CKM matrix and FCNC suppression in SO(5)×U(1)×SU

Shuichiro Funatsu

¹

,

Hisaki Hatanaka²,

Yutaka Hosotani

³

et al.

Abstract

The Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix and flavor-changing neutral currents (FCNC's) in the quark sector are examined in the GUT inspired SO(5) × U (1) × SU (3) gauge-Higgs unification in which the 4D Higgs boson is identified with the Aharonov-Bohm phase in the fifth dimension. Gauge invariant brane interactions play an important role for the flavor mixing in the charged-current weak interactions. The CKM matrix is reproduced except that the up quark mass needs to be larger than the observed one. FCNC's are naturally suppressed as a consequence of the gauge invariance, with a factor of order 10 −6 . It is also shown that induced flavor-changing Yukawa couplings are extremely small.

Fermion pair production at e−e+ linear collider experiments in GUT inspired gauge-Higgs unification

“…The parameters of the model are determined in the steps described in Refs. [13][14][15] [11,12] that sin θ 0 W ¼ 0.2305 yields W and Z coupling constants of quarks and leptons which are nearly the same as those in the SM with sin 2 θ W ¼ 0.2312. In our analysis, we will use the values of sin θ 0 W for each set of θ H and m KK that reproduce the central value of A FB ðe − e þ → μ − μ þ Þ.…”

“…The SUð3Þ C × SOð5Þ × Uð1Þ X gauge theory in the Randall-Sundrum (RS) warped space has been proposed in Refs. [7][8][9][10][11][12][13][14][15]. It gives nearly the same phenomenology at low energies as the SM [10][11][12]16].…”

“…[13] and further investigated in Refs. [14,15]. It is defined in the RS warped space with the metric given by…”

Branching fractions and polarizations of D→Vℓνℓ within QCD light-cone sum rule

“…In this part, we probe the decay width of D → V semilepton decay by applying Eqs. (4), (6), and (7). First, we present the LCSR predictions for the polarization differential decay widths 1/|V cq | 2 × d L /dq 2 and 1/|V cq | 2 × d T /dq 2 and the total differential decay widths 1/|V cq | 2 × d /dq 2 in Fig.…”

“…Semileptonic decays of charm mesons to vector mesons are a significant component in deeper understanding of the standard model (SM) in the post-Higgs era. Those decays not only are directly related to Cabibbo Kobayashi Maskawa (CKM) matrix elements providing a window to study the CP-violation problem [1][2][3][4][5][6][7][8] but also contain the flavor-changing neutral current (FCNC) processes, which are sensitive to new physics (NP) because it occurs in at least one loop level in the SM [9][10][11][12][13]. For the D-meson semileptonic decay processes, the BESIII [14][15][16] and CLEO [17][18][19][20][21][22] Collaborations have reported the branching fraction and form factors at a large recoil point.…”