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Naturalness

About: Naturalness is a research topic. Over the lifetime, 1305 publications have been published within this topic receiving 31737 citations.


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TL;DR: In this paper, the topology of the universe is shown to be compact and the likelihood of its present state of high isotropy and near flatness arising from generic initial conditions.
Abstract: If the topology of the universe is compact we show how it significantly changes our assessment of the naturalness of the observed structure of the universe and the likelihood of its present state of high isotropy and near flatness arising from generic initial conditions. We also identify the most general cosmological models with compact space.

22 citations

Journal ArticleDOI
Stacy Kim1
TL;DR: In this paper , the authors examined how study participants from the German-speaking region of Switzerland (N = 534) assessed the environmental friendliness, healthiness and naturalness of 20 protein-rich foods, including meat, fish, cheese and a diverse set of meat substitutes.

22 citations

Journal ArticleDOI
TL;DR: In this article, the question of naturalness of supersymmetry breaking models is addressed in the context of gauge-median supersymmetric standard models, where the right-handed selectron mass in these models is bounded.
Abstract: The question of naturalness is addressed in the context of gauge-mediated supersymmetry-breaking models. Requiring that M{sub Z} arises naturally imposes upper limits on the right-handed selectron mass in these models that are stronger than in the minimal supersymmetric standard model and are interesting from the point of view of searches at the current and future colliders. {copyright} {ital 1997} {ital The American Physical Society}

21 citations

Journal ArticleDOI
TL;DR: In this article, a predictive model for explaining the apparent deviation of the muon anomalous magnetic moment from the Standard Model expectation is proposed, and the model provides a calculable example violating the Wilsonian notion of naturalness.
Abstract: We study a predictive model for explaining the apparent deviation of the muon anomalous magnetic moment from the Standard Model expectation. There are no new scalars and hence no new hierarchy puzzles beyond those associated with the Higgs; the only new particles at the TeV scale are vector-like singlet and doublet leptons. Interestingly, this simple model provides a calculable example violating the Wilsonian notion of naturalness: despite the absence of any symmetries prohibiting its generation, the coefficient of the naively leading dimension-six operator for (g − 2) vanishes at one-loop. While effective field theorists interpret this either as a surprising UV cancellation of power divergences, or as a delicate cancellation between matching UV and calculable IR corrections to (g − 2) from parametrically separated scales, there is a simple explanation in the full theory: the loop integrand is a total derivative of a function vanishing in both the deep UV and IR. The leading contribution to (g − 2) arises from dimension-eight operators, and thus the required masses of new fermions are lower than naively expected, with a sizeable portion of parameter space already covered by direct searches at the LHC. The viable parameter space free of fine-tuning for the muon mass will be fully covered by future direct LHC searches, and all of the parameter space can be probed by precision measurements at planned future lepton colliders.

21 citations

Journal ArticleDOI
TL;DR: In this article, the authors examine how current LHC results constrain naturalness in three classes of models that may relax LHC bounds on sparticles: split families, baryonic RPV, and Dirac gauginos.
Abstract: Direct LHC bounds on colored SUSY particles now corner naturalness more than the measured value of the Higgs mass does. Bounds on the gluino are of particular importance, since it radiatively "sucks" up the stop and Higgs-up soft masses. As a result, even models that easily accommodate a 125 GeV Higgs are almost as tuned as the simplest version of SUSY, the MSSM: at best at the percent level. In this paper, we further examine how current LHC results constrain naturalness in three classes of models that may relax LHC bounds on sparticles: split families, baryonic RPV, and Dirac gauginos. In models of split families and bRPV, the bounds on the gluino are only slightly reduced, resulting in a few percent tuning. In particular, having a natural spectrum in bRPV models typically implies that tops, Ws, and Zs are easily produced in the cascade decays of squarks and gluinos. The resulting leptons and missing energy push the gluino mass limit above 1 TeV. Even when the gluino has a Dirac mass and does not contribute to the stop mass at one loop, tuning reappears in calculable models because there is no symmetry imposing the supersoft limit. We conclude that, even if sparticles are found at LHC-14, naturalness will not emerge triumphant.

21 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023282
2022610
202182
202063
201983
201852