Well, in physics, momentum is a vector, and it is a product between the mass of a particle and its velocity.

物理中，动量是矢量，它产生于,由粒子的质量与速度。

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Two new looks at the gamma-ray sky suggest that if the mysterious matter is a particle, it is heavier than 40 gigaelectronvolts, about 44 times the mass of a proton.

两项最新伽马射线天空图的观测研究表明如果此种神秘物质是粒子，则要大约是一个质子质量的44倍，比400亿电子伏还重。

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What physicists are basically doing is making the collisions as powerful and as efficient as possible to turn particle mass into pure energy (as a result of Einstein's bedrock equation E=mc2).

物理学家们做的这些事的本质就是尽可能让这些对撞充满能量并且高效以使这些粒子的质量转换为纯能量（这是爱因斯坦颠补不破的方程E=mc2的结果）。

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It's a particle of mass m and momentum p has this energy so you solve for the energy, you get two answers.

一个质量为m,动量为p的粒子,有这么大的能量,你解出能量,得到两个解

耶鲁公开课 - 基础物理课程节选

Because nobody knows what the mass of a Higgs boson might be, the particle must be hunted indirectly, typically in giant machines that propel particles to near-light speed, then smash them together and generate an array of other subatomic particles.

WSJ: Physicists Find Signs of Higgs Boson, or 'God Particle'

The frequency at which it happens is related to a small but significant difference between the mass of the particle and its antiparticle.

ECONOMIST: Cosmology and particle physics

Certain particles will attract larger clusters of Higgs bosons -- and the more Higgs bosons a particle attracts, the greater its mass will be.

CNN: STORY HIGHLIGHTS