物理學家在歐洲核子研究組織發現一種新的大質量粒子
Physicists Discover a New Massive Particle at CERN
歐洲核子研究組織（CERN）的物理學家宣布了一項突破性的發現：一種名為 Xi-cc-plus（Ξcc+）的新次原子粒子。
Physicists at CERN have announced a groundbreaking discovery: a new subatomic particle called the Xi-cc-plus (Ξcc+).
此粒子於 2026 年 3 月 17 日由 LHCb 合作組識別，是一種重子（ㄓㄨㄥˋㄗˇ），即由三個夸克組成的複合粒子。
This particle, identified by the LHCb collaboration on March 17, 2026, is a baryon, which is a composite particle made of three quarks.
具體而言，Xi-cc-plus 包含兩個魅夸克（ㄇㄟˋㄎㄨㄚㄎㄜˋ）和一個下夸克。
Specifically, the Xi-cc-plus contains two charm quarks and one down quark.
由於魅夸克的質量遠大於標準質子中發現的上夸克，因此這種新粒子的質量是質子的四倍。
Because charm quarks are much heavier than the up quarks found in standard protons, this new particle is four times more massive.
研究人員使用升級後的 LHCb 探測器發現了該粒子，其靈敏度遠高於原始版本。
Researchers were able to spot the particle using upgraded LHCb detectors, which are significantly more sensitive than the original versions.
由於該粒子極不穩定且幾乎瞬間衰變，物理學家透過分析高能質子-質子碰撞後留下的殘骸來進行識別。
Since the particle is highly unstable and decays almost instantly, physicists identified it by analyzing the debris left behind after high-energy proton-proton collisions.
這項發現對量子色動力學（QCD）來說是一項重大勝利，該理論解釋了強核力。
This discovery is a significant win for Quantum Chromodynamics (QCD), the theory explaining the strong nuclear force.
