November 28th, 2019

лошадь, диаграмма, Фейнман

Воробушки едят плоды липы - 2

В предыдущем посте на эту тему я обещал сделать анимированную гифку того, как воробушек срывает плодик липы. Вот она:


воробей_срывает_плод_липы.gif © qedqed.iMGSRC.RU


Обратите внимание, что на первом кадре он толко прицеливается к плодику, а на втором он уже сорван:))
лошадь, диаграмма, Фейнман

Статистические методы проверки гипотез на примере открытия бозона Хиггса

Учебная статья неких марокканцев:

Statistical tools and precision of searching for the Higgs boson at the LHC: https://arxiv.org/abs/1911.09004

Statistical tools have been developed to quantify the agreement between a hypothesis or a model and the observed data for probabilistic phenomena. In this work, we define statistical methods used to measure the properties of the higgs boson in the LHC on the one hand, but also to evaluate the uncertainty and precision on these measurements. They are based on the definition of a likelihood function whose construction will be detailed below. The challenge of HEP is to generate tons of data and to develop powerful analyses to tell if the data indeed contains evidence for the new particle, and confirm it's the expected Higgs boson.
лошадь, диаграмма, Фейнман

Куча современных экспериментальных данных о том, как проявляется оболочечная структура ядер

и еще кое-что, с философскими обобщениями:)

Emergence of simple patterns in many-body systems: from macroscopic objects to the atomic nucleus: https://arxiv.org/abs/1911.04819

Strongly correlated many-body systems often display the emergence of simple patterns and regular behaviour of their global properties. Phenomena such as clusterization, collective motion and appearance of shell structures are commonly observed across different size, time, and energy scales in our universe. Although at the microscopic level their individual parts are described by complex interactions, the collective behaviour of these systems can exhibit strikingly regular patterns. This contribution provides an overview of the experimental signatures that are commonly used to identify the emergence of shell structures and collective phenomena in distinct physical systems. Examples in macroscopic systems are presented alongside features observed in atomic nuclei. The discussion is focused on the experimental trends observed for exotic nuclei in the vicinity of nuclear closed-shells, and the new challenges that recent experiments have posed in our understanding of emergent phenomena in nuclei.
Comments: Invited contribution prepared for the special issue of "The tower of effective (field) theories and the emergence of nuclear phenomena