język: Quark

Evidence: 90 • authority: 72

A quark ( ) 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. All commonly observable matter is composed of up quarks, down quarks, and electrons. Owing to a phenomenon known as color confinement, quarks are never found in isolation; they can be found only within hadrons, which include baryons (such as protons and neutrons) and mesons, or in quark–gluon plasmas. For this reason, much of what is known about quarks has been drawn from observations of hadrons. Quarks have various intrinsic properties, including electric charge, m…

Evidence: 50 • authority: 80

Measuring polarizations of bottom, charm, strange, up and down quarks in top decays

Evidence: 45 • authority: 72

The continent of stability is a hypothesised large group of nuclides with masses greater than 300 daltons that is stable against radioactive decay, consisting of freely flowing up quarks and down quarks rather than up and down quarks bound into protons and neutrons. Matter containing these nuclides is termed up-down quark matter (udQM). The continent of stability is named in analogy with the island of stability. However, if it exists, the range of charge and mass will be much greater than in the island. Quark matter composed of up quarks and down quarks is predicted to be a lower energy state than that which contains strange quarks (strange quark matter), and also lower than the combination…

Evidence: 43 • authority: 92

High-precision calculation of the quark-gluon coupling from lattice QCD.. The outcomes of modern particle physics experiments, such as proton-proton collisions at the Large Hadron Collider at CERN (European Organization for Nuclear Research), depend crucially on the precise description of the scattering processes in terms of the fundamental forces. Among all the known forces that contribute, the limited understanding of the strong nuclear force is a key source of inaccuracy. At the fundamental level, the strong force is described by quantum chromodynamics, the theory of quarks and gluons. Their coupling, α s , becomes weaker at high energies (asymptotic freedom), enabling power series expan…

Evidence: 43 • authority: 80

Hadrons and quarks in high energy collisions

Evidence: 43 • authority: 80

Study the Collective Behavior of Quarks and Gluons in High Energy Nuclear Collisions. Final Report

Evidence: 43 • authority: 92

Measuring spin correlation between quarks during QCD confinement.. The vacuum is now understood to have a rich and complex structure, characterized by fluctuating energy fields 1 and a condensate of virtual quark-antiquark pairs. The spontaneous breaking of the approximate chiral symmetry 2 , signalled by the nonvanishing quark condensate ⟨qq¯⟩ , is dynamically generated through topologically nontrivial gauge configurations such as instantons 3 . The precise mechanism linking the chiral symmetry breaking to the mass generation associated with quark confinement 4 remains a profound open question in quantum chromodynamics (QCD)-the fundamental theory of strong interaction. High-energy proton-…

Evidence: 43 • authority: 72

In particle physics, a baryon is a type of composite subatomic particle that contains an odd number of valence quarks, conventionally three. Protons and neutrons are examples of baryons; because baryons are composed of quarks, they belong to the hadron family of particles. Baryons are also classified as fermions because they have half-integer spin. The name "baryon", introduced by Abraham Pais, comes from the Greek word for "heavy" (βαρύς, barýs), because, at the time of their naming, most known elementary particles had lower masses than the baryons. Each baryon has a corresponding antiparticle (antibaryon) where their corresponding antiquarks replace quarks. For example, a proton is made o…

Evidence: 39 • authority: 92

Proton and Neutron Properties from Unified Fractal Quantum Field Theory (UFQFT): A Resonance-Based Approach to Mass, Spin, and Binding Energies. In this study, we present a comprehensive calculation of the fundamental properties of the proton and neutron within the framework of the Unified Fractal Quantum Field Theory (UFQFT). Unlike conventional models where quarks are treated as confined point-like particles with gluon-mediated interactions, UFQFT describes quarks as stationary fractal resonances of two coupled fields: the energy field Φ and the charge field Ψ. Using this formalism, we derive explicit wave functions for up and down quarks, compute the proton and neutron mass from resonanc…

Evidence: 39 • authority: 92

Proton and Neutron Properties from Unified Fractal Quantum Field Theory (UFQFT): A Resonance-Based Approach to Mass, Spin, and Binding Energies. In this study, we present a comprehensive calculation of the fundamental properties of the proton and neutron within the framework of the Unified Fractal Quantum Field Theory (UFQFT). Unlike conventional models where quarks are treated as confined point-like particles with gluon-mediated interactions, UFQFT describes quarks as stationary fractal resonances of two coupled fields: the energy field Φ and the charge field Ψ. Using this formalism, we derive explicit wave functions for up and down quarks, compute the proton and neutron mass from resonanc…

Evidence: 39 • authority: 72

A proton is a stable subatomic particle, symbol p, H+, or 1H+ with a positive electric charge of +1 e (elementary charge). Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio). Protons and neutrons, each with a mass of approximately one dalton, are jointly referred to as nucleons (particles present in atomic nuclei). One or more protons are present in the nucleus of every atom. They provide the attractive electrostatic force binding the electrons. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number (represented by the symbol Z). The number…

Evidence: 39 • authority: 72

In physics, a subatomic particle is a particle smaller than an atom. According to the Standard Model of particle physics, a subatomic particle can be a composite particle or an elementary particle. A composite particle, such as a proton or a neutron, is composed of other particles, while an elementary particle, such as an electron, is not composed of any substructure. Particle physics and nuclear physics study these particles and how they interact. Most force-carrying particles are called bosons. Some bosons, such as photons and gluons, have zero rest mass, whereas others, such as the W and Z bosons and the Higgs boson, possess relatively large rest masses (approximately 80 GeV/c2, 90 GeV/c…