A tetraquark, in particle physics, is a hypothetical exotic meson composed of four valence quarks. In principle, a tetraquark state may be allowed in quantum chromodynamics, the modern theory of stron ...
Lattice QCD predictions for glueballs are now fairly stable, at least when virtual quarks are neglected. The two lowest states are0++ with mass of 1611±163 MeV/c2 and2++ with mass of 2232±310 MeV/c2 ...
The traditional function of a signature is evidential: it is to give evidence of:The provenance of the document (identity)The intention (will) of an individual with regard to that documentFor example, ...
The background to the discovery of the J/ψ was both theoretical and experimental. In the 1960s, the first quark models of elementary particle physics were proposed, which said that protons, neutrons ...
The nuclear force has been at the heart of nuclear physics ever since the field was born in 1932 with the discovery of the neutron by James Chadwick. The traditional goal of nuclear physics is to unde ...
The four kaons are :The negatively charged K? (containing a strange quark and an up antiquark) has mass 493.667±0.013 MeV and mean lifetime (1.2384±0.0024)×10?8 s.Its antiparticle, the positively ...
Pions are mesons with zero spin, and they are composed of first-generation quarks. In the quark model, an up quark and an anti-down quark make up a π+, whereas a down quark and an anti-up quark make ...
Because this table was initially derived from published results and many of those results were preliminary, as many as 64 of the mesons in the following table may not exist or have the wrong mass or q ...
In the mid-2000s, several experiments claimed to reveal pentaquark states. In particular, a resonance with a mass of 1540 MeV/c2 (4.6 σ) was reported by LEPS in 2003, the Θ+. This coincided with a p ...
Exotic baryons are hypothetical composite particles that are bound states of 4 or more quarks and additional elementary particles. This is to be contrasted with ordinary baryons, which are bound state ...
A hypernucleus is a nucleus which contains at least one hyperon in addition to nucleons. The first was discovered by Marian Danysz and Jerzy Pniewski in 1952.Since the strangeness quantum number is co ...
Properties and behavior of hyperons A combination of three u, d or s-quarks with a total spin of 3/2 form the so-called baryon decuplet. The lower six are hyperons.Being baryons, all hyperons are ferm ...
The neutron plays an important role in many nuclear reactions. For example, neutron capture often results in neutron activation, inducing radioactivity. In particular, knowledge of neutrons and their ...
Protons are spin-? fermions and are composed of three valence quarks, making them baryons (a sub-type of hadrons). The two up quarks and one down quark of the proton are held together by the strong f ...
Main articles: Proton and NeutronProperties Nucleon quark compositionProtonProton (p): uudNeutronNeutron (n): uddAntiprotonAntiproton (p): uudAntineutronAntineutron (n): uddProtons and neutrons are mo ...
