@article{3074792,
    title = "Measurement of the transverse-longitudinal cross sections in the p(e,→ ép)π0 reaction in the Δ region",
    author = "Kunz, C. and Kaloskamis, N.I. and Distler, M.O. and Zhou, Z.-L. and Alarcon, R. and Barkhuff, D. and Bernstein, A.M. and Bertozzi, W. and Calarco, J. and Casagrande, F. and Chen, J. and Comfort, J. and Dodson, G. and Dooley, A. and Dow, K. and Farkhondeh, M. and Georgakopoulos, S. and Gilad, S. and Hicks, R. and Hotta, A. and Jiang, X. and Karabarbounis, A. and Kowalski, S. and Margaziotis, D.J. and Mertz, C. and Miskimen, R. and Nakagawa, I. and Papanicolas, C.N. and Pavan, M.M. and Peterson, G. and Ramirez, A. and Rowntree, D. and Sarty, A.J. and Shaw, J. and Six, E. and Sparveris, N. and Soong, S.-B. and Stiliaris, S. and Tamae, T. and Tieger, D. and Tschalaer, C. and Tsentalovich, G. and Turchinetz, W. and Vellidis, C.E. and Warren, G.A. and Williamson, S. and Young, A. and Zhao, J. and Zwart, T.",
    journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
    year = "2003",
    volume = "564",
    number = "1-2",
    pages = "21-26",
    publisher = "Elsevier",
    doi = "10.1016/S0370-2693(03)00675-0",
    keywords = "accuracy;  analytical error;  article;  calculation;  comparative study;  electron;  electron beam;  energy;  linear accelerator;  measurement;  model;  negative pion radiation;  quantum mechanics;  spectrometer",
    abstract = "Accurate measurements of the p(→e, e′p)π0 reaction were performed at Q2 = 0.127 (GeV/c)2 in the A 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 are presented. The empirical MAID calculation gives the best overall agreement with this accurate data. The parameters of this model for the values of the resonant multipoles are [M1+(I = 3/2)| = (40.9 ± 0.3) × 10-3/mπ, CMR = C2/M1 = -6.5 ± 0.3%, EMR = E2/M1 = -2.2 ± 0.9%, where the errors are due to the experimental uncertainties. © 2003 Elsevier Science B.V. All rights reserved."
}