particle physicist       
noun [ C ] uk/ˌpɑː.tɪ.kəl ˈfɪz.ɪ.sɪst/ us/ˌpɑːr.t̬ə.kəl ˈfɪz.ɪ.sɪst/
 量子物理学家
someone who studies the part of physics that relates to particles (= extremely small pieces of matter)
  My daughter is a particle physicist.  我女儿是量子物理学家。 
 See: particle physics
 - More examples
 - Particle physicists seek answers to nature's most profound questions, such as what we are made of.
 - Particle physicists have spent several decades building bigger and more powerful accelerators, the better to smash subatomic particles together to see what's inside.
 - He brought in a particle physicist to offer lessons on the science of the sun.