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We present observations with the INTEGRAL/IBIS telescope of the wind nebulapowered by the young pulsar B1509-58 and we discuss the spatial and spectralproperties of the unpulsed emission in the 20-200 keV energy band. The sourceextension and orientation along the northwest-southeast axis corresponds to thejet emission seen at keV and TeV energies. The hard X-ray spectrum isconsistent with the earlier Beppo-SAX measurements. It follows a power law witha photon index alpha = -2.12 pm 0.05 up to 160 keV. A possible break at thisenergy is found at the 2.9 sigma confidence level. The 0.1-100 keV data areconsistent with synchrotron aging of pairs in the jet and yield a magneticfield strength of 22-33 muG for a bulk velocity of 0.3-0.5c. The synchrotroncut-off energy thus corresponds to a maximum electron energy of 400-730 TeV.Comment: 4 pages, 6 figures, accepted for publication in Ap

High-Energy Particles in the Wind Nebula of Pulsar B1509-58 as Seen byINTEGRAL