Fri . 20 Jul 2020
TR | RU | UK | KK | BE |


g-parity and rho decays, g parity
In theoretical physics, G-parity is a multiplicative quantum number that results from the generalization of C-parity to multiplets of particles

C-parity applies only to neutral systems; in the pion triplet, only π0 has C-parity On the other hand, strong interaction does not see electrical charge, so it cannot distinguish amongst π+, π0 and π− We can generalize the C-parity so it applies to all charge states of a given multiplet:

G π + π 0 π − = η G π + π 0 π − }\pi ^\\\pi ^\\\pi ^\end}=\eta _\pi ^\\\pi ^\\\pi ^\end}}

where ηG = ±1 are the eigenvalues of G-parity The G-parity operator is defined as

G = C e i π I 2 }=}\,e^}}

where C }} is the C-parity operator, and I2 is the operator associated with the 2nd component of the isospin "vector" G-parity is a combination of charge conjugation and a π rad 180° rotation around the 2nd axis of isospin space Given that charge conjugation and isospin are preserved by strong interactions, so is G Weak and electromagnetic interactions, though, are not invariant under G-parity

Since G-parity is applied on a whole multiplet, charge conjugation has to see the multiplet as a neutral entity Thus, only multiplets with an average charge of 0 will be eigenstates of G, that is

Q ¯ = B ¯ = Y ¯ = 0 }=}=}=0}

see Q, B, Y

In general

η G = η C − 1 I =\eta _\,-1^}

where ηC is a C-parity eigenvalue, and I is the isospin For fermion-antifermion systems, we have

η G = − 1 S + L + I =-1^\,}

where S is the total spin, L the total orbital angular momentum quantum number For boson–antiboson systems we have

η G = − 1 L + I =-1^\,}

See also

  • Quark model


  • T D Lee and C N Yang 1956 "Charge conjugation, a new quantum number G, and selection rules concerning a nucleon-antinucleon system" Il Nuovo Cimento 3 4: 749–753 Bibcode:1956NCim3749L doi:101007/BF02744530 
  • Charles Goebel 1956 "Selection Rules for NN̅ Annihilation" Phys Rev 103 1: 258–261 Bibcode:1956PhRv103258G doi:101103/PhysRev103258 

g parity, g-parity and rho decays

G-parity Information about


  • user icon

    G-parity beatiful post thanks!


G-parity viewing the topic.
G-parity what, G-parity who, G-parity explanation

There are excerpts from wikipedia on this article and video

Random Posts

Timeline beyond October following the September 11 attacks

Timeline beyond October following the September 11 attacks

The following list contains certain dates beyond October 2001 involving the September 11 attacks ...
Smash Hits

Smash Hits

Smash Hits was a pop music magazine, aimed at teenagers and young adults and originally published in...
2014–15 USC Trojans women's basketball team

2014–15 USC Trojans women's basketball team

The 2014–15 USC Trojans women's basketball team will represent University of Southern California dur...
Trademark classification

Trademark classification

A trademark classification is a way the trademark examiners and applicants' trademark attorneys arra...