[MRI-P-030701]{}\
[IC/2003/53]{}\
hep-ph/0307117\

[**Bhabha Scattering with Radiated Gravitons at Linear Colliders**]{}\
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  $^a$ The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy.
   E-mail: [Sukanta.Dutta@cern.ch]{}
  $^b$Harish-Chandra Research Institute, Chhatnag Road, Allahabad 211019, India.
   E-mail: [konar@mri.ernet.in, biswarup@mri.ernet.in]{}
  $^c$Department of Physics, Indian Institute of Technology, Kanpur 208016, India.
   E-mail: [sreerup@iitk.ac.in]{}
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> We study the process $e^+  e^- \to e^+ e^-  \not{\!\!E}$ at a high-energy $e^+ e^-$ collider, where the missing energy arises from the radiation of Kaluza-Klein gravitons in a model with large extra dimensions. It is shown that at a high-energy linear collider, this process can not only confirm the signature of such theories but can also sometimes be comparable in effectiveness to the commonly discussed channel $e^+ e^- \to  \gamma  \not{\!\!E}$, especially for a large number of extra dimensions and with polarized beams. We also suggest some ways of distinguishing the signals of a graviton tower from other types of new physics signals by combining data on our suggested channel with those on the photon-graviton channel.

1 cm

PACS No. 04.50.+h, 11.10.Kk, 11.25.Mj, 12.60.-i, 13.88.+e

Introduction
============

It is a matter of common belief in the high-energy physics community that there must be physics beyond the Standard Model 