First measurement of the Sivers asymmetry for gluons using SIDIS data

C. Adolph; M. Aghasyan; R. Akhunzyanov; M. G. Alexeev; G. D. Alexeev; A. Amoroso; V. Andrieux; N. V. Anfimov; V. Anosov; A. Antoshkin; 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; C. Quintans; M. Dziewiecki; A. Efremov; P. D. Eversheim; W. Eyrich; S. Ramos; 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; M. Ziembicki; A. Zink; C. Regali; G. Reicherz; C. Riedl; M. Roskot; N. S. Rogacheva; 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; J. ter Wolbeek; K. Zaremba; P. Zavada; M. Zavertyaev; E. Zemlyanichkina; N. Zhuravlev

doi:10.1016/j.physletb.2017.07.018

First measurement of the Sivers asymmetry for gluons using SIDIS data

C. Adolph, M. Aghasyan, R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev, A. Amoroso, V. Andrieux, N. V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C. D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. BedferJ. 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, C. Quintans, M. Dziewiecki, A. Efremov, P. D. Eversheim, W. Eyrich, S. Ramos, 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, M. Ziembicki, A. Zink, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N. S. Rogacheva, 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, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev

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

Abstract

The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon–gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon–gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.

Original language	English (US)
Pages (from-to)	854-864
Number of pages	11
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	772
DOIs	https://doi.org/10.1016/j.physletb.2017.07.018
State	Published - Oct 10 2017

Keywords

Deep inelastic scattering
Gluon
PDF
Sivers
TMD

ASJC Scopus subject areas

Nuclear and High Energy Physics

Online availability

10.1016/j.physletb.2017.07.018

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Cite this

Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., ... Zhuravlev, N. (2017). First measurement of the Sivers asymmetry for gluons using SIDIS data. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 772, 854-864. https://doi.org/10.1016/j.physletb.2017.07.018

Adolph, C, Aghasyan, M, Akhunzyanov, R, Alexeev, MG, Alexeev, GD, Amoroso, A, Andrieux, V, Anfimov, NV, Anosov, V, Antoshkin, A, 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, Quintans, C, Dziewiecki, M, Efremov, A, Eversheim, PD, Eyrich, W, Ramos, S, 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, Ziembicki, M, Zink, A, Regali, C, Reicherz, G, Riedl, C, Roskot, M, Rogacheva, 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, ter Wolbeek, J, Zaremba, K, Zavada, P, Zavertyaev, M, Zemlyanichkina, E & Zhuravlev, N 2017, 'First measurement of the Sivers asymmetry for gluons using SIDIS data', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 772, pp. 854-864. https://doi.org/10.1016/j.physletb.2017.07.018

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title = "First measurement of the Sivers asymmetry for gluons using SIDIS data",

abstract = "The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon–gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon–gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.",

keywords = "Deep inelastic scattering, Gluon, PDF, Sivers, TMD",

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 A. Antoshkin 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 C. Quintans and M. Dziewiecki and A. Efremov and Eversheim, {P. D.} and W. Eyrich and S. Ramos 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 M. Ziembicki and A. Zink and C. Regali and G. Reicherz and C. Riedl and M. Roskot and Rogacheva, {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 {ter Wolbeek}, J. and K. Zaremba and P. Zavada and M. Zavertyaev and E. Zemlyanichkina and N. Zhuravlev",

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

year = "2017",

month = oct,

day = "10",

doi = "10.1016/j.physletb.2017.07.018",

language = "English (US)",

volume = "772",

pages = "854--864",

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

issn = "0370-2693",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - First measurement of the Sivers asymmetry for gluons using SIDIS data

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 - Antoshkin, A.

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 - Quintans, C.

AU - Dziewiecki, M.

AU - Efremov, A.

AU - Eversheim, P. D.

AU - Eyrich, W.

AU - Ramos, S.

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

AU - Iwata, T.

AU - Jary, V.

AU - Joosten, R.

AU - Jörg, P.

AU - Kabuß, E.

AU - Kerbizi, A.

AU - Ketzer, B.

AU - Khaustov, G. V.

AU - Khokhlov, Yu A.

AU - Kisselev, Yu

AU - Klein, F.

AU - Klimaszewski, K.

AU - Koivuniemi, J. H.

AU - Kolosov, V. N.

AU - Kondo, K.

AU - Königsmann, K.

AU - Konorov, I.

AU - Konstantinov, V. F.

AU - Kotzinian, A. M.

AU - Kouznetsov, O. M.

AU - Krämer, M.

AU - Kremser, P.

AU - Krinner, F.

AU - Kroumchtein, Z. V.

AU - Kulinich, Y.

AU - Kunne, F.

AU - Kurek, K.

AU - Kurjata, R. P.

AU - Lednev, A. A.

AU - Lehmann, A.

AU - Levillain, M.

AU - Levorato, S.

AU - Lian, Y. S.

AU - Lichtenstadt, J.

AU - Longo, R.

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PY - 2017/10/10

Y1 - 2017/10/10

N2 - The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon–gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon–gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.

AB - The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon–gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon–gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.

KW - Deep inelastic scattering

KW - Gluon

KW - PDF

KW - Sivers

KW - TMD

UR - http://www.scopus.com/inward/record.url?scp=85027275603&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85027275603&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2017.07.018

DO - 10.1016/j.physletb.2017.07.018

M3 - Article

AN - SCOPUS:85027275603

SN - 0370-2693

VL - 772

SP - 854

EP - 864

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

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

ER -

First measurement of the Sivers asymmetry for gluons using SIDIS data

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