Another Look at ``soft'' lepton pair production in nucleon-nucleon bremsstrahlung

Details Another Look at ``soft'' lepton pair production in nucleon-nucleon bremsstrahlung Another Look at ``soft'' lepton pair production in nucleon-nucleon bremsstrahlung

1995-01-17

arxiv.org/abs/nucl-th/9501015v1

Int.J.Mod.Phys. E6 (1997) 475-496

Physics

Nuclear Physics

Nuclear Theory

29 pages, ReVTeX 3.0, with 13 figures postscript figures uuencoded and appended.

Scientific paper

We compare different formalisms for the calculation of lepton pair emission in hadron-hadron collisions and discuss the consequences of the approximations inherent to each of them. Using a Lorentz-covariant and gauge-invariant formalism proposed by Lichard, we calculate lepton pair emission via bremsstrahlung in proton-proton and neutron-proton reactions at energies between 1 and 5 GeV to leading order in the virtual photon four-momentum. These new results suggest that some previous bremsstrahlung calculations based on varieties of the soft-photon approximation might have somewhat overestimated the DLS low-mass dilepton cross sections. We find that the respective intensities of dilepton production through $p p$ and $n p$ bremsstrahlung are energy-dependent and become comparable at $E_{\rm kin} \agt $ 2 GeV. We also calculate the polar angle anisotropy of the lepton spectrum.

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