Υ介子 Upsilon meson
（重定向自Upsilon particle）
Υ介子（ϒ）是一种由底夸克和它的反粒子构成的无味的介子。它由费米国立加速器实验室的E288协作于1977年发现，领导者为1988年诺贝尔物理学奖得主利昂·莱德曼。这也是第一种被发现的含有底夸克的离子，因为它最轻，生成时不需要其他大质量的离子。它的平均寿命为1.21×10 s，质量约为9.46 GeV/c。
Upsilon particle
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Upsilon meson Υ介子
（重定向自Upsilon particle）
The Upsilon meson (ϒ) is a quarkonium state (i.e. flavourless meson) formed from a bottom quark and its antiparticle. It was discovered by the E288 collaboration, headed by Leon Lederman, at Fermilab in 1977, and was the first particle containing a bottom quark to be discovered because it is the lightest that can be produced without additional massive particles. It has a lifetime of 1.21×10 s and a mass about 9.46 GeV/c in the ground state.
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