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Cross sections and Rosenbluth separations in 1H(e, e'K+)Lambda up to Q2=2.35 GeV2

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arxiv 0911.3943 v1 pith:C3XIBRNU submitted 2009-11-20 nucl-ex

Cross sections and Rosenbluth separations in 1H(e, e'K+)Lambda up to Q2=2.35 GeV2

M. Coman , P. Markowitz , K.A. Aniol , K. Baker , W.U. Boeglin , H. Breuer , P. Bydzovsky , A. Camsonne
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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. Dieterich F. 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. Sirca 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
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keywords crosssectionsenergykaondependenceelectroproductiongev2lambda
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The kaon electroproduction reaction 1H(e,e'K+)Lambda 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 5.75 GeV. The center of mass cross section was determined for 21 kinematics corresponding to Q2 of 1.90 and 2.35 GeV2 and the longitudinal, sigmaL, and transverse, sigmaT, 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 sigmaT and sigmaL.

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