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Exclusive photoproduction of charmed D * vector mesons, \(\gamma + N\rightarrow Y_c + \overline{D^*}\), \(Y_c = \Lambda_c^ + \) or \(\Sigma_c\)

  • E. Tomasi-GustafssonEmail author
  • M. P. Rekalo
Article

Abstract.

The spin structure of the matrix element for the reactions \(\gamma + N\rightarrow Y_c + {D}^*\), where \(Y_c = \Lambda_c^ + (2285)\), \(\Sigma_c(2455)\) are charmed baryons with spin 1/2, and D *(2010) is the vector charmed meson, can be parametrized, in collinear regime, in terms of three independent scalar amplitudes, which are functions of the photon energy \(E_{\gamma}\), only. In the framework of an effective Lagrangian approach generalized to charm photoproduction, we calculate the energy dependence of the differential cross-section, the density matrix element of \(\overline{D}^*\), \(\rho_{11}\), the asymmetry A z in the collision of circularly polarized photons with polarized nucleons, and the polarization of the produced Y c -hyperon, P z , in the collision of circularly polarized photons with unpolarized target. All these polarization observables either vanish or are large, in absolute value, with a smooth \(E_{\gamma}\)-dependence, and differ for \(\Lambda_c^ + \) and \(\Sigma_c\) production.

Keywords

Matrix Element Photon Energy Density Matrix Energy Dependence Vector Meson 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.DAPNIA/SPhN, CEA/SaclayGif-sur-Yvette CedexFrance
  2. 2.NSC Kharkov Institute of Physics and TechnologyKharkovUkraine

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