Grand unification in high-scale supersymmetry

Hisano, Junji; Kuwahara, Takumi; Nagata, Natsumi

doi:10.1016/j.physletb.2013.05.017

Cited by 53 publications

(62 citation statements)

References 62 publications

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“…Furthermore, heavier gaugino masses than the EW scale decrease the GUT scale Λ G . This means that the proton decay rate may be enhanced in our model [9,16], and could be tested at the future proton decay searches.…”

Section: Gauge Coupling Unificationmentioning

confidence: 96%

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Flavor violating Z' from SO(10) SUSY GUT in High-Scale SUSY

Omura¹

2016

Proceedings of Flavor Physics &Amp; CP Violation 2015 — PoS(FPCP2015)

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We propose an SO(10) supersymmetric grand unified theory (SUSY GUT), where the SO(10) gauge symmetry breaks down to SU (3) c × SU (2) L × U (1) Y × U (1) X at the GUT scale and U (1) X is radiatively broken at the SUSY-braking scale. In order to achieve the observed Higgs mass around 126 GeV and also to satisfy constraints on flavor-and/or CP-violating processes, we assume that the SUSY-breaking scale is O(100) TeV, so that the U (1) X breaking scale is also O(100) TeV. One big issue in the SO(10) GUTs is how to realize realistic Yukawa couplings. In our model, not only 16-dimensional but also 10-dimensional matter fields are introduced to predict the observed fermion masses and mixings. The Standard-Model quarks and leptons are linear combinations of the 16-and 10-dimensional fields so that the U (1) X gauge interaction may be flavor-violating. We investigate the current constraints on the flavor-violating Z ′ interaction from the flavor physics and discuss prospects for future experiments. 1 I. INTRODUCTIONThe Grand Unified Theories (GUTs) are longstanding hypotheses, and continue to fascinate us because of the excellent explanation of mysteries in the Standard Model (SM). The GUTs unify not only the gauge groups but also quarks and leptons, and reveal the origin of the structure of the SM, such as the hypercharge assignment for the SM particles.The gauge groups in the SM areThe minimal candidate for the unified gauge group is SU(5), which was originally proposed by Georgi and Glashow [1]. There, quarks and leptons belong to 10-and 5-dimensional representations in SU (5), and the SM Higgs doublet is embedded into 5, introducing additional colored Higgs particle. One big issue is the unification of the SM gauge coupling constants, and it could be realized in the supersymmetric (SUSY) extension. It is well-known that the minimal SU(5) SUSY GUT realizes the gauge coupling unification around 2 × 10 16 GeV, if SUSY particle masses are around 1 TeV [2].Another candidate for the unified gauge group would be SO(10). It is non-minimal, but it would be an attractive extension because the SO(10) GUT explains the anomalyfree conditions in the SM. Furthermore, all leptons and quarks, including the right-handed neutrinos, in one generation may belong to one 16-dimensional representation in the minimal setup [3].On the other hand, the GUTs face several problems, especially because of the experimental constraints. One stringent constraint is from nonobservation of proton decay [1,4]. While the GUT scale in the SUSY GUT may be high enough to suppress the proton decay induced by the so-called X-boson exchange, the dimension-five operator generated by the colored Higgs exchange is severely constrained. Another stringent constraint is from the observed fermion masses and mixings. The SU(5) GUT predicts a common mass ratio of down-type quark and charged lepton in each generation. Furthermore, in the SO(10) GUT, the up-type, down-type quarks, and charged lepton in each generation would have common mass ratios if the all mat...

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Section: Gauge Coupling Unificationmentioning

confidence: 96%

“…This type of setup is called the high-scale SUSY [8]. In the high-scale SUSY, the gauge coupling unification is rather improved when only the gaugino masses are around 1 TeV [9], and the dangerous dimension-five proton decay is suppressed [10]. On the other hand, since tan β (the ratio of the VEVs of the two Higgs…”

mentioning

confidence: 99%

Flavor violating Z' from SO(10) SUSY GUT in High-Scale SUSY

Omura¹

2016

Proceedings of Flavor Physics &Amp; CP Violation 2015 — PoS(FPCP2015)

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“…In this section, we estimate these masses using the method discussed in Refs. [24,25,26]. The mass of the heavy particles is determined by first RG running the couplings to the scale where they approximately unify.…”

Section: Mass Spectrum and Coupling Unificationmentioning

confidence: 99%

“…Since the colored triplet Higgs gives threshold corrections to the gauge couplings when integrated out, the quality of the coupling unification determines the mass of the colored triplet Higgs [24,25,26] and so affects the lifetime of the proton. When the colored Higgs is integrated out, it also generates a dimension-five operator proportional to down-type Yukawa couplings which lead to proton decay [27].…”

Section: Introductionmentioning

confidence: 99%

SU(5) grand unification in pure gravity mediation

2015

Self Cite

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We discuss the proton lifetime in pure gravity mediation models with nonuniversal Higgs soft masses. Pure gravity mediation offers a simple framework for studying SU(5) grand unified theories with a split supersymmetry like spectra. We find that for much of the parameter space gauge coupling unification is quite good leading to rather long lifetimes for the proton. However, for m 3/2 ∼ 60 TeV and tan β ∼ 4, for which gauge coupling unification is also good, the proton lifetime is short enough that it could be in reach of future experiments.

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“…On the other hand, the SUSY model has been seriously constrained by the Higgs discovery, in which the Higgs mass is 125 GeV [4][5][6]. Based on this theoretical and experimental situation, we consider the high-scale SUSY models, which have been widely discussed with a great deal of attention [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of High-Scale SUSY in Low Energy Hadronic FCNC

Tanimoto

Yamamoto

2015

Symmetry

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Abstract:We discuss the sensitivity of the high-scale supersymmetry (SUSY) at 10-1000 TeV in B 0 , B s , K 0 and D meson systems together with the neutron electric dipole moment (EDM) and the mercury EDM. In order to estimate the contribution of the squark flavor mixing to these flavor changing neutral currents (FCNCs), we calculate the squark mass spectrum, which is consistent with the recent Higgs discovery. The SUSY contribution in K could be large, around 40% in the region of the SUSY scale 10-100 TeV. The neutron EDM and the mercury EDM are also sensitive to the SUSY contribution induced by the gluino-squark interaction. The predicted EDMs are roughly proportional to | SUSY K |. If the SUSY contribution is the level of O(10%) for K , the neutron EDM is expected to be discovered in the region of 10 −28 -10 −26 ecm. The mercury EDM also gives a strong constraint for the gluino-squark interaction. The SUSY contribution of ∆M D is also discussed.

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Grand unification in high-scale supersymmetry

Cited by 53 publications

References 62 publications

Flavor violating Z' from SO(10) SUSY GUT in High-Scale SUSY

Flavor violating Z' from SO(10) SUSY GUT in High-Scale SUSY

SU(5) grand unification in pure gravity mediation

Sensitivity of High-Scale SUSY in Low Energy Hadronic FCNC

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