# Presentation: 772194

## Summary

**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************, b********sl****+****l****-**
**  ****- a physics program complementary to the B-Factories, B****s******** h****+**** h’****-**** **

** ****B********h****+****h’****-****:**
-   - First observation of Bs K-+
-   - First observation of DCPV in Bs: ACP(BsK-+)
-   appears to be large in agreement with expectation

** ****b********sl****+****l****-****:**
-   - CDF/DØ beginning exploration of the bsl+l- field:
-   - New solid B  K signals from CDF;
-     smaller errors on BR and AFB will
-     constrain/rule-out different NP scenarios
-   - A 2.4  excess in the Bsreported 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

- F. Scuri

## Bh+h’-:  invariant mass

- Signal composition is determined with a Likelihood Fit, combining information from
- kinematics (mass and momenta) and particle identification (dE/dx).

- Region of unobserved
- modes hidden in the cut
- optimization procedure

- Combinatorial
- background

- Partially
- reconstructed
-  B-decays

**B********h****+****h’****-****: ******** invariant mass**

- Rare B decays at the Tevatron - Moriond QCD 2007

- F. Scuri

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

**New results for the B****s**** ******** K****-********+ ****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

- F. Scuri

## B result summary

|  |  B(Bs)
 90% (95%) C.L. |  B(Bd)
90% (95%) C.L. | Int.Lum.
    pb-1 |
| --- | --- | --- | --- |
| CDF | < 8.0∙10-8(10) | < 2.3∙10-8(3) |   780 |
| D0(combined) | < 7.5∙10-8(9.3) | (*) |  2000 |

- World best limit, compare
- Babar (hep-ex/0408096, 110 fb-1 )
- BR(Bd) < 8.3 ∙ 10-8 @ 90%  C.L.

**(*) D0 assumes the contribution of B****d************ to **
**B****(B****s************) ****suppressed due to |V****td****/V****ts****|****2**** ~ 0.04**

|  | Rel.Unc.
    [%] |
| --- | --- |
| Background |   ~ 30 |
| fu/fs |   ~ 13 |

**Dominant uncertainty sources**

**B************ result summary**

| Experiment |  | B0s search |  | B0d search |  |
| --- | --- | --- | --- | --- | --- |
|  |  | Expected | Obs. | Expected | Obs. |
| CDF | 780 pb-1 | 1.27±0.37 | 1 | 2.45±0.40 | 2 |
| D0 | Run IIa
(~1250 pb-1) | 0.8±0.2 | 1 |      |  |
|  | Run IIb
(~750 pb-1) | 1.5±0.5 | 2 |  |  |

- Rare B decays at the Tevatron - Moriond QCD 2007

- F. Scuri

## BR (Bh) result summary 

**BR (B************h) result summary**

- Good agreement and similar uncertainty for B-Factories & Tevatron:
- Babar PRD 73, 092001 (2006) (208 fb-1   ~10 ****K+, ~15****K*0)
- Belle hep-ex/0410006               (250 fb-1   ~40 ****K+, ~40****K*0)
- Tevatron result summary
- BR(B+****K+)  = [0.60 ± 0.15(stat.) ± 0.04(sys.)]x10-6   (45 ev. CDF)
- BR(B0****K*0) = [0.82 ± 0.31(stat.) ± 0.10(sys.)]x10-6   (20 ev. CDF)
- BR(Bs********)   < 2.4 x10-6 @ 90% C.L.			(CDF, 920 pb-1)
-                         = [1.16 ± 0.56(stat.) ± 0.42(sys.)]x10-6
- BR(Bs********) < 3.3 x 10-6 @ 90% C.L.  			(D0,    450 pb-1)

- Rare B decays at the Tevatron - Moriond QCD 2007

- F. Scuri