The standard model prediction of the muon anomalous magnetic moment

Abstract:We address the impact of sterile fermion states on the anomalous magnetic moment of charged leptons, as well as their contribution to neutrinoless double beta decays. We illustrate our results in a minimal, effective extension of the Standard Model by one sterile fermion state, and in a well-motivated framework of neutrino mass generation, embedding the Inverse Seesaw into the Standard Model. The simple "3+1" effective case succeeds in alleviating the tension related to the muon anomalous magnetic moment, albeit only at the 3σ level, and for light sterile states (corresponding to a cosmologically disfavoured regime). Interestingly, our analysis shows that a future 0ν2β observation does not necessarily imply an inverted hierarchy for the active neutrinos in this simple extension. Although the Inverse Seesaw realisation here addressed could indeed ease the tension in (g − 2) µ , bounds from lepton universality in kaon decays mostly preclude this from happening. However, these scenarios can also have a strong impact on the interpretation of a future 0ν2β signal regarding the hierarchy of the active neutrino mass spectrum.

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“…The SM prediction for a SM µ is generally divided into three contributions [54][55][56][57][58][59],…”

Section: Sterile Neutrinos and Lepton Magnetic Momentsmentioning

confidence: 99%

Effect of steriles states on lepton magnetic moments and neutrinoless double beta decay

Abada

Romeri

Teixeira

2014

J. High Energ. Phys.

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“…The most stringent QED test comes from the high-precision measurements of the e and µ anomalous magnetic moments a l ≡ (g γ l − 2)/2 [65,66,67]. A recent measurement of a e , using a one-electron quantum cyclotron, has reduced the experimental uncertainty by a factor of six [68]: …”

Section: Lepton Magnetic Momentsmentioning

confidence: 99%

Tau Physics 2006: Summary & Outlook

Pich

2007

Nuclear Physics B - Proceedings Supplements

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“…iv) Finally, there is the muon anomalous magnetic moment anomaly. Most recent analyses converge towards a 3σ discrepancy in the 10 −9 range [8]: ∆a µ = a exp µ −a SM µ ≈ (3 ± 1) × 10 −9 where a µ = (g − 2) µ /2. Despite substantial progress both on the experimental [9] and on the theoretical sides, the situation is not completely clear yet.…”

Section: Introductionmentioning

confidence: 98%

Low energy probes of CP violation in a flavor blind MSSM

Altmannshofer¹,

Buras²,

Paradisi³

2008

Physics Letters B

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We analyze the low energy implications of a flavor blind supersymmetric scenario (where the CKM matrix is the only source of flavor violation) in the presence of new CP violating but flavor conserving phases in the soft sector. We find that the best probes of this rather restricted scenario are i) the electric dipole moments (EDMs) of the electron (de) and the neutron (dn) and ii) flavor changing and CP violating processes in B systems, like the CP asymmetries in b → sγ and B → φ(η ′ )KS, i.e. ACP (b → sγ) and S φ(η ′ )K S , respectively. The non-standard values for S φ(η ′ )K S , measured at the B factories, can find a natural explanation within our scenario and this would unambiguously imply i) positive and often large (non-standard) values for ACP (b → sγ) and ii) a lower bound for the electron and neutron EDMs at the level of de,n > ∼ 10 −28 e cm. Moreover, we predict positive New Physics (NP) contributions to ǫK which could be welcomed in view of the recently lowered Standard Model value for ǫK . Interestingly, an explanation for the non-standard values for S φ(η ′ )K S can also naturally lead to an explanation for the anomaly of the muon anomalous magnetic moment. Finally, we outline the role and the interplay of the direct NP searches at the LHC with the indirect searches performed by low energy flavor physics observables.

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The standard model prediction of the muon anomalous magnetic moment

Cited by 163 publications

References 199 publications

Effect of steriles states on lepton magnetic moments and neutrinoless double beta decay

Effect of steriles states on lepton magnetic moments and neutrinoless double beta decay

Tau Physics 2006: Summary & Outlook

Low energy probes of CP violation in a flavor blind MSSM

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