Abstract
We report on our study of {eta} photoproduction and electroproduction on the nucleon using an isobar model. The model contains nucleon Born terms and contributions from t-channel vector meson exchange as nonresonant background. In addition to the dominant S{sub 11}(1535), we also include resonance contributions from D{sub 13}(1520), S{sub 11}(1650), D{sub 15}(1675), F{sub 15}(1680), D{sub 13}(1700), P{sub 11}(1710), and P{sub 13}(1720). Within this model we analyze recent {eta} photoproduction data for differential and total cross sections, beam and target asymmetries, as well as JLab electroproduction data. Good agreement has been achieved. With the new cross section data from GRAAL [2], we show that besides the dominant S{sub 11}(1535), the second S{sub 11} resonance, S{sub 11}(1650), is required in order to extract S{sub 11}(1535) resonance parameters properly. In addition, the beam asymmetry data allow us to extract very small (<0.1%) N{sup *}{yields}{eta}N decay branching ratios of D{sub 13}(1520) and F{sub 15}(1680) resonances because of the overwhelming s-wave dominance. Finally, the Q{sup 2} dependence of S{sub 11}(1535) is extracted from two recent JLab electroproduction data. The model is implemented as a part of the MAID program.
Chiang, W -T;
Yang, S N;
[1]
Drechsel, D;
Tiator, L
[2]
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China)
- Institut fuer Kernphysik, Universitaet Mainz, 55099 Mainz (Germany)
Citation Formats
Chiang, W -T, Yang, S N, Drechsel, D, and Tiator, L.
{eta} photo- and electroproduction in an isobar model.
United States: N. p.,
2002.
Web.
doi:10.1063/1.1469959.
Chiang, W -T, Yang, S N, Drechsel, D, & Tiator, L.
{eta} photo- and electroproduction in an isobar model.
United States.
https://doi.org/10.1063/1.1469959
Chiang, W -T, Yang, S N, Drechsel, D, and Tiator, L.
2002.
"{eta} photo- and electroproduction in an isobar model."
United States.
https://doi.org/10.1063/1.1469959.
@misc{etde_20618873,
title = {{eta} photo- and electroproduction in an isobar model}
author = {Chiang, W -T, Yang, S N, Drechsel, D, and Tiator, L}
abstractNote = {We report on our study of {eta} photoproduction and electroproduction on the nucleon using an isobar model. The model contains nucleon Born terms and contributions from t-channel vector meson exchange as nonresonant background. In addition to the dominant S{sub 11}(1535), we also include resonance contributions from D{sub 13}(1520), S{sub 11}(1650), D{sub 15}(1675), F{sub 15}(1680), D{sub 13}(1700), P{sub 11}(1710), and P{sub 13}(1720). Within this model we analyze recent {eta} photoproduction data for differential and total cross sections, beam and target asymmetries, as well as JLab electroproduction data. Good agreement has been achieved. With the new cross section data from GRAAL [2], we show that besides the dominant S{sub 11}(1535), the second S{sub 11} resonance, S{sub 11}(1650), is required in order to extract S{sub 11}(1535) resonance parameters properly. In addition, the beam asymmetry data allow us to extract very small (<0.1%) N{sup *}{yields}{eta}N decay branching ratios of D{sub 13}(1520) and F{sub 15}(1680) resonances because of the overwhelming s-wave dominance. Finally, the Q{sup 2} dependence of S{sub 11}(1535) is extracted from two recent JLab electroproduction data. The model is implemented as a part of the MAID program.}
doi = {10.1063/1.1469959}
journal = []
issue = {1}
volume = {610}
journal type = {AC}
place = {United States}
year = {2002}
month = {Apr}
}
title = {{eta} photo- and electroproduction in an isobar model}
author = {Chiang, W -T, Yang, S N, Drechsel, D, and Tiator, L}
abstractNote = {We report on our study of {eta} photoproduction and electroproduction on the nucleon using an isobar model. The model contains nucleon Born terms and contributions from t-channel vector meson exchange as nonresonant background. In addition to the dominant S{sub 11}(1535), we also include resonance contributions from D{sub 13}(1520), S{sub 11}(1650), D{sub 15}(1675), F{sub 15}(1680), D{sub 13}(1700), P{sub 11}(1710), and P{sub 13}(1720). Within this model we analyze recent {eta} photoproduction data for differential and total cross sections, beam and target asymmetries, as well as JLab electroproduction data. Good agreement has been achieved. With the new cross section data from GRAAL [2], we show that besides the dominant S{sub 11}(1535), the second S{sub 11} resonance, S{sub 11}(1650), is required in order to extract S{sub 11}(1535) resonance parameters properly. In addition, the beam asymmetry data allow us to extract very small (<0.1%) N{sup *}{yields}{eta}N decay branching ratios of D{sub 13}(1520) and F{sub 15}(1680) resonances because of the overwhelming s-wave dominance. Finally, the Q{sup 2} dependence of S{sub 11}(1535) is extracted from two recent JLab electroproduction data. The model is implemented as a part of the MAID program.}
doi = {10.1063/1.1469959}
journal = []
issue = {1}
volume = {610}
journal type = {AC}
place = {United States}
year = {2002}
month = {Apr}
}