Longitudinal and Transverse Cross Sections in the1H(e,e′K+)ΛReaction
1998; American Physical Society; Volume: 81; Issue: 9 Linguagem: Inglês
10.1103/physrevlett.81.1805
ISSN1092-0145
AutoresG. Niculescu, R. Mohring, P. Guèye, D. Abbott, A. Ahmidouch, Ts.A. Amatuni, P. Ambrozewicz, T. Angelescu, Christopher Armstrong, K. Assamagan, S. Avery, K. Bailey, O. K. Baker, K. Beard, S. Beedoe, E. J. Beise, H. Breuer, R. Carlini, J. Cha, C. C. Chang, N. S. Chant, E. Cisbani, G. Collins, W. J. Cummings, S. Danagoulian, R. De Leo, F. Duncan, J. Dunne, D. Dutta, T. Eden, R. Ent, L. Eyraud, L. Ewell, Michael R. Finn, T. Fortune, V. Frolov, S. Frullani, C. Furget, F. Garibaldi, D. Gaskell, D. F. Geesaman, K. Gustafsson, O. Hansen, M. Harvey, W. Hinton, E.V. Hungerford, M. Iodice, C. Jackson, C. Keppel, W. Kim, K. Kino, D. Koltenuk, S. Kox, L. H. Kramer, T. Leone, G. J. Lolos, A. Lung, D. Mack, R. Madey, Masaki Maeda, S. Majewski, P. Markowitz, C. J. Martoff, D. Meekins, A. Mihul, Jason W. Mitchell, H. Mkrtchyan, S. Mtingwa, I. Niculescu, R. Perrino, D. H. Potterveld, J. W. Price, B. A. Raue, J. S. Réal, J. Reinhold, P. G. Roos, T. Saito, G. Savage, R. Sawafta, R. E. Segel, S. Stepanyan, P. Stoler, V. Tadevosian, L. Tang, L. Teodorescu, T. Terasawa, H. Tsubota, G. M. Urciuoli, J. Volmer, W. Vulcan, P. Welch, Robert A. Williams, S. A. Wood, C. Yan, B. Zeidman,
Tópico(s)High-Energy Particle Collisions Research
ResumoThe ${}^{1}\mathrm{H}({e,e}^{\ensuremath{'}}{K}^{+})\ensuremath{\Lambda}$ reaction was studied as a function of the squared four-momentum transfer, ${Q}^{2}$, and the virtual photon polarization, $\ensuremath{\varepsilon}$. For each of four ${Q}^{2}$ settings, 0.52, 0.75, 1.00, and 2.00 $(\mathrm{GeV}/c{)}^{2}$, the longitudinal and transverse virtual photon cross sections were extracted in measurements at three virtual photon polarizations. The ${Q}^{2}$ dependence of the ${\ensuremath{\sigma}}_{L}/{\ensuremath{\sigma}}_{T}$ ratio differs significantly from current theoretical predictions. This, combined with the precision of the measurement, implies a need for revision of existing calculations.
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