Beam-Recoil Polarization Measurement of π[superscript 0] Electroproduction on the Proton in the Region of the Roper Resonance
Name
PhysRevLett.119.022001.pdf
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Checksum (MD5)
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Author(s)
Štajner, S.
Achenbach, P.
Beranek, T.
Beričič, J.
Bosnar, D.
Böhm, R.
Correa, L.
Denig, A.
Distler, M. O.
Esser, A.
Alternative Title
Beam-Recoil Polarization Measurement of π0 Electroproduction on the Proton in the Region of the Roper Resonance
Date Issued
July 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Štajner, S. et al. “Beam-Recoil Polarization Measurement of π[superscript 0] Electroproduction on the Proton in the Region of the Roper Resonance.” Physical Review Letters 119.2 (2017): n. pag. © 2017 American Physical Society
Version
Final published version
Abstract
The helicity-dependent recoil proton polarizations P[superscript '][subscript x] and P[superscript ′][subscript z] as well as the helicity-independent component P[subscript y] have been measured in the p([→ over e],e[superscript ′][→ over p])π[superscript 0] reaction at four-momentum transfer Q[superscript 2]≃0.1 GeV[superscript 2], center-of-mass proton emission angle θ[superscript *][subscript p]≃90°, and invariant mass W≃1440 MeV. This first precise measurement of double-polarization observables in the energy domain of the Roper resonance P[subscript 11](1440) by exploiting recoil polarimetry has allowed for the extraction of its scalar electroexcitation amplitude at an unprecedentedly low value of Q[superscript 2], establishing a powerful instrument for probing the interplay of quark and meson degrees of freedom in the nucleon.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.119.022001
