Measurement of longitudinal and transverse cross sections in the 3 He ( e , e ′ π </mml:…
2001; American Institute of Physics; Volume: 65; Issue: 1 Linguagem: Inglês
10.1103/physrevc.65.011001
ISSN1538-4497
AutoresD. Gaskell, A. Ahmidouch, P. Ambrozewicz, H. Anklin, J. Arrington, K. Assamagan, S. Avery, K. Bailey, O. K. Baker, S. Beedoe, B. Beise, H. Breuer, D. S. Brown, R. Carlini, J. Cha, N. S. Chant, A. A. Cowley, S. Danagoulian, D. De Schepper, J. Dunne, D. Dutta, R. Ent, L. Gan, A. Gasparian, D. F. Geesaman, R. Gilman, C. Glashausser, P. Guèye, M. Harvey, Osamu Hashimoto, W. Hinton, G. Hofman, C. Jackson, H. E. Jackson, C. Keppel, E. Kinney, D. Koltenuk, A. Lung, D. Mack, D. McKee, Jason W. Mitchell, H. Mkrtchyan, B. Mueller, G. Niculescu, I. Niculescu, T. G. O’Neill, V. Papavassiliou, D. H. Potterveld, J. Reinhold, P. Roos, R. Sawafta, R. E. Segel, S. Stepanyan, V. Tadevosyan, T. Takahashi, L. Tang, B. Terburg, Derek van Westrum, J. Volmer, T. P. Welch, S. A. Wood, L. Yuan, B. Zeidman, B. Zihlmann,
Tópico(s)Advanced Chemical Physics Studies
ResumoThe coherent ${}^{3}\mathrm{He}{(e,e}^{\ensuremath{'}}{\ensuremath{\pi}}^{+}{)}^{3}\mathrm{H}$ reaction was measured at ${Q}^{2}=0.4 (\mathrm{GeV}{/c)}^{2}$ and $W=1.6 \mathrm{GeV}$ for two values of the virtual photon polarization, \ensuremath{\epsilon}, allowing the separation of longitudinal and transverse cross sections. The results from the coherent process on ${}^{3}\mathrm{He}$ were compared to $\mathrm{H}{(e,e}^{\ensuremath{'}}{\ensuremath{\pi}}^{+})n$ data taken at the same kinematics. This marks the first direct comparison of these processes. At these kinematics ${(p}_{\ensuremath{\pi}}=1.1 \mathrm{GeV}/c),$ pion rescattering from the spectator nucleons in the ${}^{3}\mathrm{He}{(e,e}^{\ensuremath{'}}{\ensuremath{\pi}}^{+}{)}^{3}\mathrm{H}$ process is expected to be small, simplifying the comparison to ${\ensuremath{\pi}}^{+}$ production from the free proton.
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