Energy Loss versus Shadowing in the Drell-Yan Reaction on Nuclei

Abstract

We present a new analysis of the E772 and E866 experiments on the nuclear dependence of Drell-Yan (DY) lepton pair production resulting from the bombardment of ${}^{2}H$, Be, C, Ca, Fe, and W targets by 800 GeV/c protons at Fermilab. We employ a light-cone formulation of the DY reaction in the rest frame of the nucleus, where the dimuons detected at small values of Bjorken x_2 << 1 may be considered to originate from the decay of a heavy photon radiated from an incident quark in a bremsstrahlung process. We infer the energy loss of the quark by examining the suppression of the nuclear-dependent DY ratios seen as a function of projectile momentum fraction x_1 and dimuon mass M. Shadowing, which also leads to nuclear suppression of dimuons, is calculated within the same approach employing the results of phenomenological fits to deep inelastic scattering data from HERA. The analysis yields -dE/dz =2.73 +/- 0.37 +/- 0.5 GeV/fm for the rate of quark energy loss per unit path length, a value consistent with theoretical expectations including the effects of the inelastic interaction of the incident proton at the surface of the nucleus. This is the first observation of a nonzero energy loss effect in such experiments.

arXiv comment43 pages including 17 figures

References in corpus (24)

• Radiative energy loss and $p_{\perp }$-broadening of high energy partons in nuclei
• Saturation Effects in Deep Inelastic Scattering at low $Q^2$ and its Implications on Diffraction
• Radiative energy loss of high energy quarks and gluons in a finite volume quark-gluon plasma
• Energy loss in perturbative QCD
• Scale evolution of nuclear parton distributions
• A Re-Evaluation of the nuclear Structure Function Ratios for D, He, Li, C and Ca
• Nonperturbative Effects in Gluon Radiation and Photoproduction of Quark Pairs
• Bremsstrahlung of a Quark Propagating through a Nucleus
• Hadron Formation in Deep-Inelastic Positron Scattering in a Nuclear Environment
• Parton energy loss limits and shadowing in Drell-Yan dimuon production
• Coherence Phenomena in Charmonium Production off Nuclei at the Energies of RHIC and LHC
• A Bound on the Energy Loss of Partons in Nuclei
• Transverse Dynamics of Hard Partons in Nuclear Media and the QCD Dipole
• The Drell-Yan Process and Factorization in Impact Parameter Space
• Nuclear Shadowing and Coherence Length for Longitudinal and Transverse Photons
• The color dipole picture of the Drell-Yan process
• Nonperturbative Gluon Radiation and Energy Dependence of Elastic Scattering
• Soft QCD Dynamics of Elastic Scattering in Impact Parameter Representation
• Energy loss of fast quarks in nuclei
• Challenges of Nuclear Shadowing in DIS
• Scaling Variable for Nuclear Shadowing in Deep-Inelastic Scattering
• Soft Component of Hard Reactions and Nuclear Shadowing (DIS, Drell-Yan reaction, heavy quark production)
• J/psi Production and Absorption in High Energy Proton-Nucleus Collisions
• Coherence Time in High Energy Proton-Nucleus Collisions

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• Coherence Phenomena in Charmonium Production off Nuclei at the Energies of RHIC and LHC
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• The Drell-Yan nuclear modification due to the nuclear effects of nPDFs and initial-state parton energy loss
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