<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">particle physics</topic></authority><related type="other"><topic>particle physicists</topic></related><related type="broader"><topic>physics</topic></related><variant type="other"><topic>elementary particle physics</topic></variant><variant type="other"><topic>high energy physics</topic></variant><variant type="other"><topic>high-energy physics</topic></variant><variant type="other"><topic>particle physics, elementary</topic></variant><variant type="other"><topic>physics, elementary particle</topic></variant><variant type="other"><topic>physics, high energy</topic></variant><variant type="other"><topic>physics, particle</topic></variant> <note xml:lang="en"><![CDATA[ Branch of physics that deals with the properties, relationships, and interactions of elementary particles, especially those produced in collisions involving very high energies. ]]></note></mads>