Exclusive electroproduction of K+Lambda and K+Sigma(0) final states at Q(2)=0.030-0.055 (GeV/c)(2)

0384945 - ÚJF 2013 RIV DE eng J - Článek v odborném periodiku
Achenbach, P. - Gayoso, C. A. - Bernauer, J. C. - Bianchin, S. - Böhm, R. - Borodina, O. - Bosnar, D. - Bösz, M. - Bozkurt, V. - Bydžovský, Petr - Debenjak, L. - Distler, M. O. - Esser, A. - Friscic, I. - Gomez, M.R. - Göküzüm, B. - Griessinger, K. - Jennewein, P. - Kim, E. - Sirca, S. … celkem 34 autorů
Exclusive electroproduction of K+Lambda and K+Sigma(0) final states at Q(2)=0.030-0.055 (GeV/c)(2).
European Physical Journal A. Roč. 48, č. 14 (2012), s. 1-8. ISSN 1434-6001. E-ISSN 1434-601X
Grant CEP: GA ČR GA202/08/0984
Institucionální podpora: RVO:61389005
Klíčová slova: strangeness * meson production * electroproduction
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 2.043, rok: 2012

Cross-section measurements of the exclusive p(e, e' K+)Lambda, Sigma(0) electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the Kaos spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third-resonance region with virtual photons of low four-momenta, Q(2) - 0.030-0.055 (GeV/c)(2). The MAMI data indicate a smooth transition in Q(2) from photoproduction to electroproduction cross-sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N* resonances can be excluded from these models. Modern isobar and Regge-plus-resonance models are in agreement with the data.
Trvalý link: http://hdl.handle.net/11104/0216953