Dilepton anisotropy from $p + Be$ and $Ca + Ca$ collisions at BEVALAC energies

Details Dilepton anisotropy from $p + Be$ and $Ca + Ca$ collisions at BEVALAC energies Dilepton anisotropy from $p + Be$ and $Ca + Ca$ collisions at BEVALAC energies

1996-01-12

arxiv.org/abs/nucl-th/9601018v1

Phys.Lett. B376 (1996) 12-18

Physics

Nuclear Physics

Nuclear Theory

10 pages, LaTeX, plus 4 postscript figures tarred, compressed and uuencoded in separate file

Scientific paper

10.1016/0370-2693(96)00302-4

A full calculation of lepton-pair angular characteristics is carried out for $e^+e^-$ pairs created in $p + Be$ and $Ca + Ca$ collisions from 1.0 to 2.1 GeV/A. It is demonstrated that the dilepton decay anisotropy depends sensitively on the different sources and may be used for their disentangling. Due to the dominance of the $\eta$-and $\Delta$-Dalitz decays and only a small anisotropy coefficient for $\pi^+\pi^-$ annihilation, the expected anisotropy coefficients show a decrease with invariant mass of the dilepton pair and change only moderately when comparing $p + Be$ and $Ca + Ca$ reactions at the same bombarding energy.

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