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- W2228931633 abstract "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′." @default.
- W2228931633 created "2016-06-24" @default.
- W2228931633 creator A5011468534 @default.
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- W2228931633 date "2001-01-01" @default.
- W2228931633 modified "2023-10-02" @default.
- W2228931633 title "Polarized gluon distribution function of nucleon in diffractive lepto-production of charmonium" @default.
- W2228931633 doi "https://doi.org/10.1063/1.1384104" @default.
- W2228931633 hasPublicationYear "2001" @default.
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