We report on a measurement of the Upsilon(1S+2S+3S) -> e+e- cross section at
midrapidity in p+p collisions at sqrt(s)=200 GeV. We find the cross section to
be 114 +/- 38 (stat.) +23,-24 (syst.) pb. Perturbative QCD calculations at
next-to-leading order in the Color Evaporation Model are in agreement with our
measurement, while calculations in the Color Singlet Model underestimate it.
Our result is consistent with the trend seen in world data as a function of the
center-of-mass energy of the collision and extends the availability of Upsilon
data to RHIC energies. The dielectron continuum in the invariant mass range
near the Upsilon is also studied to obtain a combined cross section of
Drell-Yan plus (b b-bar) -> e+e-.
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