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  1. We present a first search for dark-trident scattering in a neutrino beam using a dataset corresponding to7.2×1020protons on target taken with the MicroBooNE detector at Fermilab. Proton interactions in the neutrino target at the main injector produceπ0andηmesons, which could decay into dark-matter (DM) particles mediated via a dark photonA. A convolutional neural network is trained to identify interactions of the DM particles in the liquid-argon time projection chamber (LArTPC) exploiting its imagelike reconstruction capability. In the absence of a DM signal, we provide limits at the 90% confidence level on the squared kinematic mixing parameterϵ2as a function of the dark-photon mass in the range10MA400MeV. The limits cover previously unconstrained parameter space for the production of fermion or scalar DM particlesχfor two benchmark models with mass ratiosMχ/MA=0.6and 2 and for dark fine-structure constants0.1αD1.

    Published by the American Physical Society2024 
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    Free, publicly-accessible full text available June 1, 2025
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  5. Abstract

    Gravitational lensing by massive objects along the line of sight to the source causes distortions to gravitational wave (GW) signals; such distortions may reveal information about fundamental physics, cosmology, and astrophysics. In this work, we have extended the search for lensing signatures to all binary black hole events from the third observing run of the LIGO-Virgo network. We search for repeated signals from strong lensing by (1) performing targeted searches for subthreshold signals, (2) calculating the degree of overlap among the intrinsic parameters and sky location of pairs of signals, (3) comparing the similarities of the spectrograms among pairs of signals, and (4) performing dual-signal Bayesian analysis that takes into account selection effects and astrophysical knowledge. We also search for distortions to the gravitational waveform caused by (1) frequency-independent phase shifts in strongly lensed images, and (2) frequency-dependent modulation of the amplitude and phase due to point masses. None of these searches yields significant evidence for lensing. Finally, we use the nondetection of GW lensing to constrain the lensing rate based on the latest merger-rate estimates and the fraction of dark matter composed of compact objects.

     
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    Free, publicly-accessible full text available July 31, 2025