Production Characteristics of Neutral and Charged D Mesons in 800 GEV P-Emulsion Interactions.
Abstract
New results from experiment 653 at FNAL are presented. Invariant mass distributions of neutral and charged D mesons in the exclusive decay mode of D^0 to Kpi and D^+/- to K^{pipi } are obtained using the information from the electronic portion of the spectrometer. A study of transverse momentum distribution of the background subtracted events shows good agreement with other experiments. The result of a maximum likelihood fit of the form dN/dP_sp {T}{2} = e^{ -bP_sp{T}{2}} to the data gives b = 1.29_sp{-.20} {+.22}(Gev/c)^{-2 } with < P_ T> = 840 +/- 95 Mev/c. The longitudinal momentum distribution, however, indicates a highly central production of charm particles at 800 Gev proton-nuclei collision. A maximum likelihood fit of the form dN/dx_{F} = (1 - x_{F}) ^{n} to our data gives n = 14-16. This is in contrast to the leading particle effects (n <= 4), where a valence quark from the incident particle 'leads' a charm quark from the sea resulting in a charmed particle with large longitudinal momentum. The total cross section for the charm sample was calculated to be sigma(D) = 102 _sp{-18}{+21} +/- 23 mu{b} with 32_sp{-8}{+9} +/- 11 mu{b}+ and 70_sp{-16}{+19 } +/- 20 mu {b} for the charged and neutral D mesons, respectively.
- Publication:
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Ph.D. Thesis
- Pub Date:
- 1988
- Bibcode:
- 1988PhDT.......159M
- Keywords:
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- Physics: Elementary Particles and High Energy