Purely flavor-changing Z
                            ′ bosons and where they might hide

Foldenauer, Patrick; Jaeckel, Joerg

doi:10.1007/jhep05(2017)010

Cited by 17 publications

(12 citation statements)

References 94 publications

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“…Generally speaking, the phenomenological predictions may be divided into low energy flavour changing and rare processes, and high energy collider signatures. The low energy flavour changing will encompass lepton flavour violation, including τ decays [18], while the LHC predictions include a Z ′ as well as a complete fourth vector-like family, with interesting flavour dependent signatures. The Z ′ may be light and weakly coupled, for example around 100 GeV in the fermiophobic model, or heavier with non-universal couplings to electrons and muons, for example just above the current LHC limit of 3 TeV in the SO(10) model.…”

Section: Discussionmentioning

confidence: 99%

Flavourful $Z'$ models for $R_{K^{(*)}}$

King

2017

Preprint

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We show how any flavour conserving Z ′ model can be made flavour violating and non-universal by introducing mass mixing of quarks and leptons with a fourth family of vector-like fermions with non-universal Z ′ couplings. After developing a general formalism, we focus on two concrete examples, namely a fermiophobic model, and an SO(10) GUT model, and show how they can account for the anomalous B decay ratios R K and R K * . A similar analysis could be performed for B − L models, E 6 models, composite models, and so on.

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Section: Discussionmentioning

confidence: 99%

Flavourful $Z'$ models for $R_{K^{(*)}}$

King

2017

Preprint

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“…A determination of the decoupling of the gauge boson in the early universe would require a more sophisticated analysis. 12 For similar discussions around flavor-changing couplings we refer to [128,129].…”

Section: Discussionmentioning

confidence: 99%

Hunting all the hidden photons

Bauer¹,

Foldenauer²,

Jaeckel³

2018

J. High Energ. Phys.

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375

450

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We explore constraints on gauge bosons of a weakly coupled U(1) B−L , U(1) Lµ−Le , U(1) Le−Lτ and U(1) Lµ−Lτ . To do so we apply the full constraining power of experimental bounds derived for a hidden photon of a secluded U(1) X and translate them to the considered gauge groups. In contrast to the secluded hidden photon that acquires universal couplings to charged Standard Model particles through kinetic mixing with the photon, for these gauge groups the couplings to the different Standard Model particles can vary widely. We take finite, computable loop-induced kinetic mixing effects into account, which provide additional sensitivity in a range of experiments. In addition, we collect and extend limits from neutrino experiments as well as astrophysical and cosmological observations and include new constraints from white dwarf cooling. We discuss the reach of future experiments in searching for these gauge bosons.

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“…We note that our "model-independent" limits on the branching-fraction product be used to obtain constraints on other models with similar scattering and decay topologies. Examples include a light new gauge boson Z [90,112,113] or a light CP -even scalar [114][115][116].…”

Section: Scenario 1: G τ E and G Eementioning

confidence: 99%

Probing charged lepton flavor violation with axion-like particles at Belle II

Cheung

Soffer

Wang

et al. 2021

J. High Energ. Phys.

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We study charged lepton flavor violation associated with a light leptophilic axion-like particle (ALP), X, at the B-factory experiment Belle II. We focus on production of the ALP in the tau decays τ → Xl with l = e, μ, followed by its decay via X → l−l+. The ALP can be either promptly decaying or long-lived. We perform Monte-Carlo simulations, recasting a prompt search at Belle for lepton-flavor-violating τ decays, and propose a displaced-vertex (DV) search. For both types of searches, we derive the Belle II sensitivity reaches in both the product of branching fractions and the ALP coupling constants, as functions of the ALP mass and lifetime. The results show that the DV search exceeds the sensitivity reach of the prompt search to the relevant branching fractions by up to about a factor of 40 in the long decay length regime.

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Purely flavor-changing Z ′ bosons and where they might hide

Cited by 17 publications

References 94 publications

Flavourful $Z'$ models for $R_{K^{(*)}}$

Flavourful $Z'$ models for $R_{K^{(*)}}$

Hunting all the hidden photons

Probing charged lepton flavor violation with axion-like particles at Belle II

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