出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We calculate the cross section of inclusive direct J/y photoproduction at next-to-leading order within the factorization formalism of nonrelativistic quantum chromodynamics, for the first time including the full relativistic corrections due to the intermediate 1S[8] 0 , 3S[8] 1 , and 3P[8] J color-octet states. A comparison of our results to recent H1 data suggests that the color octet mechanism is indeed realized in J/y photoproduction, although the predictivity of our results still suffers from uncertainties in the color-octet long-distance matrix elements.
