# Question about particle physics in general

1. Jun 2, 2013

### Thundagere

So I read that fermions can be defined as "matter particles," while bosons can be defined as "force carrier particles." I read further that fermions can be divided into quarks and leptons.
However, apparently mesons are considered bosons, as a consequence of their spins. Does that mean that, despite being composed of two quarks, a fermion, mesons are bosons?

2. Jun 2, 2013

### ZapperZ

Staff Emeritus
This categorization is incorrect, and is not general.

Fermions are "particles" with integral 1/2 spins, i.e. spin of 1/2, 3/2, 5/2, etc. An electron is a fermion, and it CANNOT be divided into quarks and leptons.

A boson has integral spin, i.e. 0, 1, 2, 3, etc. A photon is a boson, it definitely is not composed of 2 quarks.

Zz.

3. Jun 2, 2013

### Thundagere

So the particles defined by their spin, and not by whether they are matter particles or force particles?