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Absorption of Λ(1520) hyperons in photon-nucleus collisions

  • Elementary Particles and Fields
  • Theory
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Abstract

In the framework of the nuclear spectral function approach for incoherent primary photon-nucleon and secondary pion-nucleon production processes we study the inclusive Λ(1520)-hyperon production in the interaction of 2-GeV photons with nuclei. In particular, the A and momentum dependences of the absolute and relative Λ(1520)-hyperon yields are investigated in two scenarios for its in-medium width. Our model calculations show that the pion-nucleon production channel contributes appreciably to the Λ(1520) creation at intermediate momenta both in light and heavy nuclei in the chosen kinematics and, hence, has to be taken into consideration on close examination of the dependences of the Λ(1520)-hyperon yields on the target mass number with the aim to get information on its width in the medium. They also demonstrate that the A and momentum dependences of the absolute and relative Λ(1520)-hyperon production cross sections at incident energy of interest are markedly sensitive to the Λ(1520) in-medium width, which means that these observables may be an important tool to determine the above width.

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  1. Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia

    E. Ya. Paryev

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Paryev, E.Y. Absorption of Λ(1520) hyperons in photon-nucleus collisions. Phys. Atom. Nuclei 75, 1523–1535 (2012). https://doi.org/10.1134/S1063778812110178

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