Back-to-back topology & track multiplicity

Illustration of a back-to-back event topology of two τ leptons (to define acoplanarity or azimuthal separation Δφ in the transverse plane), and multiplicity of pileup (PU) and hard scattering (HS) tracks in a small window along the beam axis (z). Made for this CMS paper on the measurement of the γγ → ττ process in proton-proton collisions and the measurement of the anomalous magnetic moment of the τ lepton (g-2).

Edit and compile if you like:

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% Author: Izaak Neutelings (Februari 2024)
% Description: Event topology of two taus.
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath}
%\usetikzlibrary{calc}
%\usetikzlibrary{decorations.pathmorphing} % for snakes
\usetikzlibrary {shapes.geometric} % for star
\usetikzlibrary{bending} % for arrow head angle
\usetikzlibrary{angles,quotes} % for pic (angle labels)
\usetikzlibrary{arrows.meta} % for arrow size
% COLORS
\colorlet{myred}{red!75!black}
\colorlet{myblue}{blue!70!black}
%\colorlet{mydarkblue}{blue!50!black}
%\colorlet{mygreen}{green!60!black}
\colorlet{myorange}{orange!70!yellow!90!black}
% STYLES
\tikzset{
  >=latex, % for LaTeX arrow head
  pv/.style={myorange!70!red,fill=myorange!60!yellow,line width=0.3,star,star points=7,
             star point height=8pt,minimum size=2pt,draw,scale=0.3*#1},
  pv/.default=1,
  track/.style={-{Latex[scale=0.7]},line width=0.6,myorange!40,line cap=round},
  lepton/.style={track,->,line width=0.9,myred},
  %dashed track/.style={->,mygreen,line width=0.6,line cap=round,
  %                     dash pattern=on 2.3 off 2.0},
  %part/.style={circle,ball color=#1,text=#1!30!black,
  %             postaction={fill=#1!77,fill opacity=0.8,
  %             draw=#1!60!black!90,thin}]},
  %mysmallarrow/.style={-{Latex[length=4.2,width=3.5]},mygreen,thick},
  angarr/.style={{Latex[flex'=1,length=3.2,width=2.8]}-{Latex[flex'=1,length=3.2,width=2.8]}},
}
\begin{document}
% DITAU (exclusive signal for g-2)
\begin{tikzpicture}
 
 
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