mjhjmtu

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

documentclassarticle

usepackagephysics

begindocument
$$
mathcalM_hats sim mel**k , k'overlinepsi_x psi _x overlinepsi_y psi _yp , p'
$$
enddocument

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
usepackagemathtools
usepackagepst-node, auto-pst-pdf

DeclarePairedDelimiterXDirbraket[3]langlerangle%
#1,delimsizevert,mathopen#2,delimsizevert,mathopen#3

begindocument

beginpostscript
[
 mathcalM_hats sim Dirbraket*rnodekk , rnodek1k'rnodeopxoverlinepsi_x rnodepsxpsi_x rnodeopyoverlinepsi_y rnodepsypsi_yrnodepvphantomk p , rnodep1p'
]
pssetangle=90, linewidth=0.5pt, linecolor=IndianRed, nodesep=2pt, arm=3mm, linejoin=1
ncbar[offsetB=-8pt]kopx
ncbar[arm=2mm]k1psy
ncbar[offsetA=2pt]opyp1
ncbar[offsetA=1pt, arm=4.5mm]psxp
endpostscript

enddocument

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

documentclassarticle

usepackagesimpler-wick

begindocument
[
mathcalM_hats sim 
langle
 wick
 c1 k, c2 k'
 vert
 overlinec1 psi_x psi_x overlinepsi_y c2 psi_y
 vert
 p, p'
 
rangle
]
enddocument