We present a detailed phenomenological study of $J/\ensuremath{\psi}$ polarization in semi-inclusive deep-inelastic scattering processes, focusing on the kinematics accessible at future Electron-Ion Collider. show theoretical estimates for standard parameters different frames usually adopted literature, large ${P}_{T}$ region, namely ${P}_{T}\ensuremath{\gg}{\mathrm{\ensuremath{\Lambda}}}_{\mat...

Both collinear factorization theorem 1 and kT factorization theorem 2,3 are the fundamental tools of perturbative QCD (PQCD), where kT denotes parton transverse momenta. In these theorems the amplitude for an exclusive process can be calculated as an expansion of αs(Q) and Λ/Q with Q being a large momentum transfer and Λ a small hadronic scale. Similarly, in the heavy quark limit mb → ∞, mb bei...

A bstract Employing the QCD factorization formalism we compute $$ {B}_u^{-}\to {\gamma}^{\ast}\mathrm{\ell}{\overline{v}}_{\mathrm{\ell}} B u − → γ ∗ ℓ <mml:...

A bstract We study chiral-odd quark-antiquark correlation functions suitable for lattice calculations of twist-three nucleon parton distribution h L ( x ) and e ), also the twist-two transversity ?q ). The corresponding factorized expressions are derived in terms collinear distributions to one-loop accuracy. results presented both position space, as factorization theorem Ioffe-time distribution...

There is also the subject of exclusive diffraction and skewed pdf’s, which I will not dicuss here. I will also not discuss the issue of Regge theory and Regge factorization, except indirectly in the context of the BFKL equation. Regge factorization does not follow in any demonstrated way from QCD, if one includes non-perturbative phenomena, and in the context of hard scattering, it clearly fail...