Search for Branons at LEP

L3 COLLABORATION, P. ACHARD, M.T. DOVA ET AL

PHYSICS LETTERS B

ELSEVIER

Año: 2004 vol. 597 p. 145 - 154

0370-2693

We search, in the context of extra-dimension scenarios, for the possible existence of brane fluctuations, called branons. Events with a single photon or a single Z-boson and missing energy and momentum collected with the L3 detector in e^+ e^- collisions at centre-of-mass energies sqrt{s}=189-209$ GeV are analysed. No excess over the Standard Model expectations is found and a lower limit at 95% confidence level of 103 GeV is derived for the mass of branons, for a scenario with small brane tensions. Alternatively, under the assumption of a light branon, brane tensions below 180 GeV are excluded.