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\title{
{\bf \Huge Technical Note}\\
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{\bf \Large $\bf{\pi}^{-}/{\pi}^{+}$ Separated Response Functions Ratios
in Forward Pion Electroproduction in Deuterium at $\bf Q^2 = 0.6-2.45$ $\bf
GeV^2$ and $\bf t=0.1-0.4$ $\bf GeV^2$}
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\author{Dr. Cornel Butuceanu}
\affiliation{University of Regina}

\author{Dr. Garth Huber}
\affiliation{University of Regina}

\author{Dr. Henk Blok}
\affiliation{VU University}

\author{Dr. David Gaskell}
\affiliation{Jefferson Laboratory}

\author{Dr. Tanja Horn}
\affiliation{Jefferson Laboratory}

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\begin{abstract}
{The first complete separation of the four unpolarized electromagnetic response
functions above the dominant resonances has been made for forward, exclusive
$\pi^{\pm}$ electroproduction on the nucleon in the $Q^2 = 0.6 - 2.45 $
(GeV/c)$^2$ range.  The separated ratio $R_L=\sigma_L^{\pi^-}/\sigma_L^{\pi^+}$
is sensitive to isoscalar contamination to the dominant isovector pion exchange
amplitude, which is the basis for the determination of the charged pion form
factor, $F_{\pi}(Q^2)$, from electroproduction data.  The value of this ratio
may also have implications for constraining polarized GPD's with ratios of
longitudinal observables.  At large $-t$, a separated ratio value of $R_T =
\sigma_T^{\pi^-}/\sigma_T^{\pi^+}\simeq 1/4$ would suggest a transition between
pion and quark knockout mechanisms.  The results presented here indicate a
dominance of the pion pole diagram at low $-t$.}
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