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We analyze the potentiality of the new generation of $e^+e^-$ linearcolliders to search for large extra dimensions via the production of fermionpairs in association with Kaluza-Klein gravitons (G), i.e. $e^+e^- \leftarrowf\bar{f}G$. This process leads to a final state exhibiting a significant amountof missing energy in addition to acoplanar lepton or jet pairs. We study indetail this reaction using full tree level contibutions due to the gravitonemission and the standard model backgrounds. After choosing the cuts to enhancethe signal, we show that a linear collider with a center-of-mass energy of 500GeV will be able to probe quantum gravity scales from 0.96(0.86) up to 4.1(3.3)TeV at 2(5)$\sigma$ level, depending on the number of extra dimensions.Comment: 19 pages, 5 figures. Using RevTex, axodraw.sty. Discussion was  extended. No changes in the results. Accepted for publication by Phys. Rev.

Direct signals for large extra dimensions in the production of fermion pairs at linear colliders