Model independent constraints on four-lepton operators

Falkowski, Adam; Mimouni, Kin

doi:10.1007/jhep02(2016)086

Cited by 63 publications

(57 citation statements)

References 65 publications

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“…Their interference with the SM is not suppressed in collider observables and an interesting interplay with LEP [114,115] and LHC [47,116,117] searches is expected.…”

Section: Jhep12(2016)052mentioning

confidence: 99%

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

González–Alonso

Camalich

2016

J. High Energ. Phys.

129

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We analyze the decays K → π ν and P → ν (P = K, π, = e, µ) using a low-energy Effective-Field-Theory approach to parametrize New Physics and study the complementarity with baryon β decays. We then provide a road map for a global analysis of the experimental data, with all the Wilson coefficients simultaneously, and perform a fit leading to numerical bounds for them and for V us . A prominent result of our analysis is a reinterpretation of the well-known V ud −V us diagram as a strong constraint on new physics. Finally, we reinterpret our bounds in terms of the SU(2) L × U(1) Y -invariant operators, provide bounds to the corresponding Wilson coefficients at the TeV scale and compare our results with collider searches at the LHC.

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“…Their interference with the SM is not suppressed in collider observables and an interesting interplay with LEP [114,115] and LHC [47,116,117] searches is expected.…”

Section: Jhep12(2016)052mentioning

confidence: 99%

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

González–Alonso

Camalich

2016

J. High Energ. Phys.

129

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“…Whereas, if one was trying to reconstruct the coefficients of the SU(2)-invariant operators from data, some additional input (e.g. from Z physics, neutrino interactions [52], or loop matching) would be required for the vector operators, beyond the coefficients of the operators of Eqs. (1) and (2).…”

Section: Comments On Tree Matchingmentioning

confidence: 99%

$$\mu \rightarrow e \gamma $$ μ → e γ and matching at $$\varvec{m_W}$$ m W

Davidson

2016

Eur. Phys. J. C

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Several experiments search for μ ↔ e flavour change, for instance in μ → e conversion, μ → eγ and μ → eēe. This paper studies how to translate these experimental constraints from low energy to a New Physics scale M m W . A basis of QCD × QED-invariant operators (as appropriate below m W ) is reviewed, then run to m W with one-loop Renormalisation Group Equations (RGEs) of QCD and QED. At m W , these operators are matched onto SU(2)-invariant dimension-six operators, which can continue to run up with electroweak RGEs. As an example, the μ → eγ bound is translated to the scale M, where it constrains two sums of operators. The constraints differ from those obtained in previous EFT analyses of μ → eγ , but they reproduce the expected bounds on flavour-changing interactions of the Z and the Higgs, because the matching at m W is pragmatically performed to the loop order required to get the "leading" contribution.

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“…Another consequences of this same fact is that the limits on the scale m * for chiral-compositeness are much higher, their effects scaling as (E/m * ) 2 . This also means that, for a proper extraction of the bounds, SUSY-breaking effects which generate four-fermion operators should be included in the analysis [58], even if suppressed by (g SM /g * ) 2 .…”

Section: G * /4πmentioning

confidence: 99%

The other effective fermion compositeness

Bellazzini

Riva

Serra

et al. 2017

J. High Energ. Phys.

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Abstract:We discuss the only two viable realizations of fermion compositeness described by a calculable relativistic effective field theory consistent with unitarity, crossing symmetry and analyticity: chiral-compositeness vs goldstino-compositeness. We construct the effective theory of N Goldstini and show how the Standard Model can emerge from this dynamics. We present new bounds on either type of compositeness, for quarks and leptons, using dilepton searches at LEP, dijets at the LHC, as well as low-energy observables and precision measurements. Remarkably, a scale of compositeness for Goldstino-like electrons in the 2 TeV range is compatible with present data, and so are Goldstino-like first generation quarks with a compositeness scale in the 10 TeV range. Moreover, assuming maximal R-symmetry, goldstino-compositeness of both right-and left-handed quarks predicts exotic spin-1/2 colored sextet particles that are potentially within the reach of the LHC.

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Model independent constraints on four-lepton operators

Cited by 63 publications

References 65 publications

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

$$\mu \rightarrow e \gamma $$ μ → e γ and matching at $$\varvec{m_W}$$ m W

The other effective fermion compositeness

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