High-Energy Hadron-Induced Dilepton Production from Nucleons and Nuclei

Abstract

We review the production of high-mass lepton pairs in fixed-target experiments, including both Drell-Yan (DY) and heavy quarkonium (J/Psi and Upsilons) production.

Figures (20)

• Figure 1: Combined dimuon mass spectrum from Fermilab E866 e866: $p + p$ and $p + d$ collisions at 800 GeV/c. The shape of the continuum results from the mass dependence of the DY process folded with the acceptance of the spectrometer.
• Figure 2: Feynman graphs for the electromagnetic processes (a) deeply inelastic lepton scattering and (b) the Drell-Yan process.
• Figure 3: Proton-induced Drell-Yan production from experiments NA3 na3dy (triangles) at 400 GeV/c, E605 e605 (squares) at 800 GeV/c, and E772 (e772dimu; PL McGaughey et al, unpublished data) (circles) at 800 GeV/c. The lines are absolute (no arbitrary normalization factor) next-to-leading order calculations for $p + d$ collisions at 800 GeV/c using the CTEQ4M structure functions cteq.
• Figure 4: Drell-Yan angular distribution from Fermilab E772 QM96: $p + Cu$ collisions at 800 GeV/c. The dimuons cover the mass region $11\leq M_{\mu^+\mu^-} \leq 17$ GeV/c$^2$ with $-0.3\leq x_F\leq 0.8$ and $p_t \leq$ 6 GeV/c. Mean values for $p_t$, $x_F$, and $M$ are 1.4 GeV/c, 0.16, and 11.9 GeV/c$^2$, respectively. The solid curve is a fit to the data with the form $1 + \lambda cos^2\theta$, where $\lambda$ is $0.96 \pm .04 \pm .06$.
• Figure 5: Feynman graphs for order $\alpha_s$ corrections to the Drell-Yan process