Beam-Recoil Polarization Measurement of π0 Electroproduction on the Proton in the Region of the Roper Resonance

Beam-Recoil Polarization Measurement of π0 Electroproduction on the Proton in the Region of the... The helicity-dependent recoil proton polarizations Px′ and Pz′ as well as the helicity-independent component Py have been measured in the p(e→,e′p→)π0 reaction at four-momentum transfer Q2≃0.1  GeV2, center-of-mass proton emission angle θp*≃90°, and invariant mass W≃1440  MeV. This first precise measurement of double-polarization observables in the energy domain of the Roper resonance P11(1440) by exploiting recoil polarimetry has allowed for the extraction of its scalar electroexcitation amplitude at an unprecedentedly low value of Q2, establishing a powerful instrument for probing the interplay of quark and meson degrees of freedom in the nucleon. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Beam-Recoil Polarization Measurement of π0 Electroproduction on the Proton in the Region of the Roper Resonance

Abstract

The helicity-dependent recoil proton polarizations Px′ and Pz′ as well as the helicity-independent component Py have been measured in the p(e→,e′p→)π0 reaction at four-momentum transfer Q2≃0.1  GeV2, center-of-mass proton emission angle θp*≃90°, and invariant mass W≃1440  MeV. This first precise measurement of double-polarization observables in the energy domain of the Roper resonance P11(1440) by exploiting recoil polarimetry has allowed for the extraction of its scalar electroexcitation amplitude at an unprecedentedly low value of Q2, establishing a powerful instrument for probing the interplay of quark and meson degrees of freedom in the nucleon.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
0031-9007
eISSN
1079-7114
D.O.I.
10.1103/PhysRevLett.119.022001
Publisher site
See Article on Publisher Site

Abstract

The helicity-dependent recoil proton polarizations Px′ and Pz′ as well as the helicity-independent component Py have been measured in the p(e→,e′p→)π0 reaction at four-momentum transfer Q2≃0.1  GeV2, center-of-mass proton emission angle θp*≃90°, and invariant mass W≃1440  MeV. This first precise measurement of double-polarization observables in the energy domain of the Roper resonance P11(1440) by exploiting recoil polarimetry has allowed for the extraction of its scalar electroexcitation amplitude at an unprecedentedly low value of Q2, establishing a powerful instrument for probing the interplay of quark and meson degrees of freedom in the nucleon.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Jul 14, 2017

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