Abstract
The dimensionally regularized massless double box Feynman diagram with powers of propagators equal to one, one leg off the mass shell, i.e. with nonzero q 2= p 1 2, and three legs on shell, p i 2=0, i=2,3,4 , is analytically calculated for general values of q 2 and the Mandelstam variables s and t. An explicit result is expressed through (generalized) polylogarithms, up to the fourth order, dependent on rational combinations of q 2, s and t, and a one-dimensional integral with a simple integrand consisting of logarithms and dilogarithms.
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