M. Segond

Diffractive production of two ρ0L mesons in e+e- collisions

We present an estimate of the cross-section for the exclusive production of a ρL0-meson pair in e+e- scattering, which will be studied in the future high-energy International Linear Collider. For this aim, we complete calculations of the Born order approximation of the amplitudes γ*L,T(Q12)γ*L,T(Q22)→ρL0ρL0, for arbitrary polarization of virtual photons and longitudinally polarized mesons, in the kinematical region s≫-t,Q12,Q22. These processes are completely calculable in the hard region Q12,Q22≫Λ2QCD, and we perform most of the calculations in an analytical way. The resulting cross-section turns out to be large enough for this process to be measurable with foreseen luminosity and energy, for Q12 and Q22 in the range of a few GeV2.

QCD factorizations in γ∗γ∗→ρL0ρL0

We calculate the lowest order QCD amplitude, i.e. the quark exchange contribution, to the forward production amplitude of a pair of longitudinally polarized

QCD factorizations in gamma* gamma* ---> rho rho

\rho

QCD factorizations in γ ∗ γ ∗ → ρ L 0 ρ L 0

mesons in the scattering of two virtual photons

QCD Factorizations in Exclusive gammagamma-->rhoL0rhoL0

\gamma^*(Q_1) \gamma^*(Q_2) \to \rho^0_L \rho^0_L

BFKL resummation effects in exclusive production of rho meson pairs at the ILC

. We show that the scattering amplitude simultaneously factorizes in two quite different ways: the part with transverse photons is described by the QCD factorization formula involving the generalized distribution amplitude of two final

Diffractive production of two ? 0 L mesons in e + e - collisi

\rho

QCD factorizations in ?*?*??L0?L0

mesons, whereas the part with longitudinally polarized photons takes the QCD factorized form with the

QCD factorizations in gammagamma-->rhoL0rhoL0

\gamma^*_L \to \rho^0_L

QCD factorizations in γ*γ* → ρ0Lρ0L

transition distribution amplitude. Perturbative expressions for these, in general, non-perturbative functions are obtained in terms of the