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Free, publicly-accessible full text available December 27, 2025
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The proposed approach, BJORK, provides a robust and generalizable workflow to jointly optimize non-Cartesian sampling patters and a physics-informed reconstruction. Several approaches, including re-parameterization of trajectories, multi-level optimization, and non-Cartesian unrolled neural networks, are introduced to improve training effect and avoid sub-optimal local minima. The invivo experiments show that the networks and trajectories learned on simulation dataset are transferable to the real acquisition even with different parameter-weighted MRI contrasts and noise-levels, and demonstrate improved image quality compared with previous learning-based and model-based trajectory optimization methods.more » « less
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Optical pulling force (OPF) can make a nanoparticle (NP) move against the propagation direction of the incident light. Long-distance optical pulling is highly desired for nano-object manipulation, but its realization remains challenging. We propose an NP-in-cavity structure that can be pulled by a single plane wave to travel long distances when the spherical cavity wrapping the NP has a refractive index lower than the medium. An electromagnetic multipole analysis shows that NPs made of many common materials can receive the OPF inside a lower index cavity. Using a silica-Au core-shell NP that is encapsulated by a plasmonic nanobubble, we experimentally demonstrate that a single laser can pull the Au NP-in-nanobubble structure for ~0.1 mm. These results may lead to practical applications that can use the optical pulling of NP, such as optically driven nanostructure assembly and nanoswimmers.more » « less
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We report the results of the first search for Standard Model and baryon-number-violating two-body decays of the neutral mesons to and using of data collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. We observe no evidence of signal from any such decays and set 95% confidence-level upper limits on the products of and branching fractions for these two-body decays with in the range between and . Published by the American Physical Society2024more » « lessFree, publicly-accessible full text available August 1, 2025
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We measure the branching fraction of the decay using data collected with the Belle II detector at the SuperKEKB collider. The data contain meson pairs produced in energy-asymmetric collisions at the resonance. The measured branching fraction , where the first uncertainty is statistical and the second is systematic, is more precise than previous results and constitutes the first observation of the decay with a significance of 6.5 standard deviations. Published by the American Physical Society2025more » « lessFree, publicly-accessible full text available February 1, 2026
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We present a comprehensive study of decays using pairs collected with the Belle detector at the KEKB collider. This process is a suppressed charmless decay into two vector mesons and can exhibit interesting polarization and violation. The decay is observed for the first time with a significance of 7.9 standard deviations. We measure a branching fraction , a fraction of longitudinal polarization , and a time-integrated asymmetry , where the first uncertainties listed are statistical and the second are systematic. This is the first observation of and the first measurements of and for this decay. Published by the American Physical Society2024more » « lessFree, publicly-accessible full text available August 1, 2025
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We report a search for a heavy neutral lepton (HNL) that mixes predominantly with . The search utilizes data collected with the Belle detector at the KEKB asymmetric energy collider. The data sample was collected at and just below the center-of-mass energies of the and resonances and has an integrated luminosity of , corresponding to events. We search for production of the HNL (denoted ) in the decay followed by its decay via . The search focuses on the parameter-space region in which the HNL is long-lived, so that the originate from a common vertex that is significantly displaced from the collision point of the KEKB beams. Consistent with the expected background yield, one event is observed in the data sample after application of all the event-selection criteria. We report limits on the mixing parameter of the HNL with the neutrino as a function of the HNL mass. Published by the American Physical Society2024more » « less