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粒子物理理论

Rare\begin{document}${{\Lambda_b \rightarrow \Lambda l^+ l^- }}$\end{document}decay in the Bethe-Salpeter equation approach

Liang-Liang Liu, Xian-Wei Kang, Zhen-Yang Wang, Xin-Heng Guo

, doi: 10.1088/1674-1137/44/8/083107

[摘要](21) [HTML全文](12) [PDF 0KB](0)

摘要:

We study the rare decays

\begin{document}$\Lambda_b \rightarrow \Lambda l^+ l^-~(l=e,\mu, \tau)$\end{document}

in the Bethe-Salpeter equation approach. We find that the branching ratio is

${\rm Br}(\Lambda_b \rightarrow \Lambda \mu^+ \mu^-)\times 10^{6} = 1.051 \sim 1.098$

in our model. This result agrees with the experimental data well. In the same parametric region, we find that the branching ratio is

${\rm Br}(\Lambda_b \rightarrow \Lambda e^+ e^-(\tau^+ \tau^-) )\times 10^{6} = 0.252 \sim 0.392 ~(0.286 \sim 0.489)$

论文

Single-photon avalanche diode imagers in biophotonics: review and outlook

Claudio Bruschini, Harald Homulle, Ivan Michel Antolovic, Samuel Burri, Edoardo Charbon

, doi: 10.1038/s41377-019-0191-5

[摘要](99) [HTML全文](50) [PDF 0KB](0)

摘要:
Single-photon avalanche diode (SPAD) arrays are solid-state detectors that offer imaging capabilities at the level of individual photons, with unparalleled photon counting and time-resolved performance. This fascinating technology has progressed at a very fast pace in the past 15 years, since its inception in standard CMOS technology in 2003. A host of architectures have been investigated, ranging from simpler implementations, based solely on off-chip data processing, to progressively "smarter" sensors including on-chip, or even pixel level, time-stamping and processing capabilities. As the technology has matured, a range of biophotonics applications have been explored, including (endoscopic) FLIM, (multibeam multiphoton) FLIM-FRET, SPIM-FCS, super-resolution microscopy, time-resolved Raman spectroscopy, NIROT and PET. We will review some representative sensors and their corresponding applications, including the most relevant challenges faced by chip designers and end-users. Finally, we will provide an outlook on the future of this fascinating technology.

减灾智能服务

新时代应急测绘保障技术体系框架设计

赵勇, 刘万增万增万增, 李然, 朱秀丽, 翟曦

, doi: 10.13203/j.whugis20200134

[摘要](19) [HTML全文](7) [PDF 0KB](0)

摘要:
应急测绘保障工作是中国综合防灾减灾工作体系的重要组成部分，在重大自然灾害及突发事件处置中的作用日益凸显。应急测绘保障工作存在现场信息快速获取能力不足、数据处理系统快速反应能力不强、应需服务能力不够、无法充分快速共享应急地理信息等问题。根据应急测绘保障工作的特点，基于国家应急测绘保障能力建设项目成果，提出了新时代应急测绘保障技术体系的总体思路和总体框架，实现对灾害现场信息“看得清、传得快、用得好”，并阐述了主要环节的关键技术进展，展望了其在地质灾害防治中的应用。

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