Moments of the spin structure functions g1p and g1d for 0.05 < Q2 < 3.0 GeV2

Y. Prok; P. Bosted; V. D. Burkert; A. Deur; K. V. Dharmawardane; G. E. Dodge; K. A. Griffioen; S. E. Kuhn; R. Minehart; G. Adams; M. J. Amaryan; M. Anghinolfi; G. Asryan; G. Audit; H. Avakian; H. Bagdasaryan; N. Baillie; J. P. Ball; N. A. Baltzell; S. Barrow; M. Battaglieri; K. Beard; I. Bedlinskiy; M. Bektasoglu; M. Bellis; N. Benmouna; B. L. Berman; A. S. Biselli; L. Blaszczyk; S. Boiarinov; B. E. Bonner; S. Bouchigny; R. Bradford; D. Branford; W. J. Briscoe; W. K. Brooks; S. Bültmann; C. Butuceanu; J. R. Calarco; S. L. Careccia; D. S. Carman; L. Casey; A. Cazes; S. Chen; L. Cheng; P. L. Cole; P. Collins; P. Coltharp; D. Cords; P. Corvisiero; D. Crabb; V. Crede; J. P. Cummings; D. Dale; N. Dashyan; R. De Masi; R. De Vita; E. De Sanctis; P. V. Degtyarenko; H. Denizli; L. Dennis; K. S. Dhuga; R. Dickson; C. Djalali; D. Doughty; M. Dugger; S. Dytman; O. P. Dzyubak; H. Egiyan; K. S. Egiyan; L. El Fassi; L. Elouadrhiri; P. Eugenio; R. Fatemi; G. Fedotov; G. Feldman; R. G. Fersh; R. J. Feuerbach; T. A. Forest; A. Fradi; H. Funsten; M. Garçon; G. Gavalian; N. Gevorgyan; G. P. Gilfoyle; K. L. Giovanetti; F. X. Girod; J. T. Goetz; E. Golovatch; R. W. Gothe; M. Guidal; M. Guillo; N. Guler; L. Guo; V. Gyurjyan; C. Hadjidakis; K. Hafidi; H. Hakobyan; C. Hanretty; J. Hardie; N. Hassall; 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; J. R. Johnstone; K. Joo; H. G. Juengst; N. Kalantarians; C. D. Keith; J. D. Kellie; M. Khandaker; K. Y. Kim; K. Kim; W. Kim; A. Klein; F. J. Klein; M. Klusman; M. Kossov; Z. Krahn; L. H. Kramer; V. Kubarovsky; J. Kuhn; S. V. Kuleshov; V. Kuznetsov; J. Lachniet; J. M. Laget; J. Langheinrich; D. Lawrence; Ji Li; A. C.S. Lima; K. Livingston; H. Y. Lu; K. Lukashin; M. MacCormick; C. Marchand; N. Markov; P. Mattione; S. McAleer; B. McKinnon; J. W.C. McNabb; B. A. Mecking; M. D. Mestayer; C. A. Meyer; T. Mibe; K. Mikhailov; M. Mirazita; R. Miskimen; V. Mokeev; L. Morand; B. Moreno; K. Moriya; S. A. Morrow; M. Moteabbed; J. Mueller; E. Munevar; G. S. Mutchler; P. Nadel-Turonski; 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. Anefalos Pereira; S. A. Philips; J. Pierce; N. Pivnyuk; D. Pocanic; O. Pogorelko; I. Popa; S. Pozdniakov; B. M. Preedom; J. W. Price; S. Procureur; D. Protopopescu; L. M. Qin; B. A. Raue; G. Riccardi; G. Ricco; M. Ripani; B. G. Ritchie; G. Rosner; P. Rossi; D. Rowntree; P. D. Rubin; F. Sabatié; J. Salamanca; C. Salgado; J. P. Santoro; V. Sapunenko; R. A. Schumacher; M. L. Seely; V. S. Serov; Y. G. Sharabian; D. Sharov; J. Shaw; N. V. Shvedunov; A. V. Skabelin; E. S. Smith; L. C. Smith; D. I. Sober; D. Sokhan; A. Stavinsky; S. S. Stepanyan; S. Stepanyan; B. E. Stokes; P. Stoler; I. I. Strakovsky; S. Strauch; R. Suleiman; M. Taiuti; D. J. Tedeschi; A. Tkabladze; S. Tkachenko; L. Todor; M. Ungaro; M. F. Vineyard; A. V. Vlassov; D. P. Watts; L. B. Weinstein; D. P. Weygand; M. Williams; E. Wolin; M. H. Wood; A. Yegneswaran; J. Yun; L. Zana; J. Zhang; B. Zhao; Z. W. Zhao

doi:10.1016/j.physletb.2008.12.063

Moments of the spin structure functions g₁^p and g₁^d for 0.05 < Q² < 3.0 GeV²

Y. Prok, P. Bosted, V. D. Burkert, A. Deur, K. V. Dharmawardane, G. E. Dodge, K. A. Griffioen, S. E. Kuhn, R. Minehart, G. Adams, M. J. Amaryan, M. Anghinolfi, G. Asryan, G. Audit, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. BarrowM. Battaglieri, K. Beard, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, L. Blaszczyk, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, L. Casey, A. Cazes, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, V. Crede, J. P. Cummings, D. Dale, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, K. S. Dhuga, R. Dickson, C. Djalali, D. Doughty, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, P. Eugenio, R. Fatemi, G. Fedotov, G. Feldman, R. G. Fersh, R. J. Feuerbach, T. A. Forest, A. Fradi, H. Funsten, M. Garçon, G. Gavalian, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, E. Golovatch, R. W. Gothe, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, C. Hanretty, J. Hardie, N. Hassall, 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, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, C. D. Keith, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. V. Kuleshov, V. Kuznetsov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, Ji Li, A. C.S. Lima, K. Livingston, H. Y. Lu, K. Lukashin, M. MacCormick, C. Marchand, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J. W.C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, 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. Anefalos Pereira, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, S. Procureur, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, J. Salamanca, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, M. L. Seely, V. S. Serov, Y. G. Sharabian, D. Sharov, J. Shaw, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, R. Suleiman, M. Taiuti, D. J. Tedeschi, A. Tkabladze, S. Tkachenko, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, L. Zana, J. Zhang, B. Zhao, Z. W. Zhao

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

74 Scopus citations

Abstract

The spin structure functions g₁ for the proton and the deuteron have been measured over a wide kinematic range in x and Q² using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH₃ and ND₃ targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q² < 5 GeV² and W < 3 GeV. The first moments of g₁ for the proton and deuteron are presented - both have a negative slope at low Q², as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ₀^p is also reported. This quantity shows strong Q² dependence at low Q². Our analysis of the Q² evolution of the first moment of g₁ shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ₀^p data and Chiral Perturbation calculations for γ₀^p, even at the lowest Q².

Original language	English
Pages (from-to)	12-16
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	672
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2008.12.063
State	Published - 9 Feb 2009

Keywords

Chiral Perturbation Theory
Nucleon structure
Spin structure functions

Access to Document

10.1016/j.physletb.2008.12.063

Cite this

Prok, Y., Bosted, P., Burkert, V. D., Deur, A., Dharmawardane, K. V., Dodge, G. E., Griffioen, K. A., Kuhn, S. E., Minehart, R., Adams, G., Amaryan, M. J., Anghinolfi, M., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J. P., Baltzell, N. A., ... Zhao, Z. W. (2009). Moments of the spin structure functions g₁^p and g₁^d for 0.05 < Q² < 3.0 GeV². Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 672(1), 12-16. https://doi.org/10.1016/j.physletb.2008.12.063

@article{36894cabe3c548bb96440c931c9285a6,

title = "Moments of the spin structure functions g1p and g1d for 0.05 < Q2 < 3.0 GeV2",

abstract = "The spin structure functions g1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q2 < 5 GeV2 and W < 3 GeV. The first moments of g1 for the proton and deuteron are presented - both have a negative slope at low Q2, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ0p is also reported. This quantity shows strong Q2 dependence at low Q2. Our analysis of the Q2 evolution of the first moment of g1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ0p data and Chiral Perturbation calculations for γ0p, even at the lowest Q2.",

keywords = "Chiral Perturbation Theory, Nucleon structure, Spin structure functions",

author = "Y. Prok and P. Bosted and Burkert, {V. D.} and A. Deur and Dharmawardane, {K. V.} and Dodge, {G. E.} and Griffioen, {K. A.} and Kuhn, {S. E.} and R. Minehart and G. Adams and Amaryan, {M. J.} and M. Anghinolfi and G. Asryan and G. Audit and H. Avakian and H. Bagdasaryan and N. Baillie and Ball, {J. P.} and Baltzell, {N. A.} and S. Barrow and M. Battaglieri and K. Beard and I. Bedlinskiy and M. Bektasoglu and M. Bellis and N. Benmouna and Berman, {B. L.} and Biselli, {A. S.} and L. Blaszczyk and S. Boiarinov and Bonner, {B. E.} and S. Bouchigny and R. Bradford and D. Branford and Briscoe, {W. J.} and Brooks, {W. K.} and S. B{\"u}ltmann and C. Butuceanu and Calarco, {J. R.} and Careccia, {S. L.} and Carman, {D. S.} and L. Casey and A. Cazes and S. Chen and L. Cheng and Cole, {P. L.} and P. Collins and P. Coltharp and D. Cords and P. Corvisiero and D. Crabb and V. Crede and Cummings, {J. P.} and D. Dale and N. Dashyan and {De Masi}, R. and {De Vita}, R. and {De Sanctis}, E. and Degtyarenko, {P. V.} and H. Denizli and L. Dennis and Dhuga, {K. S.} and R. Dickson and C. Djalali and D. Doughty and M. Dugger and S. Dytman and Dzyubak, {O. P.} and H. Egiyan and Egiyan, {K. S.} and {El Fassi}, L. and L. Elouadrhiri and P. Eugenio and R. Fatemi and G. Fedotov and G. Feldman and Fersh, {R. G.} and Feuerbach, {R. J.} and Forest, {T. A.} and A. Fradi and H. Funsten and M. Gar{\c c}on and G. Gavalian and N. Gevorgyan and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and Girod, {F. X.} and Goetz, {J. T.} and E. Golovatch and Gothe, {R. W.} and M. Guidal and M. Guillo and N. Guler and L. Guo and V. Gyurjyan and C. Hadjidakis and K. Hafidi and H. Hakobyan and C. Hanretty and J. Hardie and N. Hassall 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 Johnstone, {J. R.} and K. Joo and Juengst, {H. G.} and N. Kalantarians and Keith, {C. D.} 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 Z. Krahn and Kramer, {L. H.} and V. Kubarovsky and J. Kuhn and Kuleshov, {S. V.} and V. Kuznetsov 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 Lu, {H. Y.} and K. Lukashin and M. MacCormick and C. Marchand and N. Markov and P. Mattione 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 M. Mirazita and R. Miskimen and V. Mokeev and L. Morand and B. Moreno and K. Moriya and Morrow, {S. A.} and M. Moteabbed and J. Mueller and E. Munevar and Mutchler, {G. S.} and P. Nadel-Turonski 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 Pereira, {S. Anefalos} and Philips, {S. A.} and J. Pierce and N. Pivnyuk and D. Pocanic and O. Pogorelko and I. Popa and S. Pozdniakov and Preedom, {B. M.} and Price, {J. W.} and S. Procureur and D. Protopopescu and Qin, {L. M.} and Raue, {B. A.} and G. Riccardi and G. Ricco and M. Ripani and Ritchie, {B. G.} and G. Rosner and P. Rossi and D. Rowntree and Rubin, {P. D.} and F. Sabati{\'e} and J. Salamanca and C. Salgado and Santoro, {J. P.} and V. Sapunenko and Schumacher, {R. A.} and Seely, {M. L.} and Serov, {V. S.} and Sharabian, {Y. G.} and D. Sharov and J. Shaw and Shvedunov, {N. V.} and Skabelin, {A. V.} and Smith, {E. S.} and Smith, {L. C.} and Sober, {D. I.} and D. Sokhan 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 Tedeschi, {D. J.} and A. Tkabladze and S. Tkachenko and L. Todor and M. Ungaro and Vineyard, {M. F.} and Vlassov, {A. V.} and Watts, {D. P.} 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 Zhao, {Z. W.}",

year = "2009",

month = feb,

day = "9",

doi = "10.1016/j.physletb.2008.12.063",

language = "English",

volume = "672",

pages = "12--16",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1",

}

Prok, Y, Bosted, P, Burkert, VD, Deur, A, Dharmawardane, KV, Dodge, GE, Griffioen, KA, Kuhn, SE, Minehart, R, Adams, G, Amaryan, MJ, Anghinolfi, M, Asryan, G, Audit, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, JP, Baltzell, NA, Barrow, S, Battaglieri, M, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, BL, Biselli, AS, Blaszczyk, L, Boiarinov, S, Bonner, BE, Bouchigny, S, Bradford, R, Branford, D, Briscoe, WJ, Brooks, WK, Bültmann, S, Butuceanu, C, Calarco, JR, Careccia, SL, Carman, DS, Casey, L, Cazes, A, Chen, S, Cheng, L, Cole, PL, Collins, P, Coltharp, P, Cords, D, Corvisiero, P, Crabb, D, Crede, V, Cummings, JP, Dale, D, Dashyan, N, De Masi, R, De Vita, R, De Sanctis, E, Degtyarenko, PV, Denizli, H, Dennis, L, Dhuga, KS, Dickson, R, Djalali, C, Doughty, D, Dugger, M, Dytman, S, Dzyubak, OP, Egiyan, H, Egiyan, KS, El Fassi, L, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feldman, G, Fersh, RG, Feuerbach, RJ, Forest, TA, Fradi, A, Funsten, H, Garçon, M, Gavalian, G, Gevorgyan, N, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Golovatch, E, Gothe, RW, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hafidi, K, Hakobyan, H, Hanretty, C, Hardie, J, Hassall, N, 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, Johnstone, JR, Joo, K, Juengst, HG, Kalantarians, N, Keith, CD, Kellie, JD, Khandaker, M, Kim, KY, Kim, K, Kim, W, Klein, A, Klein, FJ, Klusman, M, Kossov, M, Krahn, Z, Kramer, LH, Kubarovsky, V, Kuhn, J, Kuleshov, SV, Kuznetsov, V, Lachniet, J, Laget, JM, Langheinrich, J, Lawrence, D, Li, J, Lima, ACS, Livingston, K, Lu, HY, Lukashin, K, MacCormick, M, Marchand, C, Markov, N, Mattione, P, McAleer, S, McKinnon, B, McNabb, JWC, Mecking, BA, Mestayer, MD, Meyer, CA, Mibe, T, Mikhailov, K, Mirazita, M, Miskimen, R, Mokeev, V, Morand, L, Moreno, B, Moriya, K, Morrow, SA, Moteabbed, M, Mueller, J, Munevar, E, Mutchler, GS, Nadel-Turonski, P, 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, Pereira, SA, Philips, SA, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Popa, I, Pozdniakov, S, Preedom, BM, Price, JW, Procureur, S, Protopopescu, D, Qin, LM, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, BG, Rosner, G, Rossi, P, Rowntree, D, Rubin, PD, Sabatié, F, Salamanca, J, Salgado, C, Santoro, JP, Sapunenko, V, Schumacher, RA, Seely, ML, Serov, VS, Sharabian, YG, Sharov, D, Shaw, J, Shvedunov, NV, Skabelin, AV, Smith, ES, Smith, LC, Sober, DI, Sokhan, D, Stavinsky, A, Stepanyan, SS, Stepanyan, S, Stokes, BE, Stoler, P, Strakovsky, II, Strauch, S, Suleiman, R, Taiuti, M, Tedeschi, DJ, Tkabladze, A, Tkachenko, S, Todor, L, Ungaro, M, Vineyard, MF, Vlassov, AV, Watts, DP, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B & Zhao, ZW 2009, 'Moments of the spin structure functions g₁^p and g₁^d for 0.05 < Q² < 3.0 GeV²', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 672, no. 1, pp. 12-16. https://doi.org/10.1016/j.physletb.2008.12.063

TY - JOUR

T1 - Moments of the spin structure functions g1p and g1d for 0.05 < Q2 < 3.0 GeV2

AU - Prok, Y.

AU - Bosted, P.

AU - Burkert, V. D.

AU - Deur, A.

AU - Dharmawardane, K. V.

AU - Dodge, G. E.

AU - Griffioen, K. A.

AU - Kuhn, S. E.

AU - Minehart, R.

AU - Adams, G.

AU - Amaryan, M. J.

AU - Anghinolfi, M.

AU - Asryan, G.

AU - Audit, G.

AU - Avakian, H.

AU - Bagdasaryan, H.

AU - Baillie, N.

AU - Ball, J. P.

AU - Baltzell, N. A.

AU - Barrow, S.

AU - Battaglieri, M.

AU - Beard, K.

AU - Bedlinskiy, I.

AU - Bektasoglu, M.

AU - Bellis, M.

AU - Benmouna, N.

AU - Berman, B. L.

AU - Biselli, A. S.

AU - Blaszczyk, L.

AU - Boiarinov, S.

AU - Bonner, B. E.

AU - Bouchigny, S.

AU - Bradford, R.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Bültmann, S.

AU - Butuceanu, C.

AU - Calarco, J. R.

AU - Careccia, S. L.

AU - Carman, D. S.

AU - Casey, L.

AU - Cazes, A.

AU - Chen, S.

AU - Cheng, L.

AU - Cole, P. L.

AU - Collins, P.

AU - Coltharp, P.

AU - Cords, D.

AU - Corvisiero, P.

AU - Crabb, D.

AU - Crede, V.

AU - Cummings, J. P.

AU - Dale, D.

AU - Dashyan, N.

AU - De Masi, R.

AU - De Vita, R.

AU - De Sanctis, E.

AU - Degtyarenko, P. V.

AU - Denizli, H.

AU - Dennis, L.

AU - Dhuga, K. S.

AU - Dickson, R.

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PY - 2009/2/9

Y1 - 2009/2/9

N2 - The spin structure functions g1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q2 < 5 GeV2 and W < 3 GeV. The first moments of g1 for the proton and deuteron are presented - both have a negative slope at low Q2, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ0p is also reported. This quantity shows strong Q2 dependence at low Q2. Our analysis of the Q2 evolution of the first moment of g1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ0p data and Chiral Perturbation calculations for γ0p, even at the lowest Q2.

AB - The spin structure functions g1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q2 < 5 GeV2 and W < 3 GeV. The first moments of g1 for the proton and deuteron are presented - both have a negative slope at low Q2, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ0p is also reported. This quantity shows strong Q2 dependence at low Q2. Our analysis of the Q2 evolution of the first moment of g1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ0p data and Chiral Perturbation calculations for γ0p, even at the lowest Q2.

KW - Chiral Perturbation Theory

KW - Nucleon structure

KW - Spin structure functions

UR - http://www.scopus.com/inward/record.url?scp=58749115196&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2008.12.063

DO - 10.1016/j.physletb.2008.12.063

M3 - Article

AN - SCOPUS:58749115196

SN - 0370-2693

VL - 672

SP - 12

EP - 16

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

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

IS - 1

ER -

Moments of the spin structure functions g₁^p and g₁^d for 0.05 < Q² < 3.0 GeV²

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