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

(A1 Collaboration)

doi:10.1103/PhysRevLett.119.022001

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

(A1 Collaboration)

Physics and Astronomy

Jožef Stefan Institute
Johannes Gutenberg University Mainz
University of Zagreb
IN2P3-CNRS
Technical University of Munich
University of Ljubljana
Massachusetts Institute of Technology
Tel Aviv University

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

28 Scopus citations

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.

Original language	English
Article number	022001
Journal	Physical Review Letters
Volume	119
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.119.022001
State	Published - Jul 13 2017

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10.1103/PhysRevLett.119.022001

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@article{6a66191292d444d599c8a547a837948f,

title = "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.",

author = "\{(A1 Collaboration)\} and S. {\v S}tajner and P. Achenbach and T. Beranek and J. Beri{\v c}i{\v c} and Bernauer, \{J. C.\} and D. Bosnar and R. B{\"o}hm and L. Correa and A. Denig and Distler, \{M. O.\} and A. Esser and H. Fonvieille and Friedrich, \{J. M.\} and I. Fri{\v s}{\v c}i{\'c} and S. Kegel and Y. Kohl and H. Merkel and M. Mihovilovi{\v c} and J. M{\"u}ller and U. M{\"u}ller and L. Nungesser and J. Pochodzalla and Schlimme, \{B. S.\} and M. Schoth and F. Schulz and C. Sfienti and S. {\v S}irca and M. Thiel and L. Tiator and A. Tyukin and A. Weber and I. Yaron",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = jul,

day = "13",

doi = "10.1103/PhysRevLett.119.022001",

language = "English",

volume = "119",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "2",

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TY - JOUR

T1 - Beam-Recoil Polarization Measurement of π0 Electroproduction on the Proton in the Region of the Roper Resonance

AU - (A1 Collaboration)

AU - Štajner, S.

AU - Achenbach, P.

AU - Beranek, T.

AU - Beričič, J.

AU - Bernauer, J. C.

AU - Bosnar, D.

AU - Böhm, R.

AU - Correa, L.

AU - Denig, A.

AU - Distler, M. O.

AU - Esser, A.

AU - Fonvieille, H.

AU - Friedrich, J. M.

AU - Friščić, I.

AU - Kegel, S.

AU - Kohl, Y.

AU - Merkel, H.

AU - Mihovilovič, M.

AU - Müller, J.

AU - Müller, U.

AU - Nungesser, L.

AU - Pochodzalla, J.

AU - Schlimme, B. S.

AU - Schoth, M.

AU - Schulz, F.

AU - Sfienti, C.

AU - Širca, S.

AU - Thiel, M.

AU - Tiator, L.

AU - Tyukin, A.

AU - Weber, A.

AU - Yaron, I.

PY - 2017/7/13

Y1 - 2017/7/13

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85025446276

U2 - 10.1103/PhysRevLett.119.022001

DO - 10.1103/PhysRevLett.119.022001

M3 - Article

C2 - 28753336

AN - SCOPUS:85025446276

SN - 0031-9007

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 022001

ER -

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

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