jets in lepton-nucleus DIS. It is the purpose of this paper to show that by measuring the leading pions in DIS and their transverse momentum broadening, fixed target facilities, such as CEBAF [@Brodsky], can provide good information on the quark-gluon correlation functions defined in Eq. (\[T4qA\]).

This paper is organized as follows. In the next section, we derive the transverse momentum broadening of the leading pions in lepton-nucleus DIS. We demonstrate analytically the direct correspondence between the transverse momentum broadening of the leading pions and multiparton correlation functions. In Sec. III, we estimate the numerical values of such broadening at different values of $x_B$ and $Q^2$, by using the model of the quark-gluon correlation functions introduced in Ref. [@LQS2]. We also derive explicit relations of the transverse momentum broadening for $\pi^{\pm}$ and $\pi^0$, and discuss the $x_B$ and $Q^2$ dependence of the correlation functions.

Transverse momentum broadening of pions in DIS
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Consider leading pion production in the deeply inelastic lepton-nucleus scattering, $$e(k_1) + A(p) \longrightarrow e(k_2) + \pi(\ell) +X \ ,
\label{process}$$ where $k_1$ and $k_2$ are the four momenta of the incoming and the outgoing leptons respectively, $p$ is the momentum per nucleon for the nucleus with the 