1. Paoti Chang National Taiwan University CKM2006, Nagoya, Dec. 16
Summary of Experimental Results for WG3
Paoti Chang
National Taiwan University
CKM2006, Nagoya, Dec. 16
16/12/06, Nagoya
P. Chang, CKM2006 1

2. P. Chang – Exp. Summary of WG3
Purpose and Outline
Aim: Vtd/Vts through mixing and rare B
and K decays.
What we presented: 6 talks in the WG3 session only, 29 talks in the joint session.
Results covered in this summary:
 b →sg, sll, B →r/w g
 D,B → tn
 Lifetime and Mixing
 fs and DGS / GS
CKM2006, 12/16
P. Chang – Exp. Summary of WG3 2

3. P. Chang – Exp. Summary of WG3
b →sg (Mikihiko Nakao)
Inclusive: on- a off with bkg suppression.
CKM2006, 12/16
P. Chang – Exp. Summary of WG3 3

4. P. Chang – Exp. Summary of WG3
b → sg, semi-inclusive
Reconstruct Xs from B →K np g, Khp(p)g
82 fb-1
CKM2006, 12/16
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5. P. Chang – Exp. Summary of WG3
b→sg, continue
Moment analysis: impact on mb and |Vub|  WG2
Er extrapolation based on OPE fit.
Are errors too small?
Consistent with NLO SM
e.g. (357±30) x 10-6
More NLO calculations
Slightly higher than
NNLO estimations
CKM2006, 12/16
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6. B→rg/wg, Gabriella Sciolla
Measure Vtd/Vts based on ratio of BFs.
New physics may contribute in the loop.
Light Cone Rum Rules
Theory error is around 7.4%. NP
s,d SM
Vtd,Vts
s,d
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7. P. Chang – Exp. Summary of WG3
B→rg/wg, Results
Belle, 370 fb-1
BaBar, 316 fb-1
B → r+ g
E(GeV)
Mbc(GeV/c2)
First observation of B→ r0g
CKM2006, 12/16
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8. P. Chang – Exp. Summary of WG3
B→rg/wg, Vtd/Vts
B
7.5%
9.4%
B
7.4%
8.2%
In excellent agreement with mixing
In 2008, Exp. error → 4.7%, theory error?
CKM2006, 12/16
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9. P. Chang – Exp. Summary of WG3
B→sll, Masako Iwasaki
Sensitive to new physics in the loop.
Semi-inclusive: same method as b→sg
Combined B fact. result
Belle
BaBar
Consistent with SM
CKM2006, 12/16
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10. P. Chang – Exp. Summary of WG3
B→sll, AFB(K*ll)
Belle
BaBar AFB and K* polar.
CKM2006, 12/16
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11. P. Chang – Exp. Summary of WG3
Search for B → K(*) nn
Search for B → K nn
Belle B → K* nn
+3.1
535 M BB; yield = 4.7
1.7s; BR(SM)= 1.3x10-5
-2.6
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12. P. Chang – Exp. Summary of WG3
Leptonic Decays: D(s)   +n _
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13. P. Chang – Exp. Summary of WG3
&
New CLEO-c result fDs=278 ± 17 ± 12 MeV (preliminary)
Weighted Average: fDs=280.1±11.6±6.0 MeV, the systematic error is mostly uncorrelated between the measurements (More data is on the way)
Previously CLEO-c measured
M. Artuso et al., Phys .Rev. Lett. 95 (2005)
Thus fDs/fD+=1.26±0.11±0.03
Sum of DS→m+n + t+n, t →p+n CLEO-c
100 evts
K0p+
Preliminary
CKM2006, 12/16
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14. P. Chang – Exp. Summary of WG3
Limits on Charged Higgs Mass
Another Gauge Boson could mediate decay
Ratio of leptonic decays could be modified with respect to expectations based on lepton masses and lepton universality
Can set limits in the tanb - mH± plane
Competitive with CDF
But depends on Lattice Model. Don’t take seriously yet
Summary of the 95% CL exclusions obtained by LEP & CDF. The full lines indicate the SM expectation (no H± signal) and the horizontal hatching represents the ±1s bands about the SM expectation.
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15. Comparisons with Theory
CLEO-c Data are consistent with most models, more precision needed
Using Lattice ratio find |Vcd/Vcs|=
0.22±0.03
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16. B → tn, L. Widhalm & A. Oyanguren 
Charged Higgs may contribute
t → e/m/h vv 
Test lepton university if mn is measured.
Require fully hadronic tag or
Dln tag and look for extra Eecl 
All hadr. or Dl (n)
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17. P. Chang – Exp. Summary of WG3
B → tn, Results
Belle Hadronic tag
D l n tag
e+nn (3.6%)
m+nn (2.4 %)
p+n (4.9%) p+p0n (2.0%)
pppn (0.8%)
First time with two ns in B decays
t+  e+nn (eff: 4.1%), m+nn (2.4%),
p+n (4.9%), p+p0n (1.2%)
First evidence, 3.5 s
No clear signal
Need more data
CKM2006, 12/16
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18. P. Chang – Exp. Summary of WG3
More on B→ l n (Belle)
With fb from HPQCD, |Vub| from HFAG
B → en, mu
CKM2006, 12/16
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19. Lifetime, J. Mumford & Bresse Quinn
 Hadronic decays
 Semi-letponic z
Obtain K from MC
Verified with B+/B0
CKM2006, 12/16
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20. P. Chang – Exp. Summary of WG3
BS lifetime
CDF, Bs → J/y f
D0, Bs → DS(fp) mn
N(J/y f) = 1133 ~
theory
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21. P. Chang – Exp. Summary of WG3
Bs → K+ K- lifetime
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22. P. Chang – Exp. Summary of WG3
Lb lifetime
CDF, Lb → J/y L
D0, Lb → J/y L
D0, Lb → LCmu
N ( J/y L) = 532
N = 4437
CDF t(J/y L) = 1.580±0.077(stat)±0.012(syst) ps
D0 t(J/y L) = 1.298±0.137(stat)±0.050(syst) ps
D0 t(LC mn) = (stat) ±0.09(syst) ps
theory
+0.12
-0.11
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23. Mixing, Franco Bedeschi
See Joe’s historical review.
Three key points:
Distinct vertex trigger.
Same side tagging
Better tracking/vertexing
A/A = 6.05
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24. P. Chang – Exp. Summary of WG3
Mixing, Gernot Weber
Provide first two-side bound in this spring
CKM2006, 12/16
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25. fs and DGS/GS, Gernot Weber
Light
Heavy
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26. P. Chang – Exp. Summary of WG3
Bs→J/y f Results
First attempt without fs = 0
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27. Future of fs & DGS, J. Hunen/N. Magini
Perform angular analysis
LHCb
Bs → J/y f
* CMS syst. evaluated with 1.3 fb-1 sample
The LHCb sensitivity for s is 0.02 rad (~1.2 degrees) for 2 fb-1
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28. P. Chang – Exp. Summary of WG3
Dms is measured; Vtd/Vts  theory error dominant.
Lb lifetime discrepancy? Need more data.
First attempt for fs; more studies on DGS/GS and fs.
Br(sg) is precisely measured; still has room for NP.
More observables: Acp, isospin symmy., TCPV ….
Will reduce Vtd/Vts (r/w g) error to 4.7%.
AFB(K*ll) is feasible but K(*)nn needs Super B.
New decay constant, fDs, is provided by CLEO.
B factory is searching for B decays with two
neutrinos. Start to probe standard model limit.
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