# What is a pseudoscalar particle?

## What is a pseudoscalar particle?

Pseudoscalar particles, i.e. particles with spin 0 and odd parity, that is, a particle with no intrinsic spin with wave function that changes sign under parity inversion. Examples are pseudoscalar mesons.

Why is the pion a pseudoscalar?

The answer is based on a comment by Cosmas Zachos. The pion has no spin, and so can’t flip the spin of either nucleon in the deuteron.

How many types of mesons are there?

More than 200 mesons have been produced and characterized in the intervening years, most in high-energy particle-accelerator experiments.

### Are mesons a vector bosons?

Spin one mesons are called vector bosons. Pi mesons were originally thought to transmit the strong nuclear force until the underlying colour force was discovered. Some bosons are fundamental particles such as the photon. A vector boson has a spin of 1.

Is pseudoscalar current?

Current is what is known as a pseudoscalar. This justification for this comes from the definition of current. Current, I, is defined as the net flow of charge per unit time through some surface.

Is volume a pseudoscalar?

In general relativity 4-volume element d4x=dx0dx1dx2dx3 is clearly a pseudoscalar (or scalar density) of weight 1 since it transforms as d4x→d4x′=Jd4x, with J Jacobian determinant of the coordinates transformation.

#### What are pions and kaons?

Pions and kaons are, along with protons and neutrons, the main building blocks of nuclear matter. They are connected to the Goldstone modes of dynamical chiral symmetry breaking, the mechanism thought to generate all hadron mass in the visible universe.

What are pions and muons?

Whereas the muon is uninfluenced by the strong force that works inside the nucleus, the pion plays a role in binding protons with neutrons. This means that high-energy muons can penetrate far into matter before they interact or decay; indeed, some cosmic-ray muons travel hundreds of metres below ground.

What are examples of mesons?

A meson is a combination of a quark and anti-quark of the opposite color. Examples of mesons are the p, h, r and w mesons. Mesons do not last long because they have no net baryon or net lepton number and can decay. For instance a p0 meson can decay into two photons.

## What are the 6 types of leptons?

There are 6 types of leptons: electron, electron neutrino, muon, muon neutrino, tau and tau neutrino. For each of these, the neutrino brand carries a neutral charge, while their counterparts all have a negative charge.

Are mesons fermions or bosons?

Mesons are intermediate mass particles which are made up of a quark-antiquark pair. Three quark combinations are called baryons. Mesons are bosons, while the baryons are fermions.

Is Higgs boson a vector boson?

Feynman diagram of the fusion of two electroweak vector bosons to the scalar Higgs boson, which is a prominent process of the generation of Higgs bosons at particle accelerators. (The symbol q means a quark particle, W and Z are the vector bosons of the electroweak interaction. H0 is the Higgs boson.)