\title{Direct Measurement of Initial-State Energy Loss in Cold Nuclear Matter at Fermilab E906/SeaQuest}
 
\author{Sho Uemura\\Los Alamos National Laboratory\\for the SeaQuest Collaboration}
 
\date{April 13-16, 2019}
 
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\begin{abstract}

    The study of parton energy loss in cold nuclear matter is crucial for understanding the nuclear medium properties in heavy ion experiments.
    The nuclear modification $R_{pA}$ of the Drell-Yan process is a clean channel for measuring initial-state quark energy loss.
    The E906/SeaQuest experiment at the Fermilab Main Injector measures Drell-Yan, $J/\psi$, and $\psi'$ production for p+A collisions with H, D, C, Fe, and W targets.
    The proton beam energy of 120 GeV ($\sqrt{s_{NN}}=15$ GeV) amplifies the expected energy loss effects relative to previous experiments with higher beam energies.
    The spectrometer acceptance is optimal for large target $x$ where other nuclear effects, such as shadowing, are expected to be small.
    We present the current status of this measurement.
    %https://indico.cern.ch/event/766194/registrations/46025/?token=e5827ee1-5ee4-4a1e-8a07-90571e6cb8b2

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