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The numerical value of a universal quantity associated with the quantumcritical regime, namely $\chi_u c^2/T$, for a two-dimensional (2D) dimerizedspin-1/2 antiferromagnet is calculated using the quantum Monte Carlosimulations (QMC). Here $\chi_u$, $c$, and $T$ are the uniform susceptibility,the spin-wave velocity, and the temperature, respectively. By simulating largelattices at moderately low temperatures, we find $\chi_u c^2/T \sim 0.32$. Ourestimation of $\chi_u c^2/T$ deviates from the related analytic prediction butagrees with recent numerical calculations of other 2D dimerized spin-1/2antiferromagnets.

The numerical value for a universal quantity of a two-dimensional dimerized quantum antiferromagnet