scholarly journals Discriminating Chiral Insertions from BSM for the Muon (g-2) by non-Abelian Zero Modes

2021 ◽  
Author(s):  
Hani W. Maalouf
Keyword(s):  
Magnetic Moment ◽  
Landau Gauge ◽  
New Physics ◽  
Double Pole ◽  
Lepton Flavor ◽  
Zero Modes ◽  
Vector Mode ◽  
The One ◽  
Muon Magnetic Moment ◽  
Normalization Factors

Abstract A sorting out method, between the New Physics and as vs. the Lepton Flavor Violated Chiral insertion is exposed, interpreting so the Light-by-Light scattered amplitude deviation in the muon magnetic moment, with a novel 2-color instead of 3-color in diagrams projective polarizations. The calculation is done using an extension-detention of the muon resonance interaction internal lines (which may be generically of a non-QCD nature)such its modes’ phonons decompose into instantons while the helicities are to meet the imposed polarizations. A confirmation comes out from a non-applicability of the Landau Gauge, to the one of the cases, the tri-vector-mode, giving it a double pole in its Goldstone propagator, vs. its truth in the Sudakov type with a single pole mode Goldstone propagator.The fits between expansions of the phonon derived from slicing’s, and the instanton derived from inverse arguments of differently coupled cosine’s, are surprisingly proportional to their projected (2 to 3 in their extended diagrams) normalization factors paving ways into a BSM popped up selectivity method.

scholarly journals Charged lepton flavor violation in light of the muon magnetic moment anomaly and colliders

2021 ◽  
Vol 81 (9) ◽  
Author(s):  
Tong Li ◽  
Michael A. Schmidt ◽  
Chang-Yuan Yao ◽  
Man Yuan
Keyword(s):  
Magnetic Moment ◽  
Charged Lepton ◽  
New Physics ◽  
Lepton Flavor Violation ◽  
Lepton Sector ◽  
Gauge Invariant ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Muon Magnetic Moment ◽  
Charged Lepton Sector

AbstractAny observation of charged lepton flavor violation (CLFV) implies the existence of new physics beyond the SM in charged lepton sector. CLFV interactions may also contribute to the muon magnetic moment and explain the discrepancy between the SM prediction and the recent muon $$g-2$$ g - 2 precision measurement at Fermilab. We consider the most general SM gauge invariant Lagrangian of $$\Delta L=0$$ Δ L = 0 bileptons with CLFV couplings and investigate the interplay of low-energy precision experiments and colliders in light of the muon magnetic moment anomaly. We go beyond previous work by demonstrating the sensitivity of the LHC, the MACE experiment, a proposed muonium-antimuonium conversion experiment, and a muon collider. Currently-available LHC data is already able to probe unexplored parameter space via the CLFV process $$pp\rightarrow \gamma ^*/Z^*\rightarrow \ell _1^\pm \ell _1^\pm \ell _2^\mp \ell _2^\mp $$ p p → γ ∗ / Z ∗ → ℓ 1 ± ℓ 1 ± ℓ 2 ∓ ℓ 2 ∓ .

The muon magnetic moment and new physics

2013 ◽  
Vol 214 (1-3) ◽  
pp. 13-19 ◽  
Author(s):  
Dominik Stöckinger
Keyword(s):  
Magnetic Moment ◽  
New Physics ◽  
Muon Magnetic Moment

scholarly journals LEPTON FLAVOR VIOLATING DECAY $Z\to\ell^\pm_i\ell^\mp_j$ IN THE 331 MODEL

2011 ◽  
Vol 26 (24) ◽  
pp. 4171-4185 ◽  
Author(s):  
I. CORTÉS-MALDONADO ◽  
A. MOYOTL ◽  
G. TAVARES-VELASCO
Keyword(s):  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Lepton Flavor ◽  
Loop Level ◽  
Current Limit ◽  
Z Decays ◽  
The One ◽  
Doubly Charged

We study the lepton flavor violating (LFV) decays [Formula: see text](ℓi,j = e,μ,τ) in the framework of the minimal 331 model. The main contributions arise at the one-loop level via a doubly charged bilepton with general LFV couplings. We obtain an estimate for the corresponding branching ratios by using the bounds on the LFV couplings of the doubly charged bilepton from the current experimental limits on the decays ℓi → ℓjγ and [Formula: see text]. A bound on the bilepton mass is also obtained through the current limit on the anomalous magnetic moment of the muon. It is found that the bilepton contributions to LFV Z decays are not expected to be at the reach of experimental detection. In particular, the branching ratio for the Z → μ±τ∓ decay is below the 10-10 level for a bilepton mass of the order of 500 GeV.

scholarly journals Scalar leptoquarks in leptonic processes

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Andreas Crivellin ◽  
Christoph Greub ◽  
Dario Müller ◽  
Francesco Saturnino
Keyword(s):  
Standard Model ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Lepton Flavor ◽  
Interaction Terms ◽  
The Standard Model ◽  
The One ◽  
Scalar Leptoquarks

Abstract Leptoquarks are hypothetical new particles, which couple quarks directly to leptons. They experienced a renaissance in recent years as they are prime candidates to explain the so-called flavor anomalies, i.e. the deviations between the Standard Model predictions and measurements in b → sℓ+ℓ− and b → cτν processes and in the anomalous magnetic moment of the muon. At the one-loop level these particles unavoidably generate effects in the purely leptonic processes like Z → ℓ+ℓ−, Z →$$ v\overline{v} $$ v v ¯ , W → ℓν and h → ℓ+ℓ− and can even generate non-zero rates for lepton flavor violating processes such as ℓ → ℓ′γ, Z → ℓ+ℓ′−, h → ℓ+ℓ′− and ℓ → 3ℓ′. In this article we calculate these processes for all five representations of scalar Leptoquarks. We include their most general interaction terms with the Standard Model Higgs boson, which leads to Leptoquark mixing after the former acquires a vacuum expectation value. In our phenomenological analysis we investigate the effects in modified lepton couplings to electroweak gauge bosons, we study the correlations of the anomalous magnetic moment of the muon with h → μ+μ− and Z → μ+μ− as well as the interplay between different lepton flavor violating decays.

scholarly journals Interplay of New Physics effects in (g − 2)ℓ and h → ℓ+ℓ− — lessons from SMEFT

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Svjetlana Fajfer ◽  
Jernej F. Kamenik ◽  
M. Tammaro
Keyword(s):  
Closed Operator ◽  
Higgs Doublet ◽  
New Physics ◽  
Effective Field ◽  
Tree Level ◽  
Electroweak Symmetry ◽  
Scalar Leptoquark ◽  
Doublet Model ◽  
The One ◽  
Two Higgs Doublet Model

Abstract We explore the interplay of New Physics (NP) effects in (g− 2)ℓ and h→ℓ+ℓ− within the Standard Model Effective Field Theory (SMEFT) framework, including one-loop Renormalization Group (RG) evolution of the Wilson coefficients as well as matching to the observables below the electroweak symmetry breaking scale. We include both the leading dimension six chirality flipping operators including a Higgs and SU(2)L gauge bosons as well as four-fermion scalar and tensor operators, forming a closed operator set under the SMEFT RG equations. We compare present and future experimental sensitivity to different representative benchmark scenarios. We also consider two simple UV completions, a Two Higgs Doublet Model and a single scalar LeptoQuark extension of the SM, and show how tree level matching to SMEFT followed by the one-loop RG evolution down to the electroweak scale can reproduce with high accuracy the (g−2)ℓ and h→ℓ+ℓ− contributions obtained by the complete one- and even two-loop calculations in the full models.

Precise Determination of the Muon Magnetic Moment

1959 ◽  
Vol 2 (12) ◽  
pp. 516-517 ◽  
Author(s):  
R. L. Garwin ◽  
D. P. Hutchinson ◽  
S. Penman ◽  
G. Shapiro
Keyword(s):  
Magnetic Moment ◽  
Precise Determination ◽  
Muon Magnetic Moment

The Positive Muon Magnetic Moment

1970 ◽  
pp. 636-639
Author(s):  
D. Hutchinson ◽  
A. Kanofsky ◽  
F. Larsen ◽  
N. Schoen ◽  
D. Sober
Keyword(s):  
Magnetic Moment ◽  
Positive Muon ◽  
Muon Magnetic Moment
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