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Electroexcitation of the Roper resonance for 1.7 < Q(2)< 4.5 GeV(2) in ep -> en pi(+)статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Fedotov G., Golovatch E., Ishkhanov B.S., Isupov E.L., Mokeev V., CLAS C.
- Журнал: Physical Review C - Nuclear Physics
- Том: 78
- Номер: 4
- Год издания: 2008
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 045209
- DOI: 10.1103/PhysRevC.78.045209
- Аннотация: The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7 < Q(2)< 4.5 GeV(2) from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for pi(+) electroproduction on protons at W=1.15-1.69 GeV. The analysis is made using two approaches, dispersion relations and a unitary isobar model, which give consistent Q(2) behavior of the helicity amplitudes for the gamma(*)p -> N(1440)P(11) transition. It is found that the transverse helicity amplitude A(1/2), which is large and negative at Q(2)=0, becomes large and positive at Q(2)similar or equal to 2 GeV(2), and then drops slowly with Q(2). The longitudinal helicity amplitude S(1/2), which was previously found from CLAS ep -> ep pi(0),en pi(+) data to be large and positive at Q(2)=0.4,0.65 GeV(2), drops with Q(2). Available model predictions for gamma(*)p -> N(1440)P(11) allow us to conclude that these results provide strong evidence in favor of N(1440)P(11) as a first radial excitation of the 3q ground state. The results of the present paper also confirm the conclusion of our previous analysis for Q(2)< 1 GeV(2) that the presentation of N(1440)P(11) as a q(3)G hybrid state is ruled out.
- Добавил в систему: Ишханов Борис Саркисович