Effects of TeV scale gravity on e+e−→W+W−

We study the process e+e−→W+W− to probe low-scale gravity at high energy linear colliders. A characteristic signature of extra dimensions models is the forward–backward asymmetry due to the interference of spin-2 graviton and spin-1 SM gauge boson exchange terms, even when right-polarised electron beam is used. Our analysis shows that larger than 5% asymmetry is possible at a linear collider with s=500 (800) GeV if the mass scale, MS is smaller than 2.7 (4.5) TeV. W− polarisation factors measured with a few percent accuracy will also be able to put similar limits on MS.