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95% C.L. limits on B (B s  mm ). 100. CDF D0. Branching Fraction x 10 7. B  m + m - : - Limits scale almost linearly with luminosity - Current values entering the 10 -8 territory - First Tevatron result with 2 fb -1 - Any signal at Tevatron will be evidence of NP. 10. 1. 0.1.

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95% C.L. limits on B(Bsmm)

100

CDF

D0

Branching Fraction x 107

  • Bm+m-:

  • - Limits scale almost linearly with luminosity

  • - Current values entering the 10-8 territory

  • - First Tevatron result with 2 fb-1

  • - Any signal at Tevatron will be evidence of NP

10

1

0.1

10

100

1000

10000

pb-1

Summary

  • Tevatron is demonstrated to be a good place to study B rare decays offering:

  • - different possibilities to constraint more and more New Physics, Bmm, bsl+l-

  • - a physics program complementary to the B-Factories, Bs h+ h’-

  • Bh+h’-:

  • - First observation of Bs K-p+

  • - First observation of DCPV in Bs: ACP(BsK-p+)

  • appears to be large in agreement with expectation

  • bsl+l-:

  • - CDF/DØ beginning exploration of the bsl+l- field:

    • - New solid B  mmK signals from CDF;

    • smaller errors on BR and AFB will

    • constrain/rule-out different NP scenarios

    • - A 2.4 s excess in the Bsmmfreported from CDF,

      • upper limit close to SM prediction

  • Now, over 2 fb-1 on tape: significantly improved results coming soon

Rare B decays at the Tevatron - Moriond QCD 2007


7000 Signal events S/B  8.3 at the peak

Individual modes overlap in a single peak !

Bh+h’-: pp invariant mass

Region of unobserved

modes hidden in the cut

optimization procedure

Combinatorial

background

Partially

reconstructed

B-decays

Signal composition is determined with a Likelihood Fit, combining information from

kinematics (mass and momenta) and particle identification (dE/dx).

Rare B decays at the Tevatron - Moriond QCD 2007


BsK+p-

  • First measurement of Direct CP

  • asymmetry in the Bssystem

  • Very interesting to pursue

  • with more data!

  • Direct CP asymmetry measurements

  • for Lb modes in progress.

New results for the Bs K-p+ mode with 1 fb-1

In agreement with latest prediction of SCET: (4.9 +- 1.8) 10-6

Lower than previous predictions of QCDF and pQCD: [6-10] 10-6

Rare B decays at the Tevatron - Moriond QCD 2007


Bmm result summary

Dominant uncertainty sources

  • World best limit, compare

  • Babar (hep-ex/0408096, 110 fb-1 )

  • BR(Bdmm) < 8.3 ∙ 10-8 @ 90% C.L.

(*) D0 assumes the contribution of Bdmm to

B(Bsmm) suppressed due to |Vtd/Vts|2~ 0.04

Rare B decays at the Tevatron - Moriond QCD 2007


BR (Bmmh) result summary

  • Good agreement and similar uncertainty for B-Factories & Tevatron:

    • Babar PRD 73, 092001 (2006) (208 fb-1 ~10 mmK+, ~15mmK*0)

    • Belle hep-ex/0410006 (250 fb-1 ~40 mmK+, ~40mmK*0)

      Tevatron result summary

  • BR(B+mmK+) = [0.60 ± 0.15(stat.) ± 0.04(sys.)]x10-6 (45 ev. CDF)

  • BR(B0mmK*0) = [0.82 ± 0.31(stat.) ± 0.10(sys.)]x10-6 (20 ev. CDF)

  • BR(Bsmmf) < 2.4 x10-6 @ 90% C.L. (CDF, 920 pb-1)

  • = [1.16± 0.56(stat.) ± 0.42(sys.)]x10-6

  • BR(Bsmmf) < 3.3 x 10-6 @ 90% C.L. (D0, 450 pb-1)

Rare B decays at the Tevatron - Moriond QCD 2007


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