LARGE O(M(C)(-2)) NONPERTURBATIVE CORRECTIONS TO THE INCLUSIVE RATE OF THE DECAY B-]X(S)GAMMA

It is shown that the inclusive rate of the rare weak radiative decays B --> X(s) gamma contains a series of nonperturbative corrections, who se 'short distance' scale is set by m(c)(-1), rather than by m(b)(-1). The first correction in this series is expressed through the chromoma gnetic interaction of the b quark inside the B meson and the relative magnitude of the effect is determined by the ratio [(B) over bar/(b) o ver bar sigma . Gb/B]/m(c)(2). Though the magnitude of this first corr ection is suppressed by a numerical coefficient, the sensitivity of th e decay rate to the distance scale m(c)(-1) may significantly limit th e accuracy of purely perturbative predictions for the rate. (C) 1997 P ublished by Elsevier Science B.V.