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The (pi(-), gamma gamma) reaction in nuclei and the sigma meson in the medium
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The (pi(-), gamma gamma) reaction in nuclei and the sigma meson in the medium
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| Roca Zamora, Luis; Oset Báguena, Eulogio Perfil | |||
| This document is a artículoDate2003 | |||
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Este documento está disponible también en : http://hdl.handle.net/10550/46955 |
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| A theoretical analysis of the (π−,γγ) reaction in nuclei is made in order to find the viability of this reaction to test modifications of the σ meson mass in nuclear matter. The ππ correlation in the scalar-isoscalar channel in nuclear matter could, in principle, manifest itself in this reaction since it plays an important role in the ππ→γγ mechanism. But we conclude that this effect is hardly visible in this reaction due to the strong background of the pion-Bremsstrahlung terms. Only with some special cuts and for some polarization states are the effect visible at the cost of a strong reduction in the cross section. | |||
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Roca Zamora, Luis Oset Báguena, Eulogio 2003 The (pi(-), gamma gamma) reaction in nuclei and the sigma meson in the medium Nuclear Physics A 723 1-2 129 144 |
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| http://dx.doi.org/10.1016/S0375-9474(03)01090-X |
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