Precise predictions for B→XSl+l- in the large q2 region

The inclusive B ->-> X(s)e(+)e- decay rate in the large q(2) region (q(2) > m(2),) receives significant nonperturbative corrections. The resulting V/ uncertainties can be drastically reduced by normalizing the rate to the B ->-> X, e 0 rate with the same q2 cut, which allows for much improved tests of short distance physics. We calculate this ratio, including the order 1/m(b)(3) nonperturbative corrections and the analytically known NNLO perturbative corrections. Since in the large q2 region an inclusive measurement may be feasible via a sum over exclusive states, our results could be useful for measurements at LHCb and possibly for studies of B X-d(e)e+-. (C) 2007 Elsevier B.V. All rights reserved.