DISASTER++ (Version 1.0)

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DISASTER++ is a C++ class library for the calculation of (1+1) and (2+1)-jet-like quantities in deeply inelastic lepton-nucleon scattering for one-photon exchange in next-to-leading-order QCD perturbation theory. The calculation is based on the subtraction formalism. The user has access to an event record such that an arbitrary set of infrared-safe observables can be calculated in a single run. Compared to other existing universal programs, the full dependence on the number of flavours and on the renormalization and factorization scales is made explicit. An interface class providing a simple interface from C++ to existing FORTRAN programs is available. In a preliminary study DISASTER++ is compared to two other programs for various bins of the lepton variables xB and y, where a particular emphasis is put on different behaviours for ξ→ 1 of the parton densities f(ξ). We find good agreement of DISASTER++ and DISENT (Version 0.1). The comparison of DISASTER++ and MEPJET (Version 2.0) leads to several discrepancies.