Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-04-10
Phys.Rev. D57 (1998) 1838-1845
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, updated to include new results
Scientific paper
10.1103/PhysRevD.57.1838
The cross section between a $c \bar c$ pair and a nucleon is small and sensitive to the $c - \bar c$ separation if the pair is in a color-singlet state, but very large and insensitive to the separation if it is in a color-octet state. We use this property in an absorption model involving both color components to deduce the color structure of $c \bar c$ pairs produced in $p(B)A \to \psi X$ reactions. Our analysis shows that the NA3, NA38 and E772 data are not inconsistent with the theoretical picture that color-octet and color-singlet precursors are produced in roughly equal proportions if the produced color-singlet precursors are pointlike and transparent. However, if the color-singlet precursors are not transparent but have a cross section of a few mb, these data do show a definite preference for a larger fraction of color-singlet precursors. In either case, the color-octet fraction increases with $x_F$, approaching unity as $x_F$ becomes large.
Wong Cheuk-Yin
Wong Chun Wa
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