing 6 klystrons each plus magnet power supplies

Electrical Substation upgradable up to 2x63MVA transformers


Geological Survey



Measurements made by a team of :LAPP Annecy,LNF and PisaVIRGO

SuperB expected LUMI

With 7th year integrated Luminosity can grow at rate of 40 ÷ 60 ab-1/year

Integrated Luminosity(1/ab)

0.00

20.00

40.00

60.00

80.00

100.00

120.00

140.00

>80ab-1 after 6 years

Peak Luminosity (10^35)

0.00

5.00

10.00

15.00

20.00

25.00

30.00


Background Issue : sourcesCross section Evt/bunch xing Rate

Beam Strahlung ~340 mbarn ( Eγ/Ebeam > 1% ) ~850 0.3THz

e+e- pair production ~7.3 mbarn ~18 7GHze+e- pair

(seen by L0 @ 1.5 cm) ~0.07 mbarn ~0.2 70 MHz

Elastic Bhabha O(10-4) mbarn (Det. acceptance) ~250/Million 100KHz

Υ(4S) O(10-6) mbarn ~2.5/Million 1 KHz

Loss rate Loss/bunch pass Rate

Touschek (LER) 4.1kHz / bunch (+/- 2 m from IP) ~3/100 ~5 MHz


radiative Bhabha dominant effect on lifetime Two colliding beams :

e+e- e+e- production important source for SVT layer-0

synchrotron radiation strictly connected to IR design Single beam : Touschek negligible in BaBar, important in SuperB beam-gas intra-beam scattering

Collimators, dynamic aperture and energy acceptance optimization solve the problem of Touschek Background in LER

Beam StrahlungSingle shared QD0 (conventional design):the beam lines are displaced w.r.t. the quadrupole magnetic axis. The off-energy particles are diverted into the vacuum chamber producing bkg. Double QD0 (Siam Twins Quadrupoles):the beam lines are tilted w.r.t. the quadrupole magnetic axis. Only the softer particles produces bkg. (smaller rate, easier shielding)

CDR: QD0 shared by HER & LER

Mike SullivanMike Sullivan

Double QD0 for HER & LER


QD0: Siam Twin Design

Iron Free SC quadrupole: 120 T/m (HER) 52 T/m (LER)

Sim. 2D

Total Field

Left Coil Field

Right Coil Field

External coil

Left

External Coil Field

Right

The desired linear fields are produced by the superposition of the inner and outer fields of the coils determined in 2D in algebraic way.

3D Finite elements analysis (Tosca) shows good field quality (Sextupole less than 10-4 w.r.t. the quadrupole @ r = 1 cm to be further optimized)

Challenging design: Prototype construction will start in 2010

Simona Bettoni

Eugenio Paoloni


Pair Production

The detector solenoidal field is the main trap to keep low pt particles away from the detector

Geant 4 simulation to predict the rate on Layer0 in progress

Preliminary : 7.8 MHz/Cm2 crossings in L0 (300mm Si)

7.3 mbarn

Dominant Feynmangraph

gamma

gamma gamma

e+

e-

Geant4 Sim

SVT Layer 0

Beam pipe

Riccardo CenciSVT Layer 0 radius (cm)

Trac

k ra

te (H

z/cm

2 )

Generator level predictions

SuperB L0 at 13 mm & Beam pipe at 10 mm (1mm Be 5 mm Au)

No Beam Pipe : CDR


• Developed a light L0 module support with cooling microchannel integrated in the Carbon Fiber support:– Total support thickness = 0.35 % X0 – Consistent with the requirements

• TFD Lab ready in Pisa• First thermoidraulic measurements in

good agreement with simulation and within specs.

½ MIP

DETECTOR: SVT- Layer0 R&D Status Successfully tested two options for L0 • CMOS MAPS matrix with fast readout

architecture (4096 pixels, 50x50 mm pitch, sparsification and timestamp)

– Hit efficiency up to 92% with room for improvement

– Intrisinc resolution ~ 14 mm compatible with digital readout.

• Thin (200 mm) striplets module with FSSR2 readout chips

– S/N=25, Efficiency > 98% • First demostration of LVL1 capability with silicon

tracker information sent to Associative Memories

MAPS Hit Efficiency vs threshold

Carbon FiberSupport with 3 channels

12.8 mm1.1 mm

SLIM 5 Testbeam @ CERN (Sept 2008)

90%


DETECTOR: Particle Identification

• Hadronic PID system essential for P(,K)>0.7GeV/c (use dE/dx for p<0.7GeV/c)

• Baseline is to reuse BaBar DIRC barrel-only design– Excellent performance to 4GeV/c– Robust operation, Elegant mechanical support– Photon detectors outside field region– Radiation hard fused silica radiators

• Photon detector replacement– Baseline: Use pixelated fast PMTs with a smaller SOB to

improve background performance by x50-100 with identical PID performance


DETECTOR: Forw/Back PID option

• Extending PID coverage to the forward and backward regions has been considered

• Possibly useful, although the physics case needs to be established quantitatively

• Serious interference with other systems– Material in front of the EMC– Needs space

• cause displacement of front face of EMC

Technologies• Aerogel-based focusing RICH

– Working device– Requires significant space (15

cm) and thickness (about 28%X0)

• Time of flight– Need about 10ps resolution to

be competitive with focusing RICH

– 15-20ps already achieved.


DETECTOR: The electromagnetic calorimeter

* Barrel* BaBar barrel crystals not suffering signs of radiation damage. They’re

sufficiently fast and radiation hard for SuperB needs They can be reused. (Would have been) most expensive detector

component* Background dominated by radiative Bhabhas. IR shielding design is

crucial* Endcaps

* Best possible hermiticity important for key physics measurements* New forward endcap* backward endcap is an option

BaBar Barrel 5760 CsI(Tl) Crystals

Essential detector to measure energy and direction of g and e, discriminate between e and p, and detect neutral hadrons


DETECTOR: Forward and backward EMC

* Forward endcap– BaBar CsI(Tl) endcap inadequate for higher rates and radiation

dose of SuperB• Need finer granularity• Faster crystals and readout electronics• comparable total X0

– Option 1: LYSO crystalsfrees 10cm for a forw. PID systemradiation hard, fast, small Moliere radius, good light yieldexpensive at the moment, although reduction possible

– Option 2: retain 3 outer rings of CsI(Tl), LYSO the othersless expensiveno space for forw. PID system

* Backward endcap (option)– Pb plates and scintillating tiles with fiber readout to SiPMs


• Provides discrimination between m and ±. Help detection and direction measurement of KL (together with EMC)

• Composed by 1 hexagonal barrel + 2 endcaps as in BaBar• Add absorber w.r.t. BaBar to improve /m separation. Amount and

distribution to be optimized– 7-8 absorber layers– reuse of BaBar IFR iron under evaluation

• Use extruded scintillator a la MINOS coupled to geiger mode APDs through WLS fibers

– expected hit rates of O(100) Hz/cm2d– single layer or double coord. layout depending on

the x-y resolution needs

DETECTOR: The Instrumented Flux Return


Detector simulation


• Fast simulation– Parametrized, for evaluating

physics impact of detector choice

• Full simulation (Bruno)– GEANT4 full description, for

background effect evaluation

Marcello A. Giorgi

Detector Geometry Working Group

• forward PID device between DCH and EMC• backward EM calorimeter• SVT/DCH transition radius, internal geometry of SVT• amount and distribution of absorber in IFR• Effects of energy asymmetry.

Group setup to quantify the impact of several detector options/parameters, including:

Golden mode for a given scenarioNon-golden, but still sensitive to deviations from the SMrequires high precision on CKM parameters (obtainable with SuperB)-CKM:

tmg

+ “Breco”: reconstruction of flavour-tagging B decays is crucial ingredient for SuperBphysics program

+ possibly include channel at Psi(3770)

work startedon these channels

Strategy: study the impact of detector options on a set of key measurements

27 November,2009 36

Marcello A. Giorgi

Detector configurations

Main tool: fast simulation generate/simulate/reconstruct physics eventsanalysis tools inherited from BaBar

bg=0.280

30cm space estimatefor DCH electronics

EMCsolenoid

IFR

DCH

SVT

DIRC

bwd EMCfwd PID

examples of simulated detector schemes

27 November,2009 37

Computing

• FastSim: used for physics studies


Marcello A. Giorgi 3927 November,2009

Process: Before 2009


Process: Reviews

27 November,2009

Since 2007 the Project: Physics motivation and Machine Design have been revewed by several International committees:CDR (Physics and concepts) by•IRC (J.Dainton Chair)•ECFA appointed committee (T.Nakada Chair)Machine (design , progress and organization for future steps) by•Mini-Mac (J.Dorfan Chair)

No one has identified any showstopper preventing the accomplishment of the project.From J. Dorfan report of MINI MAC April 24,2009…. “Mini-MAC now feels secure in enthusiastically encouraging the SuperB design team to proceed to the TDR phase, with confidence that the design parameters are achievable”

SuperB is now in TDR phase with commitment:• TDR delivery end 2010• Shorter White Paper end 2009


The President of INFN has presented the SuperB as a regional project in the European Strategy session of Cern Council.

End July 2009- The Italian Minister of Science has presented the SuperB proposal for funding to the Economic Ministers Committee (CIPE)

Process: 2009




Process: 2009




Process: 2009

Wait decision about funding!!

END


marcello a. giorgi università di pisa & infn pisa november 27,2009 plenary ecfa cern

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