Chapter 12: Q31E (page 557)
Sketch Feynman vertex for the annihilation of a b quark and .
Short Answer
The Feynman diagram is shown in the figure as follows:
Chapter 12: Q31E (page 557)
Sketch Feynman vertex for the annihilation of a b quark and .
The Feynman diagram is shown in the figure as follows:
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Get started for freeWhat does color neutrality have to do with quark confinement?
If a neutrino interacted with a quark every time their separation was within the range generally accepted for the weak force, then the cross-section of a neutron or proton “seen” by a neutrino would be on the order of . Even at such separation, however the probability of interactions is quite small. The nucleon appears to have an effective cross-section of only about .
(a) About how many nucleons are there in a column through the earth’s center of 1 m2 cross-sectional area?
(b) what is the probability that a given neutrino passing through space and encountering earth will actually “hit”?
Trying to pull two quarks apart would produce more quarks in groups or hadrons. Suppose that when the separation reaches 1 fm ( the approximate radius of a nucleon), the lightest hadron a is created.
(a) Roughly how much force is involved?
(b) Compare this with the electrostatic force between two fundamentalcharges the same distance apart. Does your results agree with the strengths in table 12.1 ?
In the following exercises, two protons are smashed together in an attempt to convert kinetic energy into mass and new particles. Indicate whether the proposed reaction is possible. If not, indicate which rules are violated. Consider only those for charge, angular momentum, and baryon number If the reaction is possible, calculate the minimum kinetic energy required of the colliding protons.
A lead nucleus at rest is roughly 10-14min diameter. If moving through the laboratory with a kinetic energy of 600 TeV, howthick would thenucleus be in the direction of motion?
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