Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-02-24
Phys.Lett.B351:533-540,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1016/0370-2693(95)00445-Q
We apply the light-cone technique to electroproduction reaction $ep\to e\pi^+n$ long considered as a means of measuring the electromagnetic form factor of the pion. We show that the interpretation of the long-standing puzzle of large transverse cross section ($\sigma_T$) in terms of the $\gamma^*\rho\to \pi$ transition on the $\rho$ mesons in the light-cone proton is possible, but requires quite a slow decrease of the $F_{\rho\pi}(\q2)$ form factor. This interpretation can be tested in the related $ep\to e\pi^0p$ reaction. Corrections which are due to the final-state meson-baryon interactions (FSI) are evaluated and are shown to amount to a $25\%$ effect at moderately large $\q2$. Vanishing FSI with increasing $Q^2$ - the color transparency phenomenon - is shown to be very strong.
Speth Josef
Zoller Vladimir R.
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