Exploring Small Extra Dimensions at the Large Hadron Collider

Many models that include small extra space dimensions predict graviton stateswhich are well separated in mass, and which can be detected as resonances incollider experiments. It has been shown that the ATLAS detector at the LargeHadron Collider can identify such narrow states up to a mass of 2080 GeV in thedecay mode G->ee, using a conservative model. This work extends the study ofthe ee channel over the full accessible parameter space, and shows that thereach could extend as high as 3.5 TeV. It then discusses ways in which theexpected universal coupling of the resonance can be confirmed using other decaymodes. In particular, the mode G-> di-photons is shown to be measurable withgood precision, which would provide powerful confirmation of the gravitonhypothesis. The decays G-> mu mu, WW, ZZ and jet--jet are measurable over amore limited range of couplings and masses. Using information from mass andcross-section measurements, the underlying parameters can be extracted. In onetest model, the size of the extra dimension can be determined to a precision inlength of 7x10^-33 m.Comment: 23 pages, 13 figures. The horizontal hatching in figures 6 and 8 is only displayed correctly if anti-aliasing is turned of