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Title: N * → Nη ' decays from photoproduction of η ' -mesons off protons

Abstract

We presented a study of the partial-wave content of the $$\gamma p\to \eta^\prime p$$ reaction in the fourth resonance region, which has been prompted by new measurements of polarization observables for that process. Using the Bonn-Gatchina partial-wave formalism, the incorporation of new data indicates that the $N(1895)1/2^-$, $N(1900)3/2^+$, $N(2100)1/2^+$, and $N(2120)3/2^-$ are the most significant contributors to the photoproduction process. Some new results for the branching ratios of the decays of these more prominent resonances to $$N\eta^\prime$$ final states are provided; such branches have not been indicated in the most recent edition of the Review of Particle Properties. Based on the analysis performed here, predictions for the helicity asymmetry $E$ for the $$\gamma p\to \eta^\prime p$$ reaction are presented.

Authors:
 [1];  [2];  [3];  [3]; ORCiD logo [4];  [1];  [3];  [1];  [5]
  1. Univ. of Bonn (Germany). Helmholtz Inst. for Radiation and Nuclear Physics; National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Arizona State Univ., Tempe, AZ (United States)
  4. Univ. of Bonn (Germany). Helmholtz Inst. for Radiation and Nuclear Physics; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  5. Univ. of Bonn (Germany). Helmholtz Inst. for Radiation and Nuclear Physics
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1365420
Alternate Identifier(s):
OSTI ID: 1389755
Report Number(s):
JLAB-PHY-17-2544; DOE/OR/23177-4214; arXiv:1706.05144
Journal ID: ISSN 0370-2693; PII: S0370269317305282
Grant/Contract Number:
SFB/TR110; 16-12-10267; PHY-1306737; AC05-06OR23177
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 772; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; baryon spectroscopy; meson photoproduction; polarization observables

Citation Formats

Anisovich, A. V., Burkert, V., Collins, P. M., Dugger, M., Klempt, E., Nikonov, V. A., Ritchie, B. G., Sarantsev, A. V., and Thoma, U. N * → Nη ' decays from photoproduction of η ' -mesons off protons. United States: N. p., 2017. Web. doi:10.1016/j.physletb.2017.06.052.
Anisovich, A. V., Burkert, V., Collins, P. M., Dugger, M., Klempt, E., Nikonov, V. A., Ritchie, B. G., Sarantsev, A. V., & Thoma, U. N * → Nη ' decays from photoproduction of η ' -mesons off protons. United States. doi:10.1016/j.physletb.2017.06.052.
Anisovich, A. V., Burkert, V., Collins, P. M., Dugger, M., Klempt, E., Nikonov, V. A., Ritchie, B. G., Sarantsev, A. V., and Thoma, U. Tue . "N * → Nη ' decays from photoproduction of η ' -mesons off protons". United States. doi:10.1016/j.physletb.2017.06.052.
@article{osti_1365420,
title = {N * → Nη ' decays from photoproduction of η ' -mesons off protons},
author = {Anisovich, A. V. and Burkert, V. and Collins, P. M. and Dugger, M. and Klempt, E. and Nikonov, V. A. and Ritchie, B. G. and Sarantsev, A. V. and Thoma, U.},
abstractNote = {We presented a study of the partial-wave content of the $\gamma p\to \eta^\prime p$ reaction in the fourth resonance region, which has been prompted by new measurements of polarization observables for that process. Using the Bonn-Gatchina partial-wave formalism, the incorporation of new data indicates that the $N(1895)1/2^-$, $N(1900)3/2^+$, $N(2100)1/2^+$, and $N(2120)3/2^-$ are the most significant contributors to the photoproduction process. Some new results for the branching ratios of the decays of these more prominent resonances to $N\eta^\prime$ final states are provided; such branches have not been indicated in the most recent edition of the Review of Particle Properties. Based on the analysis performed here, predictions for the helicity asymmetry $E$ for the $\gamma p\to \eta^\prime p$ reaction are presented.},
doi = {10.1016/j.physletb.2017.06.052},
journal = {Physics Letters. Section B},
number = C,
volume = 772,
place = {United States},
year = {Tue Jun 27 00:00:00 EDT 2017},
month = {Tue Jun 27 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2017.06.052

Citation Metrics:
Cited by: 1work
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  • We presented a study of the partial-wave content of themore » $$\gamma p\to \eta^\prime p$$ reaction in the fourth resonance region, which has been prompted by new measurements of polarization observables for that process. Using the Bonn-Gatchina partial-wave formalism, the incorporation of new data indicates that the $N(1895)1/2^-$, $N(1900)3/2^+$, $N(2100)1/2^+$, and $N(2120)3/2^-$ are the most significant contributors to the photoproduction process. Some new results for the branching ratios of the decays of these more prominent resonances to $$N\eta^\prime$$ final states are provided; such branches have not been indicated in the most recent edition of the Review of Particle Properties. Based on the analysis performed here, predictions for the helicity asymmetry $E$ for the $$\gamma p\to \eta^\prime p$$ reaction are presented.« less
  • In this paper, we analyse data on forward η -meson photoproduction off a proton target and extract the η → γγ decay width utilizing the Primakoff effect. The hadronic amplitude that enters into our analysis is strongly constrained because it is fixed from a global fit to available γp → pη data for differential cross-sections and polarizations. Finally, we compare our results with present information on the two-photon η-decay from the literature. We provide predictions for future PrimEx experiments at Jefferson Laboratory in order to motivate further studies.
  • We discuss the procedure of extracting the photoproduction cross section for neutral pseudoscalar mesons off neutrons from deuteron data. The main statement is that the final-state-interaction corrections for the proton and neutron target are in general not equal, but for π{sup 0} production there are special cases where they have to be identical and there are large regions in the parameter space of incident photon energy and pion polar angle, Θ*, where they happen to be quite similar. The corrections for both target nucleons are practically identical for π0 production in the energy range of the Δ(1232)3/2+ resonance due tomore » the specific isospin structure of this excitation. Also above the Δ-isobar range large differences between proton and neutron correction factors are only predicted for extreme forward angles (Θ* *lt; 20°), but the results are similar for larger angles. The case of η photoproduction is also briefly considered. Numerical results for the γp → π{sup 0}p and γn → π{sup 0}n correction factors are discussed. Also the model description for the available data on the differential γd → π{sup 0}pn cross sections are given.« less
  • Precise helicity-dependent cross sections and the double-polarization observable E were measured for η photoproduction from quasifree protons and neutrons bound in the deuteron. The η → 2γ and η → 3π 0 → 6γ decay modes were used to optimize the statistical quality of the data and to estimate systematic uncertainties. The measurement used the A2 detector setup at the tagged photon beam of the electron accelerator MAMI in Mainz. A longitudinally polarized deuterated butanol target was used in combination with a circularly polarized photon beam from bremsstrahlung of a longitudinally polarized electron beam. The reaction products were detected withmore » the electromagnetic calorimeters Crystal Ball and TAPS, which covered 98% of the full solid angle. The results show that the narrow structure observed earlier in the unpolarized excitation function of η photoproduction off the neutron appears only in reactions with antiparallel photon and nucleon spin (σ 1/2). It is absent for reactions with parallel spin orientation (σ 3/2) and thus very probably related to partial waves with total spin 1/2. The behavior of the angular distributions of the helicity-dependent cross sections was analyzed by fitting them with Legendre polynomials. The results are in good agreement with a model from the Bonn-Gatchina group, which uses an interference of P 11 and S 11 partial waves to explain the narrow structure.« less
    Cited by 2
  • Precise helicity-dependent cross sections and the double-polarization observable E were measured for η photoproduction from quasifree protons and neutrons bound in the deuteron. The η → 2γ and η → 3π 0 → 6γ decay modes were used to optimize the statistical quality of the data and to estimate systematic uncertainties. The measurement used the A2 detector setup at the tagged photon beam of the electron accelerator MAMI in Mainz. A longitudinally polarized deuterated butanol target was used in combination with a circularly polarized photon beam from bremsstrahlung of a longitudinally polarized electron beam. The reaction products were detected withmore » the electromagnetic calorimeters Crystal Ball and TAPS, which covered 98% of the full solid angle. The results show that the narrow structure observed earlier in the unpolarized excitation function of η photoproduction off the neutron appears only in reactions with antiparallel photon and nucleon spin (σ 1/2). It is absent for reactions with parallel spin orientation (σ 3/2) and thus very probably related to partial waves with total spin 1/2. The behavior of the angular distributions of the helicity-dependent cross sections was analyzed by fitting them with Legendre polynomials. The results are in good agreement with a model from the Bonn-Gatchina group, which uses an interference of P 11 and S 11 partial waves to explain the narrow structure.« less