A search for the decay mu -> e gamma, performed at PSI and

based on data from the initial three months of operation of the MEG

experiment, yields an upper limit

BR(mu -> e gamma) < 2.8 x 10**-11 (90% C.L.).

Positrons and photons from ~ 10**14 stopped mu-decays

were measured by a superconducting positron spectrometer and a

900 litre liquid xenon photon detector.