Measurement of beam-spin asymmetries for π+ electroproduction above the baryon resonance region

H. Avakian; V. D. Burkert; L. Elouadrhiri; N. Bianchi; G. Adams; A. Afanasev; P. Ambrozewicz; E. Anciant; M. Anghinolfi; D. S. Armstrong; B. Asavapibhop; G. Audit; T. Auger; H. Bagdasaryan; J. P. Bail; S. Barrow; M. Battaglieri; K. Beard; M. Bektasoglu; M. Bellis; N. Benmouna; A. S. Biselli; S. Boiarinov; B. E. Bonner; S. Bouchigny; R. Bradford; D. Branford; W. K. Brooks; C. Butuceanu; J. R. Calarco; D. S. Carman; B. Carnahan; C. Cetina; L. Ciciani; P. L. Cole; A. Coleman; D. Cords; P. Corvisiero; D. Crabb; H. Crannell; J. P. Cummings; E. DeSanctis; R. DeVita; P. V. Degtyarenko; H. Denizli; L. Dennis; K. V. Dharmawardane; C. Djalali; G. E. Dodge; D. Doughty; P. Dragovitsch; M. Dugger; S. Dytman; O. P. Dzyubak; M. Eckhause; H. Egiyan; K. S. Egiyan; A. Empl; P. Eugenio; R. Fatemi; R. J. Feuerbach; J. Ficenec; T. A. Forest; H. Funsten; S. J. Gaff; G. Gavalian; S. Gilad; G. P. Gilfoyle; K. L. Giovanetti; P. Girard; C. I.O. Gordon; K. Griffioen; M. Guidal; M. Guillo; L. Guo; V. Gyurjyan; C. Hadjidakis; R. S. Hakobyan; J. Hardie; D. Heddle; P. Heimberg; F. W. Hersman; K. Hicks; R. S. Hicks; M. Holtrop; J. Hu; C. E. Hyde-Wright; Y. Ilieva; M. M. Ito; D. Jenkins; K. Joo; J. H. Kelley; J. Kellie; M. Khandaker; D. H. Kim; K. Y. Kim; K. Kim; M. S. Kim; W. Kim

doi:10.1103/PhysRevD.69.112004

Measurement of beam-spin asymmetries for π⁺ electroproduction above the baryon resonance region

H. Avakian, V. D. Burkert, L. Elouadrhiri, N. Bianchi, G. Adams, A. Afanasev, P. Ambrozewicz, E. Anciant, M. Anghinolfi, D. S. Armstrong, B. Asavapibhop, G. Audit, T. Auger, H. Bagdasaryan, J. P. Bail, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, M. BellisN. Benmouna, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. K. Brooks, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, L. Ciciani, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. DeSanctis, R. DeVita, P. V. Degtyarenko, H. Denizli, L. Dennis, K. V. Dharmawardane, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, M. Eckhause, H. Egiyan, K. S. Egiyan, A. Empl, P. Eugenio, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, H. Funsten, S. J. Gaff, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, C. I.O. Gordon, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, M. M. Ito, D. Jenkins, K. Joo, J. H. Kelley, J. Kellie, M. Khandaker, D. H. Kim, K. Y. Kim, K. Kim, M. S. Kim, W. Kim

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156 Scopus citations

Abstract

We report the first evidence for a nonzero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic kinematic region. Data for the reaction ep→e′ π⁺X have been obtained using a polarized electron beam of 4.3 GeV with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The amplitude of the sin φ modulation increases with the momentum of the pion relative to the virtual photon, z. In the range z=0.5-0.8 the average amplitude is 0.038±0.005 ±0.003 for a missing mass M_x> 1.1 GeV and 0.037±0.007±0.004 for M_x> 1.4 GeV.

Original language	English
Article number	112004
Journal	Physical review D
Volume	69
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.69.112004
State	Published - 2004

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevD.69.112004

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Avakian, H., Burkert, V. D., Elouadrhiri, L., Bianchi, N., Adams, G., Afanasev, A., Ambrozewicz, P., Anciant, E., Anghinolfi, M., Armstrong, D. S., Asavapibhop, B., Audit, G., Auger, T., Bagdasaryan, H., Bail, J. P., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., ... Kim, W. (2004). Measurement of beam-spin asymmetries for π⁺ electroproduction above the baryon resonance region. Physical review D, 69(11), Article 112004. https://doi.org/10.1103/PhysRevD.69.112004

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title = "Measurement of beam-spin asymmetries for π+ electroproduction above the baryon resonance region",

abstract = "We report the first evidence for a nonzero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic kinematic region. Data for the reaction ep→e′ π+X have been obtained using a polarized electron beam of 4.3 GeV with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The amplitude of the sin φ modulation increases with the momentum of the pion relative to the virtual photon, z. In the range z=0.5-0.8 the average amplitude is 0.038±0.005 ±0.003 for a missing mass Mx> 1.1 GeV and 0.037±0.007±0.004 for Mx> 1.4 GeV.",

author = "H. Avakian and Burkert, {V. D.} and L. Elouadrhiri and N. Bianchi and G. Adams and A. Afanasev and P. Ambrozewicz and E. Anciant and M. Anghinolfi and Armstrong, {D. S.} and B. Asavapibhop and G. Audit and T. Auger and H. Bagdasaryan and Bail, {J. P.} and S. Barrow and M. Battaglieri and K. Beard and M. Bektasoglu and M. Bellis and N. Benmouna and Biselli, {A. S.} and S. Boiarinov and Bonner, {B. E.} and S. Bouchigny and R. Bradford and D. Branford and Brooks, {W. K.} and C. Butuceanu and Calarco, {J. R.} and Carman, {D. S.} and B. Carnahan and C. Cetina and L. Ciciani and Cole, {P. L.} and A. Coleman and D. Cords and P. Corvisiero and D. Crabb and H. Crannell and Cummings, {J. P.} and E. DeSanctis and R. DeVita and Degtyarenko, {P. V.} and H. Denizli and L. Dennis and Dharmawardane, {K. V.} and C. Djalali and Dodge, {G. E.} and D. Doughty and P. Dragovitsch and M. Dugger and S. Dytman and Dzyubak, {O. P.} and M. Eckhause and H. Egiyan and Egiyan, {K. S.} and A. Empl and P. Eugenio and R. Fatemi and Feuerbach, {R. J.} and J. Ficenec and Forest, {T. A.} and H. Funsten and Gaff, {S. J.} and G. Gavalian and S. Gilad and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and P. Girard and Gordon, {C. I.O.} and K. Griffioen and M. Guidal and M. Guillo and L. Guo and V. Gyurjyan and C. Hadjidakis and Hakobyan, {R. S.} and J. Hardie and D. Heddle and P. Heimberg and Hersman, {F. W.} and K. Hicks and Hicks, {R. S.} and M. Holtrop and J. Hu and Hyde-Wright, {C. E.} and Y. Ilieva and Ito, {M. M.} and D. Jenkins and K. Joo and Kelley, {J. H.} and J. Kellie and M. Khandaker and Kim, {D. H.} and Kim, {K. Y.} and K. Kim and Kim, {M. S.} and W. Kim",

year = "2004",

doi = "10.1103/PhysRevD.69.112004",

language = "English",

volume = "69",

number = "11",

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Avakian, H, Burkert, VD, Elouadrhiri, L, Bianchi, N, Adams, G, Afanasev, A, Ambrozewicz, P, Anciant, E, Anghinolfi, M, Armstrong, DS, Asavapibhop, B, Audit, G, Auger, T, Bagdasaryan, H, Bail, JP, Barrow, S, Battaglieri, M, Beard, K, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, AS, Boiarinov, S, Bonner, BE, Bouchigny, S, Bradford, R, Branford, D, Brooks, WK, Butuceanu, C, Calarco, JR, Carman, DS, Carnahan, B, Cetina, C, Ciciani, L, Cole, PL, Coleman, A, Cords, D, Corvisiero, P, Crabb, D, Crannell, H, Cummings, JP, DeSanctis, E, DeVita, R, Degtyarenko, PV, Denizli, H, Dennis, L, Dharmawardane, KV, Djalali, C, Dodge, GE, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, OP, Eckhause, M, Egiyan, H, Egiyan, KS, Empl, A, Eugenio, P, Fatemi, R, Feuerbach, RJ, Ficenec, J, Forest, TA, Funsten, H, Gaff, SJ, Gavalian, G, Gilad, S, Gilfoyle, GP, Giovanetti, KL, Girard, P, Gordon, CIO, Griffioen, K, Guidal, M, Guillo, M, Guo, L, Gyurjyan, V, Hadjidakis, C, Hakobyan, RS, Hardie, J, Heddle, D, Heimberg, P, Hersman, FW, Hicks, K, Hicks, RS, Holtrop, M, Hu, J, Hyde-Wright, CE, Ilieva, Y, Ito, MM, Jenkins, D, Joo, K, Kelley, JH, Kellie, J, Khandaker, M, Kim, DH, Kim, KY, Kim, K, Kim, MS & Kim, W 2004, 'Measurement of beam-spin asymmetries for π⁺ electroproduction above the baryon resonance region', Physical review D, vol. 69, no. 11, 112004. https://doi.org/10.1103/PhysRevD.69.112004

TY - JOUR

T1 - Measurement of beam-spin asymmetries for π+ electroproduction above the baryon resonance region

AU - Avakian, H.

AU - Burkert, V. D.

AU - Elouadrhiri, L.

AU - Bianchi, N.

AU - Adams, G.

AU - Afanasev, A.

AU - Ambrozewicz, P.

AU - Anciant, E.

AU - Anghinolfi, M.

AU - Armstrong, D. S.

AU - Asavapibhop, B.

AU - Audit, G.

AU - Auger, T.

AU - Bagdasaryan, H.

AU - Bail, J. P.

AU - Barrow, S.

AU - Battaglieri, M.

AU - Beard, K.

AU - Bektasoglu, M.

AU - Bellis, M.

AU - Benmouna, N.

AU - Biselli, A. S.

AU - Boiarinov, S.

AU - Bonner, B. E.

AU - Bouchigny, S.

AU - Bradford, R.

AU - Branford, D.

AU - Brooks, W. K.

AU - Butuceanu, C.

AU - Calarco, J. R.

AU - Carman, D. S.

AU - Carnahan, B.

AU - Cetina, C.

AU - Ciciani, L.

AU - Cole, P. L.

AU - Coleman, A.

AU - Cords, D.

AU - Corvisiero, P.

AU - Crabb, D.

AU - Crannell, H.

AU - Cummings, J. P.

AU - DeSanctis, E.

AU - DeVita, R.

AU - Degtyarenko, P. V.

AU - Denizli, H.

AU - Dennis, L.

AU - Dharmawardane, K. V.

AU - Djalali, C.

AU - Dodge, G. E.

AU - Doughty, D.

AU - Dragovitsch, P.

AU - Dugger, M.

AU - Dytman, S.

AU - Dzyubak, O. P.

AU - Eckhause, M.

AU - Egiyan, H.

AU - Egiyan, K. S.

AU - Empl, A.

AU - Eugenio, P.

AU - Fatemi, R.

AU - Feuerbach, R. J.

AU - Ficenec, J.

AU - Forest, T. A.

AU - Funsten, H.

AU - Gaff, S. J.

AU - Gavalian, G.

AU - Gilad, S.

AU - Gilfoyle, G. P.

AU - Giovanetti, K. L.

AU - Girard, P.

AU - Gordon, C. I.O.

AU - Griffioen, K.

AU - Guidal, M.

AU - Guillo, M.

AU - Guo, L.

AU - Gyurjyan, V.

AU - Hadjidakis, C.

AU - Hakobyan, R. S.

AU - Hardie, J.

AU - Heddle, D.

AU - Heimberg, P.

AU - Hersman, F. W.

AU - Hicks, K.

AU - Hicks, R. S.

AU - Holtrop, M.

AU - Hu, J.

AU - Hyde-Wright, C. E.

AU - Ilieva, Y.

AU - Ito, M. M.

AU - Jenkins, D.

AU - Joo, K.

AU - Kelley, J. H.

AU - Kellie, J.

AU - Khandaker, M.

AU - Kim, D. H.

AU - Kim, K. Y.

AU - Kim, K.

AU - Kim, M. S.

AU - Kim, W.

PY - 2004

Y1 - 2004

N2 - We report the first evidence for a nonzero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic kinematic region. Data for the reaction ep→e′ π+X have been obtained using a polarized electron beam of 4.3 GeV with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The amplitude of the sin φ modulation increases with the momentum of the pion relative to the virtual photon, z. In the range z=0.5-0.8 the average amplitude is 0.038±0.005 ±0.003 for a missing mass Mx> 1.1 GeV and 0.037±0.007±0.004 for Mx> 1.4 GeV.

AB - We report the first evidence for a nonzero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic kinematic region. Data for the reaction ep→e′ π+X have been obtained using a polarized electron beam of 4.3 GeV with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The amplitude of the sin φ modulation increases with the momentum of the pion relative to the virtual photon, z. In the range z=0.5-0.8 the average amplitude is 0.038±0.005 ±0.003 for a missing mass Mx> 1.1 GeV and 0.037±0.007±0.004 for Mx> 1.4 GeV.

UR - http://www.scopus.com/inward/record.url?scp=3543041847&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3543041847&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.69.112004

DO - 10.1103/PhysRevD.69.112004

M3 - Article

AN - SCOPUS:3543041847

SN - 0556-2821

VL - 69

JO - Physical review D

JF - Physical review D

IS - 11

M1 - 112004

ER -

Measurement of beam-spin asymmetries for π⁺ electroproduction above the baryon resonance region

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