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The calculation of NLO QCD corrections to the production cross section of twobottom pairs at the LHC is briefly summarized. We describe the pp -> b anti-b banti-b+X process both in the 4-flavor and 5-flavor scheme and investigate theeffect of the finite bottom quark mass. The results for the total cross sectionand a few differential distributions are presented. They have been obtainedwith the Nagy-Soper subtraction formalism for real radiation at NLO. Acomparison with results based on the traditional Catani-Seymour subtraction isalso included.

NLO mass effects in b anti-b b anti-b production at the LHC