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.

Treat quarks as identical fermions with states labelled with spatial, spin, flavour and colour. P represents intrinsic Parity of a particle/antiparticle. Parity is a useful concept. If the Hamiltonian for an interaction commutes with ˆP h i ˆP , ˆH = 0. Parity conserved in the strong and EM interactions, but not in the weak interaction.

Isospin Adding (iso-)spins Strange particles The quark model The quark model Quarks In 1964 Gell-Mann and Zweig proposed three “hypothetical” quarks, up, down and strange, a mnemonic help. All known hadrons are their “bound states”: Mesons are made from a …

2022年8月11日 · QCD is believed to confine, that is, its physical states are color singlets with internal quark and gluon degrees of freedom. This review is concerned with the description of the properties (masses and matrix elements for couplings to electromagnetism and the weak intractions) of the low lying bound states of QCD.

A quark (/ k w ɔːr k, k w ɑːr k /) is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons , the most stable of which are protons and neutrons , the components of atomic nuclei . [ 1 ]

the role of the minimum-quark-content part of the wave function of a hadron is generically called the quark model. It exists on many levels: from the simple, almost dynamics-free picture of strongly interacting particles as bound states of quarks and antiquarks, to more

2019年12月6日 · Quantum chromodynamics (QCD) is the theory of strong interactions. QCD is a quantum field theory and its constituents are a set of fermions, the quarks, and gauge bosons, the gluons. Strongly interacting particles, the hadrons, are bound states of quark and gluon fields.

Nuclear and Particle Physics Franz Muheim 5 Quark Model 3 Quark Flavours u, d, s 1964 - introduced by Gell-Mann & Zweig Charge, Isospin and Strangeness Additive quark quantum numbers are related Q = I 3 + ½(S + B) not all independent Gell-Mann Nishijima predates quark model valid also for hadrons Baryon number B quarks B = +1/3 anti-quarks B ...

2025年1月20日 · Gell-Mann and Zweig required only three quarks to build the particles known in 1964. These quarks are the ones known as up (u), down (d), and strange (s). Since then, experiments have revealed a number of heavy hadrons —both mesons and baryons —which show that there are more than three quarks.

2019年8月29日 · This chapter presents the quark model of hadrons. It discusses the quark description of the quark antiquark systems of c and b quarks. It then describes the structure of the lightest mesons and baryons as bound states of u, d, and s quarks.