Observable flavor violation from spontaneous lepton number breaking

Escribano, Pablo; Hirsch, Martin; Nava, Jacopo; Vicente, Avelino

doi:10.1007/jhep01(2022)098

Cited by 10 publications

(5 citation statements)

References 35 publications

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“…While in some scenarios the majoron couplings to charged leptons appear at tree-level [18,19], in many cases the leading order contribution is induced at the 1-loop level. For instance, this is the case of the popular type-I seesaw with spontaneous lepton number violation [9,20,21].…”

Section: Majoron Coupling To Charged Leptonsmentioning

confidence: 99%

Ultraviolet extensions of the Scotogenic model

Portillo-Sánchez¹,

Escribano²,

Vicente³

2023

Preprint

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The Scotogenic model is a popular scenario that induces radiative Majorana neutrino masses and includes a weakly-interacting dark matter candidate. We classify all possible ultraviolet extensions of the Scotogenic model in which (i) the dark Z 2 parity emerges at low energies after the spontaneous breaking of a global U(1) L lepton number symmetry, and (ii) the low-energy effective theory contains a naturally small lepton number breaking parameter, suppressed by the mass of a heavy mediator integrated out at tree-level. We find 24 such models and discuss two of them in detail to illustrate our setup. We also discuss some general aspects of the phenomenology of the models in our classification, exploring possible lepton flavor violating signals, collider signatures and implications for dark matter. The phenomenological prospects of these scenarios are very rich due to the presence of additional scalar states, including a massless Goldstone boson.

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Section: Majoron Coupling To Charged Leptonsmentioning

confidence: 99%

Ultraviolet extensions of the Scotogenic model

Portillo-Sánchez¹,

Escribano²,

Vicente³

2023

Preprint

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“…Thereafter, new models have been developed by taking spontaneous breaking of R-parity into consideration, where there is no significant invisible Z-width [14] and the decay of charged leptons with Majoron emission is permitted. Theoretical calculation implies that the branching fraction of is potentially able to be measured in current experiments [15,16]. The phenomenology of Majoron was discussed in many recent papers and so were, in particular, its leptonflavor-violating (LFV) interactions, which provides strong support in theory to the search for Majoron [17][18][19].…”

Section: Introductionmentioning

confidence: 98%

Search for Majoron at the COMET experiment*

Xing

Wu²,

Miao³

et al. 2023

Chinese Phys. C

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A new Goldstone particle named Majoron is introduced in order to explain the origin of neutrino mass by some new physics models assuming that neutrinos are Majorana particle. By expanding signal region and using likelihood analysis, it becomes possible to search for Majoron at experiments that is originally designed to search for μ-e conversion. For the COMET experiment, the sensitivity of process μ→eJ is able to reach Β μ→eJ=2.3∗10-5 in Phase-I and O(10-8) in Phase-II. Meanwhile, the sensitivities to search for Majoron at future experiments are also discussed in this article. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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“…This process has received considerable interest from the theory community [31][32][33][34][35]. In [36] an analysis has been presented where available and potentially new µ + → e + X searches are compared to other limits for ALPs coupling to leptons.…”

Section: Introductionmentioning

confidence: 99%

High-precision muon decay predictions for ALP searches

et al. 2023

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We present an improved theoretical prediction of the positron energy spectrum for the polarised Michel decay \mu^+\to e^+ \nu_e\bar{\nu}_\muμ+→e+νeν‾μ. In addition to the full next-to-next-to-leading order correction of order \alpha^2α2 in the electromagnetic coupling, we include logarithmically enhanced terms at even higher orders. Logarithms due to collinear emission are included at next-to-leading accuracy up to order \alpha^4α4. At the endpoint of the Michel spectrum, soft photon emission results in large logarithms that are resummed up to next-to-next-to-leading logarithmic accuracy. We apply our results in the context of the MEG II and Mu3e experiments to estimate the impact of the theory error on the branching ratio sensitivity for the lepton-flavour-violating decay \mu^+\to e^+ Xμ+→e+X of a muon into an axion-like particle XX.

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Observable flavor violation from spontaneous lepton number breaking

Cited by 10 publications

References 35 publications

Ultraviolet extensions of the Scotogenic model

Ultraviolet extensions of the Scotogenic model

Search for Majoron at the COMET experiment*

High-precision muon decay predictions for ALP searches

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