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The cross section between a c\bar c object and a nucleon is small if the object is in a color-singlet state, but very large and insensitive to its size if it is in a color-octet state. We use this property to estimate the fraction of c\bar c color-octet states formed after the initial hard-scattering processes by studying the effective J/\psi absorption in a nucleus. The experimental NA3 and E772 data of pA \rightarrow \psi X reveal the presence of anomalously large effective absorption of J/\psi at large x_F, which indicates a large color-octet fraction in J/\psi production at large x_F

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Color-octet fraction in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>production and absorption

Color-octet fraction inJ/ψproduction and absorption