What is a hadron and what is it made of?
A hadron is a composite subatomic particle formed by quarks and gluons. It is composed of two up quarks and one down quark for protons, or other combinations of quarks and antiquarks.
Questions about Hadron
Short answers, pulled from the story.
When was the term hadron first introduced in science?
The term hadron was introduced on the 2nd of May 1962 by Soviet physicist L. B. Okun. He presented the term during a plenary talk at the International Conference on High Energy Physics at CERN.
How are hadrons categorized into different families?
Hadrons are categorized into two broad families called baryons and mesons based on the number of quarks they contain. Baryons consist of three quarks while mesons consist of a quark and an antiquark pair.
Why are most hadrons unstable and what is the exception?
Most free hadrons are unstable and decay within fractions of a second due to the strong force. The proton is the only known exception that appears to be stable for at least 10 to the power of 34 years.
What happens to hadrons at very high temperatures and pressures?
At very high temperatures and pressures, hadrons disappear as quarks and gluons break free from confinement. This state is known as quark-gluon plasma and occurs in the energy range between 1 gigaelectronvolt and 1 teraelectronvolt.