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 | |
| State | Published - Oct 10 2017 |
Keywords
- Deep inelastic scattering
- Gluon
- Sivers
- TMD
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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First measurement of the Sivers asymmetry for gluons using SIDIS data. / 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.; Bedfer, Y.; Bernhard, J.; Bicker, K.; Bielert, E. R.; Birsa, R.; Bodlak, M.; Bordalo, P.; Bradamante, F.; Braun, C.; Bressan, A.; Büchele, M.; Chang, W. C.; Chatterjee, C.; Chiosso, M.; Choi, I.; Chung, S. U.; Cicuttin, A.; Crespo, M. L.; Curiel, Q.; Dalla Torre, S.; Dasgupta, S. S.; Dasgupta, S.; Denisov, O. Yu; Dhara, L.; Donskov, S. V.; Doshita, N.; Dreisbach, Ch; Duic, V.; Quintans, C.; Dziewiecki, M.; Efremov, A.; Eversheim, P. D.; Eyrich, W.; Ramos, S.; Ferrero, A.; Finger, M.; Finger, M.; Fischer, H.; Franco, C.; du Fresne von Hohenesche, N.; Friedrich, J. M.; Frolov, V.; Fuchey, E.; Gautheron, F.; Gavrichtchouk, O. P.; 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, F. H.; Heitz, R.; Herrmann, F.; Horikawa, N.; d'Hose, N.; Hsieh, C. Y.; Huber, S.; Ishimoto, S.; Ivanov, A.; Ivanshin, Yu; Iwata, T.; Jary, V.; Joosten, R.; Jörg, P.; Kabuß, E.; Kerbizi, A.; Ketzer, B.; Khaustov, G. V.; Khokhlov, Yu A.; Kisselev, Yu; Klein, F.; Klimaszewski, K.; Koivuniemi, J. H.; Kolosov, V. N.; Kondo, K.; Königsmann, K.; Konorov, I.; Konstantinov, V. F.; Kotzinian, A. M.; Kouznetsov, O. M.; Krämer, M.; Kremser, P.; Krinner, F.; Kroumchtein, Z. V.; Kulinich, Y.; Kunne, F.; Kurek, K.; Kurjata, R. P.; Lednev, A. A.; Lehmann, A.; Levillain, M.; Levorato, S.; Lian, Y. S.; Lichtenstadt, J.; Longo, R.; Maggiora, A.; Magnon, A.; Makins, N.; Makke, N.; Mallot, G. K.; Marianski, B.; Martin, A.; Marzec, J.; Matoušek, J.; Matsuda, H.; Matsuda, T.; Meshcheryakov, G. V.; Meyer, M.; Meyer, W.; Mikhailov, Yu V.; Mikhasenko, M.; Mitrofanov, E.; Mitrofanov, N.; Miyachi, Y.; Nagaytsev, A.; Nerling, F.; Neyret, D.; Nový, J.; Nowak, W. D.; Nukazuka, G.; Nunes, A. S.; Olshevsky, A. G.; Orlov, I.; Ostrick, M.; Panzieri, D.; Parsamyan, B.; Paul, S.; Peng, J. C.; Pereira, F.; Pešek, M.; Peshekhonov, D. V.; Pierre, N.; Platchkov, S.; Pochodzalla, J.; Polyakov, V. A.; Pretz, J.; Quaresma, M.; Ziembicki, M.; Zink, A.; Regali, C.; Reicherz, G.; Riedl, C.; Roskot, M.; Rogacheva, N. S.; Ryabchikov, D. I.; Rybnikov, A.; Rychter, A.; Salac, R.; Samoylenko, V. D.; Sandacz, A.; Santos, C.; Sarkar, S.; Savin, I. A.; 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.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 772, 10.10.2017, p. 854-864.Research output: Contribution to journal › Article › peer-review
}
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 - 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.
AU - Maggiora, A.
AU - Magnon, A.
AU - Makins, N.
AU - Makke, N.
AU - Mallot, G. K.
AU - Marianski, B.
AU - Martin, A.
AU - Marzec, J.
AU - Matoušek, J.
AU - Matsuda, H.
AU - Matsuda, T.
AU - Meshcheryakov, G. V.
AU - Meyer, M.
AU - Meyer, W.
AU - Mikhailov, Yu V.
AU - Mikhasenko, M.
AU - Mitrofanov, E.
AU - Mitrofanov, N.
AU - Miyachi, Y.
AU - Nagaytsev, A.
AU - Nerling, F.
AU - Neyret, D.
AU - Nový, J.
AU - Nowak, W. D.
AU - Nukazuka, G.
AU - Nunes, A. S.
AU - Olshevsky, A. G.
AU - Orlov, I.
AU - Ostrick, M.
AU - Panzieri, D.
AU - Parsamyan, B.
AU - Paul, S.
AU - Peng, J. C.
AU - Pereira, F.
AU - Pešek, M.
AU - Peshekhonov, D. V.
AU - Pierre, N.
AU - Platchkov, S.
AU - Pochodzalla, J.
AU - Polyakov, V. A.
AU - Pretz, J.
AU - Quaresma, M.
AU - Ziembicki, M.
AU - Zink, A.
AU - Regali, C.
AU - Reicherz, G.
AU - Riedl, C.
AU - Roskot, M.
AU - Rogacheva, N. S.
AU - Ryabchikov, D. I.
AU - Rybnikov, A.
AU - Rychter, A.
AU - Salac, R.
AU - Samoylenko, V. D.
AU - Sandacz, A.
AU - Santos, C.
AU - Sarkar, S.
AU - Savin, I. A.
AU - Sawada, T.
AU - Sbrizzai, G.
AU - Schiavon, P.
AU - Schmidt, K.
AU - Schmieden, H.
AU - Schönning, K.
AU - Seder, E.
AU - Selyunin, A.
AU - Silva, L.
AU - Sinha, L.
AU - Sirtl, S.
AU - Slunecka, M.
AU - Smolik, J.
AU - Srnka, A.
AU - Steffen, D.
AU - Stolarski, M.
AU - Subrt, O.
AU - Sulc, M.
AU - Suzuki, H.
AU - Szabelski, A.
AU - Szameitat, T.
AU - Sznajder, P.
AU - Takekawa, S.
AU - Tasevsky, M.
AU - Tessaro, S.
AU - Tessarotto, F.
AU - Thibaud, F.
AU - Thiel, A.
AU - Tosello, F.
AU - Tskhay, V.
AU - Uhl, S.
AU - Vauth, A.
AU - Veloso, J.
AU - Virius, M.
AU - Vondra, J.
AU - Wallner, S.
AU - Weisrock, T.
AU - Wilfert, M.
AU - ter Wolbeek, J.
AU - Zaremba, K.
AU - Zavada, P.
AU - Zavertyaev, M.
AU - Zemlyanichkina, E.
AU - Zhuravlev, N.
N1 - Publisher Copyright: © 2017 The Author(s) Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
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
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
SN - 0370-2693
ER -