Vector meson production by 4.3 GeV polarized photons on deuterium

Exploring the double-slit interference with linearly polarized photons

“…The vector meson production from linearly polarized photons also possesses distinctive signature in the asymmetries of the decay angular distributions. Continuous efforts [8][9][10][11][12][13][14] has been made for more than fifty years to utilize the linearly polarized photons in vector meson photoproduction as a parity filter for the exchange of particles in t channel, which is an effective tool to separate the natural from unnatural parity exchange in t channel. In this letter, we exploit the linearly polarized photons to investigate the interference effect for the vector meson photoproduction in heavy-ion collisions and demonstrate a periodic oscillation with transverse momentum for the asymmetries of the decay angular distributions.…”

Differential Cross Section for $γd \rightarrow ωd$ using CLAS at Jefferson Lab

“…The solid brown curve represents the contribution of the single scattering for input parameters corresponding to that of the red dashed-dotted curve. In the inset, the solid points are the results from [8] for an incident photon energy of 4.3 GeV.…”

“…Bubble chamber measurements [1] have low statistical precision. The best data on this reaction are from the Weizmann Institute [8], using a photon beam of energy 4.3 GeV and at |t| < 0.2 GeV 2 /c 2 , which is too small to see the effect of double-scattering as shown in Fig. 1b.…”

Reaction plane alignment with linearly polarized photon in heavy-ion collisions

“…In the ideal case (ignoring the size and density distribution of nuclei), the polarization direction of the scattered photons is fully aligned with the impact parameter for coherent photoproduction in heavy-ion collisions. Under the helicity no-flip assumption [16][17][18][19][20][21], the produced vector meson inherits the linear polarization state, which leads to the preferential orientation of the decay angle along the direction of polarization. This offers us an opportunity to determine the reaction plane via the decay asymmetry of the vector meson from coherent photoproduction, where the reaction plane is spanned by the impact parameter and the beam axis.…”