paper / metaai / Jun 11
This work addresses the performance degradation in radar-camera Bird's-Eye View (BEV) perception models when cross-dataset evaluation is performed. It introduces a novel framework that models source-domain variations by characterizing visual scene variations in the frequency domain and synthesizing diverse views. This approach captures the influence of image-level variations on multi-modal BEV features, using these patterns to regularize the detector's fusion space for improved stability. The method consistently enhances cross-dataset 3D detection performance without altering the inference pipeline and shows effectiveness even with limited target-domain data.
3d-perceptioncomputer-visionmulti-modal-fusiondomain-variationrobustnessautonomous-driving
“Radar-camera BEV perception models exhibit performance degradation when applied across different datasets due to variations in driving scenes, sensor configurations, and environmental conditions.”
paper / metaai / Jun 11
This study reports an updated, high-precision measurement of the branching fraction for $D_s^+ \to \tau^+ \nu_{\tau}$, utilizing a dataset of 7.33 fb$^{-1}$ collected by the BESIII detector. The measurement yields $\mathcal{B}({D_s^+ \to \tau^+ \nu_{\tau}}) = (5.37 \pm 0.08_{\rm stat} \pm 0.06_{\rm syst})$ %. This enables a precise determination of the product $f_{D_s^+} |V_{cs}|$, and consequently, improved constraints on $|V_{cs}|$ when informed by lattice QCD calculations of $f_{D_s^+}$. The results are consistent with lepton flavor universality.
particle-physicsexperimental-physicsstandard-modelcharm-physicsbesiiibranching-fraction
“The branching fraction of $D_s^+ \to \tau^+ \nu_{\tau}$ has been measured to be $(5.37 \pm 0.08_{\rm stat} \pm 0.06_{\rm syst})$ %”
paper / metaai / Jun 11
BESIII reports the first measurement of the relative strong phase between electromagnetic and strong amplitudes in J/ψ decays to K*K̅, finding a ~150° phase in the neutral channel—4.2σ away from the expected orthogonality of 90° and 10σ from a real amplitude. The charged channel phase (~180°) is consistent with model expectations within 1σ, revealing unexpected model-dependent behavior. Branching fractions are consistent with world averages but improved by at least a factor of two, and isospin symmetry in the strong amplitude ratio holds within 1.8σ after subtracting the EM contribution. No direct CP violation is observed.
particle-physicsj-psi-decayisospin-symmetrycp-violationhadron-spectroscopybesiii
“The relative strong phase φ_γ,3g between electromagnetic and strong amplitudes in J/ψ → K̅⁰K*(892)⁰ (neutral channel) is measured to be approximately 150°, a value that deviates from 90° (orthogonality) by 4.2σ and from 0°/180° (real amplitude) by 10.0σ/1.6σ.”