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Nuclear dependence of neutral- D -meson production by 800 GeV/ c protons

1994; American Physical Society; Volume: 72; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.72.2542

1092-0145

M. J. Leitch, J. G. Boissevain, T. A. Carey, D.M. Jansen, R. G. Jeppesen, J.S. Kapustinsky, D.W. Lane, J. W. Lillberg, P. L. McGaughey, J. M. Moss, J. C. Peng, L. Isenhower, M. E. Sadler, R. Schnathorst, G. Gidal, Pei-Ming Ho, M. S. Kowitt, K. B. Luk, D. Pripstein, L. M. Lederman, M. H. Schub, C. N. Brown, W. E. Cooper, H.D. Glass, Krishnaswamy Gounder, C. S. Mishra, D. M. Kaplan, W. Luebke, V. Martin, R. S. Preston, J. Sa, V. Tanikella, R. Childers, C.W. Darden, J. R. Wilson, Y. C. Chen, G. C. Kiang, P. K. Teng,

Nuclear reactor physics and engineering

The nuclear dependence for 800 GeV/c proton production of neutron D mesons has been measured near ${\mathit{x}}_{\mathit{F}}$=0 in Experiment 789 at Fermilab. D mesons from beryllium and gold targets were detected with a pair spectrometer and a silicon vertex detector via their decay D\ensuremath{\rightarrow}K\ensuremath{\pi}. No nuclear dependence is found, with a measured \ensuremath{\alpha}=1.02\ifmmode\pm\else\textpm\fi{}0.03\ifmmode\pm\else\textpm\fi{}0.02. The measured differential cross section, d\ensuremath{\sigma}/${\mathit{dx}}_{\mathit{F}}$, for neutral-D-meson production at 〈${\mathit{x}}_{\mathit{F}}$〉=0.031 is 58\ifmmode\pm\else\textpm\fi{}3\ifmmode\pm\else\textpm\fi{}7 \ensuremath{\mu}b/nucleon. The integrated cross section obtained by extrapolation of the measured cross section to all ${\mathit{x}}_{\mathit{F}}$ is 17.7\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}3.4 \ensuremath{\mu}b/nucleon and is consistent with previous measurements.