Flavor-changing effective neutral-current couplings in the Weinberg-Salam model

Ma, Ernest; Pramudita, Aloysius Adya

doi:10.1103/physrevd.22.214

Cited by 64 publications

(40 citation statements)

References 15 publications

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“…In our analysis we compute the contribution of the sterile states to all these observables [24,29,[79][80][81][82][83][84], imposing compatibility with the bounds summarised in table 1, also considering the impact of the future experimental sensitivities.…”

Section: Jhep02(2016)083mentioning

confidence: 99%

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Impact of sterile neutrinos on nuclear-assisted cLFV processes

Abada

Romeri

Teixeira

2016

J. High Energ. Phys.

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We discuss charged lepton flavour violating processes occurring in the presence of muonic atoms, such as muon-electron conversion in nuclei CR(µ − e, N), the (Coulomb enhanced) decay of muonic atoms into a pair of electrons BR(µ − e − → e − e − , N), as well as Muonium conversion and decay, Mu − Mu and Mu → e + e − . Any experimental signal of these observables calls for scenarios of physics beyond the Standard Model. In this work, we consider minimal extensions of the Standard Model via the addition of sterile fermions, providing the corresponding complete analytical expressions for all the considered observables. We first consider an "ad hoc" extension with a single sterile fermion state, and investigate its impact on the above observables. Two well motivated mechanisms of neutrino mass generation are then considered: the Inverse Seesaw embedded into the Standard Model, and the νMSM. Our study reveals that, depending on their mass range and on the active-sterile mixing angles, sterile neutrinos can give significant contributions to the above mentioned observables, some of them even lying within present and future sensitivity of dedicated cLFV experiments. We complete the analysis by confronting our results to other (direct and indirect) searches for sterile fermions.

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Section: Jhep02(2016)083mentioning

confidence: 99%

“…The form factors corresponding to the dipole, penguin (photon and Z) and box diagrams of figure 1 presented in section 3 are given by [24,29,79,83]: …”

Section: A1 Muon-electron Conversionmentioning

confidence: 99%

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Impact of sterile neutrinos on nuclear-assisted cLFV processes

Abada

Romeri

Teixeira

2016

J. High Energ. Phys.

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“…Likewise, negative results from laboratory searches for monochromatic lines in the spectrum of muons from π ± → μ ± ν decays are also taken into account [72,73]. As mentioned in the Introduction, the new states (through the modified currents) induce potentially large contributions to cLFV observables; we evaluate the latter [30][31][32][33][34][35][36]38,41] imposing available limits on a wide variety of observables (some of them collected in Table 1). In addition to the cLFV decays and transitions, which can prove instrumental to test and disentangle these extensions of the SM, important constraints arise from rare leptonic and semileptonic decays of pseudoscalar mesons decays (including lepton universality violating, cLFV and lepton number violating modes); we include constraints from numerous K , D, D s , B modes (see [74,75] for kaon decays, [76,77] for D and D S decay rates, and [78,79] for B-meson observations), stressing that in the framework of the SM extended by sterile neutrinos particularly severe constraints arise from the violation of lepton universality in leptonic kaon decays (parametrized by the observable r K ) [67,80].…”

Section: Minimal Sm Extensions Via Sterile Fermionsmentioning

confidence: 99%

“…Minimal extensions of the SM via additional sterile fermion states are an appealing class of models, in particular those that succeed in explaining oscillation data by the introduction of (not excessively) heavy states. Numerous studies have examined the impact of these models regarding several cLFV observables [30][31][32][33][34][35][36][37][38][39][40][41][42], focusing either on specific realisations, or then evaluating the potential contributions of sterile fermions via model-independent, simple constructions (the so-called "3+N" models). Among the many theoretically complete frameworks which simultaneously explain neutrino data, while at the same time having a significant phenomenological impact, one finds several lowscale seesaw models, such as variants of a type I seesaw, the linear seesaw [43,44], the Inverse Seesaw (ISS) Seesaw [45] or the Neutrino Minimal SM (νMSM) [46].…”

Section: Introductionmentioning

confidence: 99%

In-flight cLFV conversion: $${e-\mu }$$ e - μ , $${e-\tau }$$ e - τ and $${\mu -\tau }$$ μ - τ in minimal extensions of the standard model with sterile fermions

et al. 2017

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We revisit charged lepton flavour in-flight conversions, in which a beam of electrons or muons is directed onto a fixed target, e + N → μ + N , e + N → τ + N and μ + N → τ + N , focusing on elastic interactions with a nucleus N . After a general discussion of this observable, we carry a full phenomenological analysis in the framework of minimal Standard Model extensions via sterile neutrinos, with a strong emphasis on the rôle of the increasingly more stringent constraints arising from other (low-energy) charged lepton flavour-violation observables. Despite the potential interest of this observable, in particular in the light of certain upcoming facilities with the capability of very intense lepton beams, our study suggests that due to current bounds on three-body decays ( i → 3 j ) and μ − e conversion in nuclei, the expected number of conversions in such a minimal framework is dramatically reduced. An experimental observation of such a conversion would thus signal the presence of another source of flavour violation, possibly at tree level.

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Effective Flavor‐changing Weak Neutral Current in the Standard Theory and Z‐Boson Decay

Mann¹,

Riemann

1983

Annalen der Physik

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We have studied the effective Zfi f,-vertex in the Glashow-Salam-Weinberg theory arising from 1-loop corrections, allowing for arbitrary fermion masses mi in the loop. We use our results to study the branching ratio of the 2-boson decay into two different fermions. This is of phenomenological interest if there exist yet unknown fermions with large mass which could show up at present and designed accelerators only through radiative corrections. Effektiver flavor-andernder schwacher neutraler Strom in der Standard-Theorio und Z-Boson-Zerfall -Inhaltsubersicht. Wir untersuchen den durch 1-loop-Korrekturen entstehenden Zf,f.-Vertex in der Glashow-Salam-Weinberg-Theorie. Im Loop sind beliebige Fermionmassen zugelassen. Die Resultate werden benutzt, um das Verzweigungsverhiiltnis fiir den 2-Boson-Zerfall in zwei unterschiedliche Fermionen zu untersuchen. Diese Zerfallsmode ist von phanomenologischem Interesse bei dcr Suche nach unbekannten Fermionen sehr grol3er Masse, die an derzeitigen und geplanten Beschleunigern nur durch Strahlungskorrekturen nachweisbar sein werden.

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Flavor-changing effective neutral-current couplings in the Weinberg-Salam model

Abstract: We compute exactly the effective ZdF coupling in the Weinberg-Salam model in the limit of vanishing external momenta. The result is of importance if the effect of the t quark, which has presumably a rather large mass, is to be taken into account.

Cited by 64 publications

References 15 publications

Impact of sterile neutrinos on nuclear-assisted cLFV processes

Impact of sterile neutrinos on nuclear-assisted cLFV processes

In-flight cLFV conversion: $${e-\mu }$$ e - μ , $${e-\tau }$$ e - τ and $${\mu -\tau }$$ μ - τ in minimal extensions of the standard model with sterile fermions

Effective Flavor‐changing Weak Neutral Current in the Standard Theory and Z‐Boson Decay

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