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Resummation of large endpoint corrections to color-octet<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>photoproduction
An unresolved problem in $J/\ensuremath{\psi}$ phenomenology is a systematic understanding of the differential photoproduction cross section, $d\ensuremath{\sigma}/dz[\ensuremath{\gamma}+p\ensuremath{\rightarrow}J/\ensuremath{\psi}+X$], where $z={E}_{\ensuremath{\psi}}/{E}_{\ensuremath{\gamma}}$ in the proton rest frame. In the nonrelativistic QCD (NRQCD) factorization formalism, fixed-order perturbative calculations of color-octet mechanisms suffer from large perturbative and nonperturbative corrections that grow rapidly in the endpoint …