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1.
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Wormhole-Induced ALP Dark Matter
/ Cheong, Dhong Yeon (IPAP, Seoul ; Yonsei U.) ; Hamaguchi, Koichi (Tokyo U. ; Tokyo U., IPMU) ; Kanazawa, Yoshiki (Tokyo U.) ; Lee, Sung Mook (CERN) ; Nagata, Natsumi (Tokyo U.) ; Park, Seong Chan (IPAP, Seoul ; Yonsei U. ; Korea Inst. Advanced Study, Seoul)
Non-perturbative gravitational effects induce explicit global symmetry breaking terms within axion models. [...]
CERN-TH-2024-195 ; arXiv:2411.07713.
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25.
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2.
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Electroweak Loop Contributions to the Direct Detection of Wino Dark Matter
/ Ellis, John (King's Coll. London ; CERN) ; Nagata, Natsumi (Tokyo U.) ; Olive, Keith A. (Minnesota U.) ; Zheng, Jiaming (Shanghai Jiaotong U., INPAC)
Electroweak loop corrections to the matrix elements for the spin-independent scattering of cold dark matter particles on nuclei are generally small, typically below the uncertainty in the local density of cold dark matter. However, as shown in this paper, there are instances in which the electroweak loop corrections are relatively large, and change significantly the spin-independent dark matter scattering rate. [...]
arXiv:2305.13837; KCL-PH-TH/2023-27; CERN-PH-TH-2023-083; FTPI-MINN-23/08; UMN-TH-4214/23.-
2024-01-04 - 17 p.
- Published in : Eur. Phys. J. C 84 (2024) 4
Fulltext: document - PDF; 2305.13837 - PDF;
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3.
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Axion quality problem and nonminimal gravitational coupling in the Palatini formulation
/ Cheong, Dhong Yeon (IPAP, Seoul ; Yonsei U.) ; Hamaguchi, Koichi (Tokyo U. ; Tokyo U., IPMU) ; Kanazawa, Yoshiki (Tokyo U.) ; Lee, Sung Mook (IPAP, Seoul ; Yonsei U. ; CERN) ; Nagata, Natsumi (Tokyo U.) ; Park, Seong Chan (IPAP, Seoul ; Yonsei U. ; Korea Inst. Advanced Study, Seoul)
In axion models, the global U(1) Peccei-Quinn (PQ) symmetry is explicitly broken by non-perturbative effects of gravity, such as axionic wormholes. The gravitational violation of the PQ symmetry due to wormholes is large enough to invalidate the PQ mechanism, which is entitled as the axion quality problem. [...]
arXiv:2210.11330; CERN-TH-2022-167.-
2023-07-01 - 7 p.
- Published in : Phys. Rev. D 108 (2023) 015007
Fulltext: 2210.11330 - PDF; Publication - PDF;
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4.
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Flipped SU(5) GUT phenomenology: proton decay and $\mathbf {g_\mu - 2}$
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Tsung-Dao Lee Inst., Shanghai) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We consider proton decay and $g_\mu - 2$ 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 $M_{in}$ above the standard GUT scale where the QCD and electroweak SU(2) couplings unify. [...]
arXiv:2110.06833; KCL-PH-TH/2021-76; CERN-TH-2021-154; ACT-4-21; MI-HET-765,
UMN-TH-4105/21; FTPI-MINN-21/22.-
2021-12-15 - 26 p.
- Published in : Eur. Phys. J. C 81 (2021) 1109
Fulltext: document - PDF; 2110.06833 - PDF;
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5.
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Flipped ${g_\mu - 2}$
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiao Tong U.) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (Texas A-M ; Baylor U. ; HARC, Woodlands ; Athens Academy ; Athens U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We analyze the possible magnitude of the supersymmetric contribution to $g_\mu - 2$ in a flipped SU(5) GUT model. Unlike other GUT models which are severely constrained by universality relations, in flipped SU(5) the U(1) gaugino mass and the soft supersymmetry-breaking masses of right-handed sleptons are unrelated to the other gaugino, slepton and squark masses. [...]
arXiv:2107.03025; KCL-PH-TH/2021-46,CERN-TH-2021-099; ACT-1-21; MI-HET-751,
UMN-TH-4018/21; FTPI-MINN-21/11.-
2021-12-07 - 10 p.
- Published in : Eur. Phys. J. C 81 (2021) 1079
Fulltext: 2107.03025 - PDF; document - PDF;
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6.
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A Minimal Supersymmetric SU(5) Missing-Partner Model
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Tsung-Dao Lee Inst., Shanghai) ; Nagata, Natsumi (Tokyo U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We explore a missing-partner model based on the minimal SU(5) gauge group with $\bf{75}$, $\bf{50}$ and $\bf{\overline{50}}$ Higgs representations, assuming a super-GUT CMSSM scenario in which soft supersymmetry-breaking parameters are universal at some high scale $M_{\rm in}$ above the GUT scale $M_{\rm GUT}$. We identify regions of parameter space that are consistent with the cosmological dark matter density, the measured Higgs mass and the experimental lower limit on $\tau(p \to K^+ \nu)$. [...]
arXiv:2103.15430.-
2021-06-24 - 30 p.
- Published in : Eur. Phys. J. C 81 (2021) 543
Fulltext: document - PDF; 2103.15430 - PDF;
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7.
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Low-Energy Probes of No-Scale SU(5) Super-GUTs
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Shanghai Jiao Tong U.) ; Nagata, Natsumi (Tokyo U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Velasco-Sevilla, L. (Bergen U. ; Korea Inst. Advanced Study, Seoul)
We explore the possible values of the $\mu \to e \gamma$ branching ratio, $\text{BR}(\mu\rightarrow e\gamma)$, and the electron dipole moment (eEDM), $d_e$, in no-scale SU(5) super-GUT models with the boundary conditions that soft supersymmetry-breaking matter scalar masses vanish at some high input scale, $M_{\rm in}$, above the GUT scale, $M_{\rm GUT}$. We take into account the constraints from the cosmological cold dark matter density, $\Omega_{CDM} h^2$, the Higgs mass, $M_h$, and the experimental lower limit on the lifetime for $p \to K^+ \bar \nu$, the dominant proton decay mode in these super-GUT models. [...]
arXiv:2011.03554; KCL-PH-TH/2020-61; CERN-TH-2020-172; UMN-TH-4002/20; FTPI-MINN-20/33.-
2021-02-04 - 45 p.
- Published in : Eur. Phys. J. C 81 (2021) 120
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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8.
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Building Models of Inflation in No-Scale Supergravity
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Garcia, Marcos A.G. (Madrid, IFT) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos Dimitri V. (TAMU, College Station ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U.) ; Verner, Sarunas (Minnesota U.)
After reviewing the motivations for cosmological inflation formulated in the formalism of supersymmetry, we argue that the appropriate framework is that of no-scale supergravity. We then show how to construct within this framework inflationary models whose predictions for the tilt in the spectrum of scalar perturbations, $n_s$, and the ratio, $r$, of tensor and scalar perturbations coincide with those of the $R + R^2$ model of inflation proposed by Starobinsky. [...]
arXiv:2009.01709; KCL-PH-TH/2020-44; CERN-TH-2020-136; ACT-6-20; MI-TH-2024, UMN-TH-3926/20; MI-TH-2024,
UMN-TH-3926/20; FTPI-MINN-20/29; IFT-UAM/CSIC-20-126.-
2020-10-22 - 85 p.
- Published in : Int. J. Mod. Phys. D 29 (2020) 2030011
Fulltext: PDF;
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Proton Decay: Flipped vs Unflipped SU(5)
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Garcia, Marcos A.G. (Madrid, IFT) ; Nagata, Natsumi (Tokyo U. ; HARC, Woodlands ; Athens Academy) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We analyze nucleon decay modes in a no-scale supersymmetric flipped SU(5) GUT model, and contrast them with the predictions for proton decays via dimension-6 operators in a standard unflipped supersymmetric SU(5) GUT model. We find that these GUT models make very different predictions for the ratios $\Gamma(p \to \pi^0 \mu^+)/\Gamma(p \to \pi^0 e^+)$, $\Gamma(p \to \pi^+ \bar{\nu})/\Gamma(p \to \pi^0 e^+)$, $\Gamma(p \to K^0 e^+)/\Gamma(p \to \pi^0 e^+)$ and $\Gamma(p \to K^0 \mu^+)/\Gamma(p \to \pi^0 \mu^+)$, and that predictions for the ratios $\Gamma(p \to \pi^0 \mu^+)/\Gamma(p \to \pi^0 e^+)$ and $\Gamma(p \to \pi^+ \bar{\nu})/\Gamma(p \to \pi^0 e^+)$ also differ in variants of the flipped SU(5) model with normal- or inverse-ordered light neutrino masses. [...]
arXiv:2003.03285; KCL-PH-TH/2020-10; CERN-TH-2020-031; UT-20-03; ACT-01-20; MI-TH-206, UMN-TH-3914/20; MI-TH-206,
UMN-TH-3914/20; FTPI-MINN-20/04; IFT-UAM/CSIC-20-36.-
2020-05-06 - 25 p.
- Published in : JHEP 2005 (2020) 021
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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10.
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Supersymmetric Proton Decay Revisited
/ Ellis, John (King's Coll. London (main) ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Korea Inst. Advanced Study, Seoul ; Tsung-Dao Lee Inst., Shanghai) ; Nagata, Natsumi (Tokyo U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Velasco-Sevilla, Liliana (Bergen U.)
Encouraged by the advent of a new generation of underground detectors---JUNO, DUNE and Hyper-Kamiokande---that are projected to improve significantly on the present sensitivities to various baryon decay modes, we revisit baryon decay in the minimal supersymmetric SU(5) GUT. We discuss the phenomenological uncertainties associated with hadronic matrix elements and the value of the strong coupling $\alpha_s$---which are the most important---the weak mixing angle $\theta_W$, quark masses including one-loop renormalization effects, quark mixing and novel GUT phases that are not visible in electroweak interaction processes. [...]
arXiv:1912.04888; KCL-PH-TH/2019-91; CERN-TH-2019-216; UT-19-30; UMN-TH-3907/19; FTPI-MINN-19/28; UMN-TH-3907/19,
FTPI-MINN-19/28.-
2020-04-21 - 30 p.
- Published in : Eur. Phys. J. C 80 (2020) 332
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
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