Measurement of the transverse–longitudinal cross sections in the p(e→,e′p)π0 reaction in the Δ region
- Kunz, C.
- Kaloskamis, N.I.
- Distler, M.O.
- Zhou, Z.-L.
- Alarcon, R.
- Barkhuff, D.
- Bernstein, A.M.
- Bertozzi, W.
- Calarco, J.
- Casagrande, F.
- Chen, J.
- Comfort, J.
- Dodson, G.
- Dooley, A.
- Dow, K.
- Farkhondeh, M.
- Georgakopoulos, S.
- Gilad, S.
- Hicks, R.
- Hotta, A.
- Jiang, X.
- Karabarbounis, A.
- Kowalski, S.
- Margaziotis, D.J.
- Mertz, C.
- Miskimen, R.
- Nakagawa, I.
- Papanicolas, C.N.
- Pavan, M.M.
- Peterson, G.
- Ramirez, A.
- Rowntree, D.
- Sarty, A.J.
- Shaw, J.
- Six, E.
- Sparveris, N.
- Soong, S.-B.
- Stiliaris, S.
- Tamae, T.
- Tieger, D.
- Tschalaer, C.
- Tsentalovich, G.
- Turchinetz, W.
- Vellidis, C.E.
- Warren, G.A.
- Williamson, S.
- Young, A.
- Zhao, J.
- Zwart, T.
DOIAbstract
AbstractAccurate measurements of the p(e→,e′p)π0 reaction were performed at Q2=0.127 (GeV/c)2 in the Δ resonance energy region. The experiments at the MIT-Bates Linear Accelerator used an 820 MeV polarized electron beam with the out-of-plane magnetic spectrometer system (OOPS). In this Letter we report the first simultaneous determination of both the TL and TL′ (“fifth” or polarized) cross sections at low Q2 where the pion cloud contribution is predicted to dominate the quadrupole amplitudes (E2 and C2). These are the real and imaginary parts of the transverse–longitudinal interference amplitudes and provide a sensitive determination of the Coulomb quadrupole amplitude and a test of reaction calculations. Comparisons with model calculations...
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