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S u p e r F l a v o u r F a c t o r y How and Why to construct an high luminosity

S u p e r F l a v o u r F a c t o r y How and Why to construct an high luminosity e + e - Super(B)(Flavour) Factory. 444 pages. 320 signers ~80 institutions. Giovanni Calderini (LPNHE) Achille Stocchi (LAL) Alessandro Variola (LAL). S é minaire LAL 25 Avril 2007.

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S u p e r F l a v o u r F a c t o r y How and Why to construct an high luminosity

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  1. SuperFlavourFactory How and Why to construct an high luminosity e+e- Super(B)(Flavour) Factory 444 pages 320 signers ~80 institutions Giovanni Calderini (LPNHE) Achille Stocchi (LAL) Alessandro Variola (LAL) Séminaire LAL 25 Avril 2007

  2. Alessandro will show why “it is possible” to construct an e+ e- asymmetric collider with a luminosity of ~1036cm-2 sec-1 ~15 ab-1/per year (100 times what we have now) and a low background in the interaction region : a Super Flavour Factory (SFF) Giovanni will show which detector we need for fully exploit the physics data coming out from this machine and to perform the physics studies I want to discuss that such SFF is essential for the purpose of studying New Physics in the flavour sector in the LHC era

  3. 1fb-1 ~ 1M BB 1ab-1 ~ 1G BB ~1034cm-2 sec-1 B-factories 2007 Today-2007 Babar (~400fb-1) / Belle(700fb-1) End-2008 2ab-1 SuperB 75ab-1 LHCb ≥2012 SuperB ~1036cm-2 sec-1 Evidence for D0 mixing Observation of direct CP violation in B gp+p- Some achievements at B factories Evidence for B gtn Observation of b g dg Evidence for direct CPV in B g K+p- Discovery of X(3872) Hint at new physics: CPV in B gfKs Observation of B g K(*)ll Observation of CPV in B meson system

  4. B factories have shown that a variety of measurements can be performed in the clean environment. • By doing the work of extrapolating the existing measurements and the ones which will be possible with more statistics we observe that : • Several measurements are statistically limited and so • it is worthwhile to collect >50ab-1 • - The systematic errors are very rarely irreducible and • can almost on all cases be controlled with control • samples. On top of it detector improvements can be crucial for some analyses. Not yet included in the extrapolations B events continuum events D ter. B Thanks to better vertex resolution we can distinguish on vertex requirements B vs continuum events ( ~factor 5 background rejection) sec D prim.

  5. Experimental Reach

  6. The angle b Golden B0 J/y K0 535M Based on the present “savoir faire” sin2b gives the best constraint on r-h plane and the error can still be reduced Dt(ps) Dt(ps) Example other modes : B0 D0 h0 SuperB will be able to make complementary measurements (beyond J/y K0) that help to ensure that the theoretical uncertainties are under control and to control them on data Babar SuperB Important points : - We know how to perform these analyses - Very significant improvement from now2ab-1 Superb luminosity

  7. The angle a rr modes Isospin analyses performed at the B-factories s(a) @ 100 Important measurement because it gives the contributions of Penguins diagram Some very important measurements start to be possible only now with about 0.5ab-1 consistent with no CP violation aeff~90o (0/180)o Each of pp,rp,rr analysis will be allow to get s(a)~2 degrees It allow consistency checks and to control theoretical uncertainties on data SuperB s(a)~1o possible (*) theoretical limited

  8. (4-5)o (<1)o 750pb-1 20fb-1 Best measurements from Dalitz analysis with D0Kspp The angle g The model error can be reduced by running at threshold New D0 decays starting to be explored Error vs DCP statistics BaBar Bondar Poluektov hep-ph/0510246 Many independent methods GLW, ADS, Dalitz, with many different decay channels SuperB s(g)~1o possible

  9. sin2b from “s Penguins”… Many channels can be measured with DS~(0.01-0.04) W- s b SuperB f t s B0d s K0 d d ~ g ~ ~ s b s b (*) theoretical limited

  10. leptonic decay Bln SM expectation Milestone : First leptonic decay seen on B meson First test can be done, not yet precise BR(B → τ ν) = (0.85 ± 0.13)10-4 SuperB Exp. likelihood BABAR+BELLE BR(B → τ ν) = (1.31 ± 0.48)10-4 (+) systematically limited Br(Btn) up to 3-4% (below limited by systematics) Br(Bmn) can be measured with the same precision not limited by syst.

  11. Radiative B decays SuperB • - many measurements on Bsg • - measurements of Br on Brg • measurement of ACP on • exclusive and inclusive modes (+) systematically limited (*) theoretically limited Significant improvement on bdg ACP in inclusive decay at ~0.5% ! (SM~0.5%) • Measurements of Br done • We start to perform AFB measur. SuperB CP and FB asymetries in sll exclusive and inclusive decays at few per cent

  12. Could the SuperB be a Super Flavour Factory ? Which is the interest ?

  13. Charm Physics Charm physics using the charm produced at U(4S) Consider that running 1 month at threshold we will collect 500 times the stat. of CLEO-C Charm physics at threshold 0.2 ab-1 String dynamics and CKM measurements @threshold(4GeV) x~1%, exclusive Vub ~ few % syst. error on g from Dalitz Model <1o D decay form factor and decay constant @ 1% Dalitz structure useful for g measurement D mixing Rare decays FCNC down to 10-8 HFAG preliminary Better studied using the high statistics collected at U(4S) @threshold(4GeV) CP Violation in mixing should be now better addressed

  14. In summary.. g (DK), Vub /Vcb [a(pp,rp,pp)] • superb measurements related to tree level/ ~tree level • (some depending upon LCQD calculations) sin(2b) (Peng.) 2) superb measurements very sensitive to NP Physics AFB (Xsl+l-), AFB (K*g), ACP (K*g), ACP (sg), ACP(s+d)g) BK(*)nn, LFV tmg 3) several quantities depending upon LCQD calculations If Lattice QCD Calculations improve as the related experimental quantities, these measurements will be extremely powerfull Br(B  (r,w),g) Br(B ln), Br(BDtn) 4) <1% UT Fits for New Physics search (all the measurements mentioned before + others..) 5) charm measurements 6) Specific run at the U(5S)

  15. Hadronic matrix element Current lattice error 6 TFlop Year 60 TFlop Year 1-10 PFlop Year 0.9% (22% on 1-f+) 0.7% (17% on 1-f+) 0.4% (10% on 1-f+)  0.1% (2.4% on 1-f+) 11% 5% 3% 1% fB 14% 3.5 - 4.5% 2.5 - 4.0% 1 – 1.5% 13% 4 - 5% 3 - 4% 1 – 1.5% ξ 5% (26% on ξ-1) 3% (18% on ξ-1) 1.5 - 2 % (9-12% on ξ-1) 0.5 – 0.8 % (3-4% on ξ-1)  B → D/D*lν 4% (40% on 1-) 2% (21% on 1-) 1.2% (13% on 1-) 0.5% (5% on 1-) 11% 5.5 - 6.5% 4 - 5% 2 – 3% 13% ---- ---- 3 – 4% Estimates of error for 2015

  16. Phenomenological Impact

  17. In SM Today SuperB+Lattice improvements r = ± 0.0028 h = ± 0.0024 r = 0.163 ± 0.028 h = 0.344± 0.016 about 10 times better (not all measurements yet included…)

  18. The problem of particle physics today is : where is the NP scale L ~ 0.5, 1…1016 TeV The quantum stabilization of the Electroweak Scale suggest that L ~ 1 TeV LHC will search on this range What happens if the NP scale is at 2-3..10 TeV …naturalness is not at loss yet… Flavour Physics explore also this range We want to perform flavour measurements such that : - if NP particles are discovered at LHC we are able to study the flavour structure of the NP - we can explore NP scale beyond the LHC reach

  19. Two crucial questions : Can NP be flavour blind ? No : NP couples to SM which violates flavour Can we define a “worst case” scenario Yes : the class of model with Minimal Flavour Violation (MFV), namely : no new sources of flavour and CP violation and so : NP contributions governed by SM Yukawa couplings. Today L(MFV) > 2.3L0 @95C.L. NP masses >200GeV SuperB L(MFV) >~6L0 @95C.L. NP masses >600GeV As soon as you move from the worst case scenario…

  20. Higgs-mediated NP in MFV at large tanb Similar formula in MSSM. Excl. 2s Bln MH (TeV) BDln Similar to Btn tanb 2ab-1 MH~0.4-0.8 TeV for tanb~30-60 SuperB MH~1.2-2.5 TeV for tanb~30-60

  21. MSSM+generic soft SUSY breaking terms New Physics contribution (2-3 families) • Flavour-changing NP effects in the squark propagator • NP scale SUSY mass • flavour-violating coupling ~ g ~ ~ s b s b 1 10-1 10-2 With the today precision we do not have 3s exclusion In this case the main constraints are bsg In the red regions the d are measured with a significance >3s away from zero ACP(bsg) 1 10 ACP magenta Br(sg) green Br(sll) cyan All constr. blue Today we would have magenta contour covering all the space

  22. NP scale at 350 GeV Due to the actual disagreement between Vub and sin2b we see a slight hint of new physics Re (dd13)LLvs Im (dd13)LL superB if disagreement disapper. SM Re (dd13)LLvs Im (dd13)LL with present disagreement NP at high significance ! Constraint from Dmd Constraint from sin2bcos2b Constraint from sin2bAll constraints

  23. L = 350 GeV

  24. LFV from CKM LFV from PMNS These evaluations do not agree with those given in SuperKEKB : discussion undergoing t physics just discussed this morning by M. Roney 107 BR (tmg) SuperB M1/2 LVF and Littlest Higgs Model

  25. Summary SFF can perform many measurements at <1% level of precision Precision on CKM parameters will be improved by more than a factor 10 NP will be studied (measuring the couplings) if discovered at LHC if NP is not seen at the TeV by LHC, SFF is the way of exploring NP scales of the several TeV (in some scenario several (>10 )TeV..) … and do not forget… SFF is also a Super-Supert-charm factory…

  26. We need to go on in measuring precisely many different quantites ACP(BXg) AFB(BXll) CPV in CF and DCS D decays Br(tmg) …… CKM angles a,b,g Br(Btn) and B Dln |Vub|,|Vcb| radiative decays : Br(Brg, K*g) many other measurements… Could be a nightmare…. I’m sure..will be a dream… Adjusting the central values so that they are all compatible Keeping the central values as measured today with errors at the SuperB

  27. BACKUP MATERIAL

  28. B p l n Progress on Vub.. B Xu l n Exclusive : we start to have quite precise analysis of Br vs q2 Inclusive : improving analyses and improving the control of the theory vs cuts Br ~ |Vub|2 in a limited space phase region… untagged analysis is the most precise Using Babar El, (Xsg) Important that we measure at high q2 where Lattice QCD calculates better. El Confirming disagreement…

  29. Precision measurements of |Vcb| Essential point is to control /“measure” the effects of strong interaction Inclusive Vcb still progress… Same for exclusive.. BD*ln (Babar) Events/0.5 here we extract : limiting factor F(1) BaBar/CLEO/CDF/DELPHI Kinetic scheme Study on charm sector help in the understanding of strong dynamics

  30. Rare decays : SuperB can cover all channels mentionned but Bsmm Unless we perform a long run at the U5S Btn at 4% Bmn at 5% CP asymetries in radiative exclusive and inclusive decays at a fraction of 1% CP and FB asymetries in sll exclusive and inclusive decays at few per cent 13% 2fb1 Only bb back. Linear fit Transv amplit. ?? 18% for 50ab-1 in Jeff

  31. Fit in a NP model independent approach DF=2 Parametrizing NP physics in DF=2 processes No new physics C=1 j=0 Tree processes 5 new free parameters Cs,js Bs mixing Cd,jd Bd mixing CeK K mixing 13 family Constraints 23 family Today : fit possible with 10 contraints and 7 free parameters (r, h, Cd,jd ,Cs,js, CeK) 12 familiy

  32. Model Indep. Analysis in DB=2 C = ± 0.031 f = (± 0.5)o C = 1.24 ± 0.43 f = (-3.0 ± 2.0)o

  33. Run at the U(5S) Possible with the same luminosity Bd(B+) and Bs are produced and can be separated Dominated contribution ~95% BsBs Bs*Bs Bs*Bs* BdBd Bd*Bd Bd*Bd* * Bd,B+ produced with factor 6 less than at U(4S) * Integrated quantities ASL and ACH at less than 0.5% Even a run at 1ab-1 will give less 1% error. BB from B*B produced in C=+1 after BBg decay  some sensitivity to S term in time integrated CP asym. For more details see E. Baracchini et al. hep-ph/0703258

  34. Bit more on Bs Today at Superb C(Bs) ~ 0.026 j(Bs) ~ 1.9o

  35. New Physics contribution (1-3 families) Example on how NP parameters can be measured |d13|LL 1 10-1 SuperB Today 1 10 With the today precision we do not have 3s exclusion In the red regions the d are measured with a significance >3s away from zero Dmd magenta ASL green b cyan All constr. blue

  36. Let’s be more quantitative How to read this table, two examples. At the SuperB we can set a limit on the coupling at The natural coupling would be 1 we can test scale up to we can test scale up to SuperB will probe up to >100 TeV for arbitrary flavour structure! All this number are a factor ~10 better than the present ones

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