Proton spin crisis - Wikipedia
The proton spin crisis (or proton spin puzzle) is a theoretical crisis precipitated by a 1987 experiment by the European Muon Collaboration (EMC), [1] which tried to determine the …
The spin of a proton – Physics World
Jun 4, 2015 · Spin is a quantum-mechanical property, akin to the angular momentum of a classical sphere rotating on its axis, except it comes in discrete units of integer or half-integer …
Spin (physics) - Wikipedia
Spin is described mathematically as a vector for some particles such as photons, and as a spinor or bispinor for other particles such as electrons. Spinors and bispinors behave similarly to …
What we know and what we don’t know about the proton spin …
Nov 23, 2020 · There are two established approaches to look at the composition of the proton spin: the frame-independent spin structure (or the Ji sum rule) and the infinite-momentum …
質子自旋危機 - 维基百科，自由的百科全书
質子自旋危機 （英語： Proton spin crisis），有時稱作「質子自旋之謎」，是1987年的一次實驗促成的理論危機，該實驗試著測定 質子 自旋的組成結構，由 歐洲μ子共同研究 （英 …
How Did the Proton Get Its Spin? | Department of Energy
Mar 29, 2017 · Protons are one of the three particles that make up atoms, the building blocks of the universe. A proton's spin is one of its most basic properties. Because protons are in part …
How Does the Proton Spin? | Science - AAAS
In analyzing these collisions, the key questions are: What happens to spin in the transition from current quarks (those probed in high-energy experiments) to constituent quarks (the building …
Theory and experiment combine to shine a new light on proton spin
May 24, 2024 · Now, a new method that combines experimental data with state-of-the-art calculations has revealed a more detailed picture of spin contributions from the very glue that …
Proton spin after 30 years: what we know and what we don't?
Sep 2, 2020 · Much theoretical and experimental progress has been made in understanding the origins of the proton spin. In this review, we will discuss what we have learned so far, what are …
Proton puzzles - Nature Reviews Physics
Jan 8, 2021 · Where does the proton spin come from? The proton is a spin-1/2 particle. It would seem reasonable to assume that its spin comes from the simple arithmetic of three component …