Search for Large Extra Spatial Dimensions in Dimuon Production with the D0 Detector

We present the results of a search for the effects of large extra spatial dimensions in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ in events containing a pair of energetic muons. The data correspond to $246{\mathrm{pb}}^{-1}$ of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider. Good agreement with the expected background was found, yielding no evidence for large extra dimensions. We set 95% C.L. lower limits on the fundamental Planck scale between 0.85 and 1.27 TeV within several formalisms. These are the most stringent limits achieved in the dimuon channel to date.

Figure 1

Comparison of data (circles with error bars) and SM predictions (histogram) in $p_T$, ${\eta }_d$, and $\varphi$ [12] of the muons in the event. The dips in the azimuthal angle reflect detector acceptance.

Figure 2

Two-dimensional distributions in the dimuon mass vs $|\cos {\theta }^{*}|$ for (a) SM background, (b) the sum of the SM and large extra dimensions contributions for ${\eta }_G=3{\mathrm{TeV}}^{-4}$, and (c) data.

Figure 3

Comparison between data and SM background in the dimuon mass $M$, where the effects of extra dimensions are enhanced and shown for ${\eta }_G=1$ and $3{\mathrm{TeV}}^{-4}$ (dashed lines).