The SuperB Project

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The SuperB Project. Marcello A. Giorgi Universit di Pisa INFN Pisa. Outline. Introduction The physics case in the era of LHC Accelerator : SuperB is not just an upgrade of the present BFactories it is a: SUPER FLAVOR FACTORY The Detector The process. Successful Flavour Physics. - PowerPoint PPT Presentation


  • The SuperB Project Marcello A. Giorgi Universit di Pisa INFN Pisa

  • OutlineIntroductionThe physics case in the era of LHCAccelerator : SuperB is not just an upgrade of the present BFactories it is a:


    The DetectorThe process

  • Successful Flavour PhysicsGreat results in Flavor Physics have been obtained in the past few years both in the lepton and hadron sectors.PEPII and KEKB BFactories together with K and neutrino experiments have played an important role .Direct CP violation in K sector, ruling out superweak models, was firstly established at Cern in Na31 and Na48 experiments .Babar and Belle have discovered CP violation in b sector and measured sin2b in 2001, the direct CP violation in B decay in 2004, and the mixing in 2007.

  • Great success of accelerator physicsDesign LumiDesign LumiTotal > 1.1ab1KEKB (Belle)PEP-II (BaBar)400fb-1710fb-1

  • Before BfactoriesNOW!One example of CKM information coming only by sides measurementsCKM Unitarity Triangle

  • CP Violation and the Unitarity TriangleLength of each side ~ O(l3)The Unitarity TriangleSides are determined from the rates for various processesAngles are determined from CP-violating asymmetriesArea is proportional to the amount of CP violation

  • NOT ONLY B! DsJ and many other intriguing new particles ICHEP06 Evident new resonance at 2.86GeV/c2 Hints of a broad state at 2.69GeV/c2Hot topic 2004:Mass and width are far from predictedNew DK state(s) at 2.86GeV/c2Ds2(2573)+??eeJ/ X(3940)eeY(4350)X Y Z

  • Most recent the D0 MIXING in Babar and Bellex= (0.85+0.32-0.31)% y= (0.71+0.20-0.22)% (HFAG- D.Asner)cosd = 0.40+0.23-0.31 x=0,y=0 is excluded at 5 sCPV is indication of NP as x>>yL=380 fb-1No Mixing

  • The Physics caseDATA SAMPLE: 510 1010 B Bbar pair and a same order of t and c-cbar pair.Possibility of special runs with luminosity 1035 cm-2 s-1 at Ecm=4GeV.Possibility of at least one polarized beam.

  • SuperB Physics caseThere is a solid case for a SuperB collecting between 50 and 100 ab-1 ( 5. 1010 -10 11 B, charm, t pair)Precision measurements allowing to detect discrepancies from the standard modelReduced theoretical uncertainties will allow this in many channelsRare decay measurementsLepton flavour violation, Tviolation in tau, tau anomalous magnetic moment.In addition: possibility to run at tau/charm threshold, polarized beamComplementarity 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)See in addition to SuperB CDR: The Discovery Potential of a Super B Factory (Slac-R-709)Letter of Intent for KEK Super B Factory (KEK Report 2004-4 )Physics at Super B Factory (hep-ex/0406071)SuperB report (hep-ex/0512235)Many documents available at the URL : BUT MORE IMPORTANTTHE UNEXPECTED DISCOVERY FROM A FRONTIER MACHINE

  • UTfit as now and with SuperB1 ab-150 ab-1Triangle vertexDetermined by processesWith 50 ab-1 g is measured at 1 levelTheoretical uncertainties on sides could be reduced: (V.Lubicz, SuperB IV Villa Mondragone nov.2006)Vub : 2% (excl.) 2% (incl.)Vcb : 1% (excl.) 0.5% (incl.)

  • WHERE from NP?NewphysicsQuark sectorLepton sectorEnergy frontier LFV,t CPV












  • The case for a high luminosity flavour factoryPrejudice: if there is New Physics at the TeV scale it must have a flavor/CP structure New heavy quanta can be detected through precision measurement of processes involving loop diagramsStatistics of O(50 ab-1) is necessary to reduce the experimental error below the theoretical uncertainty for the most sensitive analyses Physics reach is complementary to LHC-LHCb: many rare decays are not accessible at LHC; sensitivity to off-diagonal term of squark mixing matrix, test of LFV , CP violation studies and anomalous magnetic moment measurements in t , also thanks to the beam polarization.


    DF=1DF=2LFV in t , t magnetic structureCP and CPT in t

  • DF=1ICHEP06: b from b g s PenguinsNave average of all b g s modessin2beff = 0.52 0.052.6 s deviation betweenpenguin and tree (b g s) (b g c) More statistics crucial for mode-by-mode studies!

  • NP in Box Diagram (Mixing/FCNC)Contributions BSM can show in these processes. If prametrise with amplitude C and phase f DF=2 mixing process, C=1 an f=0 are in SM

  • Present constaraints on NP for DF=2 processesFrom Bd mixingNowSuperB with 75 ab-1zoooom

  • Various hypothesis on NPMinimal Flavor Violation:No NP couplings with FlavorCP violation from SM Yukawa couplings

    Several NP scenarios in MFV:1HDM/2HDM,MSSM, ADD, ..MFV sensitive up to 6 L0 (14 TeV)Doesnt require to match L of EWBS. 2HDM allows for Btn NPwith small tanb at m

  • B leptonic decays Test of t/m universalityO(10%) Enhancement in GUT-SUSY modelsPrecision with 50 ab-1 at SuperB ~ 7% Paradisi, Masiero, Petronzio 05, Isidori, Paradisi 06Large tanb makes possible search above several TeV

  • Lepton Flavor Violation in t decay

  • t CP ,CPT violationA.Bevan Hadron 07 (oct.2007)

  • D0 mixingRecent measurements from Babar and Belle demonstrated Bfactory capabilities in charm physicsPossibility to measure CP violation in the charm sector 1month

  • Physics reach on B mesons at SuperBFrom 05 T.Iijima talk5ab-1 SuperB50ab-1 SuperB2fb-1 LHCbCPV (bs)FCNCW/nCKM

  • Super B factory and Super LHCb:Sensitivity Comparison ~2020LHCb 100 fb-1 vs Super-B factory 50 ab-1SuperB numbers fromM Hazumi - Flavour in LHC era workshop; LHCb numbers from MuheimCDF numbers from RistoriBs time dependent analysis only for LHCBNo IP, Neutrals, , only for SuperBCommonLHCbSuper BCDF an important player

  • The e+ e- machine

  • e+e- collidersM.Biagini EPS 07

  • Summary from Oides talk at 2005 2nd Hawaii SuperBF WorkshopPresent design of SuperKEKB (SAME CONSIDERATIONS FOR PEPII) hits fundamental limits in the beam-beam effect and the bunch length (HOM & CSR)1. Higher current is the only way to increase the luminosity .Many technical and cost issues are expected with a new RF systemWe need a completely different collider scheme.....

    1High order modes, Coherent Synchrotron Radiation Just increasing the current of PEP-II/KEKB is expensivewall powerdetector background explosioneffective limitation on present detector technology around 5x1035

  • Basic conceptsB-factories reachs already very high luminosity (~1034 s-1 cm-2 ). To increase of ~ two orders of magnitude (KeKB-SuperKeKB) it is possible to extrapolate the requirements from the current machines:

    Parameters :Higher currentsSmaller damping time (f(exp1/3))Shorter bunchesCrab collisionHigher Disruption Higher powerSuperKeKB Proposal is based on these conceptsIncrease of plug power ($$$$$..) and hard to operate (high current, short bunches)look for alternatives keeping constant the luminosity => new IP scheme: Large Piwinsky Angle and CRAB WAIST SuperKEKB (3 factors to High Lumi)

  • A new idea... Ultra-low emittance (ILC-DR like)Very small b at IPLarge crossing angleCrab Waist schemeSmall collision areaLower b is possible

    NO parasitic crossingsNO synchro-betatron resonances due to crossing angleTest at DAFNE this November !!!

  • Large crossing angle, small x-sizeWith large crossing angle the x and z planes are swapped(1) and (2) have same Luminosity, but (2) has longer bunches and smaller sx1) Head-on,Short bunches2) Large crossing angle, long bunchesLarge Piwinski angle: F = tg(q)sz/sx

  • IP beam distributions for KEKBIP beam distributions for SuperBAn example...

    KEKBSuperBI (A)* (mm)60.3bx* (mm)30020sy* (mm)30.035sx* (mm)806sz (mm)65L (cm-2s-1)1.7x10341.x1036

  • SuperKEKB schemeSuperKEKB is a more conventional machine, with a maximum peak luminosity that can approach 1036 cm2 s-1 , but high circulating current is driving a wall power 80 MW and some severe limitation on detector due to the background. Good relations between SuperB and SuperKEKB communities.( Simulation of SuperB made at KEK, cross participation at the workshops..)

  • Comparison between machines

  • Machine parametersPresent parameter set based on ILCDR-like parameters 3.0 Km long rings studied with ILC OCS (Baseline) lattice scaled to 4 and 7 GeV Same DR emittancesSame DR bunch length 1.5 times DR bunch chargesSame ILC-IP betasCrossing angle and crab waist to maximize luminosity and minimize blowupTest will start in Nov 2007 on DAFNE.Use PEP-KEK DR damping time 17msFewer and lower field wigglers usedFinal Focus (ILC-like) includedDesign based on recycling all PEP-II hardware, Bends, Quads and Sexts, and RF systemCorresponds to a lot of moneyMaximize Luminosity keeping low DE and wall power.Total power: 35 MW, as in PEP-IISimulations performed in many places and different codes:LNF,BINP,KEK,LAL,CERN

  • M. Zobov, D. Shatilov UpgradeableNumber of particles/bunchSuperB can operate at 4.0 GeV c.o.m Energy at luminosity 1035A preliminary estimate of Wall Power is non unreasonableCurrent as is now in PEPII (can manage Background !)One polarized beam (e-) is considered for tau edm and CP studies The possibility of adding polarized positron is under study.LUMINOSITY is upgradeable

  • The De