Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon

K. V. Dharmawardane, S. E. Kuhn, P. Bosted, Y. Prok, G. Adams, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, V. Batourine, M. Battaglieri, K. Beard, I. Bedlinskiy, M. Bektasoglu, M. Bellis & 209 others N. Benmouna, A. S. Biselli, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, A. Cazes, S. Chen, P. L. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, V. Crede, J. P. Cummings, R. De Masi, R. DeVita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, P. Dragovitsch, Michael Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, P. Eugenio, R. Fatemi, G. Fedotov, R. J. Feuerbach, T. A. Forest, H. Funsten, M. Garçon, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, E. Golovatch, A. Gonenc, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, K. Hafidi, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, M. Huertas, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, H. G. Juengst, C. Keith, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. V. Kuleshov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, Ji Li, A. C S Lima, K. Livingston, H. Lu, K. Lukashin, M. MacCormick, J. J. Manak, N. Markov, S. McAleer, B. McKinnon, J. W C McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, M. Moteabbed, J. Mueller, G. S. Mutchler, P. Nadel-Turonski, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, M. Nozar, G. V. O'Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, R. Suleiman, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, S. Tkachenko, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, L. Zana, J. Zhang, B. Zhao, Z. Zhao

Research output: Contribution to journalArticle

133 Citations (Scopus)

Abstract

We report results for the virtual photon asymmetry A1 on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton (15NH3) and deuteron (15ND3) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present Letter, we concentrate on our results for A1 (x, Q2) and the related ratio g1 / F1 (x, Q2) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q2 from 0.05 to 5.0 (GeV / c)2 and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q2-dependence of A1 (x, Q2) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A1 (x, Q2) is not strictly Q2-independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU (6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.

Original languageEnglish (US)
Pages (from-to)11-17
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume641
Issue number1
DOIs
StatePublished - Sep 28 2006

Fingerprint

deuterons
asymmetry
protons
polarization
quark models
acceptability
partons
momentum transfer
coverings
quarks
electron beams
spectrometers
scaling
energy
photons

Keywords

  • Nucleon structure
  • Spin structure functions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon. / Dharmawardane, K. V.; Kuhn, S. E.; Bosted, P.; Prok, Y.; Adams, G.; Ambrozewicz, P.; Anghinolfi, M.; Asryan, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J. P.; Baltzell, N. A.; Barrow, S.; Batourine, V.; Battaglieri, M.; Beard, K.; Bedlinskiy, I.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Biselli, A. S.; Bonner, B. E.; Bouchigny, S.; Boiarinov, S.; Bradford, R.; Branford, D.; Brooks, W. K.; Bültmann, S.; Burkert, V. D.; Butuceanu, C.; Calarco, J. R.; Careccia, S. L.; Carman, D. S.; Carnahan, B.; Cazes, A.; Chen, S.; Cole, P. L.; Collins, P.; Coltharp, P.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Crede, V.; Cummings, J. P.; De Masi, R.; DeVita, R.; De Sanctis, E.; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Deur, A.; Djalali, C.; Dodge, G. E.; Donnelly, J.; Doughty, D.; Dragovitsch, P.; Dugger, Michael; Dytman, S.; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Eugenio, P.; Fatemi, R.; Fedotov, G.; Feuerbach, R. J.; Forest, T. A.; Funsten, H.; Garçon, M.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Golovatch, E.; Gonenc, A.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guillo, M.; Guler, N.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hafidi, K.; Hakobyan, R. S.; Hardie, J.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Huertas, M.; Hyde-Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Ito, M. M.; Jenkins, D.; Jo, H. S.; Joo, K.; Juengst, H. G.; Keith, C.; Kellie, J. D.; Khandaker, M.; Kim, K. Y.; Kim, K.; Kim, W.; Klein, A.; Klein, F. J.; Klusman, M.; Kossov, M.; Kramer, L. H.; Kubarovsky, V.; Kuhn, J.; Kuleshov, S. V.; Lachniet, J.; Laget, J. M.; Langheinrich, J.; Lawrence, D.; Li, Ji; Lima, A. C S; Livingston, K.; Lu, H.; Lukashin, K.; MacCormick, M.; Manak, J. J.; Markov, N.; McAleer, S.; McKinnon, B.; McNabb, J. W C; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mibe, T.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Morand, L.; Morrow, S. A.; Moteabbed, M.; Mueller, J.; Mutchler, G. S.; Nadel-Turonski, P.; Napolitano, J.; Nasseripour, R.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niroula, M. R.; Niyazov, R. A.; Nozar, M.; O'Rielly, G. V.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Paterson, C.; Philips, S. A.; Pierce, J.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Polli, E.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Protopopescu, D.; Qin, L. M.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, Barry; Ronchetti, F.; Rosner, G.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabatié, F.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Sharabian, Y. G.; Shaw, J.; Shvedunov, N. V.; Skabelin, A. V.; Smith, E. S.; Smith, L. C.; Sober, D. I.; Stavinsky, A.; Stepanyan, S. S.; Stepanyan, S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Suleiman, R.; Taiuti, M.; Taylor, S.; Tedeschi, D. J.; Thoma, U.; Thompson, R.; Tkabladze, A.; Tkachenko, S.; Todor, L.; Tur, C.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Weinstein, L. B.; Weygand, D. P.; Williams, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yun, J.; Zana, L.; Zhang, J.; Zhao, B.; Zhao, Z.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 641, No. 1, 28.09.2006, p. 11-17.

Research output: Contribution to journalArticle

Dharmawardane, KV, Kuhn, SE, Bosted, P, Prok, Y, Adams, G, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, JP, Baltzell, NA, Barrow, S, Batourine, V, Battaglieri, M, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, AS, Bonner, BE, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, WK, Bültmann, S, Burkert, VD, Butuceanu, C, Calarco, JR, Careccia, SL, Carman, DS, Carnahan, B, Cazes, A, Chen, S, Cole, PL, Collins, P, Coltharp, P, Cords, D, Corvisiero, P, Crabb, D, Crannell, H, Crede, V, Cummings, JP, De Masi, R, DeVita, R, De Sanctis, E, Degtyarenko, PV, Denizli, H, Dennis, L, Deur, A, Djalali, C, Dodge, GE, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, OP, Egiyan, H, Egiyan, KS, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, RJ, Forest, TA, Funsten, H, Garçon, M, Gavalian, G, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Golovatch, E, Gonenc, A, Gothe, RW, Griffioen, KA, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hafidi, K, Hakobyan, RS, Hardie, J, Heddle, D, Hersman, FW, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde-Wright, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Isupov, EL, Ito, MM, Jenkins, D, Jo, HS, Joo, K, Juengst, HG, Keith, C, Kellie, JD, Khandaker, M, Kim, KY, Kim, K, Kim, W, Klein, A, Klein, FJ, Klusman, M, Kossov, M, Kramer, LH, Kubarovsky, V, Kuhn, J, Kuleshov, SV, Lachniet, J, Laget, JM, Langheinrich, J, Lawrence, D, Li, J, Lima, ACS, Livingston, K, Lu, H, Lukashin, K, MacCormick, M, Manak, JJ, Markov, N, McAleer, S, McKinnon, B, McNabb, JWC, Mecking, BA, Mestayer, MD, Meyer, CA, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, M, Miskimen, R, Mokeev, V, Morand, L, Morrow, SA, Moteabbed, M, Mueller, J, Mutchler, GS, Nadel-Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niroula, MR, Niyazov, RA, Nozar, M, O'Rielly, GV, Osipenko, M, Ostrovidov, AI, Park, K, Pasyuk, E, Paterson, C, Philips, SA, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, E, Pozdniakov, S, Preedom, BM, Price, JW, Protopopescu, D, Qin, LM, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, B, Ronchetti, F, Rosner, G, Rossi, P, Rowntree, D, Rubin, PD, Sabatié, F, Salgado, C, Santoro, JP, Sapunenko, V, Schumacher, RA, Serov, VS, Sharabian, YG, Shaw, J, Shvedunov, NV, Skabelin, AV, Smith, ES, Smith, LC, Sober, DI, Stavinsky, A, Stepanyan, SS, Stepanyan, S, Stokes, BE, Stoler, P, Strakovsky, II, Strauch, S, Suleiman, R, Taiuti, M, Taylor, S, Tedeschi, DJ, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B & Zhao, Z 2006, 'Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 641, no. 1, pp. 11-17. https://doi.org/10.1016/j.physletb.2006.08.011
Dharmawardane, K. V. ; Kuhn, S. E. ; Bosted, P. ; Prok, Y. ; Adams, G. ; Ambrozewicz, P. ; Anghinolfi, M. ; Asryan, G. ; Avakian, H. ; Bagdasaryan, H. ; Baillie, N. ; Ball, J. P. ; Baltzell, N. A. ; Barrow, S. ; Batourine, V. ; Battaglieri, M. ; Beard, K. ; Bedlinskiy, I. ; Bektasoglu, M. ; Bellis, M. ; Benmouna, N. ; Biselli, A. S. ; Bonner, B. E. ; Bouchigny, S. ; Boiarinov, S. ; Bradford, R. ; Branford, D. ; Brooks, W. K. ; Bültmann, S. ; Burkert, V. D. ; Butuceanu, C. ; Calarco, J. R. ; Careccia, S. L. ; Carman, D. S. ; Carnahan, B. ; Cazes, A. ; Chen, S. ; Cole, P. L. ; Collins, P. ; Coltharp, P. ; Cords, D. ; Corvisiero, P. ; Crabb, D. ; Crannell, H. ; Crede, V. ; Cummings, J. P. ; De Masi, R. ; DeVita, R. ; De Sanctis, E. ; Degtyarenko, P. V. ; Denizli, H. ; Dennis, L. ; Deur, A. ; Djalali, C. ; Dodge, G. E. ; Donnelly, J. ; Doughty, D. ; Dragovitsch, P. ; Dugger, Michael ; Dytman, S. ; Dzyubak, O. P. ; Egiyan, H. ; Egiyan, K. S. ; Elouadrhiri, L. ; Eugenio, P. ; Fatemi, R. ; Fedotov, G. ; Feuerbach, R. J. ; Forest, T. A. ; Funsten, H. ; Garçon, M. ; Gavalian, G. ; Gilfoyle, G. P. ; Giovanetti, K. L. ; Girod, F. X. ; Goetz, J. T. ; Golovatch, E. ; Gonenc, A. ; Gothe, R. W. ; Griffioen, K. A. ; Guidal, M. ; Guillo, M. ; Guler, N. ; Guo, L. ; Gyurjyan, V. ; Hadjidakis, C. ; Hafidi, K. ; Hakobyan, R. S. ; Hardie, J. ; Heddle, D. ; Hersman, F. W. ; Hicks, K. ; Hleiqawi, I. ; Holtrop, M. ; Huertas, M. ; Hyde-Wright, C. E. ; Ilieva, Y. ; Ireland, D. G. ; Ishkhanov, B. S. ; Isupov, E. L. ; Ito, M. M. ; Jenkins, D. ; Jo, H. S. ; Joo, K. ; Juengst, H. G. ; Keith, C. ; Kellie, J. D. ; Khandaker, M. ; Kim, K. Y. ; Kim, K. ; Kim, W. ; Klein, A. ; Klein, F. J. ; Klusman, M. ; Kossov, M. ; Kramer, L. H. ; Kubarovsky, V. ; Kuhn, J. ; Kuleshov, S. V. ; Lachniet, J. ; Laget, J. M. ; Langheinrich, J. ; Lawrence, D. ; Li, Ji ; Lima, A. C S ; Livingston, K. ; Lu, H. ; Lukashin, K. ; MacCormick, M. ; Manak, J. J. ; Markov, N. ; McAleer, S. ; McKinnon, B. ; McNabb, J. W C ; Mecking, B. A. ; Mestayer, M. D. ; Meyer, C. A. ; Mibe, T. ; Mikhailov, K. ; Minehart, R. ; Mirazita, M. ; Miskimen, R. ; Mokeev, V. ; Morand, L. ; Morrow, S. A. ; Moteabbed, M. ; Mueller, J. ; Mutchler, G. S. ; Nadel-Turonski, P. ; Napolitano, J. ; Nasseripour, R. ; Niccolai, S. ; Niculescu, G. ; Niculescu, I. ; Niczyporuk, B. B. ; Niroula, M. R. ; Niyazov, R. A. ; Nozar, M. ; O'Rielly, G. V. ; Osipenko, M. ; Ostrovidov, A. I. ; Park, K. ; Pasyuk, E. ; Paterson, C. ; Philips, S. A. ; Pierce, J. ; Pivnyuk, N. ; Pocanic, D. ; Pogorelko, O. ; Polli, E. ; Pozdniakov, S. ; Preedom, B. M. ; Price, J. W. ; Protopopescu, D. ; Qin, L. M. ; Raue, B. A. ; Riccardi, G. ; Ricco, G. ; Ripani, M. ; Ritchie, Barry ; Ronchetti, F. ; Rosner, G. ; Rossi, P. ; Rowntree, D. ; Rubin, P. D. ; Sabatié, F. ; Salgado, C. ; Santoro, J. P. ; Sapunenko, V. ; Schumacher, R. A. ; Serov, V. S. ; Sharabian, Y. G. ; Shaw, J. ; Shvedunov, N. V. ; Skabelin, A. V. ; Smith, E. S. ; Smith, L. C. ; Sober, D. I. ; Stavinsky, A. ; Stepanyan, S. S. ; Stepanyan, S. ; Stokes, B. E. ; Stoler, P. ; Strakovsky, I. I. ; Strauch, S. ; Suleiman, R. ; Taiuti, M. ; Taylor, S. ; Tedeschi, D. J. ; Thoma, U. ; Thompson, R. ; Tkabladze, A. ; Tkachenko, S. ; Todor, L. ; Tur, C. ; Ungaro, M. ; Vineyard, M. F. ; Vlassov, A. V. ; Weinstein, L. B. ; Weygand, D. P. ; Williams, M. ; Wolin, E. ; Wood, M. H. ; Yegneswaran, A. ; Yun, J. ; Zana, L. ; Zhang, J. ; Zhao, B. ; Zhao, Z. / Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2006 ; Vol. 641, No. 1. pp. 11-17.
@article{6b21e301f93e4d89ac47044e69097185,
title = "Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon",
abstract = "We report results for the virtual photon asymmetry A1 on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton (15NH3) and deuteron (15ND3) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present Letter, we concentrate on our results for A1 (x, Q2) and the related ratio g1 / F1 (x, Q2) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q2 from 0.05 to 5.0 (GeV / c)2 and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q2-dependence of A1 (x, Q2) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A1 (x, Q2) is not strictly Q2-independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU (6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.",
keywords = "Nucleon structure, Spin structure functions",
author = "Dharmawardane, {K. V.} and Kuhn, {S. E.} and P. Bosted and Y. Prok and G. Adams and P. Ambrozewicz and M. Anghinolfi and G. Asryan and H. Avakian and H. Bagdasaryan and N. Baillie and Ball, {J. P.} and Baltzell, {N. A.} and S. Barrow and V. Batourine and M. Battaglieri and K. Beard and I. Bedlinskiy and M. Bektasoglu and M. Bellis and N. Benmouna and Biselli, {A. S.} and Bonner, {B. E.} and S. Bouchigny and S. Boiarinov and R. Bradford and D. Branford and Brooks, {W. K.} and S. B{\"u}ltmann and Burkert, {V. D.} and C. Butuceanu and Calarco, {J. R.} and Careccia, {S. L.} and Carman, {D. S.} and B. Carnahan and A. Cazes and S. Chen and Cole, {P. L.} and P. Collins and P. Coltharp and D. Cords and P. Corvisiero and D. Crabb and H. Crannell and V. Crede and Cummings, {J. P.} and {De Masi}, R. and R. DeVita and {De Sanctis}, E. and Degtyarenko, {P. V.} and H. Denizli and L. Dennis and A. Deur and C. Djalali and Dodge, {G. E.} and J. Donnelly and D. Doughty and P. Dragovitsch and Michael Dugger and S. Dytman and Dzyubak, {O. P.} and H. Egiyan and Egiyan, {K. S.} and L. Elouadrhiri and P. Eugenio and R. Fatemi and G. Fedotov and Feuerbach, {R. J.} and Forest, {T. A.} and H. Funsten and M. Gar{\cc}on and G. Gavalian and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and Girod, {F. X.} and Goetz, {J. T.} and E. Golovatch and A. Gonenc and Gothe, {R. W.} and Griffioen, {K. A.} and M. Guidal and M. Guillo and N. Guler and L. Guo and V. Gyurjyan and C. Hadjidakis and K. Hafidi and Hakobyan, {R. S.} and J. Hardie and D. Heddle and Hersman, {F. W.} and K. Hicks and I. Hleiqawi and M. Holtrop and M. Huertas and Hyde-Wright, {C. E.} and Y. Ilieva and Ireland, {D. G.} and Ishkhanov, {B. S.} and Isupov, {E. L.} and Ito, {M. M.} and D. Jenkins and Jo, {H. S.} and K. Joo and Juengst, {H. G.} and C. Keith and Kellie, {J. D.} and M. Khandaker and Kim, {K. Y.} and K. Kim and W. Kim and A. Klein and Klein, {F. J.} and M. Klusman and M. Kossov and Kramer, {L. H.} and V. Kubarovsky and J. Kuhn and Kuleshov, {S. V.} and J. Lachniet and Laget, {J. M.} and J. Langheinrich and D. Lawrence and Ji Li and Lima, {A. C S} and K. Livingston and H. Lu and K. Lukashin and M. MacCormick and Manak, {J. J.} and N. Markov and S. McAleer and B. McKinnon and McNabb, {J. W C} and Mecking, {B. A.} and Mestayer, {M. D.} and Meyer, {C. A.} and T. Mibe and K. Mikhailov and R. Minehart and M. Mirazita and R. Miskimen and V. Mokeev and L. Morand and Morrow, {S. A.} and M. Moteabbed and J. Mueller and Mutchler, {G. S.} and P. Nadel-Turonski and J. Napolitano and R. Nasseripour and S. Niccolai and G. Niculescu and I. Niculescu and Niczyporuk, {B. B.} and Niroula, {M. R.} and Niyazov, {R. A.} and M. Nozar and O'Rielly, {G. V.} and M. Osipenko and Ostrovidov, {A. I.} and K. Park and E. Pasyuk and C. Paterson and Philips, {S. A.} and J. Pierce and N. Pivnyuk and D. Pocanic and O. Pogorelko and E. Polli and S. Pozdniakov and Preedom, {B. M.} and Price, {J. W.} and D. Protopopescu and Qin, {L. M.} and Raue, {B. A.} and G. Riccardi and G. Ricco and M. Ripani and Barry Ritchie and F. Ronchetti and G. Rosner and P. Rossi and D. Rowntree and Rubin, {P. D.} and F. Sabati{\'e} and C. Salgado and Santoro, {J. P.} and V. Sapunenko and Schumacher, {R. A.} and Serov, {V. S.} and Sharabian, {Y. G.} and J. Shaw and Shvedunov, {N. V.} and Skabelin, {A. V.} and Smith, {E. S.} and Smith, {L. C.} and Sober, {D. I.} and A. Stavinsky and Stepanyan, {S. S.} and S. Stepanyan and Stokes, {B. E.} and P. Stoler and Strakovsky, {I. I.} and S. Strauch and R. Suleiman and M. Taiuti and S. Taylor and Tedeschi, {D. J.} and U. Thoma and R. Thompson and A. Tkabladze and S. Tkachenko and L. Todor and C. Tur and M. Ungaro and Vineyard, {M. F.} and Vlassov, {A. V.} and Weinstein, {L. B.} and Weygand, {D. P.} and M. Williams and E. Wolin and Wood, {M. H.} and A. Yegneswaran and J. Yun and L. Zana and J. Zhang and B. Zhao and Z. Zhao",
year = "2006",
month = "9",
day = "28",
doi = "10.1016/j.physletb.2006.08.011",
language = "English (US)",
volume = "641",
pages = "11--17",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

T1 - Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon

AU - Dharmawardane, K. V.

AU - Kuhn, S. E.

AU - Bosted, P.

AU - Prok, Y.

AU - Adams, G.

AU - Ambrozewicz, P.

AU - Anghinolfi, M.

AU - Asryan, G.

AU - Avakian, H.

AU - Bagdasaryan, H.

AU - Baillie, N.

AU - Ball, J. P.

AU - Baltzell, N. A.

AU - Barrow, S.

AU - Batourine, V.

AU - Battaglieri, M.

AU - Beard, K.

AU - Bedlinskiy, I.

AU - Bektasoglu, M.

AU - Bellis, M.

AU - Benmouna, N.

AU - Biselli, A. S.

AU - Bonner, B. E.

AU - Bouchigny, S.

AU - Boiarinov, S.

AU - Bradford, R.

AU - Branford, D.

AU - Brooks, W. K.

AU - Bültmann, S.

AU - Burkert, V. D.

AU - Butuceanu, C.

AU - Calarco, J. R.

AU - Careccia, S. L.

AU - Carman, D. S.

AU - Carnahan, B.

AU - Cazes, A.

AU - Chen, S.

AU - Cole, P. L.

AU - Collins, P.

AU - Coltharp, P.

AU - Cords, D.

AU - Corvisiero, P.

AU - Crabb, D.

AU - Crannell, H.

AU - Crede, V.

AU - Cummings, J. P.

AU - De Masi, R.

AU - DeVita, R.

AU - De Sanctis, E.

AU - Degtyarenko, P. V.

AU - Denizli, H.

AU - Dennis, L.

AU - Deur, A.

AU - Djalali, C.

AU - Dodge, G. E.

AU - Donnelly, J.

AU - Doughty, D.

AU - Dragovitsch, P.

AU - Dugger, Michael

AU - Dytman, S.

AU - Dzyubak, O. P.

AU - Egiyan, H.

AU - Egiyan, K. S.

AU - Elouadrhiri, L.

AU - Eugenio, P.

AU - Fatemi, R.

AU - Fedotov, G.

AU - Feuerbach, R. J.

AU - Forest, T. A.

AU - Funsten, H.

AU - Garçon, M.

AU - Gavalian, G.

AU - Gilfoyle, G. P.

AU - Giovanetti, K. L.

AU - Girod, F. X.

AU - Goetz, J. T.

AU - Golovatch, E.

AU - Gonenc, A.

AU - Gothe, R. W.

AU - Griffioen, K. A.

AU - Guidal, M.

AU - Guillo, M.

AU - Guler, N.

AU - Guo, L.

AU - Gyurjyan, V.

AU - Hadjidakis, C.

AU - Hafidi, K.

AU - Hakobyan, R. S.

AU - Hardie, J.

AU - Heddle, D.

AU - Hersman, F. W.

AU - Hicks, K.

AU - Hleiqawi, I.

AU - Holtrop, M.

AU - Huertas, M.

AU - Hyde-Wright, C. E.

AU - Ilieva, Y.

AU - Ireland, D. G.

AU - Ishkhanov, B. S.

AU - Isupov, E. L.

AU - Ito, M. M.

AU - Jenkins, D.

AU - Jo, H. S.

AU - Joo, K.

AU - Juengst, H. G.

AU - Keith, C.

AU - Kellie, J. D.

AU - Khandaker, M.

AU - Kim, K. Y.

AU - Kim, K.

AU - Kim, W.

AU - Klein, A.

AU - Klein, F. J.

AU - Klusman, M.

AU - Kossov, M.

AU - Kramer, L. H.

AU - Kubarovsky, V.

AU - Kuhn, J.

AU - Kuleshov, S. V.

AU - Lachniet, J.

AU - Laget, J. M.

AU - Langheinrich, J.

AU - Lawrence, D.

AU - Li, Ji

AU - Lima, A. C S

AU - Livingston, K.

AU - Lu, H.

AU - Lukashin, K.

AU - MacCormick, M.

AU - Manak, J. J.

AU - Markov, N.

AU - McAleer, S.

AU - McKinnon, B.

AU - McNabb, J. W C

AU - Mecking, B. A.

AU - Mestayer, M. D.

AU - Meyer, C. A.

AU - Mibe, T.

AU - Mikhailov, K.

AU - Minehart, R.

AU - Mirazita, M.

AU - Miskimen, R.

AU - Mokeev, V.

AU - Morand, L.

AU - Morrow, S. A.

AU - Moteabbed, M.

AU - Mueller, J.

AU - Mutchler, G. S.

AU - Nadel-Turonski, P.

AU - Napolitano, J.

AU - Nasseripour, R.

AU - Niccolai, S.

AU - Niculescu, G.

AU - Niculescu, I.

AU - Niczyporuk, B. B.

AU - Niroula, M. R.

AU - Niyazov, R. A.

AU - Nozar, M.

AU - O'Rielly, G. V.

AU - Osipenko, M.

AU - Ostrovidov, A. I.

AU - Park, K.

AU - Pasyuk, E.

AU - Paterson, C.

AU - Philips, S. A.

AU - Pierce, J.

AU - Pivnyuk, N.

AU - Pocanic, D.

AU - Pogorelko, O.

AU - Polli, E.

AU - Pozdniakov, S.

AU - Preedom, B. M.

AU - Price, J. W.

AU - Protopopescu, D.

AU - Qin, L. M.

AU - Raue, B. A.

AU - Riccardi, G.

AU - Ricco, G.

AU - Ripani, M.

AU - Ritchie, Barry

AU - Ronchetti, F.

AU - Rosner, G.

AU - Rossi, P.

AU - Rowntree, D.

AU - Rubin, P. D.

AU - Sabatié, F.

AU - Salgado, C.

AU - Santoro, J. P.

AU - Sapunenko, V.

AU - Schumacher, R. A.

AU - Serov, V. S.

AU - Sharabian, Y. G.

AU - Shaw, J.

AU - Shvedunov, N. V.

AU - Skabelin, A. V.

AU - Smith, E. S.

AU - Smith, L. C.

AU - Sober, D. I.

AU - Stavinsky, A.

AU - Stepanyan, S. S.

AU - Stepanyan, S.

AU - Stokes, B. E.

AU - Stoler, P.

AU - Strakovsky, I. I.

AU - Strauch, S.

AU - Suleiman, R.

AU - Taiuti, M.

AU - Taylor, S.

AU - Tedeschi, D. J.

AU - Thoma, U.

AU - Thompson, R.

AU - Tkabladze, A.

AU - Tkachenko, S.

AU - Todor, L.

AU - Tur, C.

AU - Ungaro, M.

AU - Vineyard, M. F.

AU - Vlassov, A. V.

AU - Weinstein, L. B.

AU - Weygand, D. P.

AU - Williams, M.

AU - Wolin, E.

AU - Wood, M. H.

AU - Yegneswaran, A.

AU - Yun, J.

AU - Zana, L.

AU - Zhang, J.

AU - Zhao, B.

AU - Zhao, Z.

PY - 2006/9/28

Y1 - 2006/9/28

N2 - We report results for the virtual photon asymmetry A1 on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton (15NH3) and deuteron (15ND3) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present Letter, we concentrate on our results for A1 (x, Q2) and the related ratio g1 / F1 (x, Q2) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q2 from 0.05 to 5.0 (GeV / c)2 and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q2-dependence of A1 (x, Q2) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A1 (x, Q2) is not strictly Q2-independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU (6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.

AB - We report results for the virtual photon asymmetry A1 on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton (15NH3) and deuteron (15ND3) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present Letter, we concentrate on our results for A1 (x, Q2) and the related ratio g1 / F1 (x, Q2) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q2 from 0.05 to 5.0 (GeV / c)2 and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q2-dependence of A1 (x, Q2) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A1 (x, Q2) is not strictly Q2-independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU (6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.

KW - Nucleon structure

KW - Spin structure functions

UR - http://www.scopus.com/inward/record.url?scp=33748468962&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33748468962&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2006.08.011

DO - 10.1016/j.physletb.2006.08.011

M3 - Article

VL - 641

SP - 11

EP - 17

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 1

ER -