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66 lines
2.1 KiB
TeX
66 lines
2.1 KiB
TeX
\RequirePackage{luatex85}
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\documentclass[tikz]{standalone}
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\usepackage[compat=1.1.0]{tikz-feynman}
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\begin{document}
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\feynmandiagram [horizontal=a to b] {
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i1 -- [fermion] a -- [fermion] i2,
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a -- [photon] b,
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f1 -- [fermion] b -- [fermion] f2,
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};
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\feynmandiagram [horizontal=a to b] {
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i1 [particle=\(e^{-}\)] -- [fermion] a -- [fermion] i2 [particle=\(e^{+}\)],
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a -- [photon, edge label=\(\gamma\), momentum'=\(k\)] b,
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f1 [particle=\(\mu^{+}\)] -- [fermion] b -- [fermion] f2 [particle=\(\mu^{-}\)],
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};
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\feynmandiagram [large, vertical=e to f] {
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a -- [fermion] b -- [photon, momentum=\(k\)] c -- [fermion] d,
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b -- [fermion, momentum'=\(p_{1}\)] e -- [fermion, momentum'=\(p_{2}\)] c,
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e -- [gluon] f,
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h -- [fermion] f -- [fermion] i,
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};
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\begin{tikzpicture}
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\begin{feynman}
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\vertex (a1) {\(\overline b\)};
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\vertex[right=1cm of a1] (a2);
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\vertex[right=1cm of a2] (a3);
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\vertex[right=1cm of a3] (a4) {\(b\)};
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\vertex[right=1cm of a4] (a5);
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\vertex[right=2cm of a5] (a6) {\(u\)};
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\vertex[below=2em of a1] (b1) {\(d\)};
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\vertex[right=1cm of b1] (b2);
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\vertex[right=1cm of b2] (b3);
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\vertex[right=1cm of b3] (b4) {\(\overline d\)};
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\vertex[below=2em of a6] (b5) {\(\overline d\)};
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\vertex[above=of a6] (c1) {\(\overline u\)};
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\vertex[above=2em of c1] (c3) {\(d\)};
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\vertex at ($(c1)!0.5!(c3) - (1cm, 0)$) (c2);
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\diagram* {
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{[edges=fermion]
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(b1) -- (b2) -- (a2) -- (a1),
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(b5) -- (b4) -- (b3) -- (a3) -- (a4) -- (a5) -- (a6),
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},
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(a2) -- [boson, edge label=\(W\)] (a3),
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(b2) -- [boson, edge label'=\(W\)] (b3),
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(c1) -- [fermion, out=180, in=-45] (c2) -- [fermion, out=45, in=180] (c3),
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(a5) -- [boson, bend left, edge label=\(W^{-}\)] (c2),
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};
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\draw [decoration={brace}, decorate] (b1.south west) -- (a1.north west)
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node [pos=0.5, left] {\(B^{0}\)};
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\draw [decoration={brace}, decorate] (c3.north east) -- (c1.south east)
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node [pos=0.5, right] {\(\pi^{-}\)};
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\draw [decoration={brace}, decorate] (a6.north east) -- (b5.south east)
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node [pos=0.5, right] {\(\pi^{+}\)};
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\end{feynman}
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\end{tikzpicture}
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\end{document}
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