two-component neutrino theory was proposed at the same time by. Landau (CP invariance) and Salam ( γ5 invariance) According to this theory helicity of neutrino (antineutrino) is equal. to -1 (+1) in the case of νL(x) and, correspondingly, +1 (-1) in. the case of νR(x)

However, the oscillations at 9.5 (neutrino flux) and 11 (decay rate) cycles per year are more difficult to reconcile.

82 2640). According to the Standard Model of particle physics, the three types of neutrinos – electron, muon and tau neutrinos – have zero mass. In the Dirac model, neutrinos decay into undetectable particles, while in the Majorana model, muon neutrinos decay into anti-tau neutrinos, which could be detected.

The neutrino was postulated first by Wolfgang Pauli in 1930 to explain how beta decay could conserve energy, momentum, and angular momentum (spin).

Neutrinos are born in various decays, which is when a particle changes from one type into another. In a beta decay, a neutron (made of one up quark and two down quarks) can transform into a proton (made of two up quarks and one down quark), an electron, and an electron antineutrino.

An antineutrino is the antiparticle partner of the neutrino, meaning that the antineutrino has the same mass but opposite “charge” of the neutrino. Although neutrinos are electromagnetically neutral (they have no electric charge and no magnetic moment), they may carry another kind of charge: lepton number.

Neutrinos are born in various decays, which is when a particle changes from one type into another. This is particle decay. A common example is when the muon decays into an electron, an electron antineutrino, and a muon neutrino (μ → e + ¯νe + νμ).

A neutrino is a particle! It’s one of the so-called fundamental particles, which means it isn’t made of any smaller pieces, at least that we know of. Neutrinos are members of the same group as the most famous fundamental particle, the electron (which is powering the device you’re reading this on right now).

Perhaps the most important thing to know about neutrinos is that they come in three types, or flavors:

• electron neutrino (νe)
• muon neutrino (νμ)
• tau neutrino (ντ)

Two types of beta decay can occur. One type (positive beta decay) releases a positively charged beta particle called a positron, and a neutrino; the other type (negative beta decay) releases a negatively charged beta particle called an electron, and an antineutrino.

neutrino, elementary subatomic particle with no electric charge, very little mass, and 1/2 unit of spin. Neutrinos belong to the family of particles called leptons, which are not subject to the strong force. Rather, neutrinos are subject to the weak force that underlies certain processes of radioactive decay.