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Tomes & Talismans is a 1986 educational television series produced by Mississippi Public Broadcasting, consisting of thirteen 20-minute episodes presented as a dramatic serial story. Each episode defines, illustrates, and reviews specific library research concepts.
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] All commonly observable matter is composed of up quarks, down quarks and electrons.
However the top quark is extremely unstable, with a half-life under 10 −23 s, which is the required time for the strong interaction to take place. For that reason the top quark does not hadronize , that is it never forms any meson or baryon , so the topness of a meson or a baryon is always zero.
For instance a pentaquark made of two up quarks, one down quark, one charm quark, and one charm antiquark would be denoted uudc c. The quarks are bound together by the strong force, which acts in such a way as to cancel the colour charges within the particle. In a meson, this means a quark is partnered with an antiquark with an opposite colour ...
The combination of a top quark and top antiquark is not an open T meson, but rather a closed top-quark meson called toponium. Each T meson has an antiparticle that is composed of a top antiquark and an up (T 0), down (T −), strange (T − s), charm quark (T 0 c) or bottom quark (T − b) respectively.
Several tetraquark candidates have been reported by particle physics experiments in the 21st century. The quark contents of these states are almost all q q Q Q, where q represents a light (up, down or strange) quark, Q represents a heavy (charm or bottom) quark, and antiquarks are denoted with an overline.
Find non-theme words to get hints. For every 3 non-theme words you find, you earn a hint. Hints show the letters of a theme word. If there is already an active hint on the board, a hint will show ...
Baryons (three quarks) have a baryon number of +1, mesons (one quark, one antiquark) have a baryon number of 0, and antibaryons (three antiquarks) have a baryon number of −1. Exotic hadrons like pentaquarks (four quarks, one antiquark) and tetraquarks (two quarks, two antiquarks) are also classified as baryons and mesons depending on their ...