  Antisymmetric tensor fields are a compelling prediction of string theory.
This makes them an interesting target for particle physics because
antisymmetric tensors may couple to electromagnetic dipole moments, thus
opening a possible discovery opportunity for string theory. The strongest
constraints on electromagnetic dipole couplings would arise from couplings to
electrons, where these couplings would contribute to Moller and Bhabha
scattering. Previous measurements of Bhabha scattering constrain the couplings
to $\tilde{M}_e m_C>7.1\times 10^4\,\mathrm{GeV}^2$, where $m_C$ is the mass of
the antisymmetric tensor field and $\tilde{M}_e$ is an effective mass scale
appearing in the electromagnetic dipole coupling.
