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

Igor Senderovich; Brian T. Morrison; M. Dugger; Barry G. Ritchie; E. Pasyuk; R. Tucker; J. Brock; Angela Biselli

doi:10.1016/j.physletb.2016.01.044

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

Igor Senderovich
, Brian T. Morrison
, M. Dugger
, Barry G. Ritchie
, E. Pasyuk
, R. Tucker
, J. Brock
, Angela Biselli

Fairfield University

Research output: Contribution to journal › Article › peer-review

Abstract

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction . 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 Jülich–Bonn model to examine the case for the existence of a narrow ⁎ 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 from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

Original language	American English
Journal	Physics Letters B
Volume	755
DOIs	https://doi.org/10.1016/j.physletb.2016.01.044
State	Published - Jan 1 2016

Disciplines

Physical Sciences and Mathematics
Physics

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https://doi.org/10.1016/j.physletb.2016.01.044

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@article{7bb83666421b4a8fa37a32f1d738ee92,

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 . 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{\"u}lich–Bonn model to examine the case for the existence of a narrow ⁎ 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 from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.",

author = "Igor Senderovich and Morrison, \{Brian T.\} and M. Dugger and Ritchie, \{Barry G.\} and E. Pasyuk and R. Tucker and J. Brock and Angela Biselli",

year = "2016",

month = jan,

day = "1",

doi = "10.1016/j.physletb.2016.01.044",

language = "American English",

volume = "755",

journal = "Physics Letters B",

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TY - JOUR

T1 - First measurement of the helicity asymmetry E in η photoproduction on the proton.

AU - Senderovich, Igor

AU - Morrison, Brian T.

AU - Dugger, M.

AU - Ritchie, Barry G.

AU - Pasyuk, E.

AU - Tucker, R.

AU - Brock, J.

AU - Biselli, Angela

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction . 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 Jülich–Bonn model to examine the case for the existence of a narrow ⁎ 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 from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

AB - Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction . 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 Jülich–Bonn model to examine the case for the existence of a narrow ⁎ 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 from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

UR - https://digitalcommons.fairfield.edu/physics-facultypubs/154

UR - https://doi.org/10.1016/j.physletb.2016.01.044

U2 - 10.1016/j.physletb.2016.01.044

DO - 10.1016/j.physletb.2016.01.044

M3 - Article

VL - 755

JO - Physics Letters B

JF - Physics Letters B

ER -

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

Abstract

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