B -meson production at forward and backward rapidity in p+p and Cu + Au collisions at sNN=200 GeV

Le résumé fourni par la source

The fraction of $J/\ensuremath{\psi}$ mesons which come from $B$-meson decay, ${\mathrm{F}}_{B\ensuremath{\rightarrow}J/\ensuremath{\psi}}$, is measured for $\mathrm{J}/\ensuremath{\psi}$ rapidity $1.2<|y|<2.2$ and ${p}_{T}>0$ in $p+p$ and Cu+Au collisions at $\sqrt{{s}_{{}_{NN}}}$ = 200 GeV with the PHENIX detector. The extracted fraction is ${\mathrm{F}}_{B\ensuremath{\rightarrow}J/\ensuremath{\psi}}=0.025\ifmmode\pm\else\textpm\fi{}0.006$ (stat) $\ifmmode\pm\else\textpm\fi{}$ 0.010(syst) for $p+p$ collisions. For Cu+Au collisions, ${\mathrm{F}}_{B\ensuremath{\rightarrow}J/\ensuremath{\psi}}$ is 0.094 $\ifmmode\pm\else\textpm\fi{}$ 0.028(stat) $\ifmmode\pm\else\textpm\fi{}$ 0.037(syst) in the Au-going direction ($\ensuremath{-}2.2<y<\ensuremath{-}1.2$) and 0.089 $\ifmmode\pm\else\textpm\fi{}$ 0.026(stat) $\ifmmode\pm\else\textpm\fi{}$ 0.040(syst) in the Cu-going direction ($1.2<y<2.2$). The nuclear modification factor, ${R}_{\mathrm{CuAu}}$, of $B$ mesons in Cu+Au collisions is consistent with binary scaling of measured yields in $p+p$ at both forward and backward rapidity.

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