Cross sections and Rosenbluth separations in H1(e,eK +)Λ up to Q2=2.35GeV2

M. Coman*, P. Markowitz, K. A. Aniol, K. Baker, W. U. Boeglin, H. Breuer, P. Bydẑovský, A. Camsonne, J. Cha, C. C. Chang, N. Chant, J. P. Chen, E. A. Chudakov, E. Cisbani, L. Cole, F. Cusanno, C. W. De Jager, R. De Leo, A. P. Deur, S. DieterichF. Dohrmann, D. Dutta, R. Ent, O. Filoti, K. Fissum, S. Frullani, F. Garibaldi, O. Gayou, F. Gilman, J. Gomez, P. Gueye, J. O. Hansen, D. W. Higinbotham, W. Hinton, T. Horn, B. Hu, G. M. Huber, M. Iodice, C. Jackson, X. Jiang, M. Jones, K. Kanda, C. Keppel, P. King, F. Klein, K. Kozlov, K. Kramer, L. Kramer, L. Lagamba, J. J. Lerose, N. Liyanage, D. J. Margaziotis, S. Marrone, K. McCormick, R. W. Michaels, J. Mitchell, T. Miyoshi, S. Nanda, M. Palomba, V. Pattichio, C. F. Perdrisat, E. Piasetzky, V. A. Punjabi, B. Raue, J. Reinhold, B. Reitz, R. E. Roche, P. Roos, A. Saha, A. J. Sarty, Y. Sato, S. Airca, M. Sotona, L. Tang, H. Ueno, P. E. Ulmer, G. M. Urciuoli, A. Uzzle, A. Vacheret, K. Wang, K. Wijesooriya, B. Wojtsekhowski, S. Wood, I. Yaron, X. Zheng, L. Zhu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The kaon electroproduction reaction H1(e,eK +)Λ was studied as a function of the virtual-photon four-momentum, Q2, total energy, W, and momentum transfer, t, for different values of the virtual-photon polarization parameter. Data were taken at electron beam energies ranging from 3.40 to 5.75GeV. The center of mass cross section was determined for twenty-one kinematics corresponding to Q2 of 1.90 and 2.35GeV2, and the longitudinal, σL, and transverse, σT, cross sections were separated using the Rosenbluth technique at fixed W and t. The separated cross sections reveal a flat energy dependence at forward kaon angles not satisfactorily described by existing electroproduction models. Influence of the kaon pole on the cross sections was investigated by adopting an off-shell form factor in the Regge model, which better describes the observed energy dependence of σT and σL.

Original languageEnglish
Article number052201
JournalPhysical Review C - Nuclear Physics
Issue number5
StatePublished - 24 May 2010


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