Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-10-23
Nucl.Phys. B493 (1997) 3-26
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 3 .eps figures included
Scientific paper
10.1016/S0550-3213(97)00134-X
A general operator expansion is presented for quark and lepton mass matrices in unified theories based on a U(2) flavor symmetry, with breaking parameter of order $V_{cb} \approx m_s/m_b \approx \sqrt{m_c/m_t}$. While solving the supersymmetric flavor-changing problem, a general form for the Yukawa couplings follows, leading to 9 relations among the fermion masses and mixings, 5 of which are precise. The combination of grand unified and U(2) symmetries provides a symmetry understanding for the anomalously small values of $m_u/m_c$ and $m_c/m_t$. A fit to the fermion mass data leads to a prediction for the angles of the CKM unitarity triangle, which will allow a significant test of these unified U(2) theories. A particular SO(10) model provides a simple realization of the general operator expansion. The lighter generation masses and the non-trivial structure of the CKM matrix are generated from the exchange of a single U(2) doublet of heavy vector generations. This model suggests that CP is spontaneously broken at the unification scale --- in which case there is a further reduction in the number of free parameters.
Barbieri Riccardo
Hall Jeffery L.
Raby Stuart
Romanino Andrea
No associations
LandOfFree
Unified Theories with U(2) Flavor Symmetry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Unified Theories with U(2) Flavor Symmetry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unified Theories with U(2) Flavor Symmetry will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-282180