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We review the origin, and salient features, of the breaking of the conventional linear $k_{perp}$-factorization for an in-nucleus hard pQCD processes. A realization of the nonlinear $k_{perp}$-factorization which emerges instead is shown to depend on color properties of the underlying pQCD subprocesses. We discuss the emerging universality classes and extend nonlinear $k_{perp}$-factorization to AGK unitarity rules for the excitation of the target nucleus.
We summarize the standard factorization theorems for hard processes in QCD, and describe their proofs.
We report the simultaneous observations of the prompt emission in the gamma-ray and hard X-ray bands by the Swift-BAT and the KONUS-Wind instruments of the short-hard burst, GRB 060313. The observations reveal multiple peaks in both the gamma-ray and
We analyze two consequences of the relationship between collinear factorization and $k_t$-factorization. First, we show that the $k_t$-factorization gives a fundamental justification for the choice of the hard scale $Q^2$ done in the collinear factor
We study the exclusive production of $J^{PC}=0^{++}, 0^{--}$ charmonium states in proton-proton collisions at the LHC energies The $pp to ppeta_c$ reaction is discussed for the first time. We observe a substantial contribution from the nonperturbativ
We present the details of a new factorized approach to semi-inclusive deep-inelastic scattering which treats QED and QCD radiation on equal footing, and provides a systematically improvable approximation to the extraction of transverse momentum depen