Theory review of the muon<i>g</i>− 2

Melnikov, Kirill

doi:10.1051/epjconf/201611801020

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…For further recent theoretical progress on QED and hadronic contributions and reviews, see Refs [12,13],[14][15][16][17][18][19][20][21][22],. and[23][24][25][26][27], respectively.…”

mentioning

confidence: 99%

The muon magnetic moment in the 2HDM: complete two-loop result

Cherchiglia

Kneschke

Stöckinger

et al. 2017

J. High Energ. Phys.

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Abstract:We study the 2HDM contribution to the muon anomalous magnetic moment a µ and present the complete two-loop result, particularly for the bosonic contribution. We focus on the Aligned 2HDM, which has general Yukawa couplings and contains the type I, II, X, Y models as special cases. The result is expressed with physical parameters: three Higgs boson masses, Yukawa couplings, two mixing angles, and one quartic potential parameter. We show that the result can be split into several parts, each of which has a simple parameter dependence, and we document their general behavior. Taking into account constraints on parameters, we find that the full 2HDM contribution to a µ can accommodate the current experimental value, and the complete two-loop bosonic contribution can amount to (2 · · · 4) × 10 −10 , more than the future experimental uncertainty.

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“…For further recent theoretical progress on QED and hadronic contributions and reviews, see Refs [12,13],[14][15][16][17][18][19][20][21][22],. and[23][24][25][26][27], respectively.…”

mentioning

confidence: 99%

The muon magnetic moment in the 2HDM: complete two-loop result

Cherchiglia

Kneschke

Stöckinger

et al. 2017

J. High Energ. Phys.

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“…As a result, its determination is not straightforward and has a rather volatile history (see ref. [150]). In this case, the loop integral is dominated single mesons (π 0 , η, η ) but, since they couple to virtual photons, their time-like form factors at low Q 2 values are involved.…”

Section: Experimental Input For Data-driven Hlbl Determinationsmentioning

confidence: 99%

New Physics Searches at the BESIII Experiment

Olsen¹

2021

Preprint

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The Standard Model (SM) of particle physics, comprised of the unified electro-weak (EW) and Quantum Chromodynamic (QCD) theories, accurately explains almost all experimental results related to the micro-world, and has made a number of predictions for previously unseen particles, most notably the Higgs scalar boson, that were subsequently discovered. As a result, the SM is currently universally accepted as the theory of the fundamental particles and their interactions. However, in spite of its numerous successes, the SM has a number of apparent shortcomings including: many free parameters that must be supplied by experimental measurements; no mechanism to produce the dominance of matter over antimatter in the universe; and no explanations for gravity, the dark matter in the universe, neutrino masses, the number of particle generations, etc. Because of these shortcomings, there is considerable incentive to search for evidence for new, non-SM physics phenomena that might provide important clues about what a new, beyond the SM theory (BSM) might look like. Although the center-of-mass energies that BESIII can access are far below the energy frontier, searches for new, BSM physics are an important component of its research program. Here we describe ways that BESIII looks for signs of BSM physics by measuring rates for processes that the SM predicts to be forbidden or very rare, searching for non-SM particles such as dark photons, making precision tests of SM predictions, and looking for violations of the discrete symmetries C and CP in processes for which the SM-expectations are immeasurably small.

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“…From the theoretical viewpoint, the known uncertainty is well controlled and nobody doubts this could be producing the anomaly. It is even more likely that a mistake on the experimental side is being responsible for this or that several ingredients appearing in the theory predictions are not fully understood and possibly correlated [67][68][69]. About all, the more desirable and expected explanation to this anomaly is some physics beyond the SM [70].…”

Section: Lfv Constraints From Low-energymentioning

confidence: 99%

Linking LFV Higgs decays $h\to \ell_i \ell_j$ with CP violation in multi-scalar models

Barradas-Guevara,

Diaz-Cruz,

Felix-Beltran

et al. 2017

Preprint

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The study of LFV decays of the Higgs boson, h → i j , has become an active research subject both from the experimental and theoretical points of view. Such decays vanish within the SM and are highly suppressed in several theoretical extensions. Due to its relevance and relative simplicity to reconstruct the signal at future colliders, it is an important tool to probe SM extensions where it could reach detectable levels. Here we identify a mechanism that induces LFV Higgs interactions, by linking it with the appearance of CP violation in the scalar sector, within the context of general multi-Higgs models. We then focus on the simplest model of this type to study its phenomenology.The scalar sector of this minimal model consisting of a Higgs doublet and a Froggatt-Nielsen (FN) (complex) singlet is studied thoroughly, including the scalar spectrum and the Yukawa interactions.Constraints on the parameters of the model are derived from low-energy observables and LHC Higgs data, which is then applied to study the resulting predicted rates for the decay h → τ µ. Overall, branching ratios for h → τ µ of the order 10 −3 are obtained within this approach consistent with all known constraints.

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Theory review of the muong− 2

Abstract: Abstract. I discuss the current situation with the muon anomalous magnetic moment. I argue that a mistake in the theoretical predictions is a very unlikely explanation of the current discrepancy between the Standard Model value of the muon magnetic anomaly and its measured value.

Cited by 5 publications

References 39 publications

The muon magnetic moment in the 2HDM: complete two-loop result

The muon magnetic moment in the 2HDM: complete two-loop result

New Physics Searches at the BESIII Experiment

Linking LFV Higgs decays $h\to \ell_i \ell_j$ with CP violation in multi-scalar models

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