Nuclear dependence of the coherent η photoproduction reaction in a relativistic approach

Laith Aburaddad, J. Piekarewicz, A. J. Sarty, M. Benmerrouche

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We study the nuclear (or A) dependence of the coherent η photoproduction reaction in a relativistic impulse approximation approach. We use a standard relativistic parametrization of the elementary amplitude, based on a set of four Lorentz-and gauge-invariant amplitudes, to calculate the coherent production cross section from 4He, 12C, and 40Ca. In contrast to nonrelativistic treatments, our approach maintains the full relativistic structure of the process. The nuclear structure affects the process through the ground-state tensor density. This density is sensitive to relativistic effects and depends on A in a different manner than the vector density used in nonrelativistic approaches. This peculiar dependence results in 4He having a cross section significantly smaller than that of 12C - in contrast to existent nonrelativistic calculations. Distortion effects are incorporated through an η-nucleus optical potential that is computed in a simple "tp" approximation.

Original languageEnglish
Pages (from-to)2053-2056
Number of pages4
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - Apr 1998
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

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