Ultralight scalar dark matter amplifies the lepton-flavor-violating muon-to-positron conversion rate via an effective Majorana mass m_μe, yielding new constraints on flavor-off-diagonal neutrino couplings from SINDRUM II, COMET, and Mu2e bounds.
Search for the Lepton Flavour Violating Decay $\mu^{+} \to e^+ \gamma$ with the Full Dataset of the MEG Experiment
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abstract
The final results of the search for the lepton flavour violating decay $\mu^{+} \rightarrow {\rm e^{+}} \gamma$ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009--2013 and totalling $7.5\times 10^{14}$ stopped muons on target are presented. No significant excess of events is observed in the dataset with respect to the expected background and a new upper limit on the branching ratio of this decay of $BR( \mu^{+} \rightarrow {\rm e^{+}} \gamma ) < 4.2 \times 10^{-13}$ (90\%\ confidence level) is established, which represents the most stringent limit on the existence of this decay to date.
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Derives new physics scale constraints in a six-dimensional EFT subspace for μ to e transitions using data from μ→eγ, μ→3e, and nuclear conversion experiments while highlighting their complementarity.
High-scale leptogenesis in the scotogenic model decouples from LFV bounds and remains viable, while low-scale resonant leptogenesis is viable only in a narrow parameter region with suppressed flavor violation.
In a 3-4-1 model with minimal inverse seesaw, strong correlations are predicted between (g-2) anomalies and LFV decay rates, with the tau to muon gamma decay bound limiting the muon anomaly deviation to 10^{-9}.
Numerical scans in the minimal scotogenic model indicate that approximate neutrino texture structures emerge dynamically from dark matter and lepton flavor violation consistency conditions.
In a two-triplet Type-II seesaw, resonant leptogenesis at the TeV scale dynamically requires small Yukawa couplings that suppress observable lepton flavor violation as a direct consequence of successful baryogenesis.
In the 331ALP model the second Higgs is predicted above 600 GeV and the Z' above 5.1 TeV, with dark matter mass related to the axion breaking scale under a residual Z2 symmetry.
The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-charged fermion constraints.
A review summarizing recent progress in high-intensity polarized muon beams for precision muonium physics, new physics searches, and materials science applications.
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Muon beams towards muonium physics: progress and prospects
A review summarizing recent progress in high-intensity polarized muon beams for precision muonium physics, new physics searches, and materials science applications.