Measurement of correlatedbb¯production inpp¯collisions ats=1960GeV

We present a measurement of the correlated $b\overline{b}$ production cross section. The data used in this analysis were taken with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider, and correspond to an integrated luminosity of $742{\mathrm{pb}}^{-1}$. We utilize muon pairs with invariant mass $5\le m_{\mu \mu }\le 80\mathrm{GeV}/c^2$ produced by $b\overline{b}$ double semileptonic decays. For muons with $p_T\ge 3\mathrm{GeV}/c$ and $|\eta |\le 0.7$, that are produced by $b$ and $\overline{b}$ quarks with $p_T\ge 2\mathrm{GeV}/c$ and $|y|\le 1.3$, we measure ${\sigma }_{b\to \mu ,\overline{b}\to \mu }=1549\pm 133\mathrm{pb}$. We compare this result with theoretical predictions and previous measurements. We also report the measurement of ${\sigma }_{c\to \mu ,\overline{c}\to \mu }$, a by-product of the study of the background to $b\overline{b}$ production.