323
20.7. Quark weak currents
FIGURE 20.11
Constraints in the ¯
ρ, η ¯ plane. The shaded areas have 95% CL. [Figure reproduced, courtesy Michael Barnett for the Particle Data Group, from the review
of the CKM Quark-Mixing Matrix by A Ceccucci, Z Ligeti and Y Sakai, section 11 in the Review of Particle Physics, K Nakamura et al. (Partcle Data
Group) Journal of Physics G 37 (2010) 075021, IOP Publishing Limited.]
(See color plate III.)
∗
∗
¯
|z 1 | = |V td V tb /V cd V cb |, where |V td | is deduced from the value of the B
0
− B
0
¯
mass difference Δm d measured in B
0
− B
0 oscillations mediated by top-quark
dominated box diagrams (see section 21.2.1 in the following chapter); here
the uncertainties are dominated by lattice QCD. Figure 20.11 represents an
enormous experimental effort, especially in the decade 2000-2010. The 95%
CL regions all overlap consistently. It is quite remarkable how the single
CP- violating parameter, three-generation scheme of Kobayashi and Maskawa
(1973) has withstood this searching test.
20.7. Quark weak currents
FIGURE 20.11
Constraints in the ¯
ρ, η ¯ plane. The shaded areas have 95% CL. [Figure reproduced, courtesy Michael Barnett for the Particle Data Group, from the review
of the CKM Quark-Mixing Matrix by A Ceccucci, Z Ligeti and Y Sakai, section 11 in the Review of Particle Physics, K Nakamura et al. (Partcle Data
Group) Journal of Physics G 37 (2010) 075021, IOP Publishing Limited.]
(See color plate III.)
∗
∗
¯
|z 1 | = |V td V tb /V cd V cb |, where |V td | is deduced from the value of the B
0
− B
0
¯
mass difference Δm d measured in B
0
− B
0 oscillations mediated by top-quark
dominated box diagrams (see section 21.2.1 in the following chapter); here
the uncertainties are dominated by lattice QCD. Figure 20.11 represents an
enormous experimental effort, especially in the decade 2000-2010. The 95%
CL regions all overlap consistently. It is quite remarkable how the single
CP- violating parameter, three-generation scheme of Kobayashi and Maskawa
(1973) has withstood this searching test.