The transition helicity amplitudes from the proton ground state to the P-11(1440) and D-13(1520) excited states (gamma(v)pN* electrocouplings) were determined from the analysis of nine independent one-fold differential pi(+)pi(-)p electroproduction cross sections off a proton target, taken with CLAS at photon virtualities of 0.25 < Q(2) < 0.60 GeV2. The phenomenological reaction model was employed for separation of the resonant and nonresonant contributions to the final state. The P-11(1440) and D-13(1520) electrocouplings were obtained from the resonant amplitudes parametrized within the framework of a unitarized Breit-Wigner ansatz. They are consistent with results obtained in the previous CLAS analyses of the pi(+)n and pi(0)p channels. The successful description of a large body of data in dominant meson-electroproduction channels off protons with the same gamma(v)pN* electrocouplings offers clear evidence for the reliable extraction of these fundamental quantities from meson-electroproduction data. This analysis also led to the determination of the long-awaited hadronic branching ratios for the D13(1520) decay into Delta pi (24%-32%) and N rho (8%-17%).

Mokeev, V., Burkert, V., Elouadrhiri, L., Fedotov, G., Golovatch, E., Gothe, R., et al. (2012). Experimental study of the P-11(1440) and D-13(1520) resonances from the CLAS data on ep -> e 'pi(+)pi(-)p. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 86, 035203-035222 [10.1103/PhysRevC.86.035203].

Experimental study of the P-11(1440) and D-13(1520) resonances from the CLAS data on ep -> e 'pi(+)pi(-)p

D'ANGELO, ANNALISA;
2012-01-01

Abstract

The transition helicity amplitudes from the proton ground state to the P-11(1440) and D-13(1520) excited states (gamma(v)pN* electrocouplings) were determined from the analysis of nine independent one-fold differential pi(+)pi(-)p electroproduction cross sections off a proton target, taken with CLAS at photon virtualities of 0.25 < Q(2) < 0.60 GeV2. The phenomenological reaction model was employed for separation of the resonant and nonresonant contributions to the final state. The P-11(1440) and D-13(1520) electrocouplings were obtained from the resonant amplitudes parametrized within the framework of a unitarized Breit-Wigner ansatz. They are consistent with results obtained in the previous CLAS analyses of the pi(+)n and pi(0)p channels. The successful description of a large body of data in dominant meson-electroproduction channels off protons with the same gamma(v)pN* electrocouplings offers clear evidence for the reliable extraction of these fundamental quantities from meson-electroproduction data. This analysis also led to the determination of the long-awaited hadronic branching ratios for the D13(1520) decay into Delta pi (24%-32%) and N rho (8%-17%).
2012
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
NUCLEON FORM-FACTORS; PI-N SCATTERING; BARYON RESONANCES; MESON PRODUCTION; QUARK-MODEL; DECAYS; ELECTROPRODUCTION; REGION
CLAS Collaboration
http://journals.aps.org/prc/abstract/10.1103/PhysRevC.86.035203
Mokeev, V., Burkert, V., Elouadrhiri, L., Fedotov, G., Golovatch, E., Gothe, R., et al. (2012). Experimental study of the P-11(1440) and D-13(1520) resonances from the CLAS data on ep -> e 'pi(+)pi(-)p. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 86, 035203-035222 [10.1103/PhysRevC.86.035203].
Mokeev, V; Burkert, V; Elouadrhiri, L; Fedotov, G; Golovatch, E; Gothe, R; Ishkhanov, B; Isupov, E; Adhikari, K; Aghasyan, M; Anghinolfi, M; Avakian, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/97540
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