Cross section for bb¯ production via dielectrons in d + Au collisions at sNN=200 GeV

Le résumé fourni par la source

We report a measurement of ${e}^{+}{e}^{\ensuremath{-}}$ pairs from semileptonic heavy-flavor decays in $d+\text{Au}$ collisions at $\sqrt{{s}_{{}_{NN}}}=200$ GeV. By exploring the mass and transverse-momentum dependence of the yield, the bottom decay contribution can be isolated from charm, and quantified by comparison to pythia and mc@nlo simulations. The resulting $b\overline{b}$-production cross section is ${\ensuremath{\sigma}}_{b\overline{b}}^{d\mathrm{Au}}=1.37\ifmmode\pm\else\textpm\fi{}0.28\phantom{\rule{4pt}{0ex}}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.46\phantom{\rule{4pt}{0ex}}(\mathrm{syst})$ mb, which is equivalent to a nucleon-nucleon cross section of ${\ensuremath{\sigma}}_{bb}^{NN}=3.4\ifmmode\pm\else\textpm\fi{}0.8\phantom{\rule{4pt}{0ex}}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.1\phantom{\rule{4pt}{0ex}}(\mathrm{syst})\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}b$.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.