Subatomic particle

A subatomic particle is a constituent of matter or radiation smaller than an atom. It may be elementary or composite.

A hadron is a composite subatomic particle bound by the strong interaction.

A baryon is a hadron with half-integer spin and baryon number one; ordinary baryons consist of three valence quarks.

A Delta baryon is a short-lived spin-three-halves baryon resonance.

The Delta-plus baryon is the electrically charged $+1$ member of the Delta baryon multiplet.

The proton is the positively charged spin-one-half baryon found in atomic nuclei. Its mass is approximately $1836$ times the Electron mass.

The electron is a negatively charged elementary lepton of mass $m_e$.