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Title: New class of SO(10) models for flavor

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 1; Related Information: CHORUS Timestamp: 2016-07-25 18:10:58; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Babu, K. S., Bajc, Borut, and Saad, Shaikh. New class of SO(10) models for flavor. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.94.015030.
Babu, K. S., Bajc, Borut, & Saad, Shaikh. New class of SO(10) models for flavor. United States. doi:10.1103/PhysRevD.94.015030.
Babu, K. S., Bajc, Borut, and Saad, Shaikh. 2016. "New class of SO(10) models for flavor". United States. doi:10.1103/PhysRevD.94.015030.
title = {New class of SO(10) models for flavor},
author = {Babu, K. S. and Bajc, Borut and Saad, Shaikh},
abstractNote = {},
doi = {10.1103/PhysRevD.94.015030},
journal = {Physical Review D},
number = 1,
volume = 94,
place = {United States},
year = 2016,
month = 7

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.94.015030

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  • We discuss a new general class of mass matrix {ital Ansatz} that respects the fermion mass hierarchy and {ital calculability} of the flavor mixing matrix. This is a generalization and justification of the various specific forms of the mass matrix by successive breaking of the maximal permutation symmetry. By confronting the experimental data, a large class of the mass matrices are shown to survive, while certain specific cases are phenomenologically ruled out. Also the CP violation turns out to be maximal, when the phase of the (1,2) element of the mass matrix is {pi}/2. {copyright} {ital 1997} {ital The Americanmore » Physical Society}« less
  • It is shown that the masses of neutral Higgs particles in the minimal SU(2)/sub L/ x SU(2)/sub R/ x U(1) left-right-symmetric gauge theory which mediate flavor-changing interactions can be as large as necessary without running into conflict with experiment or with the validity of perturbation theory.
  • We discuss the problem of scalar currents which are nondiagonal in flavor in grand unified models. We show that only soft mixing of the weak doublets of Higgs scalars, which arises in these models after the spontaneous breaking of G into SU(3)xSU(2)xU(1) is on the one hand capable of giving large masses (mapprox.(..cap alpha..--1)M, M is the grand unification mass) to all electrically neutral Higgs bosons, blocking Yukawa couplings with flavor change, and can on the other hand induce vacuum expectation values (approx.O(G/sup -1//sub F/)) which can give a reasonable description of the quark-lepton mass spectrum. As an illustration wemore » consider a simple SU(5) model with two quintets of Higgs scalars in a form which can be generalized to an arbitrary number of multiplets of any kind.« less
  • We study a new class of flavor-changing interactions, which can arise in models based on extended gauge groups (rank [gt]4) when new charged fermions are present together with a new neutral gauge boson. We discuss the cases in which the flavor-changing couplings in the new neutral current coupled to the [ital Z][prime] are theoretically expected to be large, implying that the observed suppression of neutral flavor-changing transitions must be provided by heavy [ital Z][prime] masses together with small [ital Z]-[ital Z][prime] mixing angles. Concentrating on E[sub 6] models, we show how the tight experimental limit on [mu][r arrow][ital eee] impliesmore » serious constraints on the [ital Z][prime] mass and mixing angle. We conclude that if the value of the flavor-changing parameters is assumed to lie in a theoretically natural range, in most cases the presence of a [ital Z][prime] much lighter than 1 TeV is unlikely.« less