e^+e^- Pair Production from $γ$ A Reactions

Details e^+e^- Pair Production from $γ$ A Reactions e^+e^- Pair Production from $γ$ A Reactions

1999-03-09

arxiv.org/abs/nucl-th/9903026v2

Phys.Rev.C60:044614,1999

Physics

Nuclear Physics

Nuclear Theory

42 pages including 16 figures

Scientific paper

10.1103/PhysRevC.60.044614

We present a calculation of e^+e^- production in $\gamma A$ reactions at MAMI and TJNAF energies within a semi-classical BUU transport model. Dilepton invariant mass spectra for $\gamma$C, $\gamma$Ca and $\gamma$Pb are calculated at 0.8, 1.5 and 2.2 GeV. We focus on observable effects of medium modifications of the $\rho$ and $\omega$ mesons. The in-medium widths of these mesons are taken into account in a dynamical, consistent way. We discuss the transport theoretical treatment of broad resonances.

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