Kazutaka Sudoh

Λc+ production in polarized pp scattering and polarized gluon distribution

Abstract To extract information about the polarized gluon distribution, ΔG ( x , Q 2 ), in the nucleons, we propose Λ c + productions in polarized pp scattering, p+ p → → Λ → c + +X , which will be observed at RHIC experiment starting soon. For this process, we have calculated the spin correlation differential cross section, dΔσ / dp T , and the spin correlation asymmetry defined by A LL ≡[ dΔσ / dp T ]/[ dσ / dp T ]. We have found that the A LL is sensitive to the polarized gluon distribution in the nucleon and thus the process is promising for testing ΔG ( x , Q 2 ).

Two-spin asymmetry for ψ ′ photoproduction with the color-octet mechanism

We study the photoproduction of

Erratum to: “Λc+ production in polarized pp scattering and polarized gluon distribution”: [Phys. Lett. B 491 (2000) 117–122]

{ensuremath{psi}}^{ensuremath{}}

Charmed hadron production in neutrino reactions and polarized s-quark distribution

in the forward regions in polarized

POLARIZED s-QUARK DISTRIBUTION IN CHARMED HADRON LEPTOPRODUCTION

ensuremath{gamma}p

Electroproduction of ψ′ and polarized gluon distribution in a proton

collisions at relevant (DESY) HERA energies. We find that this reaction is very effective to test the color-octet mechanism which is based on the NRQCD factorization formalism. Furthermore we find that the value of the NRQCD matrix elements can be severely constrained by measuring the two-spin asymmetry, though the process depends on the polarized gluon distribution

Color-octet mechanism in low-pT Ψ′-productions

ensuremath{Delta}g(x).

Revisited Potential Model Approach to Narrow

To extract information about the polarized gluon distribution,

D_{sJ}

dg