1. Impact of Recent Dms Results
Flavour in the era of the LHC 
May 15-17th 2006
Impact of Recent Dms Results
Stéphane T’Jampens
LAPP/IN2P3/CNRS
On behalf of the CKMfitter group

2. Dms: recent results 17 < Dms < 21 ps-1 @90 C.L.
hep-ex/
17 < Dms < 21 C.L.
(See G. Borissov’s talk)
FPCP ‘06
Dms = (stat) ± 0.07 (syst) ps-1
(See S. De Cecco’s talk)
The signal has a significance of 3.8s at 17.5 ps-1

3. Dms : constraint in the (r-h) plane_ _
Dms : constraint in the (r-h) plane
Very weak dependence on r and h _ _
The point is:
: SU(3)-breaking corrections
Measurement of Dms reduces the uncertainties on f2Bd Bd since x is better known from Lattice QCD
Leads to improvement of the constraint from Dmd measurement on |VtdV*tb|2

4. Dms : constraint in the (r-h) plane_ _
Dms : constraint in the (r-h) plane
from Dmd
from Dmd & Dms
Lower limit on Dms
Upper limit on Dms
x = 1.24 ± 0.04 ± 0.06 chiral logs
x = ( ) [lattice value not in the fit]
Not yet competitive with LQCD

5. Dms : constraint in the (r-h) plane_ _
Dms : constraint in the (r-h) plane
(Dms>14.4 ps-1)
(Summer ’05)
(Summer ’05)

6. Global CKM Fit Direct Measurement: Dms=17.34+0.49-0.20 ps-1
Global fit w/o Dms:
Dms= ps-1
In agreement with the global CKM fit.
Consistent with Standard Model

7. Constraint on g Global fit w/o Dms: g = 48.4+12.2-4.4 (deg)
 New bounds on Dms impose stringent constraints on g values

8. Constraint on |Vtd/Vts|
Dmd=0.508±0.004 ps-1

9. Constraint on New Physics
(See P. Ball’s talk)
0.2 fb-1
s(Dms)= 0.035, s(sin(2bs)= 0.1
Still plenty of room for NP
sin(2bs) = ± (global CKM fit)
Measurement at the LHC will be a very sensitive probe to NP