Transcript Impact of Dms measurement

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
Dms: recent results
hep-ex/0603029
17 < Dms < 21 ps-1 @90 C.L.
(See G. Borissov’s talk)
FPCP ‘06
Dms = 17.33+0.42-0.21(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
__
Dms : constraint in the (r-h) plane
Very
_ weak_ dependence
on r and h
The point is:
x: 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
__
Dms : constraint in the (r-h) plane
from Dmd
Lower limit on Dms
from Dmd & Dms
Upper limit on Dms
x = 1.24 ± 0.04 ± 0.06 chiral logs
x = (1.06+0.122-0.047) [lattice value not in the fit]
Not yet competitive with LQCD
__
Dms : constraint in the (r-h) plane
0.024
(Dms>14.4 ps-1)
h

0
.
327
r  0.21900..076

0
.
046
040
(Summer ’05)
(Summer ’05)
Global CKM Fit
Direct Measurement:
Dms=17.34+0.49-0.20 ps-1
Global fit w/o Dms:
Dms=21.7+5.9-4.2 ps-1
In agreement with the
global CKM fit.
Consistent with Standard
Model
Constraint on g
Global fit w/o Dms:
g = 48.4+12.2-4.4 (deg)
Global fit :
g = 59.8+4.9-4.1(deg)
 New bounds on Dms
impose stringent
constraints on g values
Constraint on |Vtd/Vts|
2
Dmd mBd 2 Vtd

x Dm
2
Dms mBs
Vts
Dmd=0.508±0.004 ps-1
Constraint on New Physics
(See P. Ball’s talk)
0.2 fb-1
Still plenty of room for NP
s(Dms)= 0.035, s(sin(2bs)= 0.1
 sin(2bs) =0.0365 ± 0.002 (global CKM fit)
 Measurement at the LHC will be a very sensitive probe to NP