M. Acciarri et al., Search for extra dimensions in boson and fermion pair production in e(+)e(-) interactions at LEP, PHYS LETT B, 470(1-4), 1999, pp. 281-288
Extra spatial dimensions are proposed by recent theories that postulate the
scale of gravity to be of the same order as the electroweak scale. A sizea
ble interaction between gravitons and Standard Model particles is then pred
icted. Effects of these new interactions in boson and fermion pair producti
on are searched for in the data sample collected at centre-of-mass energies
above the Z pole by the L3 detector at LEP. In addition, the direct produc
tion of a graviton associated with a Z boson is investigated. No statistica
lly significant hints for the existence of these effects are found and lowe
r limits in excess of 1 TeV are derived on the scale of this new theory of
gravity. (C) 1999 Published by Elsevier Science B.V. All rights reserved.