Differential cross section and recoil polarization measurements for the γ p → K + Λ reaction using CLAS at Jefferson Lab

We present measurements of the differential cross section and Lambda recoil polarization for the gamma p to K+ Lambda reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ productio...

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Veröffentlicht in:	Physical Review C 2010-02, Vol.81 (2), Article 025201
Hauptverfasser:	McCracken, M. E., Bellis, M., Meyer, C. A., Williams, M., Adhikari, K. P., Anghinolfi, M., Ball, J., Battaglieri, M., Berman, B. L., Biselli, A. S., Branford, D., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Careccia, S. L., Carman, D. S., Cole, P. L., Collins, P., Crede, V., D’Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Doughty, D., Dugger, M., Dupre, R., El Alaoui, A., Eugenio, P., Fegan, S., Fradi, A., Gabrielyan, M. Y., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Gothe, R. W., Griffioen, K. A., Guidal, M., Hafidi, K., Hakobyanm, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Jo, H. S., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Kuznetsov, V., Livingston, K., Mayer, M., McAndrew, J., McKinnon, B., Mestayer, M. D., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Perrin, Y., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Quinn, B., Raue, B. A., Ricco, G., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P.
Format:	Artikel
Sprache:	eng
Schlagworte:	ACCURACY ATOMIC AND MOLECULAR PHYSICS DATA DIFFERENTIAL CROSS SECTIONS ENERGY ENERGY RANGE Nuclear Experiment PHOTOPRODUCTION Physics POLARIZATION PRODUCTION RANGE RECOILS
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Beschreibung
Zusammenfassung:	We present measurements of the differential cross section and Lambda recoil polarization for the gamma p to K+ Lambda reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ production angles. Independent analyses were performed using the K+ p pi- and K+ p (missing pi -) final-state topologies; results from these analyses were found to exhibit good agreement. These differential cross section measurements show excellent agreement with previous CLAS and LEPS results and offer increased precision and a 300 MeV increase in energy coverage. The recoil polarization data agree well with previous results and offer a large increase in precision and a 500 MeV extension in energy range. The increased center-of-mass energy range that these data represent will allow for independent study of non-resonant K+ Lambda photoproduction mechanisms at all production angles.
ISSN:	0556-2813 2469-9985 1089-490X 2469-9993
DOI:	10.1103/PhysRevC.81.025201