![]() The spin statistics theorem tells us that leptons are fermions and thus Pauli’s exclusion law implies on them and thus no two leptons having the same species cannot have the same state at the same time. Martin Lewis Perl with his colleagues SLAC LBL group discovery tau during a series of experiments between 19 ( while tau neutrino was discovered by the missing energy and momentum in the decay ).Īnd all the present data is consistent with all the three generations of leptons but particle physicists are still trying to find the fourth generation of the leptons. To preserve the conservation of energy, conservation of momentum and conservation of angular momentum in beta decay Wolf in 1930 gave its postulate for electron neutrino( in the starting it was only called neutrino as it was known yet that neutrino can have different flavours or be present in different generation ) and muon was discovered by Carl D Anderon in 1936 ( nearly after 40 years the discovery of the electrons ) and due to its mass it was in the beginning considered as a meson later it was observed that muon is more similar to electron than to meson. J.J Thomason with his team of british physicist in 1897 for the first time discovered electrons ( which was the first lepton to be discovered). The electric charge on the charged lepton is -1 e, 0 e, +1 e History of Leptons The third generation leptons are called tauonic leptones which comprises of tau and tau neutrino ![]() The second generation leptons are called muonic leptones which comprises of muon and muon neutrino The first generation leptones are called electronic leptons which comprises of electron and electron neutrino The charged leptons can combine with other particles to form composite particles such as atoms and positronium ( it is the reverse of electron it has the same mass but with a positive charge )while the neutrino rarely reacts with any other particle and they are rarely taken into observation and the best known lepton is electrons( electrons also have least mass of all charged leptons).Īccording to the above two classes it is divided into six types and grouped into three generation that are: ![]() Neutrally charged lepton ( also called neutrinos ) It is relevant that atom is made up of nuclei and electron and it is bound by electromagnetic force and it is also known that mass of the electron is very small when compared to mass of nuclei( it consists of neutron and proton) and they ( electrons) are negatively charged and protons are present in point like quarks feature which are “up” and “down” in the nuclei.Īccording to the particle physics, it is stated that leptons are elementary particles with half integral spin(½) and it does not go under any strong interaction and it is divided into two branches that are:Įlectrically charged lepton ( also called electron like lepton) ![]()
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