Supersymmetry hierarchy problems and anomalous horizontal U(1) symmetry

Choi, Kiwoon; Chun, Eung Jin; Kim, Hyungdo

doi:10.1016/s0370-2693(96)01674-7

Cited by 46 publications

(17 citation statements)

References 31 publications

(47 reference statements)

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“…If R is not conserved, sparticles may be produced singly and the LSP is not stable and would not provide a possible explanation of CDM. Mechanisms which mimic approximate R-parity conservation are known and usually based on a supersymmetric Froggatt-Nielsen model which assumes a spontaneously broken horizontal local U (1) X symmetry [358,359,360,361,362,363,364,365].…”

Section: Supersymmetrymentioning

confidence: 99%

The muon g−2

2009

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The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics. In a recent experiment at Brookhaven it has been measured with a remarkable 14-fold improvement of the previous CERN experiment reaching a precision of 0.54ppm. Since the first results were published, a persisting "discrepancy" between theory and experiment of about 3 standard deviations is observed. It is the largest "established" deviation from the Standard Model seen in a "clean" electroweak observable and thus could be a hint for New Physics to be around the corner. This deviation triggered numerous speculations about the possible origin of the "missing piece" and the increased experimental precision animated a multitude of new theoretical efforts which lead to a substantial improvement of the prediction of the muon anomaly aµ = (gµ − 2)/2. The dominating uncertainty of the prediction, caused by strong interaction effects, could be reduced substantially, due to new hadronic cross section measurements in electron-positron annihilation at low energies. Also the recent electron g − 2 measurement at Harvard contributes substantially to the progress in this field, as it allows for a much more precise determination of the fine structure constant α as well as a cross check of the status of our theoretical understanding.In this report we review the theory of the anomalous magnetic moments of the electron and the muon. After an introduction and a brief description of the principle of the muon g − 2 experiment, we present a review of the status of the theoretical prediction and in particular discuss the role of the hadronic vacuum polarization effects and the hadronic light-by-light scattering correction, including a new evaluation of the dominant pion-exchange contribution. In the end, we find a 3.2 standard deviation discrepancy between experiment and Standard Model prediction. We also present a number of examples of how extensions of the electroweak Standard Model would change the theoretical prediction of the muon anomaly aµ. Perspectives for future developments in experiment and theory are briefly discussed and critically assessed. The muon g − 2 will remain one of the hot topics for further investigations.

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Section: Supersymmetrymentioning

confidence: 99%

The muon g−2

2009

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“…ξ ∼ 1 and Λ ∼ 10 14 GeV. Alternatively, Λ can be of order TeV, but m ν is small because ξ is small due to small couplings in the underlying dynamics which may be a consequence of some flavor symmetries [20], e.g. ξ ∼ 10 −11 and Λ ∼ 1 TeV.…”

Section: L-violating Operatorsmentioning

confidence: 99%

“…If ββ 0ν is induced dominantly by (m ν ) ee , one finds [1] (20) In case that ββ 0ν is dominated by one of d ≥ 7 operators in section II, the resulting τ…”

Section: Constraints From ββ 0νmentioning

confidence: 99%

Operator analysis of neutrinoless double beta decay

2002

Self Cite

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We study the effective operators of the standard model fields which would yield an observable rate of neutrinoless double beta decay. We particularly focus on the possibility that neutrinoless double beta decay is dominantly induced by lepton-number-violating higher dimensional operators other than the Majorana neutrino mass. Our analysis can be applied to models in which neutrinoless double beta decay is induced either by a strong dynamics or by quantum gravity effects at a fundamental scale near the TeV scale as well as the conventional models in which neutrinoless double beta decay is induced by perturbative renormalizable interactions.

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“…We wish to understood this in terms of the boundary states defined at (5.19). For generic L the branes are defined as 29) with the integers ρ, ρ specifying a character of the untwisted stabilizer Z 8 × Z 4 . When some L c 's coincide with k c /2, then the sum over orbifold images is partially translated into the sum over shifts of (ρ, ρ ) due to (5.21).…”

Section: Jhep01(2007)081mentioning

confidence: 99%

“…One of our goal in this paper is to give a general prescription to construct permutation orientifolds in tensor product CFTs as well as their orbifolds, generalizing the standard construction of crosscap states in RCFT given by [28] and developed further by [29]- [36].…”

Section: Introductionmentioning

confidence: 99%

Permutation orientifolds of Gepner models

Hosomichi

2007

J. High Energy Phys.

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In tensor products of a left-right symmetric CFT, one can define permutation orientifolds by combining orientation reversal with involutive permutation symmetries. We construct the corresponding crosscap states in general rational CFTs and their orbifolds, and study in detail those in products of affine U(1)2 models or N = 2 minimal models. The results are used to construct permutation orientifolds of Gepner models. We list the permutation orientifolds in a few simple Gepner models, and study some of their physical properties -supersymmetry, tension and RR charges. We also study the action of corresponding parity on D-branes, and determine the gauge group on a stack of parity-invariant D-branes. Tadpole cancellation condition and some of its solutions are also presented.

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Supersymmetry hierarchy problems and anomalous horizontal U(1) symmetry

Cited by 46 publications

References 31 publications

The muon g−2

The muon g−2

Operator analysis of neutrinoless double beta decay

Permutation orientifolds of Gepner models

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