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Chapter 39: Problem 3
Which of the following formed latest in the universe? a) quarks b) protons and neutrons c) hydrogen atoms d) helium nuclei e) gluons
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If a neutrino beam of \(300 .\) GeV energy is passed through a 1.00 -cm-thick sheet of aluminum, how much of the beam is attenuated, if the cross section of interactions is given by \(\sigma(E)=\left(1.00 \cdot 10^{-38} \mathrm{~cm}^{2} \mathrm{GeV}^{-1}\right) E ?\)
The text describes and sketches the basic Feynman diagram for the fundamental process involved in the decay of the free neutron: One of the neutron's \(d\) -quarks converts to a \(u\) -quark, emitting a virtual \(W^{-}\) boson, which decays into an electron and an electron anti-neutrino (the only decay energetically possible). Similarly describe and sketch the basic (tree-level) Feynman diagram for the fundamental process involved in each of the following decays: a) \(\mu^{-} \rightarrow e^{-}+\nu_{\mu}+\bar{\nu}_{e}\) b) \(\tau^{-} \rightarrow \pi^{-}+\nu_{\tau}\) c) \(\Delta^{++} \rightarrow p+\pi^{+}\) d) \(K^{+} \rightarrow \mu^{+}+\nu_{\mu}\) e) \(\Lambda \rightarrow p+\pi\)
A proton is made of 2 up quarks and a down quark (uud). Calculate its charge.
Draw a Feynman diagram for an electron-proton scattering, \(e^{-}+p \rightarrow e^{-}+p\), mediated by photon exchange.
A photon can interact with matter by producing a proton-antiproton pair. What is the minimum energy the photon must have?
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