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Title: First measurement of the helicity asymmetry E in η photoproduction on the proton

Abstract

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γ p → η p. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the J\"ulich model to examine the case for the existence of a narrow Ν* resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable using that model. As a result, further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2]
  1. Arizona State Univ., Tempe, AZ (United States)
  2. Arizona State Univ., Tempe, AZ (United States). et al.
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:
1235968
Alternate Identifier(s):
OSTI ID: 1235997
Report Number(s):
JLAB-PHY-15-2096; DOE/OR/23177-3461; arXiv:1507.00325
Journal ID: ISSN 0370-2693
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 755; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
eta photoproduction; polarization observable; helicity asymmetry

Citation Formats

Senderovich, Igor, Morrison, Brian T., Dugger, Michael R., Ritchie, Barry G., Pasyuk, Eugene A., and Tucker, Ross J. First measurement of the helicity asymmetry E in η photoproduction on the proton. United States: N. p., 2016. Web. doi:10.1016/j.physletb.2016.01.044.
Senderovich, Igor, Morrison, Brian T., Dugger, Michael R., Ritchie, Barry G., Pasyuk, Eugene A., & Tucker, Ross J. First measurement of the helicity asymmetry E in η photoproduction on the proton. United States. doi:10.1016/j.physletb.2016.01.044.
Senderovich, Igor, Morrison, Brian T., Dugger, Michael R., Ritchie, Barry G., Pasyuk, Eugene A., and Tucker, Ross J. Tue . "First measurement of the helicity asymmetry E in η photoproduction on the proton". United States. doi:10.1016/j.physletb.2016.01.044.
@article{osti_1235968,
title = {First measurement of the helicity asymmetry E in η photoproduction on the proton},
author = {Senderovich, Igor and Morrison, Brian T. and Dugger, Michael R. and Ritchie, Barry G. and Pasyuk, Eugene A. and Tucker, Ross J.},
abstractNote = {Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γ p → η p. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the J\"ulich model to examine the case for the existence of a narrow Ν* resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable using that model. As a result, further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.},
doi = {10.1016/j.physletb.2016.01.044},
journal = {Physics Letters. Section B},
number = C,
volume = 755,
place = {United States},
year = {2016},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2016.01.044

Citation Metrics:
Cited by: 14 works
Citation information provided by
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