QUARK MIXINGS AS A TEST OF A NEW SYMMETRY OF QUARK YUKAWA COUPLINGS

Citation
H. Gonzalez et al., QUARK MIXINGS AS A TEST OF A NEW SYMMETRY OF QUARK YUKAWA COUPLINGS, Physics letters. Section B, 440(1-2), 1998, pp. 94-100
Citations number
17
Categorie Soggetti
Physics
Journal title
ISSN journal
03702693
Volume
440
Issue
1-2
Year of publication
1998
Pages
94 - 100
Database
ISI
SICI code
0370-2693(1998)440:1-2<94:QMAATO>2.0.ZU;2-O
Abstract
We assume that Yukawa couplings of up and down quarks are related by Y -u proportional to Y-d(2) at grand unification (GU) scale. Using the s pecific ansatz for Y-d We Obtain the CKM matrix that is symmetrical at the GU scale and two relations between the quark masses. Using three specific models as illustrative examples for the evolution down to low energies, we obtain a non-symmetric CKM matrix whose entries are in g ood agreement with their measured values and two quark mass relations at the m(t) scale: (m(u)/m(c)) = (m(d)/m(s))(2) and (m(c)/m(t)) = k(m( s)/m(b))(2) with the coefficient k fixed from the renormalization grou p (RG) evolution. (C) 1998 Elsevier Science B.V. All rights reserved.