Present and Future of B physics

1. (r,h) a g b (1,0) (0,0) Present and Future of B physics Riccardo Faccini Univ. “La Sapienza” & INFN Rome WIN’03 6-11 Oct, 2003 B physics discussions of working group III + miscellanea

2. Outline • Probing SM with B decays: The present • Angles of the Unitary Triangle • Sides of the Unitary Triangle • Rare B decays • Miscellanea • t physics • muon g-2 • Probing SM with B decays: The Future New ideas Recent developments Future perspectives

3. Vub measurement b→uln B→pln, rln,… B(s)-B(s) mixing B→rg/B→K*g Vtd/Vts B→J/Y Ks b→cln B→D*ln B→f Ks Vcb measurement The Unitarity Triangle & B Decays B→pp B→rp Bs→KK (a) (g) (b) B→DK Bs →DK Bd →Dp B→pp/Kp

4. Measurement of Angles

5. CP CP violation in mixing and decay mixing f is not necessarily a CP eigenstate decay Consider B decays to a mode f interference between mixing and decay Mixing phase Examples:

6. s d c s c c c b b b b b s s d Measurements of b Talk from K.F. Chen Charmonium K0 Penguin and tree have the same weak phase J/Y c c B0 K0 d d d d D(*)D(*) and J/Yp0 Penguin and tree have different weak phases: asymmetry not necessarily = sin2b D(*)+ c c D(*)- B0 d d d d fK0 and h(‘)K0 Mostly penguin. In principle measures sin2b, but sensitive to new physics f s K0 d d

7. What’s new SfKs=-0.14±0.33 is 2.7s from SJ/YKs But it is unclear if you can combine them Important area to keep an eye upon [and do Dalitz analysis]

8. Talk from K. Huitu What if it is New Physics? SUSY contributions: For the amplitude SUSY CP violating phase We write CP conserving strong phase 12=0

9. Right Handed (New Physics) Currents Talk from A. Kagan • We could probe right handed currents in B physics with • CP asymmetries in final states with different parity (VV,AV,PP,PV). E.g. important new measurement of Ksp0, but need to look also for f0Ks • Perform transversity analysis in VV modes (e.g. fK*). G>>G‖ would signal new physics (hints in fK*) • Measurements of triple products in VV modes can be hints of new physics but not necessarily with opposite chirality.

10. u u d b b d Measurements of a p+p- , r+p- , p+p-p0,rr Penguin and tree have different weak phases: asymmetry measures sin2aeff p+ u u p- B0 d d d d From sin2aeff to sin2a • p+p- , r+p- require isospin analysis • Long term:3-body dalitz analysis. Penguin to Tree ratio is fit in each point of the Dalitz plot

11. p+p- progresses • Old recipe: • Fit Spp and Cpp • Measure Br(Bpp0) and Br(Bpp) • Set an upper limit on Br(Bp0p0) • … and find the limit on Spp– l sin2a But …

12. … Bp0p0 IS NOT small !!!!! Talk from M. Cristinziani Belle BaBar Current WA: Now we need ACP(p0p0)  current error ~0.3

13. More recent developments Talks from M. Cristinziani and S. Swain CPV in r+p- decays (with hints of direct CPV) • measurement of several rp BF • Starting 3-pion Dalitz analysis • Studying rr events

14. u s d c c d b b b d c s No Penguin No Cry Talk from S. Rahatlou M. Ciuchini Measurements of g • Contributions from bu transitions bring a dependence of CPV from g • Measure g directly in direct CP asymmetries & B+ decay rates • Measure 2b+g with CPV in mixing • Two cases A1~l2c A2~l4c d sin2b+g: A2 doubly cabibbo suppressed D(*)- p+ u b u B0 B0 p+ D(*)- No theo hypothesis whatever d d A1~l3c A2~l3c sing: A2 colour suppressed K(*)+ D(*)0 u c B= D(*)0 B0 u u K(*)+ u u

15. r-h constraints from D(*)p What’s new? Evidences of from D(*)K(*)0 BaBar

16. What’s new? Several B-D(*)0K- analyses + D0K- (D03 body Dalitz) from Belle Talk from S. Swain Lots of techniques, lots of fantasy, lots of fun!

17. Talk from K. Ecklund This program requires CLEO-c Monte Carlo D0pln Tagged Events & Low Bkg D0 Kln Emiss - Pmiss Stringent test of theory Dalitz analysis needed for DK studies Phase I II III

18. Talk from M. Neubert Charmless B decays and g • QCD factorization make a lot of PP and PV B decays accessible to a systematic theoretical treatment • Few parameter handles need to be adjusted (in particular mst hadronic decays?) • When are we going to get VV calculations (such as rr)?

19. g at hadron colliders • The presence of the Bs meson opens a brand new set of interesting probes of gamma • BsDsK is the theoretically cleanest measurement of g • The measurement of g with BsKK is not theoretically clean (U-spin is not conserved), but it is a good initial measurement Talk from P. Rapidis

20. Measurement of Sides

21. Talks from I. Bizjac, T. Brandt, R. Poling, and M. Rotondo BXln transitions • Semileptonic B decays provide pure method for determination of |Vcb| and |Vub| • theoretical framework : OPE / HQE • Now sensitive to b-quark motion inside meson: • b quark mass „L“ • nonperturbative QCD parameters • (-) kinetic energy squared of b-quark in B-meson „l1“ • consistency checks of OPE / HQE • Reaching precision level high sensitivity to theoretical uncertainties

22. PRELIMINARY BXcln transitions From the mX and El distribution we can infer the B quark motion and measure Vcb high mass final states Mx2[GeV2/c4] (p* >0.9 GeV/c) Y(4S) (p>0.5 GeV/c E>0.5 GeV) |Vcb|=0.0416(1±0.017|exp±0.010|G(B)±0.015|HQP) Request: need higher moments I. Bigi A. Stocchi

23. B D(*)ln and Vcb Request: need to remeasure the D*ln form factors (only CLEO)

24. BXuln transitions • Study the high tail of the lepton spectrum  systematics from extrapolation Exploit the fact that the motion is supposed to be the same in BXsg decays Request: separate B0 and B±

25. Exclusive BXuln decays Bl (pl > 1.0 GeV/c) • Several new techniques are being developed • wln from Belle • Q2 dependence from CLEO • Fully reconstructed tags from BaBar • Request: • Form factor measurement (i.e. good q2 resolution) CLEO

26. Talks from I. Bigi Perspectives in semileptonic decays • Vcb from BDln as a cross check • If check successful look for new physics in BDtn • Vub with q2 cuts not so wise since sum rules cannot be applied any more • Least possible cuts and shape function from b sg (but down to 1.8 GeV!!!!) • dVub could go down to 5% • You can get the useful info also from moments but you need to go to higher ones Overconstraints most powerful protection against ignorance Lenin’s dictum: “Trust is good -- control is better!”

27. Talks from S. Burdin and G. Gomez-Ceballos Mixing measurements • Measuring DMd with great accuracy will be worthwhile once DMs is measured (the ratio is less sensitive to theory) • D0: 2 fb-1, Dms = 15 and st = 150 fs • Single muon trigger: Bs Dsm X (3.5 s), Bs Ds e X (3.5 s),Bs Dsp (2.2 s), m in the other side • Dimuon trigger: Bs Dsm X (3.0 s), m in the other side • CDF: • Dms = 15, 2 s limit with 0.5 fb-1 • Dms = 18, discovery with 1.7 fb-1 • Dms = 24, discovery with 3.2 fb-1 Projections from current lumi: ~100-150 pb-1 Also several lifetime measurements were shown

28. Talks from H. Deng, K. Inami, and K. Tobe g-2 and tmg Susy tmg close to reach dam= (22±7 ± 4±8)10-10 [CDM-2 & CLOE] = (7±6 ± 4±8)10-10 [t] m- still blind (will have an error of 0.6 ppm)  test CPT dμ< 2.8×10-19e·cm (95% CL) m electric dipole moment

29. The Future of B physics

30. Talk from J. Hewett The case for higher luminosity While LHC will tell the existence of new physics, B-machines will tell the flavour structure of it. New Physics Parameter Space Tools for Probing New Physics  LHC • Consistency among angles & sides of U.T., Bs-Mixing, K physics • Comparison of CP Violation in different channels sin 2 via B  Ks, Ks, ’Ks, K+K-Ks sin 2 via Bd  DK, Bs  DsK • Rare Processes Decays B  Xs/d, Xs/dll, l+l-, Xs AFB in B  Xsll CP Asymmetries in B  Xs/d, Xs/dll D-Mixing  • Standard Model Zeros • Patterns of distinguishing New Physics - B-Physics ~ TeV Mass

31. Talk from U. Haisch and S. Nishida A detailed example: Xs,dll Belle • No tree level in SM  very good probe of new physics • Present measurements of Branching Fractions agree with theory • Real discovery power in AFB and mll

32. L~1036 dt =3000fb-1 L=1035 Present KEKB L=1034 dt =500fb-1 11 02 03 04 05 06 07 08 09 10 RoundTable on future of B physics SuperBabar @SLAC (workshop starting 22nd October) S. Willocq SuperBelle @KEK (Workshop at end of September) N. Katayama + G. Gomez-Ceballos for CDF/D0 M. Merk LHCb @ CERN (1012 evts/year starting 2007) BTeV @ Fermilab (1011 evts/year starting 2009) H. Cheung

33. BaBar+ Belle (2007) CDF/D0 (2007) SuperBaBar (/year) SuperBelle (2010) LHCb (/year) BTeV (/year) Lumi Nbb 1ab-1 2x109 3fb-1 10ab-1 2x1010 3ab-1 6x109 1012 1011 da (pp) N(pp)eefftag 0.07 900 0.3 0.03 9000 3000 1000 1500 N(p0p0) dC(p0p0) 460 0.15 - 4600 0.05 1500 0.09 - - da (ppp) 0.06 0.03 0.06 dg( BsKK) - 10o - - 5o 5o dg (BdDK) 20O 500 evts 2o 6o 7-8o 13o dg (BsDsK) - 300evts - - 14o 8o dsin2b (fKS) 0.2 0.07 0.1 0.2 0.12 N(Xsll) 700 500 K*ll 7k 3K 4K K*ll 4K K*ll dsin2c (J/yh,J/Yf) - - - 0.06 0.02 Rough physics reaches Very approximate numbers that were used to stir the discussion

34. RoundTable on future of B physics • e+e- and hadron colliders are complementary: • Neutrals and long living particles can hardly be done at hadron colliders • Bs physics cannot be done at Y(4S) • It is important that CDF proves that precision B physics can be done at hadron colliders by doing CP in oscillation analyses • Need to prove e+e- experiments will work as well as now • The measurement of g with BsKK is not theoretically clean (U-spin is not conserved) • Will need BsKsKs? Who? • Requests from theory division: • Bsfp0 • Bsff • Knowledge of DMs and DGs crucial (Tevatron?)

35. The hope for WIN12 2012 CKM Fitter The End

36. Anything more new? Oscillations in BXsg

37. New physics and rare decays • 90% C.L. for BR(Bs+- ) < 1.6 x 10-6 (D0) • BR(Bs +- ) < 9.5x10-7 (CDF)