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The momentum distribution of electrons from semi-leptonic decays of charm andbottom for mid-rapidity |y|<0.35 in p+p collisions at sqrt(s)=200 GeV ismeasured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC)over the transverse momentum range 2 < p_T < 7 GeV/c. The ratio of the yield ofelectrons from bottom to that from charm is presented. The ratio is determinedusing partial D/D^bar --> e^{+/-} K^{-/+} X (K unidentified) reconstruction. Itis found that the yield of electrons from bottom becomes significant above 4GeV/c in p_T. A fixed-order-plus-next-to-leading-log (FONLL) perturbativequantum chromodynamics (pQCD) calculation agrees with the data within thetheoretical and experimental uncertainties. The extracted total bottomproduction cross section at this energy is \sigma_{b\b^bar}= 3.2^{+1.2}_{-1.1}(stat) ^{+1.4}_{-1.3}(syst) micro b.

Measurement of Bottom versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations in p+p Collisions at sqrt(s)=200 GeV