Muon anomalous magnetic moment and positron excess at AMS-02 in a gauged horizontal symmetric model

Tomar, Gaurav; Mohanty, Sanghamitra

doi:10.1007/jhep11(2014)133

Cited by 4 publications

(3 citation statements)

References 79 publications

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“…They can thus lead to relevant quantum corrections to leptonic precision observables and generate lepton flavour violating decays of leptons that are extremely suppressed in the SM since they vanish in the limit of massless neutrinos. The (g − 2) µ discrepancy [17,18], recently reinforced by the g − 2 experiment at Fermilab [19][20][21][22], with a tension of 4.2 σ compared to the SM prediction [23], can be explained with a Z boson heavier than the electroweak (EW) scale if it couples flavour violatingly to the second and third lepton generation [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Jhep06(2021)068mentioning

confidence: 99%

Global analysis of leptophilic Z′ bosons

Buras

Crivellin

Kirk

et al. 2021

J. High Energ. Phys.

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New neutral heavy gauge bosons (Z′) are predicted within many extensions of the Standard Model. While in case they couple to quarks the LHC bounds are very stringent, leptophilic Z′ bosons (even with sizable couplings) can be much lighter and therefore lead to interesting quantum effects in precision observables (like (g − 2)μ) and generate flavour violating decays of charged leptons. In particular, $$ \mathrm{\ell}\to \mathrm{\ell}^{\prime }v\overline{v} $$ ℓ → ℓ ′ v v ¯ decays, anomalous magnetic moments of charged leptons, ℓ → ℓ′γ and ℓ → 3ℓ′ decays place stringent limits on leptophilic Z′ bosons. Furthermore, in case of mixing Z′ with the SM Z, Z pole observables are affected. In light of these many observables we perform a global fit to leptophilic Z′ models with the main goal of finding the bounds for the Z′ couplings to leptons. To this end we consider a number of scenarios for these couplings. While in generic scenarios correlations are weak, this changes once additional constraints on the couplings are imposed. In particular, if one considers an Lμ− Lτ symmetry broken only by left-handed rotations, or considers the case of τ − μ couplings only. In the latter setup, on can explain the (g − 2)μ anomaly and the hint for lepton flavour universality violation in $$ \tau \to \mu v\overline{v}/\tau \to ev\overline{v} $$ τ → μv v ¯ / τ → ev v ¯ without violating bounds from electroweak precision observables.

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Section: Jhep06(2021)068mentioning

confidence: 99%

Global analysis of leptophilic Z′ bosons

Buras

Crivellin

Kirk

et al. 2021

J. High Energ. Phys.

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show abstract

“…We have shown that the same masses and coupling can be used to obtain both the relic abundance of DM and required ∆a µ = 2.8 × 10 −9 within 1σ of the experimental value [3,4]. Another model which can explain AMS-02 and muon (g − 2) has been constructed using a gauged horizontal symmetry [31].…”

Section: Jhep03(2016)062mentioning

confidence: 92%

Explaining AMS-02 positron excess and muon anomalous magnetic moment in dark left-right gauge model

Basak

Mohanty

Tomar

2016

J. High Energ. Phys.

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In a Dark left-right gauge model, the neutral component of right-handed lepton doublet is odd under generalized R-parity and thus the lightest one serves as the dark matter (DM) candidate. The coannihilation of the dark matter with the singly charged Higgs triplet produces the correct relic abundance. We explain AMS-02 positron excess by the annihilation of 800 GeV dark matter into µ + µ − γ, through a t-channel exchange of the additional charged triplet Higgs boson. The DM is leptophilic which is useful for explaining the non-observation of any antiproton excess which would generically be expected from DM annihilation. The large cross-section needed to explain AMS-02 also requires an astrophysical boost. In addition, we show that the muon (g − 2) receives required contribution from singly and doubly charged triplet Higgs in the loops.

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“…They can thus lead to relevant quantum corrections to leptonic precision observables and generate lepton flavour violating decays of leptons that are extremely suppressed in the SM since they vanish in the limit of massless neutrinos. The (g − 2) µ discrepancy [16,17], recently reinforced by the g − 2 experiment at Fermilab [18][19][20][21], with a tension of 4.2 σ compared to the SM prediction [22], can be explained with a Z boson heavier than the electroweak (EW) scale if it couples flavour violatingly to the second and third lepton generation [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Global Analysis of Leptophilic Z' Bosons

Buras,

Crivellin,

Kirk

et al. 2021

Preprint

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New neutral heavy gauge bosons (Z ) are predicted within many extensions of the Standard Model. While in case they couple to quarks the LHC bounds are very stringent, leptophilic Z bosons (even with sizable couplings) can be much lighter and therefore lead to interesting quantum effects in precision observables (like (g − 2) µ ) and generate flavour violating decays of charged leptons. In particular, → ν ν decays, anomalous magnetic moments of charged leptons, → γ and → 3 decays place stringent limits on leptophilic Z bosons. Furthermore, in case of mixing Z with the SM Z, Z pole observables are affected. In light of these many observables we perform a global fit to leptophilic Z models with the main goal of finding the bounds for the Z couplings to leptons. To this end we consider a number of scenarios for these couplings. While in generic scenarios correlations are weak, this changes once additional constraints on the couplings are imposed. In particular, if one considers an L µ − L τ symmetry broken only by left-handed rotations, or considers the case of τ − µ couplings only. In the latter setup, on can explain the (g − 2) µ anomaly and the hint for lepton flavour universality violation in τ → µν ν/τ → eν ν without violating bounds from electroweak precision observables.

show abstract

Muon anomalous magnetic moment and positron excess at AMS-02 in a gauged horizontal symmetric model

Cited by 4 publications

References 79 publications

Global analysis of leptophilic Z′ bosons

Global analysis of leptophilic Z′ bosons

Explaining AMS-02 positron excess and muon anomalous magnetic moment in dark left-right gauge model

Global Analysis of Leptophilic Z' Bosons

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