Polarized Structure Function $\sigma_{LT'}$ for $p({\vec e},e'K^+)\Lambda$ in the Nucleon Resonance Region

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2008-06, Vol.77
• Main Authors: Raue, Brian, Ambrozewicz, Pawel, Anghinolfi, Marco, Asavapibhop, Burin, Auger, Thierry, Avagyan, Harutyun, Baghdasaryan, Hovhannes, Baltzell, Nathan, Bektasoglu, Mehmet, Benmouna, Nawal, Blaszczyk, Lukasz, Briscoe, William, Careccia, Sharon, Casey, Liam, Cetina, Catalina, Cole, Philip, Coltharp, Philip, Dashyan, Natalya, De Sanctis, Enzo, Dickson, Richard, Djalali, Chaden, Doughty, David, Dragovitsch, Peter, Dugger, Michael, Egiyan, Hovanes, Elfassi, Lamiaa, Elouadrhiri, Latifa, Fatemi, Renee, Goetz, John, Gothe, Ralf, Griffioen, Keith, Guidal, Michel, Guler, Nevzat, Guo, Lei, Hafidi, Kawtar, Hakobyan, Hayk, Hanretty, Charles, Hersman, F, Hleiqawi, Ishaq, Holtrop, Maurik, Hu, Jicun, Ireland, David, Isupov, Evgeny, Ito, Mark, Jenkins, David, Jo, Hyon-Suk, Kalantarians, Narbe, Khandaker, Mahbubul, Kim, Kyungmo, Kim, Wooyoung, Klein, Franz, Kossov, Mikhail, Kramer, Laird, Kubarovsky, Valery, Kuhn, Sebastian, Kuznetsov, Viacheslav, Lawrence, David, Livingston, Kenneth, Lukashin, Konstantin, Manak, Joseph, Mattione, Paul, Meyer, Curtis, Mikhaylov, Konstantin, Minehart, Ralph, Miskimen, Rory, Mokeev, Viktor, Moriya, Kei, Morrow, Steven, Moteabbed, Maryam, Munevar Espitia, Edwin, Mutchler, Gordon, Nadel-Turonski, Pawel, Niccolai, Silvia, Niroula, Megh, Niyazov, Rustam, Nozar, Mina, Pasyuk, Evgueni, Peterson, Gerald, Pierce, Joshua, Pocanic, Dinko, Procureur, Sebastien, Qin, Liming, Rosner, Guenther, Rossi, Patrizia, Rubin, Philip, Sabatie, Franck, Salgado, Carlos, Santoro, Joseph, Shafi, Aziz, Sharov, Dmitri, Shvedunov, Nikolay, Smith, Lee, Sober, Daniel, Stavinsky, Aleksey, Stepanyan, Stepan, Taiuti, Mauro, Tkabladze, Avtandil, Ungaro, Maurizio, Vlassov, Alexander, Wang
• Format: Article
• Language: English
• Subjects: KAONS; NUCLEONS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; RESONANCE; S CHANNEL; STRUCTURE FUNCTIONS
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.77.065208

The first measurements of the polarized structure function $\sigma_{LT'}$ for the reaction $p(\vec e,e'K^+)\Lambda$ in the nucleon resonance region are reported. Measurements are included from threshold up to $W$=2.05 GeV for central values of $Q^2$ of 0.65 and 1.00 GeV$^2$, and nearly the entire kaon center-of-mass angular range. $\sigma_{LT'}$ is the imaginary part of the longitudinal-transverse response and is expected to be sensitive to interferences between competing intermediate s-channel resonances, as well as resonant and non-resonant processes. The results for $\sigma_{LT'}$ are comparable in magnitude to previously reported results from CLAS for $\sigma_{LT}$, the real part of the same response. An intriguing sign change in $\sigma_{LT'}$ is observed in the high $Q^2$ data at $W\approx 1.9$ GeV. Comparisons to several existing model predictions are shown.