The spin-dependent structure function of the proton g1p and a test of the Bjorken sum rule

M. G. Alekseev; V. Yu Alexakhin; Yu Alexandrov; G. D. Alexeev; A. Amoroso; A. Austregesilo; B. Badełek; F. Balestra; J. Ball; J. Barth; G. Baum; Y. Bedfer; J. Bernhard; R. Bertini; M. Bettinelli; R. Birsa; J. Bisplinghoff; P. Bordalo; F. Bradamante; A. Bravar; A. Bressan; G. Brona; E. Burtin; M. P. Bussa; D. Chaberny; D. Čotić; M. Chiosso; S. U. Chung; A. Cicuttin; M. Colantoni; M. L. Crespo; S. Dalla Torre; S. Das; S. S. Dasgupta; O. Yu Denisov; L. Dhara; V. Diaz; S. V. Donskov; N. Doshita; V. Duic; W. Dünnweber; A. Efremov; A. El Alaoui; P. D. Eversheim; W. Eyrich; M. Faessler; A. Ferrero; A. Filin; M. Finger; M. Finger; H. Fischer; C. Franco; J. M. Friedrich; R. Garfagnini; F. Gautheron; O. P. Gavrichtchouk; R. Gazda; S. Gerassimov; R. Geyer; M. Giorgi; I. Gnesi; B. Gobbo; S. Goertz; S. Grabmüller; A. Grasso; B. Grube; R. Gushterski; A. Guskov; F. Haas; D. von Harrach; T. Hasegawa; F. H. Heinsius; R. Hermann; F. Herrmann; C. Heß; F. Hinterberger; N. Horikawa; Ch Höppner; N. d'Hose; C. Ilgner; S. Ishimoto; O. Ivanov; Yu Ivanshin; T. Iwata; R. Jahn; P. Jasinski; G. Jegou; R. Joosten; E. Kabuß; W. Käfer; D. Kang; B. Ketzer; G. V. Khaustov; Yu A. Khokhlov; Yu Kisselev; F. Klein; K. Klimaszewski; S. Koblitz; J. H. Koivuniemi; V. N. Kolosov; K. Kondo; K. Königsmann; R. Konopka; I. Konorov; V. F. Konstantinov; A. Korzenev; A. M. Kotzinian; O. Kouznetsov; K. Kowalik; M. Krämer; A. Kral; Z. V. Kroumchtein; R. Kuhn; F. Kunne; K. Kurek; L. Lauser; J. M. Le Goff; A. A. Lednev; A. Lehmann; S. Levorato; J. Lichtenstadt; T. Liska; A. Maggiora; M. Maggiora; A. Magnon; G. K. Mallot; A. Mann; C. Marchand; J. Marroncle; A. Martin; J. Marzec; F. Massmann; T. Matsuda; W. Meyer; T. Michigami; Yu V. Mikhailov; M. A. Moinester; A. Mutter; A. Nagaytsev; T. Nagel; J. Nassalski; T. Negrini; F. Nerling; S. Neubert; D. Neyret; V. I. Nikolaenko; A. S. Nunes; A. G. Olshevsky; M. Ostrick; A. Padee; R. Panknin; D. Panzieri; B. Parsamyan; S. Paul; B. Pawlukiewicz-Kaminska; E. Perevalova; G. Pesaro; D. V. Peshekhonov; G. Piragino; S. Platchkov; J. Pochodzalla; J. Polak; V. A. Polyakov; G. Pontecorvo; J. Pretz; C. Quintans; J. F. Rajotte; S. Ramos; V. Rapatsky; G. Reicherz; A. Richter; F. Robinet; E. Rocco; E. Rondio; D. I. Ryabchikov; V. D. Samoylenko; A. Sandacz; H. Santos; M. G. Sapozhnikov; S. Sarkar; I. A. Savin; G. Sbrizzai; P. Schiavon; C. Schill; T. Schlüter; L. Schmitt; S. Schopferer; W. Schröder; O. Yu Shevchenko; H. W. Siebert; L. Silva; L. Sinha; A. N. Sissakian; M. Slunecka; G. I. Smirnov; S. Sosio; F. Sozzi; A. Srnka; M. Stolarski; M. Sulc; R. Sulej; S. Takekawa; S. Tessaro; F. Tessarotto; A. Teufel; L. G. Tkatchev; S. Uhl; I. Uman; M. Virius; N. V. Vlassov; A. Vossen; Q. Weitzel; R. Windmolders; W. Wiślicki; H. Wollny; K. Zaremba; M. Zavertyaev; E. Zemlyanichkina; M. Ziembicki; J. Zhao; N. Zhuravlev; A. Zvyagin

doi:10.1016/j.physletb.2010.05.069

The spin-dependent structure function of the proton g₁^p and a test of the Bjorken sum rule

M. G. Alekseev, V. Yu Alexakhin, Yu Alexandrov, G. D. Alexeev, A. Amoroso, A. Austregesilo, B. Badełek, F. Balestra, J. Ball, J. Barth, G. Baum, Y. Bedfer, J. Bernhard, R. Bertini, M. Bettinelli, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, A. BravarA. Bressan, G. Brona, E. Burtin, M. P. Bussa, D. Chaberny, D. Čotić, M. Chiosso, S. U. Chung, A. Cicuttin, M. Colantoni, M. L. Crespo, S. Dalla Torre, S. Das, S. S. Dasgupta, O. Yu Denisov, L. Dhara, V. Diaz, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, A. Efremov, A. El Alaoui, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, H. Fischer, C. Franco, J. M. Friedrich, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, R. Gazda, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, F. Haas, D. von Harrach, T. Hasegawa, F. H. Heinsius, R. Hermann, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch Höppner, N. d'Hose, C. Ilgner, S. Ishimoto, O. Ivanov, Yu Ivanshin, T. Iwata, R. Jahn, P. Jasinski, G. Jegou, R. Joosten, E. Kabuß, W. Käfer, D. Kang, B. Ketzer, G. V. Khaustov, Yu A. Khokhlov, Yu Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, R. Konopka, I. Konorov, V. F. Konstantinov, A. Korzenev, A. M. Kotzinian, O. Kouznetsov, K. Kowalik, M. Krämer, A. Kral, Z. V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, L. Lauser, J. M. Le Goff, A. A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, M. Maggiora, A. Magnon, G. K. Mallot, A. Mann, C. Marchand, J. Marroncle, A. Martin, J. Marzec, F. Massmann, T. Matsuda, W. Meyer, T. Michigami, Yu V. Mikhailov, M. A. Moinester, A. Mutter, A. Nagaytsev, T. Nagel, J. Nassalski, T. Negrini, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, A. S. Nunes, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, B. Pawlukiewicz-Kaminska, E. Perevalova, G. Pesaro, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, G. Pontecorvo, J. Pretz, C. Quintans, J. F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, A. Richter, F. Robinet, E. Rocco, E. Rondio, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, H. Santos, M. G. Sapozhnikov, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, L. Schmitt, S. Schopferer, W. Schröder, O. Yu Shevchenko, H. W. Siebert, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, R. Sulej, S. Takekawa, S. Tessaro, F. Tessarotto, A. Teufel, L. G. Tkatchev, S. Uhl, I. Uman, M. Virius, N. V. Vlassov, A. Vossen, Q. Weitzel, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, J. Zhao, N. Zhuravlev, A. Zvyagin

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

Abstract

The inclusive double-spin asymmetry, A₁^p, has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH₃ target. The data, collected in the year 2007, cover the range Q² > 1 (GeV / c)², 0.004 < x < 0.7 and improve the statistical precision of g₁^p (x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g₁^NS (x, Q²). The isovector quark density, Δ q₃ (x, Q²), is evaluated from a NLO QCD fit of g₁^NS. The first moment of Δ q₃ is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants | g_A / g_V | = 1.28 ± 0.07 (stat .) ± 0.10 (syst.).

Lingua originale	Inglese
pagine (da-a)	466-472
Numero di pagine	7
Rivista	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	690
Numero di pubblicazione	5
DOI	https://doi.org/10.1016/j.physletb.2010.05.069
Stato di pubblicazione	Pubblicato - 5 lug 2010
Pubblicato esternamente	Sì

Accesso al documento

10.1016/j.physletb.2010.05.069

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Cita questo

Alekseev, M. G., Alexakhin, V. Y., Alexandrov, Y., Alexeev, G. D., Amoroso, A., Austregesilo, A., Badełek, B., Balestra, F., Ball, J., Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., ... Zvyagin, A. (2010). The spin-dependent structure function of the proton g₁^p and a test of the Bjorken sum rule. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 690(5), 466-472. https://doi.org/10.1016/j.physletb.2010.05.069

@article{dbe683b2519845009aee78b6ea3bca1f,

title = "The spin-dependent structure function of the proton g1p and a test of the Bjorken sum rule",

abstract = "The inclusive double-spin asymmetry, A1p, has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q2 > 1 (GeV / c)2, 0.004 < x < 0.7 and improve the statistical precision of g1p (x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g1NS (x, Q2). The isovector quark density, Δ q3 (x, Q2), is evaluated from a NLO QCD fit of g1NS. The first moment of Δ q3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants | gA / gV | = 1.28 ± 0.07 (stat .) ± 0.10 (syst.).",

keywords = "Bjorken sum rule, COMPASS, Deep inelastic scattering, QCD analysis, Spin, Structure function",

author = "Alekseev, {M. G.} and Alexakhin, {V. Yu} and Yu Alexandrov and Alexeev, {G. D.} and A. Amoroso and A. Austregesilo and B. Bade{\l}ek and F. Balestra and J. Ball and J. Barth and G. Baum and Y. Bedfer and J. Bernhard and R. Bertini and M. Bettinelli and R. Birsa and J. Bisplinghoff and P. Bordalo and F. Bradamante and A. Bravar and A. Bressan and G. Brona and E. Burtin and Bussa, {M. P.} and D. Chaberny and D. {\v C}oti{\'c} and M. Chiosso and Chung, {S. U.} and A. Cicuttin and M. Colantoni and Crespo, {M. L.} and Torre, {S. Dalla} and S. Das and Dasgupta, {S. S.} and Denisov, {O. Yu} and L. Dhara and V. Diaz and Donskov, {S. V.} and N. Doshita and V. Duic and W. D{\"u}nnweber and A. Efremov and {El Alaoui}, A. and Eversheim, {P. D.} and W. Eyrich and M. Faessler and A. Ferrero and A. Filin and M. Finger and M. Finger and H. Fischer and C. Franco and Friedrich, {J. M.} and R. Garfagnini and F. Gautheron and Gavrichtchouk, {O. P.} and R. Gazda and S. Gerassimov and R. Geyer and M. Giorgi and I. Gnesi and B. Gobbo and S. Goertz and S. Grabm{\"u}ller and A. Grasso and B. Grube and R. Gushterski and A. Guskov and F. Haas and {von Harrach}, D. and T. Hasegawa and Heinsius, {F. H.} and R. Hermann and F. Herrmann and C. He{\ss} and F. Hinterberger and N. Horikawa and Ch H{\"o}ppner and N. d'Hose and C. Ilgner and S. Ishimoto and O. Ivanov and Yu Ivanshin and T. Iwata and R. Jahn and P. Jasinski and G. Jegou and R. Joosten and E. Kabu{\ss} and W. K{\"a}fer and D. Kang and B. Ketzer and Khaustov, {G. V.} and Khokhlov, {Yu A.} and Yu Kisselev and F. Klein and K. Klimaszewski and S. Koblitz and Koivuniemi, {J. H.} and Kolosov, {V. N.} and K. Kondo and K. K{\"o}nigsmann and R. Konopka and I. Konorov and Konstantinov, {V. F.} and A. Korzenev and Kotzinian, {A. M.} and O. Kouznetsov and K. Kowalik and M. Kr{\"a}mer and A. Kral and Kroumchtein, {Z. V.} and R. Kuhn and F. Kunne and K. Kurek and L. Lauser and {Le Goff}, {J. M.} and Lednev, {A. A.} and A. Lehmann and S. Levorato and J. Lichtenstadt and T. Liska and A. Maggiora and M. Maggiora and A. Magnon and Mallot, {G. K.} and A. Mann and C. Marchand and J. Marroncle and A. Martin and J. Marzec and F. Massmann and T. Matsuda and W. Meyer and T. Michigami and Mikhailov, {Yu V.} and Moinester, {M. A.} and A. Mutter and A. Nagaytsev and T. Nagel and J. Nassalski and T. Negrini and F. Nerling and S. Neubert and D. Neyret and Nikolaenko, {V. I.} and Nunes, {A. S.} and Olshevsky, {A. G.} and M. Ostrick and A. Padee and R. Panknin and D. Panzieri and B. Parsamyan and S. Paul and B. Pawlukiewicz-Kaminska and E. Perevalova and G. Pesaro and Peshekhonov, {D. V.} and G. Piragino and S. Platchkov and J. Pochodzalla and J. Polak and Polyakov, {V. A.} and G. Pontecorvo and J. Pretz and C. Quintans and Rajotte, {J. F.} and S. Ramos and V. Rapatsky and G. Reicherz and A. Richter and F. Robinet and E. Rocco and E. Rondio and Ryabchikov, {D. I.} and Samoylenko, {V. D.} and A. Sandacz and H. Santos and Sapozhnikov, {M. G.} and S. Sarkar and Savin, {I. A.} and G. Sbrizzai and P. Schiavon and C. Schill and T. Schl{\"u}ter and L. Schmitt and S. Schopferer and W. Schr{\"o}der and Shevchenko, {O. Yu} and Siebert, {H. W.} and L. Silva and L. Sinha and Sissakian, {A. N.} and M. Slunecka and Smirnov, {G. I.} and S. Sosio and F. Sozzi and A. Srnka and M. Stolarski and M. Sulc and R. Sulej and S. Takekawa and S. Tessaro and F. Tessarotto and A. Teufel and Tkatchev, {L. G.} and S. Uhl and I. Uman and M. Virius and Vlassov, {N. V.} and A. Vossen and Q. Weitzel and R. Windmolders and W. Wi{\'s}licki and H. Wollny and K. Zaremba and M. Zavertyaev and E. Zemlyanichkina and M. Ziembicki and J. Zhao and N. Zhuravlev and A. Zvyagin",

year = "2010",

month = jul,

day = "5",

doi = "10.1016/j.physletb.2010.05.069",

language = "English",

volume = "690",

pages = "466--472",

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

issn = "0370-2693",

publisher = "Elsevier",

number = "5",

}

Alekseev, MG, Alexakhin, VY, Alexandrov, Y, Alexeev, GD, Amoroso, A, Austregesilo, A, Badełek, B, Balestra, F, Ball, J, Barth, J, Baum, G, Bedfer, Y, Bernhard, J, Bertini, R, Bettinelli, M, Birsa, R, Bisplinghoff, J, Bordalo, P, Bradamante, F, Bravar, A, Bressan, A, Brona, G, Burtin, E, Bussa, MP, Chaberny, D, Čotić, D, Chiosso, M, Chung, SU, Cicuttin, A, Colantoni, M, Crespo, ML, Torre, SD, Das, S, Dasgupta, SS, Denisov, OY, Dhara, L, Diaz, V, Donskov, SV, Doshita, N, Duic, V, Dünnweber, W, Efremov, A, El Alaoui, A, Eversheim, PD, Eyrich, W, Faessler, M, Ferrero, A, Filin, A, Finger, M, Finger, M, Fischer, H, Franco, C, Friedrich, JM, Garfagnini, R, Gautheron, F, Gavrichtchouk, OP, Gazda, R, Gerassimov, S, Geyer, R, Giorgi, M, Gnesi, I, Gobbo, B, Goertz, S, Grabmüller, S, Grasso, A, Grube, B, Gushterski, R, Guskov, A, Haas, F, von Harrach, D, Hasegawa, T, Heinsius, FH, Hermann, R, Herrmann, F, Heß, C, Hinterberger, F, Horikawa, N, Höppner, C, d'Hose, N, Ilgner, C, Ishimoto, S, Ivanov, O, Ivanshin, Y, Iwata, T, Jahn, R, Jasinski, P, Jegou, G, Joosten, R, Kabuß, E, Käfer, W, Kang, D, Ketzer, B, Khaustov, GV, Khokhlov, YA, Kisselev, Y, Klein, F, Klimaszewski, K, Koblitz, S, Koivuniemi, JH, Kolosov, VN, Kondo, K, Königsmann, K, Konopka, R, Konorov, I, Konstantinov, VF, Korzenev, A, Kotzinian, AM, Kouznetsov, O, Kowalik, K, Krämer, M, Kral, A, Kroumchtein, ZV, Kuhn, R, Kunne, F, Kurek, K, Lauser, L, Le Goff, JM, Lednev, AA, Lehmann, A, Levorato, S, Lichtenstadt, J, Liska, T, Maggiora, A, Maggiora, M, Magnon, A, Mallot, GK, Mann, A, Marchand, C, Marroncle, J, Martin, A, Marzec, J, Massmann, F, Matsuda, T, Meyer, W, Michigami, T, Mikhailov, YV, Moinester, MA, Mutter, A, Nagaytsev, A, Nagel, T, Nassalski, J, Negrini, T, Nerling, F, Neubert, S, Neyret, D, Nikolaenko, VI, Nunes, AS, Olshevsky, AG, Ostrick, M, Padee, A, Panknin, R, Panzieri, D, Parsamyan, B, Paul, S, Pawlukiewicz-Kaminska, B, Perevalova, E, Pesaro, G, Peshekhonov, DV, Piragino, G, Platchkov, S, Pochodzalla, J, Polak, J, Polyakov, VA, Pontecorvo, G, Pretz, J, Quintans, C, Rajotte, JF, Ramos, S, Rapatsky, V, Reicherz, G, Richter, A, Robinet, F, Rocco, E, Rondio, E, Ryabchikov, DI, Samoylenko, VD, Sandacz, A, Santos, H, Sapozhnikov, MG, Sarkar, S, Savin, IA, Sbrizzai, G, Schiavon, P, Schill, C, Schlüter, T, Schmitt, L, Schopferer, S, Schröder, W, Shevchenko, OY, Siebert, HW, Silva, L, Sinha, L, Sissakian, AN, Slunecka, M, Smirnov, GI, Sosio, S, Sozzi, F, Srnka, A, Stolarski, M, Sulc, M, Sulej, R, Takekawa, S, Tessaro, S, Tessarotto, F, Teufel, A, Tkatchev, LG, Uhl, S, Uman, I, Virius, M, Vlassov, NV, Vossen, A, Weitzel, Q, Windmolders, R, Wiślicki, W, Wollny, H, Zaremba, K, Zavertyaev, M, Zemlyanichkina, E, Ziembicki, M, Zhao, J, Zhuravlev, N & Zvyagin, A 2010, 'The spin-dependent structure function of the proton g₁^p and a test of the Bjorken sum rule', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 690, n. 5, pagg. 466-472. https://doi.org/10.1016/j.physletb.2010.05.069

TY - JOUR

T1 - The spin-dependent structure function of the proton g1p and a test of the Bjorken sum rule

AU - Alekseev, M. G.

AU - Alexakhin, V. Yu

AU - Alexandrov, Yu

AU - Alexeev, G. D.

AU - Amoroso, A.

AU - Austregesilo, A.

AU - Badełek, B.

AU - Balestra, F.

AU - Ball, J.

AU - Barth, J.

AU - Baum, G.

AU - Bedfer, Y.

AU - Bernhard, J.

AU - Bertini, R.

AU - Bettinelli, M.

AU - Birsa, R.

AU - Bisplinghoff, J.

AU - Bordalo, P.

AU - Bradamante, F.

AU - Bravar, A.

AU - Bressan, A.

AU - Brona, G.

AU - Burtin, E.

AU - Bussa, M. P.

AU - Chaberny, D.

AU - Čotić, D.

AU - Chiosso, M.

AU - Chung, S. U.

AU - Cicuttin, A.

AU - Colantoni, M.

AU - Crespo, M. L.

AU - Torre, S. Dalla

AU - Das, S.

AU - Dasgupta, S. S.

AU - Denisov, O. Yu

AU - Dhara, L.

AU - Diaz, V.

AU - Donskov, S. V.

AU - Doshita, N.

AU - Duic, V.

AU - Dünnweber, W.

AU - Efremov, A.

AU - El Alaoui, A.

AU - Eversheim, P. D.

AU - Eyrich, W.

AU - Faessler, M.

AU - Ferrero, A.

AU - Filin, A.

AU - Finger, M.

AU - Fischer, H.

AU - Franco, C.

AU - Friedrich, J. M.

AU - Garfagnini, R.

AU - Gautheron, F.

AU - Gavrichtchouk, O. P.

AU - Gazda, R.

AU - Gerassimov, S.

AU - Geyer, R.

AU - Giorgi, M.

AU - Gnesi, I.

AU - Gobbo, B.

AU - Goertz, S.

AU - Grabmüller, S.

AU - Grasso, A.

AU - Grube, B.

AU - Gushterski, R.

AU - Guskov, A.

AU - Haas, F.

AU - von Harrach, D.

AU - Hasegawa, T.

AU - Heinsius, F. H.

AU - Hermann, R.

AU - Herrmann, F.

AU - Heß, C.

AU - Hinterberger, F.

AU - Horikawa, N.

AU - Höppner, Ch

AU - d'Hose, N.

AU - Ilgner, C.

AU - Ishimoto, S.

AU - Ivanov, O.

AU - Ivanshin, Yu

AU - Iwata, T.

AU - Jahn, R.

AU - Jasinski, P.

AU - Jegou, G.

AU - Joosten, R.

AU - Kabuß, E.

AU - Käfer, W.

AU - Kang, D.

AU - Ketzer, B.

AU - Khaustov, G. V.

AU - Khokhlov, Yu A.

AU - Kisselev, Yu

AU - Klein, F.

AU - Klimaszewski, K.

AU - Koblitz, S.

AU - Koivuniemi, J. H.

AU - Kolosov, V. N.

AU - Kondo, K.

AU - Königsmann, K.

AU - Konopka, R.

AU - Konorov, I.

AU - Konstantinov, V. F.

AU - Korzenev, A.

AU - Kotzinian, A. M.

AU - Kouznetsov, O.

AU - Kowalik, K.

AU - Krämer, M.

AU - Kral, A.

AU - Kroumchtein, Z. V.

AU - Kuhn, R.

AU - Kunne, F.

AU - Kurek, K.

AU - Lauser, L.

AU - Le Goff, J. M.

AU - Lednev, A. A.

AU - Lehmann, A.

AU - Levorato, S.

AU - Lichtenstadt, J.

AU - Liska, T.

AU - Maggiora, A.

AU - Maggiora, M.

AU - Magnon, A.

AU - Mallot, G. K.

AU - Mann, A.

AU - Marchand, C.

AU - Marroncle, J.

AU - Martin, A.

AU - Marzec, J.

AU - Massmann, F.

AU - Matsuda, T.

AU - Meyer, W.

AU - Michigami, T.

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PY - 2010/7/5

Y1 - 2010/7/5

N2 - The inclusive double-spin asymmetry, A1p, has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q2 > 1 (GeV / c)2, 0.004 < x < 0.7 and improve the statistical precision of g1p (x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g1NS (x, Q2). The isovector quark density, Δ q3 (x, Q2), is evaluated from a NLO QCD fit of g1NS. The first moment of Δ q3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants | gA / gV | = 1.28 ± 0.07 (stat .) ± 0.10 (syst.).

AB - The inclusive double-spin asymmetry, A1p, has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q2 > 1 (GeV / c)2, 0.004 < x < 0.7 and improve the statistical precision of g1p (x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g1NS (x, Q2). The isovector quark density, Δ q3 (x, Q2), is evaluated from a NLO QCD fit of g1NS. The first moment of Δ q3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants | gA / gV | = 1.28 ± 0.07 (stat .) ± 0.10 (syst.).

KW - Bjorken sum rule

KW - COMPASS

KW - Deep inelastic scattering

KW - QCD analysis

KW - Spin

KW - Structure function

UR - http://www.scopus.com/inward/record.url?scp=77953687374&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2010.05.069

DO - 10.1016/j.physletb.2010.05.069

M3 - Article

SN - 0370-2693

VL - 690

SP - 466

EP - 472

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 - 5