Z boson decay

Decay of the Z boson to leptons.

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% Author: Izaak Neutelings (Februari 2023)
% Description: Decay of the Z boson to leptons.
\documentclass[border=3pt,tikz]{standalone}
\usetikzlibrary{calc}
\usetikzlibrary{math} % for \tikzmath
\usetikzlibrary{arrows.meta} % for arrow size
\usetikzlibrary{decorations.pathmorphing} % for snakes
\tikzset{>=latex} % for LaTeX arrow head
\colorlet{myred}{red!75!black}
\colorlet{myblue}{blue!70!black}
%\colorlet{mydarkblue}{blue!50!black}
\colorlet{mygreen}{green!60!black}
\colorlet{myorange}{orange!75!yellow!90!black}
\colorlet{isocol}{blue!70!black} % color isolation cone
\colorlet{sigcol}{red!90!black} % color isolation cone
\tikzstyle{track}=[->,line width=0.6,myred]
\tikzstyle{dashed track}=[->,mygreen,line width=0.6,line cap=round,
                          dash pattern=on 2.3 off 2.0]
\tikzstyle{part}=[circle,ball color=#1,text=#1!30!black,
                  postaction={fill=#1!77,fill opacity=0.8,
                  draw=#1!60!black!90,thin}]
\tikzstyle{mysmallarrow}=[-{Latex[length=4.2,width=3.5]},mygreen,thick]
% JET CONE
\newcommand\jetcone[6][sigcol]{{
  \pgfmathanglebetweenpoints{\pgfpointanchor{#2}{center}}{\pgfpointanchor{#3}{center}}
  \pgfmathsetmacro\oang{#4/2} % half-opening angle
  \edef\e{#5} % ratio a/b ("eccentricity") of cone top
  \def\tmpL{tmpL-#2-#3} % unique coordinate name
  \edef\vang{\pgfmathresult} % angle of vector OV
  \tikzmath{
    coordinate \C;
    \C = (#2)-(#3); % vector OV
    \x = veclen(\Cx,\Cy)*\e*sin(\oang)^2; % x coordinate P
    \y = tan(\oang)*(veclen(\Cx,\Cy)-\x); % y coordinate P
    \a = veclen(\Cx,\Cy)*sqrt(\e)*sin(\oang); % vertical radius
    \b = veclen(\Cx,\Cy)*tan(\oang)*sqrt(1-\e*sin(\oang)^2); % horizontal radius
    \angb = acos(sqrt(\e)*sin(\oang)); % angle of P in ellipse
  }
  \coordinate (\tmpL) at ($(#3)-(\vang:\x pt)+(\vang+90:\y pt)$); % tangency
 
 
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