Final COMPASS results on the deuteron spin-dependent structure function g1dand the Bjorken sum rule

C. Adolph; M. Aghasyan; R. Akhunzyanov; M. G. Alexeev; G. D. Alexeev; A. Amoroso; V. Andrieux; N. V. Anfimov; V. Anosov; K. Augsten; W. Augustyniak; A. Austregesilo; C. D.R. Azevedo; B. Badełek; F. Balestra; M. Ball; J. Barth; R. Beck; Y. Bedfer; J. Bernhard; K. Bicker; E. R. Bielert; R. Birsa; M. Bodlak; P. Bordalo; F. Bradamante; C. Braun; A. Bressan; M. Büchele; W. C. Chang; C. Chatterjee; M. Chiosso; I. Choi; S. U. Chung; A. Cicuttin; M. L. Crespo; Q. Curiel; S. Dalla Torre; S. S. Dasgupta; S. Dasgupta; O. Yu Denisov; L. Dhara; S. V. Donskov; N. Doshita; Ch Dreisbach; V. Duic; W. Dünnweber; M. Dziewiecki; A. Efremov; P. D. Eversheim; W. Eyrich; M. Faessler; A. Ferrero; M. Finger; M. Finger; H. Fischer; C. Franco; N. du Fresne von Hohenesche; J. M. Friedrich; V. Frolov; E. Fuchey; F. Gautheron; O. P. Gavrichtchouk; S. Gerassimov; J. Giarra; F. Giordano; I. Gnesi; M. Gorzellik; S. Grabmüller; A. Grasso; M. Grosse Perdekamp; B. Grube; T. Grussenmeyer; A. Guskov; F. Haas; D. Hahne; G. Hamar; D. von Harrach; F. H. Heinsius; R. Heitz; F. Herrmann; N. Horikawa; N. d'Hose; C. Y. Hsieh; S. Huber; S. Ishimoto; A. Ivanov; Yu Ivanshin; T. Iwata; V. Jary; R. Joosten; P. Jörg; E. Kabuß; A. Kerbizi; B. Ketzer; G. V. Khaustov; Yu A. Khokhlov; Yu Kisselev; F. Klein; K. Klimaszewski; J. H. Koivuniemi; V. N. Kolosov; K. Kondo; K. Königsmann; I. Konorov; V. F. Konstantinov; A. M. Kotzinian; O. M. Kouznetsov; M. Krämer; P. Kremser; F. Krinner; Z. V. Kroumchtein; Y. Kulinich; F. Kunne; K. Kurek; R. P. Kurjata; A. A. Lednev; A. Lehmann; M. Levillain; S. Levorato; Y. S. Lian; J. Lichtenstadt; R. Longo; A. Maggiora; A. Magnon; N. Makins; N. Makke; G. K. Mallot; B. Marianski; A. Martin; J. Marzec; J. Matoušek; H. Matsuda; T. Matsuda; G. V. Meshcheryakov; M. Meyer; W. Meyer; Yu V. Mikhailov; M. Mikhasenko; E. Mitrofanov; N. Mitrofanov; Y. Miyachi; A. Nagaytsev; F. Nerling; D. Neyret; J. Nový; W. D. Nowak; G. Nukazuka; A. S. Nunes; A. G. Olshevsky; I. Orlov; M. Ostrick; D. Panzieri; B. Parsamyan; S. Paul; J. C. Peng; F. Pereira; M. Pešek; D. V. Peshekhonov; N. Pierre; S. Platchkov; J. Pochodzalla; V. A. Polyakov; J. Pretz; M. Quaresma; C. Quintans; S. Ramos; C. Regali; G. Reicherz; C. Riedl; M. Roskot; N. S. Rossiyskaya; D. I. Ryabchikov; A. Rybnikov; A. Rychter; R. Salac; V. D. Samoylenko; A. Sandacz; C. Santos; S. Sarkar; I. A. Savin; T. Sawada; G. Sbrizzai; P. Schiavon; K. Schmidt; H. Schmieden; K. Schönning; E. Seder; A. Selyunin; L. Silva; L. Sinha; S. Sirtl; M. Slunecka; J. Smolik; A. Srnka; D. Steffen; M. Stolarski; O. Subrt; M. Sulc; H. Suzuki; A. Szabelski; T. Szameitat; P. Sznajder; S. Takekawa; M. Tasevsky; S. Tessaro; F. Tessarotto; F. Thibaud; A. Thiel; F. Tosello; V. Tskhay; S. Uhl; A. Vauth; J. Veloso; M. Virius; J. Vondra; S. Wallner; T. Weisrock; M. Wilfert; R. Windmolders; J. ter Wolbeek; K. Zaremba; P. Zavada; M. Zavertyaev; E. Zemlyanichkina; N. Zhuravlev; M. Ziembicki; A. Zink

doi:10.1016/j.physletb.2017.03.018

Final COMPASS results on the deuteron spin-dependent structure function g₁^dand the Bjorken sum rule

C. Adolph, M. Aghasyan, R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev, A. Amoroso, V. Andrieux, N. V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C. D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. BernhardK. Bicker, E. R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W. C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S. U. Chung, A. Cicuttin, M. L. Crespo, Q. Curiel, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, O. Yu Denisov, L. Dhara, S. V. Donskov, N. Doshita, Ch Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F. H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C. Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G. V. Khaustov, Yu A. Khokhlov, Yu Kisselev, F. Klein, K. Klimaszewski, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V. F. Konstantinov, A. M. Kotzinian, O. M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z. V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R. P. Kurjata, A. A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y. S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G. K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G. V. Meshcheryakov, M. Meyer, W. Meyer, Yu V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W. D. Nowak, G. Nukazuka, A. S. Nunes, A. G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J. C. Peng, F. Pereira, M. Pešek, D. V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N. S. Rossiyskaya, D. I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V. D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I. A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, A. Vauth, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, A. Zink

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a⁶LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)²<;Q²<100(GeV/c)²in photon virtuality, 0.004<;x<;0.7 in the Bjorken scaling variable and W>4GeV/c²in the mass of the hadronic final state. The deuteron double-spin asymmetry A₁^dand the deuteron longitudinal-spin structure function g₁^dare presented in bins of x and Q². Towards lowest accessible values of x, g₁^ddecreases and becomes consistent with zero within uncertainties. The presented finalg₁^dvalues together with the recently published final g₁^pvalues of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g₁world 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 a₀, which is identified in the MS‾renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a₀(Q²=3(GeV/c)²)=0.32±0.02_stat±0.04_syst±0.05_evol. Together with the recent results on the proton spin structure function g₁^p, the results on g₁^dconstitute the COMPASS legacy on the measurements of g₁through inclusive spin-dependent deep inelastic scattering.

Lingua originale	Inglese
pagine (da-a)	34-41
Numero di pagine	8
Rivista	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	769
DOI	https://doi.org/10.1016/j.physletb.2017.03.018
Stato di pubblicazione	Pubblicato - 10 giu 2017
Pubblicato esternamente	Sì

Accesso al documento

10.1016/j.physletb.2017.03.018

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Cita questo

Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., ... Zink, A. (2017). Final COMPASS results on the deuteron spin-dependent structure function g₁^dand the Bjorken sum rule. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 769, 34-41. https://doi.org/10.1016/j.physletb.2017.03.018

@article{d7d9353b8d5543f28e4c437cd39f2ab4,

title = "Final COMPASS results on the deuteron spin-dependent structure function g1dand the Bjorken sum rule",

abstract = "Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a6LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)2<;Q2<100(GeV/c)2in photon virtuality, 0.004<;x<;0.7 in the Bjorken scaling variable and W>4GeV/c2in the mass of the hadronic final state. The deuteron double-spin asymmetry A1dand the deuteron longitudinal-spin structure function g1dare presented in bins of x and Q2. Towards lowest accessible values of x, g1ddecreases and becomes consistent with zero within uncertainties. The presented finalg1dvalues together with the recently published final g1pvalues of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g1world 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 a0, which is identified in the MS‾renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a0(Q2=3(GeV/c)2)=0.32±0.02stat±0.04syst±0.05evol. Together with the recent results on the proton spin structure function g1p, the results on g1dconstitute the COMPASS legacy on the measurements of g1through inclusive spin-dependent deep inelastic scattering.",

keywords = "COMPASS, Deep inelastic scattering, Parton helicity distributions, Spin, Structure function",

author = "C. Adolph and M. Aghasyan and R. Akhunzyanov and Alexeev, {M. G.} and Alexeev, {G. D.} and A. Amoroso and V. Andrieux and Anfimov, {N. V.} and V. Anosov and K. Augsten and W. Augustyniak and A. Austregesilo and Azevedo, {C. D.R.} and B. Bade{\l}ek and F. Balestra and M. Ball and J. Barth and R. Beck and Y. Bedfer and J. Bernhard and K. Bicker and Bielert, {E. R.} and R. Birsa and M. Bodlak and P. Bordalo and F. Bradamante and C. Braun and A. Bressan and M. B{\"u}chele and Chang, {W. C.} and C. Chatterjee and M. Chiosso and I. Choi and Chung, {S. U.} and A. Cicuttin and Crespo, {M. L.} and Q. Curiel and {Dalla Torre}, S. and Dasgupta, {S. S.} and S. Dasgupta and Denisov, {O. Yu} and L. Dhara and Donskov, {S. V.} and N. Doshita and Ch Dreisbach and V. Duic and W. D{\"u}nnweber and M. Dziewiecki and A. Efremov and Eversheim, {P. D.} and W. Eyrich and M. Faessler and A. Ferrero and M. Finger and M. Finger and H. Fischer and C. Franco and {du Fresne von Hohenesche}, N. and Friedrich, {J. M.} and V. Frolov and E. Fuchey and F. Gautheron and Gavrichtchouk, {O. P.} and S. Gerassimov and J. Giarra and F. Giordano and I. Gnesi and M. Gorzellik and S. Grabm{\"u}ller and A. Grasso and {Grosse Perdekamp}, M. and B. Grube and T. Grussenmeyer and A. Guskov and F. Haas and D. Hahne and G. Hamar and {von Harrach}, D. and Heinsius, {F. H.} and R. Heitz and F. Herrmann and N. Horikawa and N. d'Hose and Hsieh, {C. Y.} and S. Huber and S. Ishimoto and A. Ivanov and Yu Ivanshin and T. Iwata and V. Jary and R. Joosten and P. J{\"o}rg and E. Kabu{\ss} and A. Kerbizi and B. Ketzer and Khaustov, {G. V.} and Khokhlov, {Yu A.} and Yu Kisselev and F. Klein and K. Klimaszewski and Koivuniemi, {J. H.} and Kolosov, {V. N.} and K. Kondo and K. K{\"o}nigsmann and I. Konorov and Konstantinov, {V. F.} and Kotzinian, {A. M.} and Kouznetsov, {O. M.} and M. Kr{\"a}mer and P. Kremser and F. Krinner and Kroumchtein, {Z. V.} and Y. Kulinich and F. Kunne and K. Kurek and Kurjata, {R. P.} and Lednev, {A. A.} and A. Lehmann and M. Levillain and S. Levorato and Lian, {Y. S.} and J. Lichtenstadt and R. Longo and A. Maggiora and A. Magnon and N. Makins and N. Makke and Mallot, {G. K.} and B. Marianski and A. Martin and J. Marzec and J. Matou{\v s}ek and H. Matsuda and T. Matsuda and Meshcheryakov, {G. V.} and M. Meyer and W. Meyer and Mikhailov, {Yu V.} and M. Mikhasenko and E. Mitrofanov and N. Mitrofanov and Y. Miyachi and A. Nagaytsev and F. Nerling and D. Neyret and J. Nov{\'y} and Nowak, {W. D.} and G. Nukazuka and Nunes, {A. S.} and Olshevsky, {A. G.} and I. Orlov and M. Ostrick and D. Panzieri and B. Parsamyan and S. Paul and Peng, {J. C.} and F. Pereira and M. Pe{\v s}ek and Peshekhonov, {D. V.} and N. Pierre and S. Platchkov and J. Pochodzalla and Polyakov, {V. A.} and J. Pretz and M. Quaresma and C. Quintans and S. Ramos and C. Regali and G. Reicherz and C. Riedl and M. Roskot and Rossiyskaya, {N. S.} and Ryabchikov, {D. I.} and A. Rybnikov and A. Rychter and R. Salac and Samoylenko, {V. D.} and A. Sandacz and C. Santos and S. Sarkar and Savin, {I. A.} and T. Sawada and G. Sbrizzai and P. Schiavon and K. Schmidt and H. Schmieden and K. Sch{\"o}nning and E. Seder and A. Selyunin and L. Silva and L. Sinha and S. Sirtl and M. Slunecka and J. Smolik and A. Srnka and D. Steffen and M. Stolarski and O. Subrt and M. Sulc and H. Suzuki and A. Szabelski and T. Szameitat and P. Sznajder and S. Takekawa and M. Tasevsky and S. Tessaro and F. Tessarotto and F. Thibaud and A. Thiel and F. Tosello and V. Tskhay and S. Uhl and A. Vauth and J. Veloso and M. Virius and J. Vondra and S. Wallner and T. Weisrock and M. Wilfert and R. Windmolders and {ter Wolbeek}, J. and K. Zaremba and P. Zavada and M. Zavertyaev and E. Zemlyanichkina and N. Zhuravlev and M. Ziembicki and A. Zink",

note = "Publisher Copyright: {\textcopyright} 2017 The Author(s)",

year = "2017",

month = jun,

day = "10",

doi = "10.1016/j.physletb.2017.03.018",

language = "English",

volume = "769",

pages = "34--41",

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

issn = "0370-2693",

publisher = "Elsevier",

}

Adolph, C, Aghasyan, M, Akhunzyanov, R, Alexeev, MG, Alexeev, GD, Amoroso, A, Andrieux, V, Anfimov, NV, Anosov, V, Augsten, K, Augustyniak, W, Austregesilo, A, Azevedo, CDR, Badełek, B, Balestra, F, Ball, M, Barth, J, Beck, R, Bedfer, Y, Bernhard, J, Bicker, K, Bielert, ER, Birsa, R, Bodlak, M, Bordalo, P, Bradamante, F, Braun, C, Bressan, A, Büchele, M, Chang, WC, Chatterjee, C, Chiosso, M, Choi, I, Chung, SU, Cicuttin, A, Crespo, ML, Curiel, Q, Dalla Torre, S, Dasgupta, SS, Dasgupta, S, Denisov, OY, Dhara, L, Donskov, SV, Doshita, N, Dreisbach, C, Duic, V, Dünnweber, W, Dziewiecki, M, Efremov, A, Eversheim, PD, Eyrich, W, Faessler, M, Ferrero, A, Finger, M, Finger, M, Fischer, H, Franco, C, du Fresne von Hohenesche, N, Friedrich, JM, Frolov, V, Fuchey, E, Gautheron, F, Gavrichtchouk, OP, Gerassimov, S, Giarra, J, Giordano, F, Gnesi, I, Gorzellik, M, Grabmüller, S, Grasso, A, Grosse Perdekamp, M, Grube, B, Grussenmeyer, T, Guskov, A, Haas, F, Hahne, D, Hamar, G, von Harrach, D, Heinsius, FH, Heitz, R, Herrmann, F, Horikawa, N, d'Hose, N, Hsieh, CY, Huber, S, Ishimoto, S, Ivanov, A, Ivanshin, Y, Iwata, T, Jary, V, Joosten, R, Jörg, P, Kabuß, E, Kerbizi, A, Ketzer, B, Khaustov, GV, Khokhlov, YA, Kisselev, Y, Klein, F, Klimaszewski, K, Koivuniemi, JH, Kolosov, VN, Kondo, K, Königsmann, K, Konorov, I, Konstantinov, VF, Kotzinian, AM, Kouznetsov, OM, Krämer, M, Kremser, P, Krinner, F, Kroumchtein, ZV, Kulinich, Y, Kunne, F, Kurek, K, Kurjata, RP, Lednev, AA, Lehmann, A, Levillain, M, Levorato, S, Lian, YS, Lichtenstadt, J, Longo, R, Maggiora, A, Magnon, A, Makins, N, Makke, N, Mallot, GK, Marianski, B, Martin, A, Marzec, J, Matoušek, J, Matsuda, H, Matsuda, T, Meshcheryakov, GV, Meyer, M, Meyer, W, Mikhailov, YV, Mikhasenko, M, Mitrofanov, E, Mitrofanov, N, Miyachi, Y, Nagaytsev, A, Nerling, F, Neyret, D, Nový, J, Nowak, WD, Nukazuka, G, Nunes, AS, Olshevsky, AG, Orlov, I, Ostrick, M, Panzieri, D, Parsamyan, B, Paul, S, Peng, JC, Pereira, F, Pešek, M, Peshekhonov, DV, Pierre, N, Platchkov, S, Pochodzalla, J, Polyakov, VA, Pretz, J, Quaresma, M, Quintans, C, Ramos, S, Regali, C, Reicherz, G, Riedl, C, Roskot, M, Rossiyskaya, NS, Ryabchikov, DI, Rybnikov, A, Rychter, A, Salac, R, Samoylenko, VD, Sandacz, A, Santos, C, Sarkar, S, Savin, IA, Sawada, T, Sbrizzai, G, Schiavon, P, Schmidt, K, Schmieden, H, Schönning, K, Seder, E, Selyunin, A, Silva, L, Sinha, L, Sirtl, S, Slunecka, M, Smolik, J, Srnka, A, Steffen, D, Stolarski, M, Subrt, O, Sulc, M, Suzuki, H, Szabelski, A, Szameitat, T, Sznajder, P, Takekawa, S, Tasevsky, M, Tessaro, S, Tessarotto, F, Thibaud, F, Thiel, A, Tosello, F, Tskhay, V, Uhl, S, Vauth, A, Veloso, J, Virius, M, Vondra, J, Wallner, S, Weisrock, T, Wilfert, M, Windmolders, R, ter Wolbeek, J, Zaremba, K, Zavada, P, Zavertyaev, M, Zemlyanichkina, E, Zhuravlev, N, Ziembicki, M & Zink, A 2017, 'Final COMPASS results on the deuteron spin-dependent structure function g₁^dand the Bjorken sum rule', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 769, pagg. 34-41. https://doi.org/10.1016/j.physletb.2017.03.018

TY - JOUR

T1 - Final COMPASS results on the deuteron spin-dependent structure function g1dand the Bjorken sum rule

AU - Adolph, C.

AU - Aghasyan, M.

AU - Akhunzyanov, R.

AU - Alexeev, M. G.

AU - Alexeev, G. D.

AU - Amoroso, A.

AU - Andrieux, V.

AU - Anfimov, N. V.

AU - Anosov, V.

AU - Augsten, K.

AU - Augustyniak, W.

AU - Austregesilo, A.

AU - Azevedo, C. D.R.

AU - Badełek, B.

AU - Balestra, F.

AU - Ball, M.

AU - Barth, J.

AU - Beck, R.

AU - Bedfer, Y.

AU - Bernhard, J.

AU - Bicker, K.

AU - Bielert, E. R.

AU - Birsa, R.

AU - Bodlak, M.

AU - Bordalo, P.

AU - Bradamante, F.

AU - Braun, C.

AU - Bressan, A.

AU - Büchele, M.

AU - Chang, W. C.

AU - Chatterjee, C.

AU - Chiosso, M.

AU - Choi, I.

AU - Chung, S. U.

AU - Cicuttin, A.

AU - Crespo, M. L.

AU - Curiel, Q.

AU - Dalla Torre, S.

AU - Dasgupta, S. S.

AU - Dasgupta, S.

AU - Denisov, O. Yu

AU - Dhara, L.

AU - Donskov, S. V.

AU - Doshita, N.

AU - Dreisbach, Ch

AU - Duic, V.

AU - Dünnweber, W.

AU - Dziewiecki, M.

AU - Efremov, A.

AU - Eversheim, P. D.

AU - Eyrich, W.

AU - Faessler, M.

AU - Ferrero, A.

AU - Finger, M.

AU - Fischer, H.

AU - Franco, C.

AU - du Fresne von Hohenesche, N.

AU - Friedrich, J. M.

AU - Frolov, V.

AU - Fuchey, E.

AU - Gautheron, F.

AU - Gavrichtchouk, O. P.

AU - Gerassimov, S.

AU - Giarra, J.

AU - Giordano, F.

AU - Gnesi, I.

AU - Gorzellik, M.

AU - Grabmüller, S.

AU - Grasso, A.

AU - Grosse Perdekamp, M.

AU - Grube, B.

AU - Grussenmeyer, T.

AU - Guskov, A.

AU - Haas, F.

AU - Hahne, D.

AU - Hamar, G.

AU - von Harrach, D.

AU - Heinsius, F. H.

AU - Heitz, R.

AU - Herrmann, F.

AU - Horikawa, N.

AU - d'Hose, N.

AU - Hsieh, C. Y.

AU - Huber, S.

AU - Ishimoto, S.

AU - Ivanov, A.

AU - Ivanshin, Yu

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PY - 2017/6/10

Y1 - 2017/6/10

N2 - Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a6LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)2<;Q2<100(GeV/c)2in photon virtuality, 0.004<;x<;0.7 in the Bjorken scaling variable and W>4GeV/c2in the mass of the hadronic final state. The deuteron double-spin asymmetry A1dand the deuteron longitudinal-spin structure function g1dare presented in bins of x and Q2. Towards lowest accessible values of x, g1ddecreases and becomes consistent with zero within uncertainties. The presented finalg1dvalues together with the recently published final g1pvalues of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g1world 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 a0, which is identified in the MS‾renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a0(Q2=3(GeV/c)2)=0.32±0.02stat±0.04syst±0.05evol. Together with the recent results on the proton spin structure function g1p, the results on g1dconstitute the COMPASS legacy on the measurements of g1through inclusive spin-dependent deep inelastic scattering.

AB - Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a6LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)2<;Q2<100(GeV/c)2in photon virtuality, 0.004<;x<;0.7 in the Bjorken scaling variable and W>4GeV/c2in the mass of the hadronic final state. The deuteron double-spin asymmetry A1dand the deuteron longitudinal-spin structure function g1dare presented in bins of x and Q2. Towards lowest accessible values of x, g1ddecreases and becomes consistent with zero within uncertainties. The presented finalg1dvalues together with the recently published final g1pvalues of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g1world 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 a0, which is identified in the MS‾renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a0(Q2=3(GeV/c)2)=0.32±0.02stat±0.04syst±0.05evol. Together with the recent results on the proton spin structure function g1p, the results on g1dconstitute the COMPASS legacy on the measurements of g1through inclusive spin-dependent deep inelastic scattering.

KW - COMPASS

KW - Deep inelastic scattering

KW - Parton helicity distributions

KW - Spin

KW - Structure function

UR - http://www.scopus.com/inward/record.url?scp=85015717874&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2017.03.018

DO - 10.1016/j.physletb.2017.03.018

M3 - Article

SN - 0370-2693

VL - 769

SP - 34

EP - 41

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

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