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Definitions (93)
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weak interaction
The interaction responsible for all processes in which flavor changes, hence for the instability of heavy quarks and leptons, and particles that contain them. Weak interactions that do not change flav [..]
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virtual particle
A particle that exists only for an extremely brief instant as an intermediary in a process. The intermediate or virtual particle stages of a process cannot be directly observed. If they were observed, [..]
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up quark
The least massive flavor of quark, with electric charge 2/3.
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Track
The record of the path of a particle traversing a detector.
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Tracking
The reconstruction of a ``track'' left in a detector by the passage of a particle through the detector.
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uncertainty principle
The quantum principle, first formulated by Heisenberg, that states that it is not possible to know exactly both the position x and the momentum p of an object at the same time. x p . It can be writt [..]
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top quark
The sixth flavor of quark (in order of increasing mass), with electric charge 2/3. Its mass is much greater than any other quark or lepton.
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Synchrotron
A type of circular accelerator in which the particles travel in synchronized bunches at fixed radius.
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tau lepton
The third flavor of charged lepton (in order of increasing mass), with electric charge -1.
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strange quark
The third flavor of quark (in order of increasing mass), with electric charge -1/3.
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