Search for Large Extra Spatial Dimensions in the Dimuon Channel

The D0 Collaboration

Contact Persons: Ryan Hooper, Greg Landsberg


In this analysis we report preliminary results on the search for large extra spatial dimensions using a two muon final state. The data set utilized represents 100 pb^-1 of data collected by the DZERO Experiment at the Fermilab Tevatron in 2002-2003 (Run II). This analysis uses the Tevatron's high energy proton anti-proton collisions in an attempt to create Kaluza-Klein gravitons. By analyzing the decay of these gravitons into two high momentum muons and looking for deviations from the Standard Model we can test for the effects of large extra dimensions. In this analysis we found no evidence for the existence of large extra dimensions, but we still proceed to set a lower limit on the fundamental Planck scale. Specifically we set a 95% confidence level limit on the fundamental Planck scale of 880 GeV (in the GRW convention). This lower limit is now the world's most stringent limit on large extra dimensions using the two muon final state.

A detailed description is available as DØ note 4230 (restricted access; non-D0-speakers, please contact the D0 NP Convenors).




Distributions of invariant dimuon mass vs. cos(theta*) for MC and data. MC is scaled by the integrated luminosity. The lower left plot shows SM plus contributions from the GKK terms with eta_G=3TeV-4.




Comparison of invariant dimuon mass distribution for data (points), backgrounds (filled histogram) and contributions expected in the presence of large extra dimensions (lines).




Comparison of cos(theta*) (left) and invariant dimuon mass (right) distribution for data (points) and backgrounds (filled histogram).




Comparison of distributions of several kinematic variables for data (points) and backgrounds (filled histogram).


Volker Buescher
Last modified: Wed Sep 3 07:21:08 CDT 2003