Vector mesons polarization versus color transparency

Abstract

Abstract. Vector mesons V = ρ, ω, ϕ can be transversely (helicity λ = ±1) or longitudinally (λ = 0) polarized. Can vector mesons polarization influence on their interaction with nucleons and nuclei? The meson-nucleon total cross sections can be extracted by measuring the absorption of mesons in production off nuclei as the nuclear absorption depends on the meson-nucleon total cross section and consequently on the vector meson polarization. Latter on I will discuss the possibility of difference in interaction of transverse and longitudinally polarized vector mesons with nucleons and experiments in which such difference can be detected.

Vector mesons production off nuclei at the new planned QCD facility at CERN

“…The t dependence of R is determined essentially by the t dependence of the SDME r 04 00 (see (A.1)), which is found to be approximately flat in t both at HERMES (see Fig. 10) and at H1 [12] and ZEUS [11] kinematics. For this case, the ratio of the total cross sections coincides with the ratio of the cross sections that are differential in t (see (34)).…”

“…The knowledge of the cross section σ L (V N) is important for interpreting the color screening effect in the vector meson leptoproduction [11]. The idea of the color transparency (CT) is that a hadron produced in certain hard-scattering processes has a smaller probability to interact in the nuclear matter due to its smaller size compared to the physical hadron.…”

“…The dependence of σ L (ρN) and σ T (ρN) on invariant energy W = √ s, calculated in the color dipole model with different parameterizations of vector mesons wave functions [11] is shown on Fig. 1.…”