| 1927 |
\(\beta\) decay discovered |
|
| 1928 |
|
Paul Dirac: Wave equation for electron |
| 1930 |
|
Wolfgang Pauli suggests existence of neutrino |
| 1931 |
Positron discovered |
|
| 1931 |
|
Paul Dirac realises that positrons are part of his equation |
| 1931 |
Chadwick discovers neutron |
|
| 1933/4 |
|
Fermi introduces theory for \(\beta\) decay |
| 1933/4 |
|
Hideki Yukawa discusses nuclear binding in terms of pions |
| 1937 |
\(\mu\) discovered in cosmic rays |
|
| 1938 |
Baryon number conservation |
|
| 1946 |
|
\(\mu\) is not Yukawa’s particle |
| 1947 |
\(\pi^{+}\) discovered in cosmic rays |
|
| 1946-50 |
|
Tomonaga, Schwinger and Feynman develop QED |
| 1948 |
First artificial \(\pi\)’s |
|
| 1949 |
\(K^{+}\) discovered |
|
| 1950 |
\(\pi^{0}\rightarrow \gamma\gamma\) |
|
| 1951 |
”V-particles” \(\Lambda^{0}\) and \(K^{0}\) |
|
| 1952 |
\(\Delta\): excited state of nucleon |
|
| 1954 |
|
Yang and Mills: Gauge theories |
| 1956 |
|
Lee and Yang: Weak force might break parity! |
| 1956 |
CS Wu and Ambler: Yes it does. |
|
| 1961 |
|
Eightfold way as organising principle |
| 1962 |
\(\nu_{\mu}\) and \(\nu_{e}\) |
|
| 1964 |
|
Quarks (Gell-man and Zweig) \(u,d,s\) |
| 1964 |
|
Fourth quark suggested (\(c\)) |
| 1965 |
|
Colour charge all particles are colour neutral! |
| 1967 |
|
Glashow-Salam-Weinberg unification of electromagnetic and weak interactions. Predict Higgs boson. |
| 1968-69 |
DIS at SLAC constituents of proton seen! |
|
| 1973 |
|
QCD as the theory of coloured interactions. Gluons. |
| 1973 |
|
Asymptotic freedom |
| 1974 |
\(J/\psi\) (\(c\bar c\)) meson |
|
| 1976 |
\(D0\) meson (\(\bar u c\)) confirms theory. |
|
| 1976 |
\(\tau\) lepton! |
|
| 1977 |
b (bottom quark). Where is top? |
|
| 1978 |
Parity violating neutral weak interaction seen |
|
| 1979 |
Gluon signature at PETRA |
|
| 1983 |
\(W^{\pm}\) and \(Z^{0}\) seen at CERN |
|
| 1989 |
SLAC suggests only three generations of (light!) neutrinos |
|
| 1995 |
t (top) at 175 GeV mass |
|
| 1997 |
New physics at HERA (200 GeV) |
|
