What does the Z boson do?
Z bosons are the particles that mediate the weak nuclear force, and they can decay into any of the known quarks and leptons except for the top quark.
How do I know if I have a W+ or a boson?
The main difference is that the W+ has +1 charge, the W- has -1 charge, and the Z has 0 charge, and that the Z has a mass that is about 14% greater than the W+ and W-.
What does the Z boson couple to?
The Z boson is a heavy particle that is one of the carriers of the weak force. It is a partner of the W+ and W- bosons that mediate radioactive decay processes.
How was Z boson discovered?
Discovered in 1983 by physicists at the Super Proton Synchrotron at CERN, the Z boson is a neutral elementary particle. Like its electrically charged cousin, the W, the Z boson carries the weak force.
What is the difference between the W and Z bosons?
The two (charged) W bosons each have a mass of about 80 GeV/c2 whereas the (neutral) Z boson has a mass of about 90 GeV/c2. In weak interactions, W and Z bosons interact with each other, as well as with all quarks and leptons. The Universe would be an impossibly boring place without them.
Where do W and Z bosons come from?
Creation of W and Z bosons. W and Z bosons are only known to be created under Beta decay, which is a form of radioactive decay.
What are Feynman diagrams?
Feynman diagrams are in common use in particle physics. The value of these diagrams is to facilitate the calculation of interactions between particles. The introduction of these diagrams contributed to the theory of QED, first introduced by Dirac.
How to calculate normalization of a Feynman diagram?
To establish the normalization Z0 = exp W[0] = 1 one simply calculates all connected vacuum diagrams, i.e., the diagrams without any sources J (sometimes referred to as external legs of a Feynman diagram).
What is correlation in Feynman diagram?
Correlation functions are the sum of the connected Feynman diagrams, but the formalism treats the connected and disconnected diagrams differently. Internal lines end on vertices, while external lines go off to insertions. Introducing sources unifies the formalism, by making new vertices where one line can end.
What are the time axis and space axis in Feynman diagram?
In these diagrams, the time axis is vertical and the space portion of the interaction is represented schematically in one dimension along the horizontal axis. Figure 1.1 shows a set of two simplified Feynman diagrams of the emission and absorption processes.