Polarized gluon distribution function of nucleon in diffractive lepto-production of charmonium

Details Polarized gluon distribution function of nucleon in diffractive lepto-production of charmonium Polarized gluon distribution function of nucleon in diffractive lepto-production of charmonium

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..472h&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 472-476 (2001).

Physics

Meson Production, Polarization In Interactions And Scattering, Perturbative Calculations

Scientific paper

We investigate the longitudinal double spin asymmetry in the diffractive lepto-production of charmonium off the proton, and clarify its relation to the polarized gluon distribution ΔG of the proton. The asymmetry is found to be finite even in the forward limit, if we properly deal with the Fermi motion of charm quarks and transverse momenta of the exchanged gluons. Our calculation for the photo-production of J/ψ indicates the asymmetry is of O(10-3)~O(10-2) at HERA collider energy and of O(10-2) at fixed-target energy (HERMES). The asymmetry for the ψ' is even large, of O(10-1), due to the large Fermi motion of cc in ψ'. .

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