Bdtyktl

So I would like to be able to draw Wick contraction with Dirac bracket, the Dirac bracket is produced with package physics, and the mwe is

documentclass{article}



usepackage{physics}



begin{document}

$$

mathcal{M}_{hat{s}} sim mel**{k , k'}{overline{psi}_x psi _x overline{psi}_y psi _y}{p , p'}

$$

end{document}

The kind of effect I would like to achieve with this bracket is

The reason why I would like to use this package physics is, it is the only package I know that would nicely adjust the height of the angled bracket as well as the vertical lines in Dirac bracket, so I would like to stay with this package.

The problem with drawing the Wick contractions is, neither simplewick nor simpler-wick would work, so I am wondering if there is really a solution.

Also, I know it is always possible to do anything with tikz and that is something I could do, but I would appreciate if someone could offer a neater solution.

A solution with pstricks . I also defined a Dirac braket with DeclarePairedDelimiter from mathtools:

documentclass[svgnames]{article}

usepackage{mathtools}

usepackage{pst-node, auto-pst-pdf}



DeclarePairedDelimiterXDirbraket[3]{langle}{rangle}%

{#1,delimsizevert,mathopen{}#2,delimsizevert,mathopen{}#3}



begin{document}



begin{postscript}

[

  mathcal{M}_{hat{s}} sim Dirbraket*{rnode{k}{k} , rnode{k1}{k'}}{rnode{opx}{overline{psi}_x rnode{psx}{psi_x}} rnode{opy}{overline{psi}_y} rnode{psy}{psi_y}}{rnode{p}{vphantom{k} p} , rnode{p1}{p'}}

]

psset{angle=90, linewidth=0.5pt, linecolor=IndianRed, nodesep=2pt, arm=3mm, linejoin=1}

ncbar[offsetB=-8pt]{k}{opx}

ncbar[arm=2mm]{k1}{psy}

ncbar[offsetA=2pt]{opy}{p1}

ncbar[offsetA=1pt, arm=4.5mm]{psx}{p}

end{postscript}



end{document}

langle and rangle will scale and work with simpler-wick:

documentclass{article}



usepackage{simpler-wick}



begin{document}

[

mathcal{M}_{hat{s}} sim 

langle

 wick{

        c1 k, c2 k'

        vert

        overline{c1 psi}_x psi_x overline{psi}_y c2 psi_y

        vert

        p, p'

  }

rangle

]

end{document}