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

Cheung, Kingman; Soffer, Abner; Wang, Zeren Simon; Wu, Yu-Heng

doi:10.48550/arxiv.2108.11094

Cited by 4 publications

(6 citation statements)

References 95 publications

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“…There are two possible discriminators to tell the present MFV ALP from theirs. One is λ γ , because the flavor couplings in their setup are totally independent with each other, not constrained by MFV, so the parity violation is parametric, therefore no definite value of λ γ has been predicted in [80]. In contrast, the present MFV ALP is definitely right-handed specific for muon and electron, where the parity is broken only by the right-handed rotation in the framework of MFV, as emphasized in the previous section.…”

Section: Discrimination From Other Lfv Np Candidates In Light Of Bell...mentioning

confidence: 77%

“…• Second, in a recent paper [80], the authors focus on a light ALP having a high enough detection sensitivity at Belle II, through LFV and multi-lepton signals. Two parallel benchmark scenarios have been investigated in [80], where c ee and c eτ or c µµ and c µτ are turned on, respectively. There are two possible discriminators to tell the present MFV ALP from theirs.…”

Section: Discrimination From Other Lfv Np Candidates In Light Of Bell...mentioning

confidence: 99%

“…The other discriminator is the tri-lepton signal where tau decays into three charged leptons. Since the ALP in [80] keeps the flavor-diagonal couplings to muon and electron, the tri-lepton process is possible to take place. In contrast, the present ALP is tau-specific, and has no flavor-diagonal coupling to muon and electron, as seen from Eq.…”

Section: Discrimination From Other Lfv Np Candidates In Light Of Bell...mentioning

confidence: 99%

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Probing an intrinsically flavorful ALP via tau-lepton flavor physics

Cui,

Ishida,

Matsuzaki

et al. 2021

Preprint

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We discuss a third-generation specific axionlike particle (ALP) with minimum flavor violation (MFV), focusing on the tau-lepton flavor violation (LFV). The ALP is tau-philic on a currenteigenstate basis, a la Pecci-Quinn, and also couples to muon and electron in a right-handed specific manner as a consequence of the MFV arising from the right-handed flavor rotation within the standard model (SM). Several LFV processes are generated including radiative tau decays and also anomalous magnetic moments of electron and muon. We first pay attention to two separated limits: electron scenario with the ALP coupled to tau which mixes only with right-handed electron, and muon scenario as the muonic counterpart of the electron scenario. It turns out that those scenarios are highly constrained by existing experimental limits from the LFV processes and (g − 2)s, to require emergence of a flavor symmetry for the ALP like U (1)e−τ or U (1)µ−τ . We then explore a hybrid scenario combining the two separated scenarios, and find a fully viable parameter space on the ALP mass-photon coupling plane, which limits the ALP mass to be around (1.7 − 8) GeV and the ALP decay constant fa to be (10 -50) GeV. Discrimination of the present ALP from other light LFV particles are also discussed. We find that the polarization asymmetry in LFV radiative τ decay is a smoking-gun, which definitely predicts preference of the right-handed polarization due to the MFV, in sharp contrast to the SM prediction with the highly left-handed preference, and also other light-new physics candidates with the same mass scale as the present ALP. Possible model-building to underlie the present third-generation specific ALP is also briefly addressed.

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Section: Discrimination From Other Lfv Np Candidates In Light Of Bell...mentioning

confidence: 77%

Section: Discrimination From Other Lfv Np Candidates In Light Of Bell...mentioning

confidence: 99%

Section: Discrimination From Other Lfv Np Candidates In Light Of Bell...mentioning

confidence: 99%

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Probing an intrinsically flavorful ALP via tau-lepton flavor physics

Cui,

Ishida,

Matsuzaki

et al. 2021

Preprint

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“…Recent phenomenology studies on ALPs at e − e + colliders can be found in Refs. [44][45][46][47][48][49], and more studies can be found in the reviews [50][51][52][53][54][55] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Search for long-lived axions with far detectors at future lepton colliders

Tian¹,

Wang²,

Wang³

2022

Preprint

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In our previous work [Phys. Rev. D 101 (2020) 075046], we have proposed to install FAr Detectors at the Electron Positron Collider (FADEPC) to enhance the discovery potential of the long-lived particles (LLPs). In this study, we consider eight designs of far detectors with different locations, volumes and geometries and investigate their potential for discovering long-lived axion-like particles (ALPs) via the process e − e + → γ a, a → γγ at future e − e + colliders running at center-of-mass energy of √ s = 91.2 GeV and integrated luminosities of 16, 150, and 750 ab −1 . We estimate their sensitivities on the model parameters in terms of the effective ALP-photon-photon coupling Cγγ/Λ, the effective ALP-photon-Z coupling CγZ /Λ, and ALP mass ma for three physics scenarios: CγZ = 0; CγZ = Cγγ and both CγZ and Cγγ can freely change.

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“…Signatures of directly detectable or escaping long-lived particles at B factories have also been discussed in Refs. [30,[44][45][46][47][48][49][50][51][52][53][54][55] This paper is organized as follows: section 2 contains the theoretical framework of the RPV scenario. This includes the effective Lagrangian with the RPV terms and the calculation of the matrix elements, which we estimate using an effective BNV Lagrangian.…”

mentioning

confidence: 99%

Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino

Dib¹,

Helo²,

Lyubovitskij³

et al. 2022

Preprint

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We propose a search for B meson decays to a proton or a hyperon plus missing energy at the Belle II experiment to probe supersymmetry with a GeV-scale lightest neutralino χ01 and R-parity violation (RPV). We perform analytic computations of the signal branching fractions in the framework of effective field theory, with a single nonzero RPV operator λ 1j3 Ū c 1 Dc j Dc 3 , where j = 1, 2. The hadronic form factors are calculated using an SU(3) phenomenological Lagrangian approach. Since the decay of the neutralino is kinematically and CKM suppressed in this theoretical scenario, it decays outside the detector and appears experimentally only as missing energy. We detail the analysis techniques at the experimental level and estimate the background in the B + → p χ01 search using published results for B + → K + ν ν. Our final sensitivity plots are shown for both λ 113 versus the squark mass m q and λ 113 /m 2 q versus the neutralino mass m χ0 1 . We find that the search at Belle II could probe λ 113 /m 2 q down to the order of 10 −8 GeV −2 in the kinematically allowed m χ0 1 range. We also obtain current limits on B 0 → Λ 0 χ0 1 by recasting an existing search, and comment about searches for B + → Σ + χ01 and B 0 → Σ 0 χ0 1 . In closing, we briefly discuss potential searches at the LHCb and BESIII experiments.

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

Cited by 4 publications

References 95 publications

Probing an intrinsically flavorful ALP via tau-lepton flavor physics

Probing an intrinsically flavorful ALP via tau-lepton flavor physics

Search for long-lived axions with far detectors at future lepton colliders

Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino

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