Wie kann ich in einem Kommando erzeugte Funktionswerte gruppieren?

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\documentclass[11pt, a4paper, ngerman]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage[ngerman]{babel}
 \parindent0pt 
\usepackage{amsmath}
\usepackage{calc}
\usepackage{tikz}
\newcommand{\xStrich}[1]{\bgroup
% Zeichenmaße messen  mit calc-Paket
%Höhe
\newlength{\Hoehe}
%\settototalheight{\Hoehe}{#1}
\settoheight{\Hoehe}{#1}
%Breite
\newlength{\Breite}
\settowidth{\Breite}{#1}
%
\mathord{
\begin{tikzpicture}[baseline=0ex, line width=0.5pt, scale=1] 
\draw[shorten <=0.0ex, shorten >=0.0ex] (-\Breite/2,\Hoehe/2) -- (\Breite/2,\Hoehe/2);
\end{tikzpicture}
}
\egroup}
\begin{document}
$\xStrich{a}$  $a$% GEHT
%$(\xStrich{a}, \xStrich{b})$  $(a,b)$ % GEHT NICHT!!!!!
\end{document}
 
 
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