Grand Unified Theory

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Yasuhiro Shimizu - One of the best experts on this subject based on the ideXlab platform.

  • fermion mass hierarchy in six dimensional so 10 Grand Unified Theory on a t2 z2 orbifold
    Physics Letters B, 2002
    Co-Authors: Naoyuki Haba, T Kondo, Yasuhiro Shimizu
    Abstract:

    Abstract We suggest a simple supersymmetric SO (10) Grand Unified Theory in 6 dimensions which produces the suitable fermion mass hierarchies. The 5th- and 6th-dimensional coordinates are compactified on a T 2 / Z 2 orbifold. The gauge and Higgs fields propagate in 6 dimensions while ordinal chiral matter fields are localized in 4 dimensions. The orbifolding and boundary conditions realize the gauge symmetry reduction, SU (3) C × SU (2) L × U (1) Y × U (1) X , and the triplet–doublet mass splitting. We introduce extra three sets of vector-like heavy fields: two sets propagate in 6 dimensions and chiral fields which couple to them are defined as the 1st generation, and one set propagates in 5 dimensions and chiral fields which couple to them are defined as the 2nd generation. The suitable fermion mass hierarchies are generated by integrating out these vector-like heavy fields.

  • Fermion Mass Hierarchy in the Grand Unified Theory on an S1/(Z2 ×Z2′) Orbifold
    Progress of Theoretical Physics, 2002
    Co-Authors: Naoyuki Haba, Yasuhiro Shimizu, Tomoharu Suzuki, Kazumasa Ukai
    Abstract:

    We suggest a simple Grand Unified Theory where the fifth dimensional coordinate is compactified on an $S_1/(Z_2 \times Z_2')$ orbifold. This model is based on the supersymmetric flipped $SU(5) \times U(1)$ Grand Unified Theory, which can realize not only the triplet-doublet splitting but also the natural fermion mass hierarchies. The triplet-doublet splitting is realized by $S_1/(Z_2 \times Z_2')$ orbifolding, which also reduces the gauge group as $SU(5) \times U(1) \to SU(3)_c \times SU(2)_L \times U(1)_Z \times U(1)_X$. The suitable fermion mass hierarchies are generated by integrating out extra three sets of vector-like heavy fields which can propagate in five dimensions. The radiative corrections to the large Yukawa coupling of right-handed neutrinos can reduce the gauge group to $SU(3)_c \times SU(2)_L \times U(1)_Y$.

  • fermion mass hierarchy in six dimensional so 10 Grand Unified Theory on a t 2 z_2 orbifold
    arXiv: High Energy Physics - Phenomenology, 2001
    Co-Authors: Naoyuki Haba, T Kondo, Yasuhiro Shimizu
    Abstract:

    We suggest a simple supersymmetric SO(10) Grand Unified Theory in 6 dimensions which produces the suitable fermion mass hierarchies. The 5th and 6th dimensional coordinates are compactified on a $T^2/Z_2$ orbifold. The gauge and Higgs fields propagate in 6 dimensions while ordinal chiral matter fields are localized in 4 dimensions. The orbifolding and boundary conditions realize the gauge symmetry reduction, $SU(3)_C\times SU(2)_L \times U(1)_Y \times U(1)_X$, and the triplet-doublet mass splitting. We introduce extra three sets of vector-like heavy fields: two sets propagate in 6 dimensions and chiral fields which couple to them are defined as the 1st generation, and one set propagates in 5 dimensions and chiral fields which couple to them are defined as the 2nd generation. The suitable fermion mass hierarchies are generated by integrating out these vector-like heavy fields.

  • fermion mass hierarchy in the Grand Unified Theory on s_1 z_2 times z_2 orbifold
    arXiv: High Energy Physics - Phenomenology, 2001
    Co-Authors: Naoyuki Haba, Yasuhiro Shimizu, Tomoharu Suzuki, Kazumasa Ukai
    Abstract:

    We suggest a simple Grand Unified Theory where the fifth dimensional coordinate is compactified on an $S_1/(Z_2 \times Z_2')$ orbifold. This model is based on the supersymmetric flipped $SU(5) \times U(1)$ Grand Unified Theory, which can realize not only the triplet-doublet splitting but also the natural fermion mass hierarchies. The triplet-doublet splitting is realized by $S_1/(Z_2 \times Z_2')$ orbifolding, which also reduces the gauge group as $SU(5) \times U(1) \to SU(3)_c \times SU(2)_L \times U(1)_Z \times U(1)_X$. The suitable fermion mass hierarchies are generated by integrating out extra three sets of vector-like heavy fields which can propagate in five dimensions. The radiative corrections to the large Yukawa coupling of right-handed neutrinos can reduce the gauge group to $SU(3)_c \times SU(2)_L \times U(1)_Y$.

  • CP violation in the μ→3e process and supersymmetric Grand Unified Theory
    Physical Review D, 1998
    Co-Authors: Yasuhiro Okada, Kenichi Okumura, Yasuhiro Shimizu
    Abstract:

    A triple vector correlation in the $\mu^{+} \to e^{+} e^{+} e^{-}$ decay with polarized muons is investigated as a probe to CP violating coupling constants in supersymmetric models. A sizable triple correlation can be induced due to a complex phase in the supersymmetric soft-breaking terms in the SU(5) Grand Unified Theory. Correlation with the electric dipole moments of electron and neutron are investigated and it is shown that these quantities give independent information on possible CP violating sources.Comment: 11 pages, 6 figures. Fig.2(a), fig.2(b) and fig.3 are changed due to an error of our numerical calculation but main conclusion unchanged. Also added some discussions and figures of the neutron EDM. Version to appear in Physical Review D, Rapid Communication

L T Handoko - One of the best experts on this subject based on the ideXlab platform.

  • Grand Unified Theory based on the su 6 symmetry
    Physical Review D, 2005
    Co-Authors: A Hartanto, L T Handoko
    Abstract:

    We present a complete set of generators for the rank 5 special unitary group, SU(6), to unify strong, weak and electromagnetic interactions. The unification is realized through the breaking pattern of SU(6){yields}SU(3){sub C}xSU(3){sub H}xU(1){sub C} followed by SU(3){sub H}{yields}SU(2){sub L}xU(1){sub B}. All known elementary particles and its quantum numbers are well accommodated in its {l_brace}6{r_brace} and {l_brace}15{r_brace} multiplets. These multiplets require a new neutral fermion which should be assigned as the heavy Majorana neutrino to realize the seesaw mechanism naturally.

Naoyuki Haba - One of the best experts on this subject based on the ideXlab platform.

  • igut Grand Unified Theory on interval
    Journal of High Energy Physics, 2008
    Co-Authors: Naoyuki Haba, Yutaka Sakamura, Toshifumi Yamashita
    Abstract:

    We investigate a construction of five-dimensional (5D) Grand Unified theories (GUTs) on an interval, which we call iGUTs. We analyze supersymmetric SO(10) iGUT as an example, where the gauge multiplet is spread over the 5D bulk. The SO(10) is directly reduced to the standard model gauge symmetry through the interval boundary conditions. Notice that this rank reduction is impossible in case of GUTs on orbifolds. Four scenarios are possible according to locations (bulk or brane) of Higgs and matter fields. We investigate the gauge-coupling unification, the proton decay, the SO(10) GUT features such as t-b-τ unification and so on in each scenario. We also comment on the flavor phenomenology.

  • fermion mass hierarchy in six dimensional so 10 Grand Unified Theory on a t2 z2 orbifold
    Physics Letters B, 2002
    Co-Authors: Naoyuki Haba, T Kondo, Yasuhiro Shimizu
    Abstract:

    Abstract We suggest a simple supersymmetric SO (10) Grand Unified Theory in 6 dimensions which produces the suitable fermion mass hierarchies. The 5th- and 6th-dimensional coordinates are compactified on a T 2 / Z 2 orbifold. The gauge and Higgs fields propagate in 6 dimensions while ordinal chiral matter fields are localized in 4 dimensions. The orbifolding and boundary conditions realize the gauge symmetry reduction, SU (3) C × SU (2) L × U (1) Y × U (1) X , and the triplet–doublet mass splitting. We introduce extra three sets of vector-like heavy fields: two sets propagate in 6 dimensions and chiral fields which couple to them are defined as the 1st generation, and one set propagates in 5 dimensions and chiral fields which couple to them are defined as the 2nd generation. The suitable fermion mass hierarchies are generated by integrating out these vector-like heavy fields.

  • Fermion Mass Hierarchy in the Grand Unified Theory on an S1/(Z2 ×Z2′) Orbifold
    Progress of Theoretical Physics, 2002
    Co-Authors: Naoyuki Haba, Yasuhiro Shimizu, Tomoharu Suzuki, Kazumasa Ukai
    Abstract:

    We suggest a simple Grand Unified Theory where the fifth dimensional coordinate is compactified on an $S_1/(Z_2 \times Z_2')$ orbifold. This model is based on the supersymmetric flipped $SU(5) \times U(1)$ Grand Unified Theory, which can realize not only the triplet-doublet splitting but also the natural fermion mass hierarchies. The triplet-doublet splitting is realized by $S_1/(Z_2 \times Z_2')$ orbifolding, which also reduces the gauge group as $SU(5) \times U(1) \to SU(3)_c \times SU(2)_L \times U(1)_Z \times U(1)_X$. The suitable fermion mass hierarchies are generated by integrating out extra three sets of vector-like heavy fields which can propagate in five dimensions. The radiative corrections to the large Yukawa coupling of right-handed neutrinos can reduce the gauge group to $SU(3)_c \times SU(2)_L \times U(1)_Y$.

  • fermion mass hierarchy in six dimensional so 10 Grand Unified Theory on a t 2 z_2 orbifold
    arXiv: High Energy Physics - Phenomenology, 2001
    Co-Authors: Naoyuki Haba, T Kondo, Yasuhiro Shimizu
    Abstract:

    We suggest a simple supersymmetric SO(10) Grand Unified Theory in 6 dimensions which produces the suitable fermion mass hierarchies. The 5th and 6th dimensional coordinates are compactified on a $T^2/Z_2$ orbifold. The gauge and Higgs fields propagate in 6 dimensions while ordinal chiral matter fields are localized in 4 dimensions. The orbifolding and boundary conditions realize the gauge symmetry reduction, $SU(3)_C\times SU(2)_L \times U(1)_Y \times U(1)_X$, and the triplet-doublet mass splitting. We introduce extra three sets of vector-like heavy fields: two sets propagate in 6 dimensions and chiral fields which couple to them are defined as the 1st generation, and one set propagates in 5 dimensions and chiral fields which couple to them are defined as the 2nd generation. The suitable fermion mass hierarchies are generated by integrating out these vector-like heavy fields.

  • fermion mass hierarchy in the Grand Unified Theory on s_1 z_2 times z_2 orbifold
    arXiv: High Energy Physics - Phenomenology, 2001
    Co-Authors: Naoyuki Haba, Yasuhiro Shimizu, Tomoharu Suzuki, Kazumasa Ukai
    Abstract:

    We suggest a simple Grand Unified Theory where the fifth dimensional coordinate is compactified on an $S_1/(Z_2 \times Z_2')$ orbifold. This model is based on the supersymmetric flipped $SU(5) \times U(1)$ Grand Unified Theory, which can realize not only the triplet-doublet splitting but also the natural fermion mass hierarchies. The triplet-doublet splitting is realized by $S_1/(Z_2 \times Z_2')$ orbifolding, which also reduces the gauge group as $SU(5) \times U(1) \to SU(3)_c \times SU(2)_L \times U(1)_Z \times U(1)_X$. The suitable fermion mass hierarchies are generated by integrating out extra three sets of vector-like heavy fields which can propagate in five dimensions. The radiative corrections to the large Yukawa coupling of right-handed neutrinos can reduce the gauge group to $SU(3)_c \times SU(2)_L \times U(1)_Y$.

Francesco Vissani - One of the best experts on this subject based on the ideXlab platform.

  • minimal supersymmetric Grand Unified Theory symmetry breaking and the particle spectrum
    Physical Review D, 2004
    Co-Authors: Borut Bajc, Alejandra Melfo, Goran Senjanovic, Francesco Vissani
    Abstract:

    We discuss in detail the symmetry breaking and related issues in the minimal renormalizable supersymmetric Grand Unified Theory. We find all the possible patterns of symmetry breaking, compute the associated particle spectrum and study its impact on the physical scales of the Theory. In particular, the complete mass matrices of the $\mathrm{SU}(2)$ doublets and the color triplets are computed in connection with the doublet-triplet splitting and the $d=5$ proton decay. We explicitly construct the two light Higgs doublets as a function of the Higgs superpotential parameters. This provides a framework for the analysis of phenomenological implications of the Theory, to be carried out in a second paper.

  • Minimal supersymmetric Grand Unified Theory: Symmetry breaking and the particle spectrum
    Physical Review D, 2004
    Co-Authors: Borut Bajc, Alejandra Melfo, Goran Senjanovic, Francesco Vissani
    Abstract:

    We discuss in detail the symmetry breaking and related issues in the minimal renormalizable supersymmetric Grand Unified Theory. We compute the particle spectrum and study its impact on the physical scales of the Theory. This provides a framework for the analysis of phenomenological implications of the Theory, to be carried out in part II.Comment: 21 pages, 1 figur

  • The minimal supersymmetric Grand Unified Theory
    Physics Letters B, 2004
    Co-Authors: Charanjit S. Aulakh, Borut Bajc, Alejandra Melfo, Goran Senjanovic, Francesco Vissani
    Abstract:

    Abstract We show that the minimal renormalizable supersymmetric SO(10) GUT with the usual three generations of spinors has a Higgs sector consisting only of a “light” 10 dimensional and “heavy” 126 , 126 and 210 supermultiplets. The Theory has only two sets of Yukawa couplings with fifteen real parameters and ten real parameters in the Higgs superpotential. It accounts correctly for all the fermion masses and mixings, neutrinos included. The Theory predicts at low energies the MSSM with exact R-parity. It is arguably the minimal consistent supersymmetric Grand Unified Theory.

Borut Bajc - One of the best experts on this subject based on the ideXlab platform.

  • Challenging the minimal supersymmetric SU(5) model
    2013
    Co-Authors: Borut Bajc, Stephane Lavignac, Timon Mede
    Abstract:

    We review the main constraints on the parameter space of the minimal renormalizable supersymmetric SU(5) Grand Unified Theory. They consist of the Higgs mass, proton decay, electroweak symmetry breaking and fermion masses. Superpartner masses are constrained both from below and from above, giving hope for confirming or definitely ruling out the Theory in the future. This contribution is based on Ref. [1].

  • minimal supersymmetric Grand Unified Theory symmetry breaking and the particle spectrum
    Physical Review D, 2004
    Co-Authors: Borut Bajc, Alejandra Melfo, Goran Senjanovic, Francesco Vissani
    Abstract:

    We discuss in detail the symmetry breaking and related issues in the minimal renormalizable supersymmetric Grand Unified Theory. We find all the possible patterns of symmetry breaking, compute the associated particle spectrum and study its impact on the physical scales of the Theory. In particular, the complete mass matrices of the $\mathrm{SU}(2)$ doublets and the color triplets are computed in connection with the doublet-triplet splitting and the $d=5$ proton decay. We explicitly construct the two light Higgs doublets as a function of the Higgs superpotential parameters. This provides a framework for the analysis of phenomenological implications of the Theory, to be carried out in a second paper.

  • Minimal supersymmetric Grand Unified Theory: Symmetry breaking and the particle spectrum
    Physical Review D, 2004
    Co-Authors: Borut Bajc, Alejandra Melfo, Goran Senjanovic, Francesco Vissani
    Abstract:

    We discuss in detail the symmetry breaking and related issues in the minimal renormalizable supersymmetric Grand Unified Theory. We compute the particle spectrum and study its impact on the physical scales of the Theory. This provides a framework for the analysis of phenomenological implications of the Theory, to be carried out in part II.Comment: 21 pages, 1 figur

  • The minimal supersymmetric Grand Unified Theory
    Physics Letters B, 2004
    Co-Authors: Charanjit S. Aulakh, Borut Bajc, Alejandra Melfo, Goran Senjanovic, Francesco Vissani
    Abstract:

    Abstract We show that the minimal renormalizable supersymmetric SO(10) GUT with the usual three generations of spinors has a Higgs sector consisting only of a “light” 10 dimensional and “heavy” 126 , 126 and 210 supermultiplets. The Theory has only two sets of Yukawa couplings with fifteen real parameters and ten real parameters in the Higgs superpotential. It accounts correctly for all the fermion masses and mixings, neutrinos included. The Theory predicts at low energies the MSSM with exact R-parity. It is arguably the minimal consistent supersymmetric Grand Unified Theory.

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