Beyond the Plate: New Geometries Illuminate Short-Range Forces

A new analysis reveals that carefully designed experimental setups can dramatically enhance our ability to detect subtle forces at the nanoscale, opening a path to explore physics beyond the Standard Model.
![Data from the combined Belle and Belle II experiments reveal invariant mass distributions for decaying particles - specifically, [latex]\Xi_{c}^{0}\to\Lambda\eta[/latex], [latex]\Lambda\eta^{\prime}[/latex], and [latex]\Lambda\pi^{0}[/latex] - where a total fit, denoted by solid blue curves, distinguishes signal from background contributions represented by red dashed lines, illuminating the complex pathways of particle decay.](https://arxiv.org/html/2603.21722v1/x2.png)
![The simulations demonstrate that modulating both permittivity [latex]\varepsilon[/latex] and permeability μ-specifically with [latex]\mu_1 = 1.1[/latex], [latex]\mu_2 = 1[/latex], and varying [latex]\varepsilon_1[/latex] from 2.3 to 3 with [latex]\varepsilon_2 = 2[/latex]-allows for controlled spatiotemporal evolution of the electric field, enabling pulse storage and retrieval, and that the efficiency of this process is directly related to the number of modulation cycles applied to the plasma frequency.](https://arxiv.org/html/2603.21622v1/x12.png)
![The analysis demonstrates a strong recovery of injected signals - achieving [latex]\ln\mathrm{BF}=42.24[/latex] when comparing models with and without an InPT component - as evidenced by substantial agreement between Nested Sampling (NS) and Fisher Information Matrix (FIM) results, despite minor discrepancies attributable to non-Gaussian posteriors and statistical fluctuations, and with signal-to-noise ratios of [latex]\mathrm{SNR}\_{a}=118[/latex] and [latex]\mathrm{SNR}\_{r}=66[/latex].](https://arxiv.org/html/2603.21762v1/figures/inpt_getdist.png)

![The observed anti-phase oscillation between the [latex] -7.7 \, H_1 [/latex] (orange) and [latex] H_2 [/latex] (blue) channels confirms mode locking, as predicted by equation (64), demonstrating a synchronized waveform behavior within the WH branch.](https://arxiv.org/html/2603.20594v1/x7.png)