Measurement of the proton spin structure at long distances

Zheng, X.; Kühn, Sebastian Paul; Wood, M. H.; Tichelbäcker, Laura; Fedotov, G.; Raue, B. A.; Venturelli, L.; Rossi, P.; Khanal, A.; Meekins, D. G.; Mullen, C.; Nadel-Turonski, P.; Schmidt, Anne; Wei, X.; Sharabian, Y. G.; Joo, K.; Crede, V.; Stepanyan, S.; Hayward, T. B.; Briscoe, W. J.; Hakobyan, H.; Deur, A.; Lanza, L.; Drozdov, V. A.; Battaglieri, M.; Bossù, F.; Gilfoyle, G. P.; Biselli, A. S.; Joosten, S.; Amaryan, M. J.; Kang, H.; Voskanyan, H.; Hattawy, M.; Bedlinskiy, I.; Ciullo, G.; Rizzo, A.; Kubarovsky, V.; Carman, D. S.; Eugenio, P.; Guo, L.; Ungaro, M.; Watts, D. P.; Strakovsky, I. I.; Jo, H. S.; Pasyuk, E.; Benmokhtar, F.; Ilieva, Y.; Sparveris, N.; Atac, H.; Djalali, C.; Holtrop, M.; Phelps, W.; Yale, B.; Poudel, J.; Mirazita, M.; Mokeev, V.; Chetry, T.; Sulkosky, V.; Zachariou, N.; Chatagnon, P.; Ostrovidov, A. I.; Fersch, R.; Paolone, M.; Hicks, K.; Girod, F.-X.; Markov, Aleksandr; Keller, D.; Contalbrigo, M.; Ehrhart, M.; Fegan, S.; Rosner, G.; Hobart, A.; Diehl, S.; Sabatié, F.; McKinnon, B.; Giovanetti, K. L.; Long, E.; Tyler, N.; Bondì, M.; De Vita, R.; Park, K.; Kripko, A.; Pappalardo, L.; Neupane, K.; Dashyan, N.; Phillips, S. K.; Hafidi, K.; Boiarinov, S.; Kim, W.; Ritman, J.; Burkert, V. D.; Avakian, H.; Carvajal, J. C.; Klein, Felix; Zhang, Jiayuan; Slifer, K.; Zhao, Z. W.; El Fassi, L.; D’Angelo, A.; Heddle, D.; Choi, S.; Forest, T. A.; Glazier, D. I.; Adhikari, S.; MacGregor, I. J. D.; Marsicano, L.; Rowley, J.; Elouadrhiri, L.; Clark, L.; Chen, J.-P.; Holmstrom, T.; Prok, Y.; Weinstein, L. B.; Shrestha, U.; Kim, C. W.; Isupov, E. L.; Seely, M. L.; Griffioen, K. A.; El Alaoui, A.; Bianconi, A.; Brock, J.; Cole, P. L.; Salgado, C.; Strauch, S.; Bulumulla, D.; Keith, C. D.; Khandaker, M.; Lenisa, P.; Pogorelko, O.; Širca, S.; Barion, L.; Brooks, W. K.; Filippi, A.; Mascagna, V.; Dupre, R.; Ghandilyan, Y.; Niccolai, S.; Celentano, A.; Leali, M.; Defurne, M.; Gothe, R. W.; livingston, K.; Guler, N.; Osipenko, M.; Voutier, E.; Mineeva, T.; Ripani, M.; Bosted, P.; Ireland, D. G.; Adhikari, K. P.; Carlin, C.; Guidal, M.

doi:10.1038/s41567-021-01198-z

Journal Article

FZJ-2021-02109

Measurement of the proton spin structure at long distances

Zheng, X. ; Deur, A. (Corresponding author) ; Kang, H. ; Kühn, S. P. ; Ripani, M. ; Zhang, J.FZJ* ; Adhikari, K. P. ; Adhikari, S. ; Amaryan, M. J. ; Atac, H. ; Avakian, H. ; Barion, L. ; Battaglieri, M. ; Bedlinskiy, I. ; Benmokhtar, F. ; Bianconi, A. ; Biselli, A. S. ; Boiarinov, S. ; Bondì, M. ; Bossù, F. ; Bosted, P. ; Briscoe, W. J. ; Brock, J. ; Brooks, W. K. ; Bulumulla, D. ; Burkert, V. D. ; Carlin, C. ; Carman, D. S. ; Carvajal, J. C. ; Celentano, A. ; Chatagnon, P. ; Chetry, T. ; Chen, J.-P. ; Choi, S. ; Ciullo, G. ; Clark, L. ; Cole, P. L. ; Contalbrigo, M. ; Crede, V. ; D’Angelo, A. ; Dashyan, N. ; De Vita, R. ; Defurne, M. ; Diehl, S. ; Djalali, C. ; Drozdov, V. A. ; Dupre, R. ; Ehrhart, M. ; El Alaoui, A. ; El Fassi, L. ; Elouadrhiri, L. ; Eugenio, P. ; Fedotov, G. ; Fegan, S. ; Fersch, R. ; Filippi, A. ; Forest, T. A. ; Ghandilyan, Y. ; Gilfoyle, G. P. ; Giovanetti, K. L. ; Girod, F.-X. ; Glazier, D. I. ; Gothe, R. W. ; Griffioen, K. A. ; Guidal, M. ; Guler, N. ; Guo, L.FZJ* ; Hafidi, K. ; Hakobyan, H. ; Hattawy, M. ; Hayward, T. B. ; Heddle, D. ; Hicks, K. ; Hobart, A. ; Holmstrom, T. ; Holtrop, M. ; Ilieva, Y. ; Ireland, D. G. ; Isupov, E. L. ; Jo, H. S.FZJ* ; Joo, K. ; Joosten, S. ; Keith, C. D. ; Keller, D. ; Khanal, A. ; Khandaker, M. ; Kim, C. W. ; Kim, W. ; Klein, F.FZJ* ; Kripko, A. ; Kubarovsky, V. ; Lanza, L. ; Leali, M. ; Lenisa, P. ; livingston, K. ; Long, E. ; MacGregor, I. J. D. ; Markov, A. ; Marsicano, L. ; Mascagna, V. ; McKinnon, B. ; Meekins, D. G. ; Mineeva, T. ; Mirazita, M. ; Mokeev, V. ; Mullen, C. ; Nadel-Turonski, P. ; Neupane, K. ; Niccolai, S. ; Osipenko, M. ; Ostrovidov, A. I. ; Paolone, M. ; Pappalardo, L. ; Park, K. ; Pasyuk, E. ; Phelps, W. ; Phillips, S. K. ; Pogorelko, O. ; Poudel, J. ; Prok, Y. ; Raue, B. A. ; Ritman, J. (Corresponding author)FZJ* ; Rizzo, A. ; Rosner, G. ; Rossi, P. ; Rowley, J. ; Sabatié, F. ; Salgado, C. ; Schmidt, A.FZJ* ; Tichelbäcker, L. ; Seely, M. L. ; Sharabian, Y. G. ; Shrestha, U. ; Širca, S. ; Slifer, K. ; Sparveris, N. ; Stepanyan, S. ; Strakovsky, I. I. ; Strauch, S. ; Sulkosky, V. ; Tyler, N. ; Ungaro, M. ; Venturelli, L. ; Voskanyan, H. ; Voutier, E. ; Watts, D. P. ; Wei, X. ; Weinstein, L. B. ; Wood, M. H. ; Yale, B. ; Zachariou, N. ; Zhao, Z. W.

2021
Nature Publishing Group Basingstoke

Nature physics 9, 873 (2021) [10.1038/s41567-021-01198-z]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27774 doi:10.1038/s41567-021-01198-z

Abstract: Measuring the spin structure of protons and neutrons tests our understanding of how they arise from quarks and gluons, the fundamental building blocks of nuclear matter. At long distances, the coupling constant of the strong interaction becomes large, requiring non-perturbative methods to calculate quantum chromodynamics processes, such as lattice gauge theory or effective field theories. Here we report proton spin structure measurements from scattering a polarized electron beam off polarized protons. The spin-dependent cross-sections were measured at large distances, corresponding to the region of low momentum transfer squared between 0.012 and 1.0 GeV2. This kinematic range provides unique tests of chiral effective field theory predictions. Our results show that a complete description of the nucleon spin remains elusive, and call for further theoretical works, for example, in lattice quantum chromodynamics. Finally, our data extrapolated to the photon point agree with the Gerasimov–Drell–Hearn sum rule, a fundamental prediction of quantum field theory that relates the anomalous magnetic moment of the proton to its integrated spin-dependent cross-sections.

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ddc:530

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Experimentelle Hadronstruktur (IKP-1)

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Appears in the scientific report 2021

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Record created 2021-05-10, last modified 2021-06-23

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