Total Forward and Differential Cross Sections of Neutral D Mesons Produced in 500 GeV / c π − – Nucleon Interactions

نویسندگان

  • J. C. Anjos
  • D. Ashery
  • S. B. Bracker
  • P. R. Burchat
  • R. A. Burnstein
  • H. S. Carvalho
  • L. M. Cremaldi
  • K. Denisenko
  • A. M. Halling
  • D. C. Langs
  • K. C. Peng
  • L. P. Perera
  • M. V. Purohit
  • J. J. Reidy
  • A. C. dos Reis
  • H. A. Rubin
  • D. A. Sanders
  • A. K. S. Santha
  • A. F. S. Santoro
  • R. A. Sidwell
  • M. D. Sokoloff
  • R. J. Stefanski
  • K. Stenson
  • A. K. Tripathi
چکیده

We measure the neutral D total forward cross section and the differential cross sections as functions of Feynman-x (xF ) and transverse momentum squared for 500 GeV/c π–nucleon interactions. The results are obtained from 88 990±460 reconstructed neutral D mesons from Fermilab experiment E791 using the decay channels D →K−π+ and D →K−π+π−π+ (and charge conjugates). We extract fit parameters from the differential cross sections and provide the first direct measurement of the turnover point in the xF distribution, 0.0131±0.0038. We measure an absolute D+D 0 (xF>0) cross section of 15.4 − + 2.3 1.8 μbarns/nucleon (assuming a linear A dependence). The differential and total forward cross sections are compared to theoretical predictions and to results of previous experiments.

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Total Forward and Diierential Cross Sections of Neutral D Mesons Produced in 500 Gev/c ? {nucleon Interactions Fermilab E791 Collaboration

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تاریخ انتشار 1999