Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

E. S. Ageev; V. Yu Alexakhin; Yu Alexandrov; G. D. Alexeev; A. Amoroso; B. Badelek; F. Balestra; J. Ball; G. Baum; Y. Bedfer; P. Berglund; C. Bernet; R. Bertini; R. Birsa; J. Bisplinghoff; P. Bordalo; F. Bradamante; A. Bravar; A. Bressan; G. Brona; E. Burtin; M. P. Bussa; V. N. Bytchkov; L. Cerini; A. Chapiro; A. Cicuttin; M. Colantoni; A. A. Colavita; S. Costa; M. L. Crespo; S. Dalla Torre; S. S. Dasgupta; N. Dedek; R. De Masi; O. Yu Denisov; L. Dhara; V. Diaz; A. M. Dinkelbach; A. V. Dolgopolov; S. V. Donskov; V. A. Dorofeev; N. Doshita; V. Duic; W. Dünnweber; J. Ehlers; P. D. Eversheim; W. Eyrich; M. Fabro; M. Faessler; V. Falaleev; P. Fauland; A. Ferrero; L. Ferrero; M. Finger; M. Finger; H. Fischer; J. Franz; J. M. Friedrich; V. Frolov; R. Garfagnini; F. Gautheron; O. P. Gavrichtchouk; S. Gerassimov; R. Geyer; M. Giorgi; B. Gobbo; S. Goertz; A. M. Gorin; O. A. Grajek; A. Grasso; B. Grube; A. Grünemaier; J. Hannappel; D. Von Harrach; T. Hasegawa; S. Hedicke; F. H. Heinsius; R. Hermann; C. Heß; F. Hinterberger; M. Von Hodenberg; N. Horikawa; S. Horikawa; N. D'Hose; R. B. Ijaduola; C. Ilgner; A. I. Ioukaev; S. Ishimoto; O. Ivanov; T. Iwata; R. Jahn; A. Janata; R. Joosten; N. I. Jouravlev; E. Kabuß; V. Kalinnikov; D. Kang; F. Karstens; W. Kastaun; B. Ketzer; G. V. Khaustov; Yu A. Khokhlov; N. V. Khomutov; Yu Kisselev; F. Klein; S. Koblitz; J. H. Koivuniemi; V. N. Kolosov; E. V. Komissarov; K. Kondo; K. Königsmann; A. K. Konoplyannikov; I. Konorov; V. F. Konstantinov; A. S. Korentchenko; A. Korzenev; A. M. Kotzinian; N. A. Koutchinski; K. Kowalik; N. P. Kravchuk; G. V. Krivokhizhin; Z. V. Kroumchtein; R. Kuhn; F. Kunne; K. Kurek; M. E. Ladygin; M. Lamanna; M. Leberig; J. M. Le Goff; J. Lichtenstadt; T. Liska; I. Ludwig; A. Maggiora; M. Maggiora; A. Magnon; G. K. Mallot; I. V. Manuilov; C. Marchand; J. Marroncle; A. Martin; J. Marzec; T. Matsuda; A. N. Maximov; K. S. Medved; W. Meyer; A. Mielech; Yu V. Mikhailov; M. A. Moinester; O. Nähle; J. Nassalski; S. Neliba; D. P. Neyret; V. I. Nikolaenko; A. A. Nozdrin; V. F. Obraztsov; A. G. Olshevsky; M. Ostrick; A. Padee; P. Pagano; S. Panebianco; D. Panzieri; S. Paul; H. D. Pereira; D. V. Peshekhonov; V. D. Peshekhonov; G. Piragino; S. Platchkov; K. Platzer; J. Pochodzalla; V. A. Polyakov; A. A. Popov; J. Pretz; S. Procureur; C. Quintans; S. Ramos; P. C. Rebourgeard; G. Reicherz; J. Reymann; K. Rith; E. Rondio; A. M. Rozhdestvensky; A. B. Sadovski; E. Saller; V. D. Samoylenko; A. Sandacz; M. Sans; M. G. Sapozhnikov; I. A. Savin; P. Schiavon; C. Schill; T. Schmidt; H. Schmitt; L. Schmitt; O. Yu Shevchenko; A. A. Shishkin; H. W. Siebert; L. Sinha; A. N. Sissakian; A. Skachkova; M. Slunecka; G. I. Smirnov; F. Sozzi; A. Srnka; F. Stinzing; M. Stolarski; V. P. Sugonyaev; M. Sulc; R. Sulej; N. Takabayashi; V. V. Tchalishev; F. Tessarotto; A. Teufel; D. Thers; L. G. Tkatchev; T. Toeda; V. I. Tretyak; S. Trousov; M. Varanda; M. Virius; N. V. Vlassov; M. Wagner; R. Webb; E. Weise; Q. Weitzel; U. Wiedner; M. Wiesmann; R. Windmolders; S. Wirth; W. Wiślicki; A. M. Zanetti; K. Zaremba; J. Zhao; R. Ziegler; A. Zvyagin

doi:10.1016/j.physletb.2005.11.049

Gluon polarization in the nucleon from quasi-real photoproduction of high-p_T hadron pairs

E. S. Ageev, V. Yu Alexakhin, Yu Alexandrov, G. D. Alexeev, A. Amoroso, B. Badelek, F. Balestra, J. Ball, G. Baum, Y. Bedfer, P. Berglund, C. Bernet, R. Bertini, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, A. Bravar, A. Bressan, G. BronaE. Burtin, M. P. Bussa, V. N. Bytchkov, L. Cerini, A. Chapiro, A. Cicuttin, M. Colantoni, A. A. Colavita, S. Costa, M. L. Crespo, S. Dalla Torre, S. S. Dasgupta, N. Dedek, R. De Masi, O. Yu Denisov, L. Dhara, V. Diaz, A. M. Dinkelbach, A. V. Dolgopolov, S. V. Donskov, V. A. Dorofeev, N. Doshita, V. Duic, W. Dünnweber, J. Ehlers, P. D. Eversheim, W. Eyrich, M. Fabro, M. Faessler, V. Falaleev, P. Fauland, A. Ferrero, L. Ferrero, M. Finger, M. Finger, H. Fischer, J. Franz, J. M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, B. Gobbo, S. Goertz, A. M. Gorin, O. A. Grajek, A. Grasso, B. Grube, A. Grünemaier, J. Hannappel, D. Von Harrach, T. Hasegawa, S. Hedicke, F. H. Heinsius, R. Hermann, C. Heß, F. Hinterberger, M. Von Hodenberg, N. Horikawa, S. Horikawa, N. D'Hose, R. B. Ijaduola, C. Ilgner, A. I. Ioukaev, S. Ishimoto, O. Ivanov, T. Iwata, R. Jahn, A. Janata, R. Joosten, N. I. Jouravlev, E. Kabuß, V. Kalinnikov, D. Kang, F. Karstens, W. Kastaun, B. Ketzer, G. V. Khaustov, Yu A. Khokhlov, N. V. Khomutov, Yu Kisselev, F. Klein, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, E. V. Komissarov, K. Kondo, K. Königsmann, A. K. Konoplyannikov, I. Konorov, V. F. Konstantinov, A. S. Korentchenko, A. Korzenev, A. M. Kotzinian, N. A. Koutchinski, K. Kowalik, N. P. Kravchuk, G. V. Krivokhizhin, Z. V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, M. E. Ladygin, M. Lamanna, M. Leberig, J. M. Le Goff, J. Lichtenstadt, T. Liska, I. Ludwig, A. Maggiora, M. Maggiora, A. Magnon, G. K. Mallot, I. V. Manuilov, C. Marchand, J. Marroncle, A. Martin, J. Marzec, T. Matsuda, A. N. Maximov, K. S. Medved, W. Meyer, A. Mielech, Yu V. Mikhailov, M. A. Moinester, O. Nähle, J. Nassalski, S. Neliba, D. P. Neyret, V. I. Nikolaenko, A. A. Nozdrin, V. F. Obraztsov, A. G. Olshevsky, M. Ostrick, A. Padee, P. Pagano, S. Panebianco, D. Panzieri, S. Paul, H. D. Pereira, D. V. Peshekhonov, V. D. Peshekhonov, G. Piragino, S. Platchkov, K. Platzer, J. Pochodzalla, V. A. Polyakov, A. A. Popov, J. Pretz, S. Procureur, C. Quintans, S. Ramos, P. C. Rebourgeard, G. Reicherz, J. Reymann, K. Rith, E. Rondio, A. M. Rozhdestvensky, A. B. Sadovski, E. Saller, V. D. Samoylenko, A. Sandacz, M. Sans, M. G. Sapozhnikov, I. A. Savin, P. Schiavon, C. Schill, T. Schmidt, H. Schmitt, L. Schmitt, O. Yu Shevchenko, A. A. Shishkin, H. W. Siebert, L. Sinha, A. N. Sissakian, A. Skachkova, M. Slunecka, G. I. Smirnov, F. Sozzi, A. Srnka, F. Stinzing, M. Stolarski, V. P. Sugonyaev, M. Sulc, R. Sulej, N. Takabayashi, V. V. Tchalishev, F. Tessarotto, A. Teufel, D. Thers, L. G. Tkatchev, T. Toeda, V. I. Tretyak, S. Trousov, M. Varanda, M. Virius, N. V. Vlassov, M. Wagner, R. Webb, E. Weise, Q. Weitzel, U. Wiedner, M. Wiesmann, R. Windmolders, S. Wirth, W. Wiślicki, A. M. Zanetti, K. Zaremba, J. Zhao, R. Ziegler, A. Zvyagin

Research output: Contribution to journal › Article › peer-review

173 Scopus citations

Abstract

We present a determination of the gluon polarization ΔG/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q²<1 (GeV/c)², with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized ⁶LiD target. The helicity asymmetry for the selected events is 〈A∥/D〉=0.002±0.019(stat)±0.003(syst). From this value, we obtain in a leading-order QCD analysis ΔG/G=0.024±0. 089(stat)±0.057(syst) at x_g=0.095 and μ2≃3 (GeV/c)².

Original language	English
Pages (from-to)	25-32
Number of pages	8
Journal	Physics Letters B
Volume	633
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2005.11.049
State	Published - Feb 2 2006
Externally published	Yes

Keywords

Asymmetry
Deep inelastic scattering
Gluon
Nucleon
Polarization
Spin

Access to Document

10.1016/j.physletb.2005.11.049

Cite this

Ageev, E. S., Alexakhin, V. Y., Alexandrov, Y., Alexeev, G. D., Amoroso, A., Badelek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., Berglund, P., Bernet, C., Bertini, R., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., ... Zvyagin, A. (2006). Gluon polarization in the nucleon from quasi-real photoproduction of high-p_T hadron pairs. Physics Letters B, 633(1), 25-32. https://doi.org/10.1016/j.physletb.2005.11.049

@article{22b62cecd65b47a6a96d8a932155dbf7,

title = "Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs",

abstract = "We present a determination of the gluon polarization ΔG/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q2<1 (GeV/c)2, with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6LiD target. The helicity asymmetry for the selected events is 〈A∥/D〉=0.002±0.019(stat)±0.003(syst). From this value, we obtain in a leading-order QCD analysis ΔG/G=0.024±0. 089(stat)±0.057(syst) at xg=0.095 and μ2≃3 (GeV/c)2.",

keywords = "Asymmetry, Deep inelastic scattering, Gluon, Nucleon, Polarization, Spin",

author = "Ageev, {E. S.} and Alexakhin, {V. Yu} and Yu Alexandrov and Alexeev, {G. D.} and A. Amoroso and B. Badelek and F. Balestra and J. Ball and G. Baum and Y. Bedfer and P. Berglund and C. Bernet and R. Bertini 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 Bytchkov, {V. N.} and L. Cerini and A. Chapiro and A. Cicuttin and M. Colantoni and Colavita, {A. A.} and S. Costa and Crespo, {M. L.} and {Dalla Torre}, S. and Dasgupta, {S. S.} and N. Dedek and {De Masi}, R. and Denisov, {O. Yu} and L. Dhara and V. Diaz and Dinkelbach, {A. M.} and Dolgopolov, {A. V.} and Donskov, {S. V.} and Dorofeev, {V. A.} and N. Doshita and V. Duic and W. D{\"u}nnweber and J. Ehlers and Eversheim, {P. D.} and W. Eyrich and M. Fabro and M. Faessler and V. Falaleev and P. Fauland and A. Ferrero and L. Ferrero and M. Finger and M. Finger and H. Fischer and J. Franz and Friedrich, {J. M.} and V. Frolov and R. Garfagnini and F. Gautheron and Gavrichtchouk, {O. P.} and S. Gerassimov and R. Geyer and M. Giorgi and B. Gobbo and S. Goertz and Gorin, {A. M.} and Grajek, {O. A.} and A. Grasso and B. Grube and A. Gr{\"u}nemaier and J. Hannappel and {Von Harrach}, D. and T. Hasegawa and S. Hedicke and Heinsius, {F. H.} and R. Hermann and C. He{\ss} and F. Hinterberger and {Von Hodenberg}, M. and N. Horikawa and S. Horikawa and N. D'Hose and Ijaduola, {R. B.} and C. Ilgner and Ioukaev, {A. I.} and S. Ishimoto and O. Ivanov and T. Iwata and R. Jahn and A. Janata and R. Joosten and Jouravlev, {N. I.} and E. Kabu{\ss} and V. Kalinnikov and D. Kang and F. Karstens and W. Kastaun and B. Ketzer and Khaustov, {G. V.} and Khokhlov, {Yu A.} and Khomutov, {N. V.} and Yu Kisselev and F. Klein and S. Koblitz and Koivuniemi, {J. H.} and Kolosov, {V. N.} and Komissarov, {E. V.} and K. Kondo and K. K{\"o}nigsmann and Konoplyannikov, {A. K.} and I. Konorov and Konstantinov, {V. F.} and Korentchenko, {A. S.} and A. Korzenev and Kotzinian, {A. M.} and Koutchinski, {N. A.} and K. Kowalik and Kravchuk, {N. P.} and Krivokhizhin, {G. V.} and Kroumchtein, {Z. V.} and R. Kuhn and F. Kunne and K. Kurek and Ladygin, {M. E.} and M. Lamanna and M. Leberig and {Le Goff}, {J. M.} and J. Lichtenstadt and T. Liska and I. Ludwig and A. Maggiora and M. Maggiora and A. Magnon and Mallot, {G. K.} and Manuilov, {I. V.} and C. Marchand and J. Marroncle and A. Martin and J. Marzec and T. Matsuda and Maximov, {A. N.} and Medved, {K. S.} and W. Meyer and A. Mielech and Mikhailov, {Yu V.} and Moinester, {M. A.} and O. N{\"a}hle and J. Nassalski and S. Neliba and Neyret, {D. P.} and Nikolaenko, {V. I.} and Nozdrin, {A. A.} and Obraztsov, {V. F.} and Olshevsky, {A. G.} and M. Ostrick and A. Padee and P. Pagano and S. Panebianco and D. Panzieri and S. Paul and Pereira, {H. D.} and Peshekhonov, {D. V.} and Peshekhonov, {V. D.} and G. Piragino and S. Platchkov and K. Platzer and J. Pochodzalla and Polyakov, {V. A.} and Popov, {A. A.} and J. Pretz and S. Procureur and C. Quintans and S. Ramos and Rebourgeard, {P. C.} and G. Reicherz and J. Reymann and K. Rith and E. Rondio and Rozhdestvensky, {A. M.} and Sadovski, {A. B.} and E. Saller and Samoylenko, {V. D.} and A. Sandacz and M. Sans and Sapozhnikov, {M. G.} and Savin, {I. A.} and P. Schiavon and C. Schill and T. Schmidt and H. Schmitt and L. Schmitt and Shevchenko, {O. Yu} and Shishkin, {A. A.} and Siebert, {H. W.} and L. Sinha and Sissakian, {A. N.} and A. Skachkova and M. Slunecka and Smirnov, {G. I.} and F. Sozzi and A. Srnka and F. Stinzing and M. Stolarski and Sugonyaev, {V. P.} and M. Sulc and R. Sulej and N. Takabayashi and Tchalishev, {V. V.} and F. Tessarotto and A. Teufel and D. Thers and Tkatchev, {L. G.} and T. Toeda and Tretyak, {V. I.} and S. Trousov and M. Varanda and M. Virius and Vlassov, {N. V.} and M. Wagner and R. Webb and E. Weise and Q. Weitzel and U. Wiedner and M. Wiesmann and R. Windmolders and S. Wirth and W. Wi{\'s}licki and Zanetti, {A. M.} and K. Zaremba and J. Zhao and R. Ziegler and A. Zvyagin",

year = "2006",

month = feb,

day = "2",

doi = "10.1016/j.physletb.2005.11.049",

language = "English",

volume = "633",

pages = "25--32",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1",

}

Ageev, ES, Alexakhin, VY, Alexandrov, Y, Alexeev, GD, Amoroso, A, Badelek, B, Balestra, F, Ball, J, Baum, G, Bedfer, Y, Berglund, P, Bernet, C, Bertini, R, Birsa, R, Bisplinghoff, J, Bordalo, P, Bradamante, F, Bravar, A, Bressan, A, Brona, G, Burtin, E, Bussa, MP, Bytchkov, VN, Cerini, L, Chapiro, A, Cicuttin, A, Colantoni, M, Colavita, AA, Costa, S, Crespo, ML, Dalla Torre, S, Dasgupta, SS, Dedek, N, De Masi, R, Denisov, OY, Dhara, L, Diaz, V, Dinkelbach, AM, Dolgopolov, AV, Donskov, SV, Dorofeev, VA, Doshita, N, Duic, V, Dünnweber, W, Ehlers, J, Eversheim, PD, Eyrich, W, Fabro, M, Faessler, M, Falaleev, V, Fauland, P, Ferrero, A, Ferrero, L, Finger, M, Finger, M, Fischer, H, Franz, J, Friedrich, JM, Frolov, V, Garfagnini, R, Gautheron, F, Gavrichtchouk, OP, Gerassimov, S, Geyer, R, Giorgi, M, Gobbo, B, Goertz, S, Gorin, AM, Grajek, OA, Grasso, A, Grube, B, Grünemaier, A, Hannappel, J, Von Harrach, D, Hasegawa, T, Hedicke, S, Heinsius, FH, Hermann, R, Heß, C, Hinterberger, F, Von Hodenberg, M, Horikawa, N, Horikawa, S, D'Hose, N, Ijaduola, RB, Ilgner, C, Ioukaev, AI, Ishimoto, S, Ivanov, O, Iwata, T, Jahn, R, Janata, A, Joosten, R, Jouravlev, NI, Kabuß, E, Kalinnikov, V, Kang, D, Karstens, F, Kastaun, W, Ketzer, B, Khaustov, GV, Khokhlov, YA, Khomutov, NV, Kisselev, Y, Klein, F, Koblitz, S, Koivuniemi, JH, Kolosov, VN, Komissarov, EV, Kondo, K, Königsmann, K, Konoplyannikov, AK, Konorov, I, Konstantinov, VF, Korentchenko, AS, Korzenev, A, Kotzinian, AM, Koutchinski, NA, Kowalik, K, Kravchuk, NP, Krivokhizhin, GV, Kroumchtein, ZV, Kuhn, R, Kunne, F, Kurek, K, Ladygin, ME, Lamanna, M, Leberig, M, Le Goff, JM, Lichtenstadt, J, Liska, T, Ludwig, I, Maggiora, A, Maggiora, M, Magnon, A, Mallot, GK, Manuilov, IV, Marchand, C, Marroncle, J, Martin, A, Marzec, J, Matsuda, T, Maximov, AN, Medved, KS, Meyer, W, Mielech, A, Mikhailov, YV, Moinester, MA, Nähle, O, Nassalski, J, Neliba, S, Neyret, DP, Nikolaenko, VI, Nozdrin, AA, Obraztsov, VF, Olshevsky, AG, Ostrick, M, Padee, A, Pagano, P, Panebianco, S, Panzieri, D, Paul, S, Pereira, HD, Peshekhonov, DV, Peshekhonov, VD, Piragino, G, Platchkov, S, Platzer, K, Pochodzalla, J, Polyakov, VA, Popov, AA, Pretz, J, Procureur, S, Quintans, C, Ramos, S, Rebourgeard, PC, Reicherz, G, Reymann, J, Rith, K, Rondio, E, Rozhdestvensky, AM, Sadovski, AB, Saller, E, Samoylenko, VD, Sandacz, A, Sans, M, Sapozhnikov, MG, Savin, IA, Schiavon, P, Schill, C, Schmidt, T, Schmitt, H, Schmitt, L, Shevchenko, OY, Shishkin, AA, Siebert, HW, Sinha, L, Sissakian, AN, Skachkova, A, Slunecka, M, Smirnov, GI, Sozzi, F, Srnka, A, Stinzing, F, Stolarski, M, Sugonyaev, VP, Sulc, M, Sulej, R, Takabayashi, N, Tchalishev, VV, Tessarotto, F, Teufel, A, Thers, D, Tkatchev, LG, Toeda, T, Tretyak, VI, Trousov, S, Varanda, M, Virius, M, Vlassov, NV, Wagner, M, Webb, R, Weise, E, Weitzel, Q, Wiedner, U, Wiesmann, M, Windmolders, R, Wirth, S, Wiślicki, W, Zanetti, AM, Zaremba, K, Zhao, J, Ziegler, R & Zvyagin, A 2006, 'Gluon polarization in the nucleon from quasi-real photoproduction of high-p_T hadron pairs', Physics Letters B, vol. 633, no. 1, pp. 25-32. https://doi.org/10.1016/j.physletb.2005.11.049

TY - JOUR

T1 - Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

AU - Ageev, E. S.

AU - Alexakhin, V. Yu

AU - Alexandrov, Yu

AU - Alexeev, G. D.

AU - Amoroso, A.

AU - Badelek, B.

AU - Balestra, F.

AU - Ball, J.

AU - Baum, G.

AU - Bedfer, Y.

AU - Berglund, P.

AU - Bernet, C.

AU - Bertini, R.

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 - Bytchkov, V. N.

AU - Cerini, L.

AU - Chapiro, A.

AU - Cicuttin, A.

AU - Colantoni, M.

AU - Colavita, A. A.

AU - Costa, S.

AU - Crespo, M. L.

AU - Dalla Torre, S.

AU - Dasgupta, S. S.

AU - Dedek, N.

AU - De Masi, R.

AU - Denisov, O. Yu

AU - Dhara, L.

AU - Diaz, V.

AU - Dinkelbach, A. M.

AU - Dolgopolov, A. V.

AU - Donskov, S. V.

AU - Dorofeev, V. A.

AU - Doshita, N.

AU - Duic, V.

AU - Dünnweber, W.

AU - Ehlers, J.

AU - Eversheim, P. D.

AU - Eyrich, W.

AU - Fabro, M.

AU - Faessler, M.

AU - Falaleev, V.

AU - Fauland, P.

AU - Ferrero, A.

AU - Ferrero, L.

AU - Finger, M.

AU - Fischer, H.

AU - Franz, J.

AU - Friedrich, J. M.

AU - Frolov, V.

AU - Garfagnini, R.

AU - Gautheron, F.

AU - Gavrichtchouk, O. P.

AU - Gerassimov, S.

AU - Geyer, R.

AU - Giorgi, M.

AU - Gobbo, B.

AU - Goertz, S.

AU - Gorin, A. M.

AU - Grajek, O. A.

AU - Grasso, A.

AU - Grube, B.

AU - Grünemaier, A.

AU - Hannappel, J.

AU - Von Harrach, D.

AU - Hasegawa, T.

AU - Hedicke, S.

AU - Heinsius, F. H.

AU - Hermann, R.

AU - Heß, C.

AU - Hinterberger, F.

AU - Von Hodenberg, M.

AU - Horikawa, N.

AU - Horikawa, S.

AU - D'Hose, N.

AU - Ijaduola, R. B.

AU - Ilgner, C.

AU - Ioukaev, A. I.

AU - Ishimoto, S.

AU - Ivanov, O.

AU - Iwata, T.

AU - Jahn, R.

AU - Janata, A.

AU - Joosten, R.

AU - Jouravlev, N. I.

AU - Kabuß, E.

AU - Kalinnikov, V.

AU - Kang, D.

AU - Karstens, F.

AU - Kastaun, W.

AU - Ketzer, B.

AU - Khaustov, G. V.

AU - Khokhlov, Yu A.

AU - Khomutov, N. V.

AU - Kisselev, Yu

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PY - 2006/2/2

Y1 - 2006/2/2

N2 - We present a determination of the gluon polarization ΔG/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q2<1 (GeV/c)2, with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6LiD target. The helicity asymmetry for the selected events is 〈A∥/D〉=0.002±0.019(stat)±0.003(syst). From this value, we obtain in a leading-order QCD analysis ΔG/G=0.024±0. 089(stat)±0.057(syst) at xg=0.095 and μ2≃3 (GeV/c)2.

AB - We present a determination of the gluon polarization ΔG/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q2<1 (GeV/c)2, with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6LiD target. The helicity asymmetry for the selected events is 〈A∥/D〉=0.002±0.019(stat)±0.003(syst). From this value, we obtain in a leading-order QCD analysis ΔG/G=0.024±0. 089(stat)±0.057(syst) at xg=0.095 and μ2≃3 (GeV/c)2.

KW - Asymmetry

KW - Deep inelastic scattering

KW - Gluon

KW - Nucleon

KW - Polarization

KW - Spin

UR - http://www.scopus.com/inward/record.url?scp=30544453196&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2005.11.049

DO - 10.1016/j.physletb.2005.11.049

M3 - Article

AN - SCOPUS:30544453196

SN - 0370-2693

VL - 633

SP - 25

EP - 32

JO - Physics Letters B

JF - Physics Letters B

IS - 1

ER -

Gluon polarization in the nucleon from quasi-real photoproduction of high-p_T hadron pairs

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