Particle Physics | DMS Learning

Chronological Development of Elementary Particles

The Standard Model explains strong, weak and electromagnetic interactions. The famous relation $E=mc^2$ shows the equivalence of mass and energy.

Year / Period	Scientist(s)	Discovery / Development	Significance
1897	J. J. Thomson	Discovery of the Electron	First identification of a subatomic particle; showed that atoms are not indivisible.
1911–1919	Ernest Rutherford	Discovery of Atomic Nucleus and Proton	Established nuclear model of the atom and identified the proton as a fundamental particle.
1932	James Chadwick	Discovery of the Neutron	Completed the basic picture of the atomic nucleus and explained isotopes.
1930–1956	W. Pauli, E. Fermi, C. Cowan, F. Reines	Prediction and Discovery of the Neutrino	Introduced a new class of weakly interacting particles essential for beta decay.
1935–1950s	Hideki Yukawa & others	Prediction and Discovery of Mesons	Explained nuclear forces and introduced force-carrying particles.
1950s–1960s	Various researchers	Discovery of Numerous Hadrons	Led to the so-called “particle zoo,” necessitating a deeper classification scheme.
1964	M. Gell-Mann, G. Zweig	Quark Model Proposed	Explained the structure of hadrons in terms of fundamental quark constituents.
1970s	Weinberg, Salam, Glashow	Electroweak Theory	Unified electromagnetic and weak interactions; predicted W and Z bosons.
1983	CERN Experiments	Discovery of W and Z Bosons	Experimental confirmation of electroweak unification.
1995	Fermilab	Discovery of the Top Quark	Completed the third generation of quarks.
2012	CERN (ATLAS & CMS)	Discovery of the Higgs Boson	Explained the origin of mass of elementary particles; completed the Standard Model.