\documentclass{standalone} \usepackage{unicode-math} \setmathfont[Ligatures=TeX]{TeX Gyre Termes Math}%%% Using Times (more realistically: a Times' clone) is a must. %\setmathfont[Ligatures=TeX]{CambriaMath.ttf}%%% Not Times, but is not better anyway \begin{document} \(\langle \alpha,a\rangle\) \end{document}
The result given by xelatex or lualatex, is, erm, no better than in Arbab's paper:
Is there any Times' clone as TTF or OTF that provides a better distinction between the two symbols?