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The measurement of electrons from semi-leptonic decay of heavy flavor in$p+p$ collisions at $\sqrt{s}$=200 GeV has been carried out with the PHENIXdetector in the RHIC Year-2005 and Year-2006 run. This measurement provides agood test of the perturbative QCD and the important base line to study themedium created in Au+Au collisions at RHIC. The behavior of bottom in themedium is expected to be largely different from that of charm. Therefore, thedetermination of the fraction of bottom in the electrons from heavy flavor isnecessary to understand the behavior of heavy quarks in the matter.  The first separate measurement of charm and bottom via partial reconstructionof $D/\bar{D} \to e^{\pm} K^{\mp} X$ decay has been carried out in $p+p$collisions. It is found that there is the considerable contribution from bottomin the electrons from heavy flavor above 3 GeV/$c$. The total cross section ofbottom is also determined to $\sigma_{b\bar{b}}= 3.2 ^{+1.2}_{-1.1}(stat){}^{+1.4}_{-1.3}(sys) \mu b$. It is found that the perturbative QCD predictionsof charm and bottom production are consistent with the measurement of charm andbottom at PHENIX. In addition, this result indicates the not only charm butalso bottom quarks lose a large fraction of their energy in the medium.

Production of charm and bottom quarks in $p+p$ collisions at 200GeV