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Ghost contributions to charmonium production in polarized high-energy collisions

Abstract : In a previous paper [Phys. Rev. D 68, 034017 (2003)], we investigated the inclusive production of prompt J/psi mesons in polarized hadron-hadron, photon-hadron, and photon-photon collisions in the factorization formalism of nonrelativistic quantum chromodynamics providing compact analytic results for the double longitudinal-spin asymmetry A_{LL}. For convenience, we adopted a simplified expression for the tensor product of the gluon polarization four-vector with its charge conjugate, at the expense of allowing for ghost and anti-ghosts to appear as external particles. While such ghost contributions cancel in the cross section asymmetry A_{LL} and thus were not listed in our previous paper, they do contribute to the absolute cross sections. For completeness and the reader's convenience, they are provided in this addendum.
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http://hal.in2p3.fr/in2p3-00259168
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, February 27, 2008 - 8:59:37 AM
Last modification on : Monday, July 20, 2020 - 9:18:24 AM

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M. Klasen, B. A. Kniehl, L. N. Mihaila, M. Steinhauser. Ghost contributions to charmonium production in polarized high-energy collisions. Physical Review D, American Physical Society, 2008, 77, pp.117501. ⟨10.1103/PhysRevD.77.117501⟩. ⟨in2p3-00259168⟩

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