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Title: Determination of the proton spin structure functions for 0.05 < Q 2 < 5 GeV 2 using CLAS

Abstract

In this work, we present the results of our final analysis of the full data set of g$$p\atop{1}$$ (Q 2), the spin structure function of the proton, collected using CLAS at Jefferson Laboratory in 2000–2001. Polarized electrons with energies of 1.6, 2.5, 4.2, and 5.7 GeV were scattered from proton targets ( 15NH 3 dynamically polarized along the beam direction) and detected with CLAS. From the measured double spin asymmetries, we extracted virtual photon asymmetries A$$p\atop{1}$$ and A$$p\atop{2}$$ and spin structure functions g$$p\atop{1}$$ and g$$p\atop{2}$$ over a wide kinematic range (0.05 GeV 2 < Q 2 < 5 GeV 2 and 1.08 GeV < W < 3 GeV) and calculated moments of g$$p\atop{1}$$. We compare our final results with various theoretical models and expectations, as well as with parametrizations of the world data. Lastly, our data, with their precision and dense kinematic coverage, are able to constrain fits of polarized parton distributions, test pQCD predictions for quark polarizations at large x, offer a better understanding of quark-hadron duality, and provide more precise values of higher twist matrix elements in the framework of the operator product expansion.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Instituto Nazionale di Fisica Nucleare (INFN)
Contributing Org.:
CLAS Collaboration
OSTI Identifier:
1416726
Alternate Identifier(s):
OSTI ID: 1414981; OSTI ID: 1421957; OSTI ID: 1439824
Report Number(s):
JLAB-PHY-17-2511; DOE/OR/23177-4185; arXiv:1706.10289
Journal ID: ISSN 2469-9985; TRN: US1800959
Grant/Contract Number:  
AC05-06OR23177; AC02-06CH11357; SC0016583
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Spin structure functions; nucleon structure; CLAS Collaboration; pion electroproduction

Citation Formats

Fersch, R. G., Guler, N., Bosted, P., Deur, A., Griffioen, K., Keith, C., Kuhn, S. E., Minehart, R., Prok, Y., Adhikari, K. P., Adhikari, S., Akbar, Z., Amaryan, M. J., Anefalos Pereira, S., Asryan, G., Avakian, H., Ball, J., Balossino, I., Baltzell, N. A., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Bültmann, S., Burkert, V. D., Thanh Cao, Frank, Carman, D. S., Careccia, S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Dodge, G. E., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T. A., Garçon, M., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Golovatch, E., Gothe, R. W., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joo, K., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lagerquist, V. G., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., McKinnon, B., Meyer, C. A., Mirazita, M., Mokeev, V., Montgomery, R. A., Movsisyan, A., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pierce, J., Pisano, S., Pogorelko, O., Price, J. W., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., and Zhang, J. Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.065208.
Fersch, R. G., Guler, N., Bosted, P., Deur, A., Griffioen, K., Keith, C., Kuhn, S. E., Minehart, R., Prok, Y., Adhikari, K. P., Adhikari, S., Akbar, Z., Amaryan, M. J., Anefalos Pereira, S., Asryan, G., Avakian, H., Ball, J., Balossino, I., Baltzell, N. A., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Bültmann, S., Burkert, V. D., Thanh Cao, Frank, Carman, D. S., Careccia, S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Dodge, G. E., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T. A., Garçon, M., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Golovatch, E., Gothe, R. W., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joo, K., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lagerquist, V. G., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., McKinnon, B., Meyer, C. A., Mirazita, M., Mokeev, V., Montgomery, R. A., Movsisyan, A., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pierce, J., Pisano, S., Pogorelko, O., Price, J. W., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., & Zhang, J. Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS. United States. doi:10.1103/PhysRevC.96.065208.
Fersch, R. G., Guler, N., Bosted, P., Deur, A., Griffioen, K., Keith, C., Kuhn, S. E., Minehart, R., Prok, Y., Adhikari, K. P., Adhikari, S., Akbar, Z., Amaryan, M. J., Anefalos Pereira, S., Asryan, G., Avakian, H., Ball, J., Balossino, I., Baltzell, N. A., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Bültmann, S., Burkert, V. D., Thanh Cao, Frank, Carman, D. S., Careccia, S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Dodge, G. E., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T. A., Garçon, M., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Golovatch, E., Gothe, R. W., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joo, K., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lagerquist, V. G., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., McKinnon, B., Meyer, C. A., Mirazita, M., Mokeev, V., Montgomery, R. A., Movsisyan, A., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pierce, J., Pisano, S., Pogorelko, O., Price, J. W., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., and Zhang, J. Wed . "Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS". United States. doi:10.1103/PhysRevC.96.065208. https://www.osti.gov/servlets/purl/1416726.
@article{osti_1416726,
title = {Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS},
author = {Fersch, R. G. and Guler, N. and Bosted, P. and Deur, A. and Griffioen, K. and Keith, C. and Kuhn, S. E. and Minehart, R. and Prok, Y. and Adhikari, K. P. and Adhikari, S. and Akbar, Z. and Amaryan, M. J. and Anefalos Pereira, S. and Asryan, G. and Avakian, H. and Ball, J. and Balossino, I. and Baltzell, N. A. and Battaglieri, M. and Bedlinskiy, I. and Biselli, A. S. and Briscoe, W. J. and Brooks, W. K. and Bültmann, S. and Burkert, V. D. and Thanh Cao, Frank and Carman, D. S. and Careccia, S. and Celentano, A. and Chandavar, S. and Charles, G. and Chetry, T. and Ciullo, G. and Clark, L. and Colaneri, L. and Cole, P. L. and Compton, N. and Contalbrigo, M. and Cortes, O. and Crede, V. and D'Angelo, A. and Dashyan, N. and De Vita, R. and De Sanctis, E. and Djalali, C. and Dodge, G. E. and Dupre, R. and Egiyan, H. and El Alaoui, A. and El Fassi, L. and Elouadrhiri, L. and Eugenio, P. and Fanchini, E. and Fedotov, G. and Filippi, A. and Fleming, J. A. and Forest, T. A. and Garçon, M. and Gavalian, G. and Ghandilyan, Y. and Gilfoyle, G. P. and Giovanetti, K. L. and Girod, F. X. and Gleason, C. and Golovatch, E. and Gothe, R. W. and Guidal, M. and Guo, L. and Hafidi, K. and Hakobyan, H. and Hanretty, C. and Harrison, N. and Hattawy, M. and Heddle, D. and Hicks, K. and Holtrop, M. and Hughes, S. M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jenkins, D. and Joo, K. and Keller, D. and Khachatryan, G. and Khachatryan, M. and Khandaker, M. and Kim, A. and Kim, W. and Klein, A. and Klein, F. J. and Kubarovsky, V. and Lagerquist, V. G. and Lanza, L. and Lenisa, P. and Livingston, K. and Lu, H. Y. and McKinnon, B. and Meyer, C. A. and Mirazita, M. and Mokeev, V. and Montgomery, R. A. and Movsisyan, A. and Munoz Camacho, C. and Murdoch, G. and Nadel-Turonski, P. and Niccolai, S. and Niculescu, G. and Niculescu, I. and Osipenko, M. and Ostrovidov, A. I. and Paolone, M. and Paremuzyan, R. and Park, K. and Pasyuk, E. and Phelps, W. and Pierce, J. and Pisano, S. and Pogorelko, O. and Price, J. W. and Protopopescu, D. and Raue, B. A. and Ripani, M. and Riser, D. and Rizzo, A. and Rosner, G. and Rossi, P. and Roy, P. and Sabatié, F. and Salgado, C. and Schumacher, R. A. and Sharabian, Y. G. and Simonyan, A. and Skorodumina, Iu. and Smith, G. D. and Sokhan, D. and Sparveris, N. and Stankovic, I. and Stepanyan, S. and Strakovsky, I. I. and Strauch, S. and Taiuti, M. and Tian, Ye and Torayev, B. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Walford, N. K. and Watts, D. P. and Wei, X. and Weinstein, L. B. and Zachariou, N. and Zhang, J.},
abstractNote = {In this work, we present the results of our final analysis of the full data set of g$p\atop{1}$ (Q2), the spin structure function of the proton, collected using CLAS at Jefferson Laboratory in 2000–2001. Polarized electrons with energies of 1.6, 2.5, 4.2, and 5.7 GeV were scattered from proton targets (15NH3 dynamically polarized along the beam direction) and detected with CLAS. From the measured double spin asymmetries, we extracted virtual photon asymmetries A$p\atop{1}$ and A$p\atop{2}$ and spin structure functions g$p\atop{1}$ and g$p\atop{2}$ over a wide kinematic range (0.05 GeV2 < Q2 < 5 GeV2 and 1.08 GeV < W < 3 GeV) and calculated moments of g$p\atop{1}$. We compare our final results with various theoretical models and expectations, as well as with parametrizations of the world data. Lastly, our data, with their precision and dense kinematic coverage, are able to constrain fits of polarized parton distributions, test pQCD predictions for quark polarizations at large x, offer a better understanding of quark-hadron duality, and provide more precise values of higher twist matrix elements in the framework of the operator product expansion.},
doi = {10.1103/PhysRevC.96.065208},
journal = {Physical Review C},
issn = {2469-9985},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

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FIG. 1 FIG. 1: An internal view of the target chamber, viewed from upstream, showing the orange transparent Kapton cylindrical LHe minicup into which the target stick was inserted. Note the metal “horn,” the source of microwave emission, on the left side.

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Spin asymmetry <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>A</mml:mi><mml:mn>1</mml:mn><mml:mi>d</mml:mi></mml:msubsup></mml:math> and the spin-dependent structure function <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>g</mml:mi><mml:mn>1</mml:mn><mml:mi>d</mml:mi></mml:msubsup></mml:math> of the deuteron at low values of x and <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>
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  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 501, Issue 2-3
  • DOI: 10.1016/S0168-9002(03)00429-7

Radiative effects in deep inelastic scattering of polarized leptons by polarized nucleons
journal, June 1983


Precision measurements of g 1 of the proton and of the deuteron with 6 GeV electrons
journal, August 2014


Valence quark spin distribution functions
journal, January 1999


Measurement of G E p / G M p in e p e p to Q 2 = 5.6 GeV 2
journal, February 2002


Deep inelastic scattering of polarized electrons by polarized He 3 and the study of the neutron spin structure
journal, December 1996


Space-charge effects on bunching of electrons in the CEBAF injector
journal, December 1997

  • Liu, H.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 400, Issue 2-3
  • DOI: 10.1016/S0168-9002(97)00960-1

Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
journal, August 2007


Measurements of d 2 n and A 1 n : Probing the neutron spin structure
journal, September 2016


The CEBAF large acceptance spectrometer (CLAS)
journal, May 2003

  • Mecking, B. A.; Adams, G.; Ahmad, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 503, Issue 3
  • DOI: 10.1016/S0168-9002(03)01001-5

The CLAS forward electromagnetic calorimeter
journal, March 2001

  • Amarian, M.; Asryan, G.; Beard, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 460, Issue 2-3
  • DOI: 10.1016/S0168-9002(00)00996-7

The CLAS Cherenkov detector
journal, June 2001

  • Adams, G.; Burkert, V.; Carl, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 465, Issue 2-3
  • DOI: 10.1016/S0168-9002(00)01313-9

Review of Particle Physics
journal, August 2014


Positivity constraints for anomalous dimensions
journal, October 1973


Moments of the spin structure functions <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>g</mml:mi><mml:mn>1</mml:mn><mml:mi>p</mml:mi></mml:msubsup></mml:math> and <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>g</mml:mi><mml:mn>1</mml:mn><mml:mi>d</mml:mi></mml:msubsup></mml:math> for <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mn>0.05</mml:mn><mml:mo><</mml:mo><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo><</mml:mo><mml:mn>3.0</mml:mn><mml:msup><mml:mtext> GeV</mml:mtext><mml:mn>2</mml:mn></mml:msup></mml:math>
journal, February 2009


On the Q2 variation of spin-dependent deep-inelastic electron-proton scattering
journal, December 1992


The Gerasimov–Drell–Hearn sum rule
journal, October 2006


Precision Measurement of the Neutron Spin Asymmetry A 1 n and Spin-Flavor Decomposition in the Valence Quark Region
journal, January 2004


An investigation of the spin structure of the proton in deep inelastic scattering of polarised muons on polarised protons
journal, December 1989


Quark-Hadron Duality in Neutron ( He 3 ) Spin Structure
journal, October 2008


Flavor decomposition of the polarized quark distributions in the nucleon from inclusive and semi-inclusive deep-inelastic scattering
journal, October 1999


An explanation of local duality and precocious scaling
journal, October 1976


The deuteron spin-dependent structure function <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>g</mml:mi><mml:mn>1</mml:mn><mml:mi>d</mml:mi></mml:msubsup></mml:math> and its first moment
journal, March 2007


QCD constraints on the shape of polarized quark and gluon distributions
journal, May 1995


Implications of the discrepancy between proton form factor measurements
journal, February 2004


Sum rules for forward virtual compton scattering
journal, February 1970


Measurements of the elastic electromagnetic form factor ratio μ p G Ep / G Mp via polarization transfer
journal, August 2001


The time-of-flight system for CLAS
journal, August 1999

  • Smith, E. S.; Carstens, T.; Distelbrink, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 432, Issue 2-3
  • DOI: 10.1016/S0168-9002(99)00484-2

Measurements of the Q2-dependence of the proton and neutron spin structure functions g1p and g1n
journal, November 2000


Target mass corrections for polarized structure functions and new sum rules
journal, July 1999


Measurement of the Proton Spin Structure Function g 1 ( x , Q 2 ) for Q 2 from 0.15 to 1.6 G e V 2 with CLAS
journal, November 2003


Experimental Determination of the Evolution of the Bjorken Integral at Low Q 2
journal, November 2004


QCD analysis of polarized deep-inelastic scattering data and parton distributions
journal, August 2002


Review of Particle Properties
journal, July 2002


Precise determination of the spin structure function g 1 of the proton, deuteron, and neutron
journal, January 2007


Electroexcitation of nucleon resonances
journal, January 2012


Precision measurement of the neutron spin asymmetries and spin-dependent structure functions in the valence quark region
journal, December 2004


Precision Determination of the Neutron Spin Structure Function g 1 n
journal, July 1997


Spin structure of the nucleon at low energies
journal, April 2003


Measurements of the proton and deuteron spin structure functions g 1 and g 2
journal, October 1998


Higher twists and color polarizabilities in the neutron
journal, May 2005


The spin structure of the nucleon
journal, April 2013

  • Aidala, Christine A.; Bass, Steven D.; Hasch, Delia
  • Reviews of Modern Physics, Vol. 85, Issue 2
  • DOI: 10.1103/RevModPhys.85.655

Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2
journal, January 2003


Solid Polarized Targets for Nuclear and Particle Physics Experiments
journal, December 1997


The statistical parton distributions: status and prospects
journal, June 2005


Corrections to nucleon spin structure asymmetries measured on nuclear polarized targets
journal, July 1999


High precision determination of the Q 2 evolution of the Bjorken sum
journal, July 2014


Q 2 Dependence of the Neutron Spin Structure Function g 2 n at Low Q 2
journal, September 2005


QCD radiative and power corrections and generalized Gerasimov-Drell-Hearn sum rules
journal, December 2004


Bethe-Heitler process in polarized photon-nucleon interactions
journal, November 1997


Nucleon spin structure and perturbative QCD frontier on the move
journal, January 2010


Pion and Nucleon Structure Functions near x = 1
journal, November 1975


Power corrections 1/Q2to parton sum rules for deep inelastic scattering from polarized nucleons
journal, June 1990


Global analysis of proton elastic form factor data with two-photon exchange corrections
journal, September 2007


Measurement of the deuteron spin structure function g1d(x) for 1 (GeV/c)2<Q2<40 (GeV/c)2
journal, September 1999


Exact Sum Rule for Nucleon Magnetic Moments
journal, May 1966


Spin asymmetries A 1 and structure functions g 1 of the proton and the deuteron from polarized high energy muon scattering
journal, October 1998


The CLAS drift chamber system
journal, July 2000

  • Mestayer, M. D.; Carman, D. S.; Asavapibhop, B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 449, Issue 1-2
  • DOI: 10.1016/S0168-9002(00)00151-0

Signatures of chiral dynamics in low-energy Compton scattering off the nucleon
journal, May 2004

  • Hildebrandt, R. P.; Grießhammer, H. W.; Hemmert, T. R.
  • The European Physical Journal A, Vol. 20, Issue 2
  • DOI: 10.1140/epja/i2003-10144-9

Moments of nucleon structure functions at next-to-leading order in baryon chiral perturbation theory
journal, November 2014


The origins of quark–hadron duality: how does the square of the sum become the sum of the squares?
journal, June 2001


Measurement of the x- and <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>-dependence of the asymmetry <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msub><mml:mi>A</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math> on the nucleon
journal, September 2006