Atomic mass dependence of D± and D0,D¯ 0 production in 250 GeV π±-nucleon interactions
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ID: 268579
1993
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Abstract
We measure the relative cross sections for D mesons produced in interactions of ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$ and ${\mathrm{\ensuremath{\pi}}}^{+}$ beams with targets of Be, Cu, Al, and W. The measurement is based on 1400 fully reconstructed decays of the types ${\mathit{D}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{+}$, ${\mathit{D}}^{+}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{+}$, and charge conjugates. We find that the cross section for the production of both neutral and charged D's by either ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$ or ${\mathrm{\ensuremath{\pi}}}^{+}$ is well fitted by the form ${\mathit{A}}^{\mathrm{\ensuremath{\alpha}}}$ where A is the atomic mass and \ensuremath{\alpha}=1.00\ifmmode\pm\else\textpm\fi{}0.05\ifmmode\pm\else\textpm\fi{}0.02, where the errors are statistical and systematic, respectively. There is no significant dependence of \ensuremath{\alpha} on the transverse or longitudinal momentum of the D meson or on the charge of either the incident pion or the produced D mesons.
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1993physicalatomic
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| Journal | physical review letters |
| Year | 1993 |
| DOI |
doi:10.1103/PhysRevLett.70.722
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