In the context of Calabi-Yau string models we explore the origin of characteristic pattern of quark-lepton masses and the CKM matrix. The discrete R-symmetry Z_K × Z_2 is introduced and the Z_2 is assigned to the R-parity. The gauge symmetry at the string scale, SU(6) × SU(2)_R, is broken into the standard model gauge group at a very large intermediate energy scale. At energies below the intermediate scale down-type quarks and also leptons are mixed with unobserved heavy states, respectively. On the other hand, there are no such mixings for up-type quarks. Due to the large mixings between light states and heavy ones we can derive phenomenologically viable fermion mass hierarchies and the CKM matrix. Mass spectra for intermediate-scale matter beyond the MSSM are also determined. Within this framework proton lifetime is long enough to be consistent with experimental data. As for the string scale unification of gauge couplings, however, consistent solutions are not yet found.
雑誌名
Progress of theoretical physics
巻
96
号
6
ページ
1249 - 1280
発行年
1996
出版者
理論物理学刊行会
ISSN
0033-068X
書誌情報
Progress of theoretical physics. 1996, 96(6), p. 1249-1280.
Fermion masses and mixings in a string inspired model.
matsudam018.pdf
(300.71KB)
AUE Repositoryへの登録について