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Probing beyond the Standard Model with B Decays

Probing beyond the Standard Model with B Decays. J. Chauveau LPNHE Univ. Paris 6-7 . On behalf of the BABAR Collaboration. ICHEP 2004, Aug . 16 th – 22 nd , 2004 Beijing, China. Outline. All results are preliminary unless otherwise noted. Interplay between theory and experiment

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Probing beyond the Standard Model with B Decays

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  1. Probing beyond the Standard Model with B Decays J. Chauveau LPNHE Univ. Paris 6-7 On behalf of the BABAR Collaboration ICHEP 2004, Aug. 16th – 22nd, 2004 Beijing, China J. Chauveau - Probing beyond ...

  2. Outline All results are preliminary unless otherwise noted • Interplay between theory and experiment • sin 2b with gluonic penguins • Polarization in B  Vector Vector decays • Puzzles in B  PP decays • Rare radiative and (semi) leptonic decays probing electroweak penguins • Summary and outlook J. Chauveau - Probing beyond ...

  3. Standard CKM fit Updated for ICHEP04 Thanks CKM fitter group! Overview • Where will New Physics peek through the Standard Model (CKM)? • Where SM itself depends on virtual particles: • B mixing, • Penguin Decays (Rare processes). • New physics brings new phases, heavy particleswe can see here. • Look for • Breakdown of Unitarity Triangle • Doesn’t close ? • different measurements of an angle disagree? • Rare processes which turn out not to be rare. J. Chauveau - Probing beyond ...

  4. ccbar KS, hfCP= -1 J/y KL, hfCP= +1 • sin2β = 0.722  0.040 (stat)  0.023 (sys) • |l| = 0.950  0.031 (stat) 0.013 (sys) prl sin 2b in b ccs tree decays See talk by M. Bruinsma in Session 8 PRELIMINARY J. Chauveau - Probing beyond ...

  5. I. sin 2b in gluonic penguin mediated decays(1) See talk by A. Hoecker (BABAR), and K.F. Chen (Belle) in session… d d J. Chauveau - Probing beyond ...

  6. +0.50 ±0.25 + 0.07-0.04 +0.55 ± 0.22 ± 0.12 ICHEP’04 +0.27 ± 0.14 ±0.03 PRELIMINARY sin 2b in gluonic penguin mediated decays (2) Belle in 2003: 3.5 s from SM! Phys.Rev.Lett. 91 (2003) 261602 -hf.Sf ΦK0 –0.96 ± 0.50 +0.09–0.11 0.47 ± 0.34 +0.08–0.06 K+K–KS 0.51 ± 0.26 ± 0.05 +0.18–0.00 0.56 ± 0.25 ± 0.04 +0.17–0.00 2003 η'KS 0.43 ± 0.27 ± 0.05 0.02 ± 0.34 ± 0.03 J. Chauveau - Probing beyond ...

  7. B  [K+K-]non-fKS SKKKs = - 0.42  0.17 452 ± 28 events sin 2b in gluonic penguin mediated decays(3) 227 106 B pairs hCP=+1 B0KS B f KS,L 114 ± 12, 96 ± 18 events S= + 0.50 ± 0.25 + 0.07-0.04 C= + 0.00 ± 0.23 ± 0.05 PRELIMINARY hCP=+1 B0KL J. Chauveau - Probing beyond ...

  8. The significant decrease in the statistical errors allow to perform interesting comparisons. Precise CP(t) measurement into watch. sin2b in gluonic penguin mediated decays(3) s-penguin average at 2.7 from sin2[cc] (BABAR only) PRELIMINARY Also New: 100% 95% 90% pure-P J. Chauveau - Probing beyond ...

  9. II. Polarization in charmless B VV decays(1) See talk by A. Gritsan (BABAR) and J. Zhang (Belle) in session 11. • Many spin-related observables of interest (11 from 3 amplitudes of B and Bbar): • Polarization fractions, • Direct CP asymmetries • Triple product asymmetries • In the SM, expect longitudinal polarization. Each spin flip (wrt e.g./ sL sRsL) costs 1/mb in amplitude. • B  fK* puzzle (since 2002) • Tree give fL~1, (=0.99 ± 0.05 r+r-). • In fK* (Penguin), fL ~0.5 J. Chauveau - Probing beyond ...

  10. Polarization confirmed No sign of CP violation PRL FSI B0 f K* PRELIMINARY J. Chauveau - Probing beyond ...

  11. B+ w r+ B0f K*0(1430) B- K*0 r- Polarization in charmless B VV decays(3) T PRELIMINARY P J. Chauveau - Probing beyond ...

  12. confirmed less striking Belle hep-ex/3007014 10.0 ± 1.6 ± 0.8 6.7 ± 2.0 ± 0.9 0.43 ± 0.09 ± 0.04 86 Belle From A. Gritsan session 11 Polarization in charmless B VV decays(4) J. Chauveau - Probing beyond ...

  13. Polarization in charmless B VV decays(5) • In summary • f K* The polarization puzzle fL ~0.5, remains with better statistics. • Many observables available to attack the problem: ACP, AT. • More penguin modes become measurable like r K*. • The effect is less clear but the errors are still big. • Tree dominated modes are fully polarized. • An explanation is needed. • New physics scenarios exist. • Standard effects (strong interaction) to be understood. • Many more measurements are in progress. J. Chauveau - Probing beyond ...

  14. b u u s q q 5.8 ± 0.6 ± 0.4 1.2 ± 0.3 ± 0.1 q q 12.0 ± 0.7 ± 0.6 25.9 ± 1.3 ± 1.1 11.4 ± 0.9 ± 0.6 Z,g PRELIMINARY Thanks CKM fitter group! III. The “K(p)p puzzle” J. Chauveau - Probing beyond ...

  15. The experiments measure easily many hadronic branching ratios. • The 2-body BF and Acp reach interesting precisions. (Lumi, PID) • Phenomenologists try to understand the whole busy picture. • Not so simple since ‘low energy’ QCD is at play in hadron dynamics • Isospin : reliable guideline (see how pp and rr can lead to gCKM) • Models are built to match “unexpected features” high p0p0, low p+p- • “Unexpected features “ also show up in Kp channels (less than 2 sigma effect). • A scenario dealing with this “K p puzzle’invokes electroweak-like penguin • isospin breaking amplitudes to tame the discrepancies. • The scenario is predictive, so it’s fun: Yoshikawa hep-ph0206147, Gronau-Rosner hep-ph/0307095, Benecke-Neubert 0308039, Buras, Fleischer, Recksiegel, Scwab hep-ph/0312259 &0402112 K(p)p • Cp0p0= -0.40 ± 0.350.18, Sp0p0= -0.56 ±0.44 • Cp0KS= +0.05 ± 0.240.29, Sp0KS= -0.99 ±0.040.01 • Striking effect in rare K decays K  pnn • AFBCP=(0.03 ± 0.01) tan qY where qY~-1000 in K*mm, BIG. • Enhancement of BF(b s,d nn) and BF(b mm) by factors 2 and 5. • Could push up sin2b in f KS. • A connection between hadronic and electroweak decays Keep in mind, it’s a 2sigma effect in strong interactions. J. Chauveau - Probing beyond ...

  16. p0 p0 C= -0.12 ± 0.56 ±0.06 C= -0.09 ± 0.15 ± 0.04 S= -0.30 ± 0.17 ± 0.02 C=0.06± 0.18 ± 0.06 S= 0.35 ±0.300.33 ±0.04 0.01 ± 0.10 ± 0.02 -0.133 ±0.030 ± 0.009 0.06 ± 0.06 ± 0.02 Direct CP violation! The “K(p)p puzzle” PRELIMINARY J. Chauveau - Probing beyond ...

  17. Electroweak FCNC in the SM • The EWSB scale is probed in the loop diagrams. • A window on the high energy collider physics. • CP violation phenomenology could be rich. • Inclusive channels difficult to measure, well predicted by theory, The opposite for the exclusive channels • Highlights: b r g shown in Moriond. Time dependant CP violation in K*0(Ks p0) g IV. Rare decays (radiative penguins) See talks by J. Berryhill/H. Yang and H. Staengle/A. Ishikawa in session 8 J. Chauveau - Probing beyond ...

  18. Radiative penguin decays (2) B r(w)g M. Iwasaki at Moriond 2004 BF/(10-6 ) = (1.8 ± 0.6 ± 0.1) Bd K* g CP(t) PRELIMINARY PRELIMINARY S = + 0.25 ± 0.63 ± 0.14 C = - 0.57 ± 0.32 ± 0.09 A première PRL BF < 1.2 x10-6 90% CL Theory: 0.9 - 1.6 PRL J. Chauveau - Probing beyond ...

  19. Rare decays (radiative penguins) (3) • b  s(d) g • No surprise b  s g / (10-4)= 3.54 ± 0.30 (Exp.) vs 3.57 ± 0.30 (theo. NLO) ! • CP asymmetries not limited by systematics nor by theory. • Time dependant ACP measured for the 1st time in radiative decays. • b d gthere? b  s l+l- • Lose one factor aem but access to virtuality. Measure Mll spectrum and AFB. • A lot of new measurements to come. b  s nnbar • Expect BF/(10-6 )= in SM, measure 90% c.l. UL PRELIMINARY 4 0.3 52 K nnbar 100 pnnbar J. Chauveau - Probing beyond ...

  20. Rare leptonic decays(1) See talk by G.P. Dubois-Felsman in session… Clean in experiment and theory Some extensions to the SM increase BF(B0 l+l-) by 105 J. Chauveau - Probing beyond ...

  21. Rare leptonic decays(2) (10-6) PRL PRL CLEO hep-ex/0408011 et < 11. 10-5 mt < 3.8 10-5 PRELIMINARY • No surprise yet • Some limits are close to the SM. • More data already on tape. J. Chauveau - Probing beyond ...

  22. Summary and outlook • B factory in full production. • Many channels challenge the UT. • No significant breaking of the SM. • Penguins (gluonic or electroweak or unknown) offer ways to look for new physics in rare decays. • The search reach an interesting level of precision. • Intriguing BABAR-Belle differences. • Therefore there are many effects (puzzles) to explore: • sin2b in b s gluon. • Polarization in B  Vector Vector. • Pattern of the Kp (and pp) Branching Fractions. • Some rare decay searches reach the level of the SM. A lot of action at the B factories for several years to come. J. Chauveau - Probing beyond ...

  23. Backup slides J. Chauveau - Probing beyond ...

  24. Luminosity J. Chauveau - Probing beyond ...

  25. sin 2b: BABAR/Belle Winter 2004 J. Chauveau - Probing beyond ...

  26. s-penguin average at 2.7 from sin2[cc] (BABAR only) no indication for direct CP violation sin2b in gluonic penguin mediated decays(3) J. Chauveau - Probing beyond ...

  27. Polarization in charmless B VV decays(backup) From A. Gritsan session 11 J. Chauveau - Probing beyond ...

  28. Rare decays (radiative penguins) (backup) J. Chauveau - Probing beyond ...

  29. Radiative penguin decays (backup) exclusive inclusive J. Chauveau - Probing beyond ...

  30. PRELIMINARY Rare leptonic decays(backup) tn nn(g) In MSSM with MFV (Minimal Flavor Violation): MH+ >138 GeV/c2 For tanbSUSY=60 PRELIMINARY J. Chauveau - Probing beyond ...

  31. New sans beta sans alpha J. Chauveau - Probing beyond ...

  32. Old J. Chauveau - Probing beyond ...

  33. New Avec beta et alpha J. Chauveau - Probing beyond ...

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