Polarization phenomena in open charm photoproduction processes

Details Polarization phenomena in open charm photoproduction processes Polarization phenomena in open charm photoproduction processes

2003-10-14

arxiv.org/abs/hep-ph/0310172v1

Phys.Rev. D69 (2004) 094015

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages 13 figures

Scientific paper

10.1103/PhysRevD.69.094015

We analyze polarization effects in associative photoproduction of pseudoscalar ($\bar{D}$) charmed mesons in exclusive processes $\gamma+ N\to Y_c +\bar{D}$, $Y_c=\Lambda_c^+$, $\Sigma_c$. Circularly polarized photons induce nonzero polarization of the $Y_c$-hyperon with $x$- and $z$-components (in the reaction plane) and non vanishing asymmetries ${\cal A}_x$ and ${\cal A}_z$ for polarized nucleon target. These polarization observables can be predicted in model-independent way for exclusive $\bar{D}$-production processes in collinear kinematics. The T-even $Y_c$-polarization and asymmetries for non-collinear kinematics can be calculated in framework of an effective Lagrangian approach. The depolarization coefficients $D_{ab}$, characterizing the dependence of the $Y_c$-polarization on the nucleon polarization are also calculated.

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