Flavor Structure of the Three Site Higgsless Model
by
DrMasafumi Kurachi(Nagoya Univ.)
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Europe/Rome
Aula Seminari (LNF)
Aula Seminari
LNF
Via Enrico Fermi, 40
00044 Frascati (Roma)
Description
We study the flavor structure in the three site Higgsless model. In this model, the gauge bosons and fermions have heavy partners, coming from the Kaluza-Klein excitation in the dimensional deconstruction picture. The yukawa couplings are introduced in a way
to minimize the flavor chaning neutral current in the light sector at the
tree level. Due to the flavor mixing between the light and the heavy
partner fields, new effects on FCNC's appear at one-loop level. As an
example of such FCNC processes, we calculate the contribution to the b
-> s gamma amplitude in the three site Higgsless model. Interestingly,
heavy particles which exist in the three site Higgsless model do not
completely decouple in the heavy-mass limit. One-loop level b -> s
gamma amplitude is calculated by considering all possible combinations of particles in the loop, then it is compared to the experiment. The result shows that the central value of the B -> X_s gamma branching ratio in the three site Higgsless model takes closer value to its experimental
central value as one takes the larger value of a free parameter,\varepsilon_{tR}, within a range allowed by the precision electroweak measurement.