title: Universal torsion-induced interaction from large extra dimensions
abstract: We consider the Kaluza-Klein (KK) scenario in which only gravity exists in the bulk. Without the assumption of symmetric connection, the presence of brane fermions induces torsion. The result is a universal axial contact interaction that dominates those induced by KK gravitons. This enhancement arises from a large spin density on the brane. Using a global fit to Z-pole observables, we find the 3sigma bound on the scale of quantum gravity to be 28 TeV for n = 2. If Dirac or light sterile neutrinos are present, the data from SN1987A increase the bound to sqrt[n] M(S)>/=210 TeV.
authors.affiliation: Institute for Particle Physics and Astrophysics, Physics Department, Virginia Tech, Blacksburg, Virginia 24061, USA.
authors.initials: LN
authors.lastname: Chang
authors.initials: O
authors.lastname: Lebedev
authors.initials: W
authors.lastname: Loinaz
authors.initials: T
authors.lastname: Takeuchi