Presentation on theme: "The Project Francesco Forti, INFN and University, Pisa 18 Marzo 2009 Physics and Detector."— Presentation transcript:
The Project Francesco Forti, INFN and University, Pisa 18 Marzo 2009 Physics and Detector
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore3 Exploration of two frontiers Relativistic pathQuantum path LHC
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore4 Why flavour physics 1.Explore the origin of CP violation Key element for understanding the matter content of our present universe Established in the B meson in 2001 Direct CPV established in B mesons in Precisely measure parameters of the standard model For example the elements of the CKM quark mixing matrix Disentangle the complicated interplay between weak processes and strong interaction effects 3.Search for the effects of physics beyond the standard model in loop diagrams Potentially large effects on rates of rare decays, time dependent asymmetries, lepton flavour violation, … Sensitive even to large New Physics scale, as well as to phases and size of NP coupling constants
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore5 B Factories Success Both B-Factories exceeded expectations Design Lumi PEP-II (BaBar): 477fb -1 Peak: 1.2 x cm -2 s -1 KEK-B (Belle): 754 fb -1 Peak: 1.7 x cm -2 s -1 Total Ldt > 1.2 ab −1 ≈ 1.2 x 10 9 BB ( ) pairs Design Lumi
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore6 (Some) Results from B-Factories New DK state(s) at 2.86GeV/c 2 D s2 (2573) + Spectroscopy of new, unexpected states No Mixing D 0 – D 0 mixing B setting limits on MSSM parameters Unitarity Triangle precision measurements B discovery Extend well beyond the originally envisaged physics program.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore7 Power of Intensity Precision measurements in the flavour sector are sensitive to New Physics (NP) –Intereference effects in known processes –SM Rare or forbidden decays NP effects are controlled by –NP scale: Λ –Effective couplings: C Different coupling intensity (different interactions) Differente patterns (e.g. because of simmetries) With 5-10x10 10 bb, cc, pairs ( ab -1 ) one can: LHC does not find NP(Λ) Look for indirect NP signals Connect them to models Exclude regions in parameters space LHC finds NP(Λ) Determine detailed structure of couplings of NP Look for heavier startes Study NP flavour structure Some channels, such as the LFV decays of are unambiguous signals of NP
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore8 Charm FCNC Charm mixing and CP B (4S) B s U(5S) Physics
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore9 Test of CKM 50 ab-1
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore10 New Physics in F=1 Penguins sin2b in b s penguin transitions differs from that measured in b ccs golden modes. sin2 experimental uncertainty. Theory error on S from penguin mode Theory predicts a positive shift (sign prediction very solid) Experiment shows a negative, albeit marginally significant shift A discrepancy would be sign of NP phase QCDF: (Beneke, PLB620 (2005), , Cheng et al., PRD72 (2005) etc. SCET: (Williamson & Zupan, hep-ph/ )
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore11 N.P. sensitivity An example: MSSM MSSM with non diagonal mass insertion Constraint from Δm d Constraint from sin2β & cos2β Constraint from sin2β All constraints S.M.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore12 NP for F=2 processes B d mixing processes can get contribution from NP They are parametrized by an effective amplitude ratio Huge improvement on limits possible at SuperB. NowSuperB with 75 ab -1
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore13 Minimal Flavour Violation Suppose that there are no new physics flavour couplings(MFV). –CP violation comes from SM Yukawa couplings. –The top quark contribution dominates the SM. –NP contribution is: –MFV Includes many NP scenarios i.e. 1HDM/2HDM, MSSM, ADD, RS. What is the energy scale that we are sensitive to? B Higgs mediated transitions Real Wilson coefficient O (1) New Physics Scale SM Scale ~2.4 TeV 2HDM-II MSSM 75ab -1 2ab -1 LEP m H >79.3 GeV SuperB excludes B-factories exclude M H (TeV) tan
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore14 Lepton Flavour Violation SUSY breaking at low energies should result in LFV : , e are an incredibly rich laboratory SuperB will produce as many ’s as B’s Beam polarization possible magnetic moment measurement SuperB Sensitivity (75 ab -1 ) Different models have very different BR patterns
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore15 *Measurement of D oscillations opens new window to search of CPV in charm. Observation of CPV would provide unequivocal NP signals CPV in charm decays D mixing observed by BaBar and Belle Charm sample at SuperB reduces errors by an order of magnitude Plus, possibility of (3S): in 4 months ~0.3ab -1 1000x CLEO-c, 10x BESIII !!
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore16 Theoretical errors https://agenda.infn.it/getFile.py/access?contribId=6&sessionId=1&resId=0&materialId=slides& confId=163https://agenda.infn.it/getFile.py/access?contribId=6&sessionId=1&resId=0&materialId=slides& confId=163 (talk di Ciuchini)
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore17 Cross section is not everything B-Beam Method Fully reconstruct one the two Bs in hadronic modes –High efficiency: a few per mille –> 10 7 recoil Bs in 10ab -1 Obtain a pure B Beam on the other side –High purity sample –Can look at channels with a lot of missing energy. –For example BR(B nothing) measured. Recoil cinematics well known Recoil flavor and charge is determined Hadron machines do have the advantage of an enormously larger B production cross section, BUT… SuperB has a super-easy ½ track trigger Initial state is coeherent, allowing interference measurements SuperB can do physics. Has access to states with a loss of missing energy
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore18 SuperB and Super LHCb : Sensitivity Comparison ~2020 S-LHCb 100 fb -1 vs SuperB 50 ab -1 B s time dependent analysis only accessible to LHCB No IP, Neutrals,, only accessible to SuperB Common Preliminary LHCb Super B CDF an important player, too. SuperB cannot compete with LHCb on B S physics. –Only time integrated measurements Similar sensitivity for many common channels –SuperB extrapolation based on Babar/Belle experience Unique opportunity for channels with neutrals, n, inclusive measurements –Not accessible at hadronic machines.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore21 Detector Babar and Belle designs have proven to be very effective for B- Factory physics –Follow the same ideas for SuperB detector –Try to reuse same components as much as possible Main issues –Machine backgrounds – somewhat larger than in Babar/Belle –Beam energy asymmetry – a bit smaller –Strong interaction with machine design A SuperB detector is possible with today’s technology –Baseline is reusing large (expensive) parts of Babar –Quartz bars of the DIRC –Barrel EMC CsI(Tl) crystal and mechanical structure –Superconducting coil and flux return yoke. Some areas require moderate R&D and engineering developments to improve performance –Small beam pipe technology –Thin silicon pixel detector for first layer –Drift chamber CF mechanical structure, gas and cell size –Photon detection for DIRC quartz bars –Forward PID system (TOF or focusing RICH) –Forward calorimeter crystals (LSO) –Minos-style scintillator for Instrumented flux return –Electronics and trigger – need to revise Bfactory “½-track” trigger style –Computing – large data amount More details in: –www.pi.infn.it/SuperB/node/159 - SuperB Italy Meeting on detector R&Dwww.pi.infn.it/SuperB/node/159 –indico.lal.in2p3.fr/conferenceDisplay.py?co nfId=167 – Paris workshop (May 9-11)indico.lal.in2p3.fr/conferenceDisplay.py?co nfId=167 –https://agenda.infn.it/conferenceDisplay.p y?confId=163 – Review (Nov 12-13)https://agenda.infn.it/conferenceDisplay.p y?confId=163
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore22 Detector Layout – Reuse parts of Babar BASELINE OPTION
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore23 Two colliding beams –radiative Bhabha dominant effect on lifetime –e+e- e+e- production ~3% contribution to lifetime, important source for SVT layer-0 Single beam –synchrotron radiation strictly connected to IR design –Touschek negligible in BaBar, important in SuperB –beam-gas –intra-beam scattering Machine backgrounds
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore24 Silicon Vertex Tracker The Babar SVT technology is adequate for R > 3cm: –use design similar to Babar SVT Layer0 is subject to large backround and needs to be extremely thin: –More than 5MHz/cm 2, 1MRad/yr, < 0.5%X 0 –Striplets option: mature technology, not so robust against background. Marginal with background rate higher than ~ 5 MHz/cm 2 Moderate R&D needed on module interconnection/mechanics/FE chip (FSSR2) –CMOS MAPS option new & challenging technology: can provide the required thickness existing devices are too slow Extensive R&D ongoing on 3-well devices 50x50um 2 –Hybrid Pixel Option: tends to be too thick. An example: Alice hybrid pixel module ~ 1% X 0 Possible material reduction with the latest technology improvements Viable option, although marginal PRESHAPERDISCLATCH
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore25 Radius, thickness, resolution Technological solutions depend critically on L 0 radius, thickness, resolution Fast simulation studies for various decays have been performed A full, more detailed reassessment is needed for the TDR. 10 m resolution5 m resolution BaBar MAPS MAPS low mass solution would leave more flexibility for radius (ie background) and resolution Hybrid pixels will force to use the smallest radius and/or better resolution Striplets (same MAPS material) require larger radius, performance marginal t resolution in B decays vs L0 X0(%) beam pipe material: 0.4% X0 b. p. inner R 1cm, o.r. 1.1 cm layer0 radii = 1.2, 1.5, 1.7 cm material for L0 = [ ] % X0 hit resolution = [5-15] m
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore26 Developed a light L0 module support with cooling microchannel integrated in the Carbon Fiber support: 0.35 % X 0 –Total support thickness = 0.35 % X 0 –Consistent with the requirements TFD Lab ready in Pisa First thermoidraulic measurements in good agreement with simulation and within specs. ½ MIP SVT- Layer0 R&D Status Successfully tested two options for L0 CMOS MAPS matrix with fast readout architecture (4096 pixels, 50x50 m pitch, sparsification and timestamp) –Hit efficiency up to 92% with room for improvement –Intrisinc resolution ~ 14 m compatible with digital readout. Thin (200 m) 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 Fiber Support with 3 channels 12.8 mm 1.1 mm SLIM 5 CERN (Sept 2008) 90%
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore27 Lighter structure, all in Carbon Fiber (CF) –Preliminary studies show that dome-shaped CF end-plates with X0~2% seem achievable (compare 13-26% in BaBar DCH) Design faster&lighter electronics (taking into account detectors options to be possibly installed behind backward end-plates) To control expected increase in occupancy: –studying faster gas mixtures –considering smaller cells –alternative solutions being explored tapered shape of end-plates Build on B A B AR drift chamber concept: no major R&D effort needed, but: The drift chamber
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore28 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 –But… PMTs are slow and aging. Need replacement. Large SOB region sensitive to backgrounds so volume reduction is desirable Photon detector replacement –Baseline: Use pixelated fast PMTs with a smaller SOB to improve background performance by x with identical PID performance
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore29 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 (>25 cm) Time of flight –Need about 10ps resolution to be competitive with focusing RICH –15-20ps already achieved. Can 10ps be achieved ?
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore30 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
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore31 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 crystals frees 10cm for a forw. PID system radiation hard, fast, small Moliere radius, good light yield expensive (~40$/cc) at the moment –Option 2: retain 3 outer rings of CsI(Tl), LYSO the others less expensive no space for forw. PID system *Backward endcap (option) –Pb plates and scintillating tiles with fiber readout to SiPMs
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore32 Provides discrimination between and ±. Help detection and direction measurement of K L (together with EMC) Composed by 1 hexagonal barrel + 2 endcaps as in BaBar Add absorber w.r.t. BaBar to improve / 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/cm 2 d –single layer or double coord. layout depending on the x-y resolution needs The Instrumented Flux Return
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore33 Electronics, Trigger, DAQ Working conditions –Trigger rate is expected to be of the order of 100 kHz at The sole Bhabha’s background: 50 kHz ? – baseline target rate of about 150 kHz. Issue of safety margin. How much, and where do we put the safety ? –A readout window (1us) has to be foreseen –Synchronous mode preferred. Clock O(56MHz). Clock and Fast Control System –Clock distribution not at all trivial to ensure phase synchronization –Try to use commercial component as much as possible (FPGA) Relying on SLHC development (such as GBT) very risky Try to define strategic placement of components so that radiation damage is kept under control. –Different options to be studied and simulated L1 Trigger – 7MHz Dataflow – Local buffers, overlapping readout windows Frontend model – synchronous, fixed latency Radiation mitigation High Level Trigger and pre-processing boards – input bw O(15MB/s)
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore34 Detector simulation Fast simulation –Parametrized, for evaluating physics impact of detector choices Full simulation –GEANT4 full description, for background effect evaluation
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore36 The SuperB Process (Courtesy of M. Biagini) th Joint Japan-US SuperB-Factory Workshop, Hawaii, US International SuperB Study Group formed 1 st SuperB Workshop, LNF, Italy International SuperB Steering Committee established 2 nd SuperB Workshop, LNF, Italy 3 rd SuperB Workshop, SLAC, US 1 st Accelerator retreat, SLAC, US 4 th SuperB Workshop, Villa Mondragone, Italy SuperB meeting, Daresbury,UK CDR writing started CDR published 5 th SuperB Workshop in Paris, France CDR presented to INFN Management CDR presented to ECFA International Review Committee setup 2 th Accelerator retreat, SLAC, US 1 st IRC meeting, LNF, Italy 2nd IRC meeting, Rome, Italy Accelerator test started at DA NE, LNF, Italy 6 th Physics retreat at Valencia, Spain Detector R&D workshop, SLAC,US ICFA08 Workshop at BINP, Russia 7 th SuperB Meeting in Elba, Italy – IRC REPORT Mini MAC Month CERN strategy group presentation 2 nd Meeting with ECFA ECFA Report INFN Approval of SuperB TDR phase arxiv.org/abs/
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore37 CDR Cost Estimate A full cost estimate of the SuperB project has been done –Based on Babar/PEP-II actual costs –Escalated from 1995 to 2007 –Bottom-up for almost all elements Separate new components from reused elements –Replacement value of reused components = how much would it cost today to rebuild those components (extrapolated from Babar/PEP-II costs) –New costs: everything that’s needed today, including refurbishing –Transport is not included, but disassembly and reassembly is. Keep separate categories: –EDIA: engineering, design, inspection and administration (man-months) –Labour: technicians (man-months) –Materials and Services: 2007 Euros.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore38 Reviews INFN Internation Review Comm –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 + Tatsuya Nakada (RECFA) + Steve Myers – accel expert Report released May 2008 recommend strongly continuation of work for cm -2 s -1 asymmetric e + e - collider RECFA Committee (2008) –Tatsuya Nakada –Yanis Karyotakis –Frank Linde –Bernhard Spaan CERN strategy group (2008) -chair Steinar Stapnes OK: seek government approval DOE Particle Physics Project Prioritization Panel (P5) Report released May 2008 Recommend significant US Participation in offshore flavour factory in the intermediate funding scenario Mini Machine Advisory Commitee –Klaus Balewski (DESY) –John Corlett (LBNL) –Jonathan Dorfan (SLAC, Chair) –Tom Himel (SLAC/ DESY) –Claudio Pellegrini (UCLA) –Daniel Schulte (CERN) –Ferdi Willeke (BNL) –Andy Wolski (Liverpool) –Frank Zimmermann (CERN) First meeting in July 08 No glaring showstoppers Form a management structure
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore39 Comments on reviews Link to meetings and reports: B/reviews Dainton committee Mini MAC Very exciting project -- Committee is exhilarated by the challenge Physics requirement of 10**36 cm-2 sec-1 or 75 ab-1/5yr is very demanding Committee considers the SINGLE MOST ESSENTIAL ingredient for moving forward is the formation of a sanctioned management structure which formally incorporates a dedicated machine design team. The team members must have the strong support of their home institutions to work on the design. The team needs a designated leader, who is as close to full time as is possible The Committee sees no glaring showstoppers wrt achieving the design performance. However, in several key areas, more work is needed before the design can be blessed
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore40 ECFA report *We consider that flavour physics should be seen as an important part of the European research programme of elementary particle physics, complementary to physics provided by the energy frontier experiments. For the coming ~5 years, LHCb will do this job in the b and c quark sectors. To follow-up this progress, collecting 50 ab−1 or more at Υ(4S) energy with e+e− storage rings by the end of the next decade would be a significant milestone, if this can be realised at a moderate cost. *The INFN Super Flavour Factory project team proposes a novel scheme […]. This idea of obtaining a high luminosity with tiny beam spots at the collision point based on very small emittance beams and crab waist collisions could revolutionize the design of the future colliders. Therefore, westrongly support the R&D effort to see if such a machine can really be built. *The current tests at DAFNE are promising and we would like to congratulate the team for this impressive achievement. However, a substantial amount of work is still required for producing a Technical Design Report, […] *Given the complexity of the project, we feel that a clear plan containing realistic technical milestones and resource requirements together with a strategy how to obtain them is needed as a necessary condition for an approval of the project. *Such a plan should aim at obtaining an integrated luminosity of significantly more than 50 ab−1 by not much later than the end of the next decade. Given the very ambitious time scale, a clear decision taking process must be established soon.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore41 INFN Il 19 dicembre il consiglio direttivo ha approvato la stesura del TDR per SuperB – progetto speciale SuperB TDR La regione Lazio contribuirà con un fondo di ricerca di 5M€/anno per tre anni per la preparazione dei Technical Design Report –Ingegneri, progettazione ingegneria civile, finalizzazione progetto di macchina –Possibilità di contratti per personale dedicato –Una parte di R&D per acceleratore e rivelatore –Ancora da capire i dettagli gestionali L’INFN contribuirà sul bilancio ordinario –Bilanci dei gruppi in Commissione I –Fondi per TDR acceleratore
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore42 SuperB Organization Chart for TDR Phase 10/03/2008 Accelerator R&D, Engineering and Construction Accelerator Technical Board Detector R&D, Engineering and Construction Detector Technical Board Site computing system, offline Infrastructure, Facilities, Services Oversight Board International Board of Representatives R&D + Preparatory Studies Linac Magnets Mech. Design IR/Final Focus Vacuum Transfer Lines Alignment Diagnostics Polarization Parameters Optics Beam Dynamics RF/Feedback Fluid Supplies Damping Rings Control System Power Supplies Rad. Protection Tunnel, power, water, utilities, ……… Computing Accelerator Consortium Detector Collaboration Local Infrastructure SVT DCH PID EMC IFR Magnet Offline Computing Online Computing Electronics Trigger DAQ Rad. Monitor Lum. Monitor MDI Computing Model Mini-MAC Mini-DET Mini-COMP SuperB Project Office - TDR Phase Director Deputy Director 1 Deputy Director 2 Deputy Director 3 Administrative and scientific staff Marcello Giorgi David Hitlin David Leith Guy Wormser M.Morandin F.Forti, B.Ratcliff S.Tomassini J.Seeman, P.Raimondi
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore43 Prossimi passi 1.Report(s) necessari per l’approvazione iniziale del progetto da parte del governo Tempistica dettata dalla politica e dalla necessità di far partire gli scavi al più presto E prima che RP finisca come presidente Fine 2009: Technical Description dell’acceleratore Tor Vergata Site Study Un qualche “Design Report” su: rivelatore, computing, physics 2.Report(s) necessari per una review tecnica completa e per l’approvazione delle spese Technical Design Report/Engineering Design Report Acceleratore, Sito, Rivelatore: Fine 2010 Computing: potrebbe arrivare 1-2 anni dopo.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore44 SuperB Location 3 km
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore45 SuperB Footprint SuperB rings
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore46 SuperB Summary and Outlook The physics case for a high luminosity B Factory is clearly established The SuperB accelerator concept allows to reach and exceed the threshold All scientific reviews are positive There is a growing international interest and participation R&D is proceeding on various items TDR phase approved by INFN and Next steps are: –Intermediate report end of 2009 –Government approval –Technical Design Report by 2010 Let’s start digging…
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore49 BABAR (45.7) SUPERB (31.7) Viene da BABAR (61.3) BABARBABAR+SUPERB 69.8 FTE 96 persone 76.7 FTE 106 RIC 36 TEC Manpower INFN
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore50 Asymmetry and beam pipe radius Lower boost advantegeous for machine design –Babar: βγ =0.56, Belle: βγ =0.45 –SuperB: βγ =0.28 we can afford to have a lower boost only if the vertexing resolution is good: –small radius beam pipe –very little material in b.p. and first layer A b.p. with r ~1cm is highly desirable z z vs Vertex separation significance Present Babar value
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore51 Beam pipe 1.0 cm inner radius Be inner wall –≈ 4um inside Au coating 8 water cooled channels (0.3mm thick) –Power ≈ 1kW Peek outer wall Outer radius ≈ 1.2cm Thermal simulation shows max T ≈ 55°C Issues –Connection to rest of b.p. –Be corrosion Outer wall may be required to be thermally conductive to cool pixels
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore52 EMC 6580 CsI(Tl) crystals Instrumented Flux Return iron / RPCs (muon / neutral hadrons) Drift Chamber 40 stereo layers 1.5 T solenoid Silicon Vertex Tracker 5 layers, double sided strips DIRC PID) 144 quartz bars PMs e + (3.1 GeV) e - (9 GeV) SVT: 97% efficiency, 15 m z hit resolution (inner layers, perp. tracks) SVT+DCH: (p T )/p T = 0.13 % p T %, (z 0 ) = 1 GeV/c DIRC: K- separation GeV/c GeV/c EMC: E /E = 2.3 % E -1/4 1.9 % The BABAR Detector
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore53 Pair production Huge cross section (7.3 mbarn) Produced particles have low energy and loop in the magnetic field Most particles are outside the detector acceptance
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore54 Why not an all-silicon tracker
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore56 Accelerator and site costs Note: site cost estimate not as detailed as other estimates.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore57 Detector cost Note: options in italics are not summed. We chose to sum the options we considered most likely/necessary.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore58 Schedule 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.
Mar 18, 2009F.Forti - SuperB Fisica e Rivelatore59 CDR Signatures: some numbers 320 Signatures; 85 institutions 174 Babar members –65 non Babar exper. Signatures breakdown by country