| Article | |
| Report number | arXiv:1612.00620 ; CERN-EP-2016-299 |
| Title | Final COMPASS results on the deuteron spin-dependent structure function $g_1^{\rm d}$ and the Bjorken sum rule |
| Author(s) |
Adolph, C. (U. Erlangen-Nuremberg (main)) ; Aghasyan, M. (INFN, Trieste) ; Akhunzyanov, R. (Dubna, JINR) ; Alexeev, M.G. (Turin U.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (Turin U. ; INFN, Turin) ; Andrieux, V. (Illinois U., Urbana ; IRFU, Saclay) ; Anfimov, N.V. (Dubna, JINR) ; Anosov, V. (Dubna, JINR) ; Augsten, K. (Dubna, JINR ; CTU, Prague) ; Augustyniak, W. (NCBJ, Swierk) ; Austregesilo, A. (Munich, Tech. U.) ; Azevedo, C.D.R. (Aveiro U.) ; Badełek, B. (Warsaw U.) ; Balestra, F. (Turin U. ; INFN, Turin) ; Ball, M. (Bonn U., HISKP) ; Barth, J. (Bonn U.) ; Beck, R. (Bonn U., HISKP) ; Bedfer, Y. (IRFU, Saclay) ; Bernhard, J. (Mainz U., Inst. Kernphys. ; CERN) ; Bicker, K. (Munich, Tech. U. ; CERN) ; Bielert, E. R. (CERN) ; Birsa, R. (INFN, Trieste) ; Bodlak, M. (Charles U.) ; Bordalo, P. (LIP, Lisbon ; Lisbon, IST) ; Bradamante, F. (Trieste U. ; INFN, Trieste) ; Braun, C. (U. Erlangen-Nuremberg (main)) ; Bressan, A. (Trieste U. ; INFN, Trieste) ; Büchele, M. (Freiburg U.) ; Chang, W.-C. (Taiwan, Inst. Phys.) ; Chatterjee, C. (Matrivani Inst., Calcutta) ; Chiosso, M. (Turin U. ; INFN, Turin) ; Choi, I. (Illinois U., Urbana) ; Chung, S.-U. (Munich, Tech. U. ; Pusan Natl. U. ; Brookhaven) ; Cicuttin, A. (ICTP, Trieste ; INFN, Trieste) ; Crespo, M.L. (ICTP, Trieste ; INFN, Trieste) ; Curiel, Q. (IRFU, Saclay) ; Dalla Torre, S. (INFN, Trieste) ; Dasgupta, S.S. (Matrivani Inst., Calcutta) ; Dasgupta, S. (Trieste U. ; INFN, Trieste) ; Denisov, O.Yu. (INFN, Turin) ; Dhara, L. (Matrivani Inst., Calcutta) ; Donskov, S.V. (Kurchatov Inst., Moscow) ; Doshita, N. (Yamagata U.) ; Dreisbach, Ch. (Munich, Tech. U.) ; Duic, V. (Trieste U.) ; Dünnweber, W. (Munich, Tech. U., Universe) ; Dziewiecki, M. (Warsaw U., Inst. Radioelect.) ; Efremov, A. (Dubna, JINR) ; Eversheim, P.D. (Bonn U., HISKP) ; Eyrich, W. (U. Erlangen-Nuremberg (main)) ; Faessler, M. (Munich, Tech. U., Universe) ; Ferrero, A. (IRFU, Saclay) ; Finger, M. (Charles U.) ; Finger Jr., M. (Charles U.) ; Fischer, H. (Freiburg U.) ; Franco, C. (LIP, Lisbon) ; du Fresne von Hohenesche, N. (Mainz U., Inst. Kernphys.) ; Friedrich, J.M. (Munich, Tech. U.) ; Frolov, V. (Dubna, JINR ; CERN) ; Fuchey, E. (IRFU, Saclay) ; Gautheron, F. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gerassimov, S. (LPI, Moscow (main) ; Munich, Tech. U.) ; Giarra, J. (Mainz U., Inst. Kernphys.) ; Giordano, F. (Illinois U., Urbana) ; Gnesi, I. (Turin U. ; INFN, Turin) ; Gorzellik, M. (Freiburg U.) ; Grabmüller, S. (Munich, Tech. U.) ; Grasso, A. (Turin U. ; INFN, Turin) ; Grosse Perdekamp, M. (Illinois U., Urbana) ; Grube, B. (Munich, Tech. U.) ; Grussenmeyer, T. (Freiburg U.) ; Guskov, A. (Dubna, JINR) ; Haas, F. (Munich, Tech. U.) ; Hahne, D. (Bonn U.) ; Hamar, G. (Trieste U. ; INFN, Trieste) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Heinsius, F.H. (Freiburg U.) ; Heitz, R. (Illinois U., Urbana) ; Herrmann, F. (Freiburg U.) ; Horikawa, N. (Nagoya U. (main) ; Chubu U.) ; d'Hose, N. (IRFU, Saclay) ; Hsieh, C.-Y. (Taiwan, Inst. Phys. ; Taiwan, Natl. Central U.) ; Huber, S. (Munich, Tech. U.) ; Ishimoto, S. (Yamagata U. ; KEK, Tsukuba) ; Ivanov, A. (Turin U. ; INFN, Turin) ; Ivanshin, Yu. (Dubna, JINR) ; Iwata, T. (Yamagata U.) ; Jary, V. (CTU, Prague) ; Joosten, R. (Bonn U., HISKP) ; Jörg, P. (Freiburg U.) ; Kabuß, E. (Mainz U., Inst. Kernphys.) ; Kerbizi, A. (Trieste U. ; INFN, Trieste) ; Ketzer, B. (Bonn U., HISKP) ; Khaustov, G.V. (Kurchatov Inst., Moscow) ; Khokhlov, Yu.A. (Kurchatov Inst., Moscow ; Moscow, MIPT) ; Kisselev, Yu. (Dubna, JINR) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (NCBJ, Swierk) ; Koivuniemi, J.H. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Kolosov, V.N. (Kurchatov Inst., Moscow) ; Kondo, K. (Yamagata U.) ; Königsmann, K. (Freiburg U.) ; Konorov, I. (LPI, Moscow (main) ; Munich, Tech. U.) ; Konstantinov, V.F. (Kurchatov Inst., Moscow) ; Kotzinian, A.M. (Turin U. ; INFN, Turin) ; Kouznetsov, O.M. (Dubna, JINR) ; Krämer, M. (Munich, Tech. U.) ; Kremser, P. (Freiburg U.) ; Krinner, F. (Munich, Tech. U.) ; Kroumchtein, Z.V. (Dubna, JINR) ; Kulinich, Y. (Illinois U., Urbana) ; Kunne, F. (IRFU, Saclay) ; Kurek, K. (NCBJ, Swierk) ; Kurjata, R.P. (Warsaw U., Inst. Radioelect.) ; Lednev, A.A. (Kurchatov Inst., Moscow) ; Lehmann, A. (U. Erlangen-Nuremberg (main)) ; Levillain, M. (IRFU, Saclay) ; Levorato, S. (INFN, Trieste) ; Lian, Y.-S. (Taiwan, Inst. Phys. ; Taiwan, Natl. Kaohsiung Normal U.) ; Lichtenstadt, J. (Tel Aviv U. (main)) ; Longo, R. (Turin U. ; INFN, Turin) ; Maggiora, A. (INFN, Turin) ; Magnon, A. (Illinois U., Urbana) ; Makins, N. (Illinois U., Urbana) ; Makke, N. (Trieste U. ; INFN, Trieste) ; Mallot, G.K. (CERN) ; Marianski, B. (NCBJ, Swierk) ; Martin, A. (Trieste U. ; INFN, Trieste) ; Marzec, J. (Warsaw U., Inst. Radioelect.) ; Matoušek, J. (Charles U. ; INFN, Trieste) ; Matsuda, H. (Yamagata U.) ; Matsuda, T. (Miyazaki U.) ; Meshcheryakov, G.V. (Dubna, JINR) ; Meyer, M. (Illinois U., Urbana ; IRFU, Saclay) ; Meyer, W. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Mikhailov, Yu.V. (Kurchatov Inst., Moscow) ; Mikhasenko, M. (Bonn U., HISKP) ; Mitrofanov, E. (Dubna, JINR) ; Mitrofanov, N. (Dubna, JINR) ; Miyachi, Y. (Yamagata U.) ; Nagaytsev, A. (Dubna, JINR) ; Nerling, F. (Mainz U., Inst. Kernphys.) ; Neyret, D. (IRFU, Saclay) ; Nový, J. (CTU, Prague ; CERN) ; Nowak, W.-D. (Mainz U., Inst. Kernphys.) ; Nukazuka, G. (Yamagata U.) ; Nunes, A.S. (LIP, Lisbon) ; Olshevsky, A.G. (Dubna, JINR) ; Orlov, I. (Dubna, JINR) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Panzieri, D. (Piemonte Orientale U., Alessandria ; INFN, Turin) ; Parsamyan, B. (Turin U. ; INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Peng, J.-C. (Illinois U., Urbana) ; Pereira, F. (Aveiro U.) ; Pešek, M. (Charles U.) ; Peshekhonov, D.V. (Dubna, JINR) ; Pierre, N. (Mainz U., Inst. Kernphys. ; IRFU, Saclay) ; Platchkov, S. (IRFU, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polyakov, V.A. (Kurchatov Inst., Moscow) ; Pretz, J. (Bonn U.) ; Quaresma, M. (LIP, Lisbon) ; Quintans, C. (LIP, Lisbon) ; Ramos, S. (LIP, Lisbon ; Lisbon, IST) ; Regali, C. (Freiburg U.) ; Reicherz, G. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Riedl, C. (Illinois U., Urbana) ; Roskot, M. (Charles U.) ; Rossiyskaya, N.S. (Dubna, JINR) ; Ryabchikov, D.I. (Kurchatov Inst., Moscow) ; Rybnikov, A. (Dubna, JINR) ; Rychter, A. (Warsaw U., Inst. Radioelect.) ; Salac, R. (CTU, Prague) ; Samoylenko, V.D. (Kurchatov Inst., Moscow) ; Sandacz, A. (NCBJ, Swierk) ; Santos, C. (INFN, Trieste) ; Sarkar, S. (Matrivani Inst., Calcutta) ; Savin, I.A. (Dubna, JINR) ; Sawada, T. (Taiwan, Inst. Phys.) ; Sbrizzai, G. (Trieste U. ; INFN, Trieste) ; Schiavon, P. (Trieste U. ; INFN, Trieste) ; Schmidt, K. (Freiburg U.) ; Schmieden, H. (Bonn U.) ; Schönning, K. (CERN) ; Seder, E. (IRFU, Saclay ; INFN, Trieste) ; Selyunin, A. (Dubna, JINR) ; Silva, L. (LIP, Lisbon) ; Sinha, L. (Matrivani Inst., Calcutta) ; Sirtl, S. (Freiburg U.) ; Slunecka, M. (Dubna, JINR) ; Smolik, J. (Dubna, JINR) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Steffen, D. (CERN ; Munich, Tech. U.) ; Stolarski, M. (LIP, Lisbon) ; Subrt, O. (CERN ; CTU, Prague) ; Sulc, M. (Liberec Tech. U.) ; Suzuki, H. (Yamagata U. ; Chubu U.) ; Szabelski, A. (NCBJ, Swierk ; INFN, Trieste) ; Szameitat, T. (Freiburg U.) ; Sznajder, P. (NCBJ, Swierk) ; Takekawa, S. (Turin U. ; INFN, Turin) ; Tasevsky, M. (Dubna, JINR) ; Tessaro, S. (INFN, Trieste) ; Tessarotto, F. (INFN, Trieste) ; Thibaud, F. (IRFU, Saclay) ; Thiel, A. (Bonn U., HISKP) ; Tosello, F. (INFN, Turin) ; Tskhay, V. (LPI, Moscow (main)) ; Uhl, S. (Munich, Tech. U.) ; Vauth, A. (CERN) ; Veloso, J. (Aveiro U.) ; Virius, M. (CTU, Prague) ; Vondra, J. (CTU, Prague) ; Wallner, S. (Munich, Tech. U.) ; Weisrock, T. (Mainz U., Inst. Kernphys.) ; Wilfert, M. (Mainz U., Inst. Kernphys.) ; Windmolders, R. (Bonn U.) ; Wolbeek, J. ter (Freiburg U.) ; Zaremba, K. (Warsaw U., Inst. Radioelect.) ; Zavada, P. (Dubna, JINR) ; Zavertyaev, M. (LPI, Moscow (main)) ; Zemlyanichkina, E. (Dubna, JINR) ; Zhuravlev, N. (Dubna, JINR) ; Ziembicki, M. (Warsaw U., Inst. Radioelect.) ; Zink, A. (U. Erlangen-Nuremberg (main)) |
| Publication | 2017-06-10 |
| Imprint | 2016-12-02 |
| Number of pages | 8 |
| Note | 16 pages, 6 figures |
| In: | Phys. Lett. B 769 (2017) 34-41 |
| DOI | 10.1016/j.physletb.2017.03.018 |
| Subject category | hep-ex ; Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN SPS ; COMPASS NA58 |
| Free keywords | QCD ; polarization ; experimental results ; COMPASS ; deep inelastic scattering ; spin ; structure function ; parton helicity distributions |
| Abstract | Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a $^6$LiD target. The data were taken at $160 {\rm GeV}$ beam energy and the results are shown for the kinematic range $1 ({\rm GeV}/c)^2 < Q^2 < 100 ({\rm GeV}/c)^2$ in photon virtuality, $0.004<x<0.7$ in the Bjorken scaling variable and $W > 4 {\rm GeV}/c^2$ in the mass of the hadronic final state. The deuteron double-spin asymmetry $A_1^{\rm d}$ and the deuteron longitudinal-spin structure function $g_1^{\rm d}$ are presented in bins of $x$ and $Q^2$. Towards lowest accessible values of $x$, $g_1^{\rm d}$ decreases and becomes consistent with zero within uncertainties. The presented final $g_1^{\rm d}$ values together with the recently published final $g_1^{\rm p}$ values of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the $g_1$ world data at next-to-leading order of the strong coupling constant. In both cases, changes in central values of the resulting numbers are well within statistical uncertainties. The flavour-singlet axial charge $a_0$, {which is identified in the $\overline{\rm MS}$ renormalisation scheme with the total contribution of quark helicities to the nucleon spin}, is extracted from only the COMPASS deuteron data with negligible extrapolation uncertainty: $a_0 (Q^2 = 3 ({\rm GeV}/c)^2) = 0.32 \pm 0.02_{\rm stat} \pm0.04_{\rm syst} \pm 0.05_{\rm evol}$. Together with the recent results on the proton spin structure function $g_1^{\rm p}$, the results on $g_1^{\rm d}$ constitute the COMPASS legacy on the measurements of $g_1$ through inclusive spin-dependent deep inelastic scattering. |
| Copyright/License | arXiv nonexclusive-distrib. 1.0 preprint: © 2016-2024 CERN (License: CC-BY-4.0) publication: © 2017-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³ |
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