Observable proton decay in flipped SU(5)

Mehmood, Maria; Rehman, Mansoor Ur; Shafi, Qaisar

doi:10.1007/jhep02(2021)181

Cited by 15 publications

(15 citation statements)

References 69 publications

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“…As we have seen previously, the stau LSP region recedes to larger values of m 1/2 as M in increases, and is not visible in the right panel where M in = M P . We see very large values of χ h 2 in the bulk of the uncoloured region, 10 but there are strips close to the boundaries of the shaded regions where χ h 2 is reduced. Once again, the thick blue shaded contour running along the stop LSP region corresponds to h 2 = 0.1.…”

Section: Universal Boundary Conditionsmentioning

confidence: 81%

“…The flipped SU(5) Grand Unified Theory (GUT) was first proposed in [1,2], as a possible intermediate gauge group obtained from the breaking of an underlying SO (10) GUT group. Flipped SU (5) was subsequently investigated in [3] as a GUT group in its own right, independently of a posa e-mail: olive@umn.edu (corresponding author) sible SO (10) parent group. Gauge coupling unification and the predictions for sin 2 θ W in flipped SU(5) models with and without supersymmetry were also studied in [3].…”

Section: Introductionmentioning

confidence: 99%

“…One was that breaking the initial GUT symmetry down to the Standard Model (SM) SU( 3)×SU( 2)×U(1) gauge group via 10 and 10 Higgs representations led to suppression of proton decay via dimension-5 operators thanks to an economical missing-partner mechanism. It was also argued that flipped SU (5) would fit naturally into string theory, as weakly-coupled string models could not accommodate the adjoint and larger Higgs representations required to break other GUT groups such as SU (5), SO (10) and E 6 , but could accommodate the 10 and 10 of flipped SU (5). Indeed, variants of flipped SU (5) were subsequently derived in the fermionic formulation of weakly-coupled heterotic string theory [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Following the formulation of flipped SU (5) and its derivation from string theory, there have been many phenomenological studies of the model. These have included such particlephysics topics as proton decay [9][10][11] and neutrino masses and mixing [12][13][14][15], as well as cosmological issues such as dark matter [16,17], baryogenesis, inflation and entropy generation [13][14][15][18][19][20][21][22]. The upshot of these studies is that flipped SU (5) can provide a complete framework for particle physics and cosmology below the Planck scale.…”

Section: Introductionmentioning

confidence: 99%

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Flipped SU(5) GUT phenomenology: proton decay and $$\mathbf {g_\mu - 2}$$

et al. 2021

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We consider proton decay and $$g_\mu - 2$$ g μ - 2 in flipped SU(5) GUT models. We first study scenarios in which the soft supersymmetry-breaking parameters are constrained to be universal at some high scale $$M_{in}$$ M in above the standard GUT scale where the QCD and electroweak SU(2) couplings unify. In this case the proton lifetime is typically $$ > rsim 10^{36}$$ ≳ 10 36 years, too long to be detected in the foreseeable future, and the supersymmetric contribution to $$g_\mu - 2$$ g μ - 2 is too small to contribute significantly to resolving the discrepancy between the experimental measurement and data-driven calculations within the Standard Model. However, we identify a region of the constrained flipped SU(5) parameter space with large couplings between the 10- and 5-dimensional GUT Higgs representations where $$p \rightarrow e^+ \pi ^0$$ p → e + π 0 decay may be detectable in the Hyper-Kamiokande experiment now under construction, though the contribution to $$g_\mu -2$$ g μ - 2 is still small. A substantial contribution to $$g_\mu - 2$$ g μ - 2 is possible, however, if the universality constraints on the soft supersymmetry-breaking masses are relaxed. We find a ‘quadrifecta’ region where observable proton decay co-exists with a (partial) supersymmetric resolution of the $$g_\mu - 2$$ g μ - 2 discrepancy and acceptable values of $$m_h$$ m h and the relic LSP density.

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Section: Universal Boundary Conditionsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flipped SU(5) GUT phenomenology: proton decay and $$\mathbf {g_\mu - 2}$$

et al. 2021

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“…Proton decay mediated by colored Higgsinos in supersymmetric grand unified theories (SUSY GUTs) [1,2], called dimension-five proton decay, is a primary target in the proton decay searches at HyperKamiokande [3], JUNO [4], and DUNE [5,6]. This is because the GUT gauge boson mass is predicted to be ∼ 2 • 10 16 GeV in usual SUSY GUTs and the corresponding partial width of GUT gauge boson-mediated proton decay is out of the sensitivity ranges of the above experiments (however, proton decay mediated by (3, 2, 1/6) gauge boson in SUSY SO (10) GUT can be accessible [7]). In non-SUSY GUTs, GUT gauge boson-mediated proton decay can be within the experimental reach, and one can even set upper bounds on the proton lifetime in some cases [8].…”

Section: Introductionmentioning

confidence: 99%

Moderately suppressed dimension-five proton decay in a flipped SU(5) model

Haba

Yamada

2022

J. High Energ. Phys.

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We study colored Higgsino-mediated proton decay (dimension-five proton decay) in a model based on the flipped SU(5) GUT. In the model, the GUT-breaking 10, $$ \overline{\mathbf{10}} $$ 10 ¯ fields have a GUT-scale mass term and gain VEVs through higher-dimensional operators, which induces an effective mass term between the color triplets in the 5, $$ \overline{\mathbf{5}} $$ 5 ¯ Higgs fields that is not much smaller than the GUT scale. This model structure gives rise to observable dimension-five proton decay, and at the same time achieves moderate suppression on dimension-five proton decay that softens the tension with the current bound on Γ(p → K+$$ \overline{\nu} $$ ν ¯ ). We investigate the flavor dependence of the Wilson coefficients of the operators relevant to dimension-five proton decay, by relating them with diagonalized Yukawa couplings and CKM matrix components in MSSM, utilizing the fact that the GUT Yukawa couplings are in one-to-one correspondence with the MSSM Yukawa couplings in flipped models. Then we numerically evaluate the Wilson coefficients, and predict the distributions of the ratios of the partial widths of various proton decay modes.

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Flipped SU(5): unification, proton decay, fermion masses and gravitational waves

King,

Leontaris,

Zhou

2024

J. High Energ. Phys.

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We study supersymmetric (SUSY) flipped SU(5) × U(1) unification, focussing on its predictions for proton decay, fermion masses and gravitational waves. We performed a two-loop renormalisation group analysis and showed that the SUSY flipped SU(5) model predicts a high GUT scale MGUT> 1016 GeV. We also investigated the restrictions on the MB−L scale which is associated with the U(1)χ breaking scale. We found that the MB−L scale can vary in a broad region with negligible or little effect on the value of MGUT. Proton decay in this model is induced by dimension-6 operators only. The dimension-5 operator induced by SUSY contribution is suppressed due to the missing partner mechanism. We found that the partial decay width p → π0e+ is high suppressed, being at least one order of magnitude lower than the future Hyper-K sensitivity. We also studied fermion (including neutrino) masses and mixings which can also influence proton decay. We presented two scenarios of flavour textures to check the consistency of the results with fermion masses and mixing. The B − L gauge breaking leads to the generation of cosmic strings. The B − L scale here is not constrained by gauge coupling unification. If this scale is very close that of GUT breaking, strings can be unstable due to the decay to monopole-antimonople pair. Such metastable strings can be used to explain the NANOGrav signals of stochastic gravitational wave background, which may be interpreted here as resulting from the decay of metastable cosmic strings.

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Observable proton decay in flipped SU(5)

Cited by 15 publications

References 69 publications

Flipped SU(5) GUT phenomenology: proton decay and $$\mathbf {g_\mu - 2}$$

Flipped SU(5) GUT phenomenology: proton decay and $$\mathbf {g_\mu - 2}$$

Moderately suppressed dimension-five proton decay in a flipped SU(5) model

Flipped SU(5): unification, proton decay, fermion masses and gravitational waves

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