Impact parameters of B hadron decay

Impact parameter of semileptonic B hadron decay in proton collisions, with tau decay to three pions.

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% Author: Izaak Neutelings (October 2019)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath}
\usepackage{esvect} % \vv
\usepackage{tikz}
\usetikzlibrary{patterns,decorations.pathmorphing}
\tikzset{>=latex}
\usetikzlibrary{calc}
\usetikzlibrary{intersections}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{angles,quotes} % for pic
\newcommand\Bc{{\mathrm{B}}}
\newcommand\Jpsi{{\mathrm{J}\!/\!\psi}}
\newcommand{\tikzAngleOfLine}{\tikz@AngleOfLine}
  \def\tikz@AngleOfLine(#1)(#2)#3{%
  \pgfmathanglebetweenpoints{%
    \pgfpointanchor{#1}{center}}{%
    \pgfpointanchor{#2}{center}}
  \pgfmathsetmacro{#3}{\pgfmathresult}%
}
%\tikzstyle{mydashed}=[dash pattern=on 1.5pt off 1.5pt]
\colorlet{beamcol}{orange!40!yellow!95!black}
\colorlet{SVcol}{green!50!blue!80!white}
\colorlet{Bccol}{green!80!blue!90!black}
\colorlet{Jpsicol}{red!90!black}
\colorlet{taucol}{orange!95!black}
\colorlet{mygreen}{green!70!black}
\tikzset{
  ext/.style={shorten >=-#1,shorten <=-#1},
  ext/.default=1cm,
  smallarr/.style={{Latex[length={#1*4},width={#1*2.5}]}-{Latex[length={#1*4},width={#1*2.5}]}},
  smallarr/.default=1,
}
\begin{document}
% Bc -> J/psi tau nu
 
 
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