Search results
Results from the WOW.Com Content Network
Mesons named with the letter "f" are scalar mesons (as opposed to a pseudo-scalar meson), and mesons named with the letter "a" are axial-vector mesons (as opposed to an ordinary vector meson) a.k.a. an isoscalar vector meson, while the letters "b" and "h" refer to axial-vector mesons with positive parity, negative C-parity, and quantum numbers I G of 1 + and 0 − respectively.
Such transitions involve a change of the internal charm quantum number, and can take place only via the weak interaction. In D mesons, the charm quark preferentially changes into a strange quark via an exchange of a W particle, therefore the D meson preferentially decays into kaons (K) and pions (π). [1]
Parton, is a generic term coined by Feynman for the sub-particles making up a composite particle – at that time a baryon – hence, it originally referred to what are now called "quarks" and "gluons". Odderon, a particle composed of an odd number of gluons, detected in 2021.
In thermodynamics, the particle number (symbol N) of a thermodynamic system is the number of constituent particles in that system. [1] The particle number is a fundamental thermodynamic property which is conjugate to the chemical potential. Unlike most physical quantities, the particle number is a dimensionless quantity, specifically a ...
Similarly, the muons and their neutrinos are assigned a muon number of +1 and the tau leptons are assigned a tau lepton number of +1. The Standard Model predicts that each of these three numbers should be conserved separately in a manner similar to the way baryon number is conserved. These numbers are collectively known as lepton family numbers ...
In particle physics, the quark model is a classification scheme for hadrons in terms of their valence quarks—the quarks and antiquarks that give rise to the quantum numbers of the hadrons. The quark model underlies "flavor SU(3)" , or the Eightfold Way , the successful classification scheme organizing the large number of lighter hadrons that ...
This second-generation particle is the third-most-massive quark, with a mass of 1.27 ± 0.02 GeV/c 2 as measured in 2022, and a charge of + 2 / 3 e. The existence of the charm quark was first predicted by James Bjorken and Sheldon Glashow in 1964, [ 1 ] [ 2 ] [ 3 ] and in 1970, Glashow, John Iliopoulos , and Luciano Maiani showed how ...
In particle physics, a kaon, also called a K meson and denoted K, [a] is any of a group of four mesons distinguished by a quantum number called strangeness. In the quark model they are understood to be bound states of a strange quark (or antiquark) and an up or down antiquark (or quark).