Coupled-Channel-Induced S−DS-D mixing of Charmonia and Testing Possible Assignments for Y(4260)Y(4260) and Y(4360)Y(4360)

The mass spectrum and the two-body open-charm decays of the $J^{PC}=1^{--}$ charmonium states are studied with the coupled-channel effects taken into account. The coupled-channel-induced mixing effects among the excited vector charmonia are studied. Based on our calculations of the masses and the decay widths, we find that the tension between the observed properties of $Y(4260)/Y(4360)$ and their conventional charmonia interpretations could be softened.Comment: 13 pages, 5 figures, 5 table

Balanced AR Glasses System Between Text and Image Information Helps People Get a better Reading Skill

Nowadays, people prefer browsing images and videos on their phones rather than reading a book (Thain 2018). Even if they decide to read something, they are still heavily distracted by electronic devices. In my thesis, I’m trying to balance the visual and text information and help people to stay more focused while reading. My solution: Focus is an AR glasses system that recognizes the contents users are viewing and records users’ reading and image browsing time. And users have to earn image/video time by reading the text. The glasses block images/videos if they run out of image time

Neutrino and Antineutrino Induced Meson Production

Coherent meson production measurement is very important in physics research. First, the coherent pion production is a potential background to v oscillation in next generation of Long Base Line Experiment(ELBNF/DUNE); second, coherent pion and coherent p production provide a detailed test of CVC and PCAC hypothesis; third, coherent meson production can be used to monitor the neutrino and anti-neutrino fluxes in the experiment. This dissertation focuses on two parts: coherent pi production in NOMAD, and coherent p simulation using LBNF fluxes. With the NOMAD data, the ratio between cross-sections of coherent pi- and v charged current interactions was measured and compared with the measurements of coherent pi+. The experience of coherent pi analysis may be used to evaluate the sensitivity of ELBNF/DUNE project to coherent processes. With the ELBNF process, I wrote a new C++ simulation package and generated 100k coherent p+ events. It is known that for the neutrino-induced process, the incoming neutrino fluxes could not be measured directly, and the Q2 and other variables related to it are unknown in the neutrino-induced neutral current interactions. The photon-induced coherent p0 provides a way to get additional information to constrain the incoming neutrino fluxes. I calculated the ratios between the cross-sections of neutrino-induced coherent p+-, p0 and photon-induced coherent p0. With these ratios, some kinematic variable distributions are reweighted with this ratio in this thesis

Strong decays of D3∗(2760)D_{3}^{*}(2760) D 3 ∗ ( 2760 ) , Ds3∗(2860)D_{s3}^{*}(2860) D s 3 ∗ ( 2860 ) , B3∗B_{3}^{*} B 3 ∗ , and Bs3∗B_{s3}^{*} B s 3 ∗

In this paper, we study the OZI-allowed two-body strong decays of $$3^-$$ heavy–light mesons. Experimentally the charmed $$D_{3}^{*}(2760)$$ and the charm–strange $$D_{s3}^{*}(2860)$$ states with these quantum numbers have been discovered. For the bottomed B(5970) state, which was found by the CDF Collaboration recently, its quantum number has not been decided yet and we assume it is a $$3^-$$ meson in this paper. The theoretical prediction for the strong decays of bottom–strange state $$B_{s3}^*$$ is also given. The relativistic wave functions of $$3^-$$ heavy mesons are constructed and their numerical values are obtained by solving the corresponding Bethe–Salpeter equation with instantaneous approximation. The transition matrix is calculated by using the PCAC and low energy theorem, following which the decay widths are obtained. For $$D_{3}^*(2760)$$ and $$D_{s3}^*(2860)$$, the total strong decay widths are 72.6 and 47.6 MeV, respectively. For $$B_3^*$$ with $$M=5978$$ MeV and $$B_{s3}^*$$ with $$M=6178$$ MeV, their strong decay widths are 22.9 and 40.8 MeV, respectively

From reasonable postulates to generalised Hamiltonian systems

Hamiltonian mechanics describes the evolution of a system through its Hamiltonian. The Hamiltonian typically also represents the energy observable, a Noether-conserved quantity associated with the time-invariance of the law of evolution. In both quantum and classical mechanics, Hamiltonian mechanics demands a precise relationship between time evolution and observable energy, albeit using slightly different terminology. We distil basic conditions satisfied in both quantum and classical mechanics, including canonical coordinate symmetries and inner product invariance. We express these conditions in the framework of generalised probabilistic theories, which includes generalizing the definition of energy eigenstates in terms of time-invariant properties of the Hamiltonian system. By postulating these conditions to hold, we derive a unified Hamiltonian system model. This unified framework describes quantum and classical mechanics in a consistent language, facilitating their comparison. We moreover discuss alternative theories: an equation of motion given by a mixture of commutation relations, an information-restricted version of quantum theory, and Spekken's toy theory. The findings give a deeper understanding of the Hamiltonian in quantum and classical theories and point to several potential research topics.Comment: 25 pages, 8 figure

Unification of energy concepts in generalised phase space theories

We consider how to describe Hamiltonian mechanics in generalised probabilistic theories with the states represented as quasi-probability distributions. We give general operational definitions of energy-related concepts. We define generalised energy eigenstates as the purest stationary states. Planck's constant plays two different roles in the framework: the phase space volume taken up by a pure state and a dynamical factor. The Hamiltonian is a linear combination of generalised energy eigenstates. This allows for a generalised Liouville time-evolution equation that applies to quantum and classical Hamiltonian mechanics and more. The approach enables a unification of quantum and classical energy concepts and a route to discussing energy in a wider set of theories.Comment: 5 pages and 2 pages of supplementary material. arXiv admin note: text overlap with arXiv:2403.0003

PIDray: A Large-scale X-ray Benchmark for Real-World Prohibited Item Detection

Automatic security inspection relying on computer vision technology is a challenging task in real-world scenarios due to many factors, such as intra-class variance, class imbalance, and occlusion. Most previous methods rarely touch the cases where the prohibited items are deliberately hidden in messy objects because of the scarcity of large-scale datasets, hindering their applications. To address this issue and facilitate related research, we present a large-scale dataset, named PIDray, which covers various cases in real-world scenarios for prohibited item detection, especially for deliberately hidden items. In specific, PIDray collects 124,486 X-ray images for $12$ categories of prohibited items, and each image is manually annotated with careful inspection, which makes it, to our best knowledge, to largest prohibited items detection dataset to date. Meanwhile, we propose a general divide-and-conquer pipeline to develop baseline algorithms on PIDray. Specifically, we adopt the tree-like structure to suppress the influence of the long-tailed issue in the PIDray dataset, where the first course-grained node is tasked with the binary classification to alleviate the influence of head category, while the subsequent fine-grained node is dedicated to the specific tasks of the tail categories. Based on this simple yet effective scheme, we offer strong task-specific baselines across object detection, instance segmentation, and multi-label classification tasks and verify the generalization ability on common datasets (e.g., COCO and PASCAL VOC). Extensive experiments on PIDray demonstrate that the proposed method performs favorably against current state-of-the-art methods, especially for deliberately hidden items. Our benchmark and codes will be released at https://github.com/lutao2021/PIDray.Comment: Tech. report. arXiv admin note: text overlap with arXiv:2108.0702

What explains Alibaba’s miraculous IPO success on the New York Stock Exchange?

Funding This work was supported by the Natural Science Foundation of China under Grant 72173036; the Natural Science Foundation of Hainan Province under Grant 721RC515. The authors are solely responsible for any error or omission herein. Funding Information: This work was supported by the National Natural Science Foundation of China under Grant 72173036; the Natural Science Foundation of Hainan Province under Grant 721RC515. The authors are solely responsible for any error or omission herein. Publisher Copyright: © 2022 Informa UK Limited, trading as Taylor & Francis Group.Peer reviewe