Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1 GeV2. I. ep→eπ+n

CLAS Collaboration

doi:10.1103/PhysRevC.95.035206

Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1 GeV2. I. ep→eπ+n

CLAS Collaboration

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

8 Scopus citations

Abstract

Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π+ electroproduction reaction γ∗p→nπ+. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic range covered is 1.1<W<3 GeV and 1<Q2<6GeV2. Results were obtained for about 6000 bins in W, Q2, cos(θ∗), and φ∗. Except at forward angles, very large target-spin asymmetries are observed over the entire W region. Reasonable agreement is found with phenomenological fits to previous data for W<1.6 GeV, but very large differences are seen at higher values of W. A generalized parton distributions (GPD)-based model is in poor agreement with the data. When combined with cross-sectional measurements, the present results provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q2, for resonances with masses as high as 2.4 GeV.

Original language	English
Article number	035206
Journal	Physical Review C
Volume	95
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.95.035206
State	Published - 20 Mar 2017

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10.1103/PhysRevC.95.035206

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@article{5299c6e1f6584e9fbef8480037283901,

title = "Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1 GeV2. I. ep→eπ+n",

abstract = "Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π+ electroproduction reaction γ∗p→nπ+. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic range covered is 1.1",

author = "{CLAS Collaboration} and Bosted, {P. E.} and Amaryan, {M. J.} and {Anefalos Pereira}, S. and H. Avakian and Badui, {R. A.} and J. Ball and Baltzell, {N. A.} and M. Battaglieri and V. Batourine and I. Bedlinskiy and Biselli, {A. S.} and Briscoe, {W. J.} and S. B{\"u}ltmann and Burkert, {V. D.} and Carman, {D. S.} and A. Celentano and S. Chandavar and G. Charles and G. Ciullo and L. Clark and L. Colaneri and Cole, {P. L.} and M. Contalbrigo and V. Crede and A. D'Angelo and {De Vita}, R. and A. Deur and {De Sanctis}, E. and C. Djalali and R. Dupre and H. Egiyan and {El Alaoui}, A. and {El Fassi}, L. and L. Elouadrhiri and P. Eugenio and E. Fanchini and G. Fedotov and A. Filippi and Fleming, {J. A.} and T. Forest and A. Fradi and N. Gevorgyan and Y. Ghandilyan and Gilfoyle, {G. P.} and Girod, {F. X.} and C. Gleason and W. Gohn and E. Golovatch and Gothe, {R. W.} and Jo, {H. S.}",

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

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doi = "10.1103/PhysRevC.95.035206",

language = "English",

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T1 - Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1 GeV2. I. ep→eπ+n

AU - CLAS Collaboration

AU - Bosted, P. E.

AU - Amaryan, M. J.

AU - Anefalos Pereira, S.

AU - Avakian, H.

AU - Badui, R. A.

AU - Ball, J.

AU - Baltzell, N. A.

AU - Battaglieri, M.

AU - Batourine, V.

AU - Bedlinskiy, I.

AU - Biselli, A. S.

AU - Briscoe, W. J.

AU - Bültmann, S.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Celentano, A.

AU - Chandavar, S.

AU - Charles, G.

AU - Ciullo, G.

AU - Clark, L.

AU - Colaneri, L.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Crede, V.

AU - D'Angelo, A.

AU - De Vita, R.

AU - Deur, A.

AU - De Sanctis, E.

AU - Djalali, C.

AU - Dupre, R.

AU - Egiyan, H.

AU - El Alaoui, A.

AU - El Fassi, L.

AU - Elouadrhiri, L.

AU - Eugenio, P.

AU - Fanchini, E.

AU - Fedotov, G.

AU - Filippi, A.

AU - Fleming, J. A.

AU - Forest, T.

AU - Fradi, A.

AU - Gevorgyan, N.

AU - Ghandilyan, Y.

AU - Gilfoyle, G. P.

AU - Girod, F. X.

AU - Gleason, C.

AU - Gohn, W.

AU - Golovatch, E.

AU - Gothe, R. W.

AU - Jo, H. S.

PY - 2017/3/20

Y1 - 2017/3/20

N2 - Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π+ electroproduction reaction γ∗p→nπ+. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic range covered is 1.1

AB - Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π+ electroproduction reaction γ∗p→nπ+. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic range covered is 1.1

UR - http://www.scopus.com/inward/record.url?scp=85016119674&partnerID=8YFLogxK

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DO - 10.1103/PhysRevC.95.035206

M3 - Article

AN - SCOPUS:85016119674

SN - 2469-9985

VL - 95

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 035206

ER -

Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1 GeV2. I. ep→eπ+n

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