Tag Archives: spin

Parity transformation changes helicity

This post is the continuation of the Parity Transformation tutorial where I demonstrated the parity transformation in 2D by using the shape of letter L. Figure (1) The image to the left of the vertical axis is the reflection of the letter … Continue reading

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Why does everything rotate?

All astronomical objects rotate. Earth, Moon, Sun, Milky Way, other planets, other stars,  and other galaxies all rotate. Black holes rotate too. All elementary constituents of matter (fermions) and all force carrying quanta (gauge bosons) have intrinsic spin which cannot … Continue reading

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Constancy of spin angular momentum irrespective of energy

Image credit Leptons (electron, muon, tau and their corresponding neutrinos and their anti-particle versions) and quarks (u, d, c, s, b, t quarks and their anti-quarks) belong to a category known as fermions. Members of this category are the constituents … Continue reading

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There are no right-handed neutrinos

There are right-handed anti-neutrinos but no right-handed neutrinos. Image credit The “left-handedness” or “right-handedness” refer to the chirality of a fermion. Elementary particles with spin=1/2 are known as fermions. Neutrino is a fermion because it has spin=1/2. Chirality is different … Continue reading

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Charged lepton flavor violation has never been observed

Particle physicists use “generation” and “flavor” interchangeably, “generation” and “flavor” refer to the same property. first generation leptons: electron and electron-type neutrino second generation leptons: muon and muon-type neutrino third generation leptons: tau and tau-type neutrino Reminder: each one of … Continue reading

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What is Spin?

Spin is one of the fundamental properties of elementary particles. Electron and its antiparticle positron have spin=1/2. Photon which has no antiparticle has spin 1. The elementary particles known as fermions and their antiparticles (constituents of matter) have spin=1/2 and … Continue reading

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