/ hep-ex CERN-EP-2016-157


Exclusive $\omega$ meson muoproduction on transversely polarised protons


Adolph, C. (Erlangen - Nuremberg U.) ; Agarwala, J. ; Aghasyan, M. (Frascati) ; Akhunzyanov, R. (Dubna, JINR) ; Alexeev, M.G. (Turin U.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (Turin U.) ; Andrieux, V. (IRFU, SPhN, Saclay) ; Anfimov, N.V. (Dubna, JINR) ; Anosov, V. (Dubna, JINR) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Austregesilo, A. (Munich, Tech. U.) ; Azevedo, C.D.R. (U. Aveiro (main)) ; Badelek, B. (Warsaw U.) ; Balestra, F. (Turin Polytechnic) ; Barth, J. (Bonn U.) ; Beck, R. (Bonn U., HISKP) ; Bedfer, Y. (IRFU, Saclay) ; Bernhard, J. (Munich U.) ; Bicker, K. (Munich, Tech. U.) ; Bielert, E.R. (CERN) ; Birsa, R. (Trieste U.) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bodlak, M. (Prague, Tech. U.) ; Boer, M. (Cote d'Azur Observ., Nice) ; Bordalo, P. (LIP, Lisbon) ; Bradamante, F. (Trieste U.) ; Braun, C. (London, City U.) ; Bressan, A. (Trieste U.) ; Buechele, M. (Freiburg U.) ; Chang, W. -C. (Academia Sinica, Taiwan) ; Chatterjee, C. ; Chiosso, M. (Turin U.) ; Choi, I. (Illinois U., Urbana) ; Chung, S. -U. (Pusan Natl. U.) ; Cicuttin, A. (INFN, Trieste) ; Crespo, M.L. (INFN, Trieste) ; Curiel, Q. (IRFU, SPhN, Saclay) ; Dalla Torre, S. ; Dasgupta, S.S. (Matrivani Inst., Calcutta) ; Dasgupta, S. (INFN, Trieste) ; Denisov, O. Yu. (Turin U.) ; Dhara, L. (Matrivani Inst., Calcutta) ; Donskov, S.V. (Serpukhov, IHEP) ; Doshita, N. (Yamagata U.) ; Duic, V. (Trieste U.) ; Duennweber, W. (Munich U.) ; Dziewiecki, M. (Warsaw U. of Tech.) ; Efremov, A. (Dubna, JINR) ; Eversheim, P.D. (Bonn U., HISKP) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Faessler, M. (Munich U.) ; Ferrero, A. (IRFU, SPhN, Saclay) ; Finger, M. (Charles U.) ; Fischer, H. (Freiburg U.) ; Franco, C. (LIP, Lisbon) ; von Hohenesche, N. du Fresne (Mainz U.) ; Friedrich, J.M. (Munich, Tech. U.) ; Frolov, V. (Dubna, JINR) ; Fuchey, E. (IRFU, SPhN, Saclay) ; Gautheron, F. (Ruhr U., Bochum) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gerassimov, S. (Munich, Tech. U.) ; Giordano, F. (INFN, Bari) ; Gnesi, I. (Turin U.) ; Gorzellik, M. (Freiburg U.) ; Grabmueller, S. (Munich, Tech. U.) ; Grasso, A. (Turin U.) ; Grosse Perdekamp, M. (Illinois U., Urbana) ; Grube, B. (Munich, Tech. U.) ; Grussenmeyer, T. (Freiburg U.) ; Guskov, A. (Dubna, JINR) ; Haas, F. (Munich, Tech. U.) ; Hahne, D. (Bonn U.) ; von Harrach, D. ; Hashimoto, R. (Tohoku U.) ; Heinsius, F.H. (Ruhr U., Bochum (main)) ; Heitz, R. (Illinois U., Urbana) ; Herrmann, F. (Freiburg U.) ; Hinterberger, F. (Bonn U., HISKP) ; Horikawa, N. (Zurich, ETH) ; dHose, N. (IRFU, Saclay) ; Hsieh, C. -Y. (Taiwan, Inst. Phys.) ; Huber, S. (Munich, Tech. U.) ; Ishimoto, S. (Yamagata U.) ; Ivanov, A. (Kansas State U.) ; Ivanshin, Yu. (Dubna, JINR) ; Iwata, T. (Yamagata U.) ; Jahn, R. (Bonn U., HISKP) ; Jary, V. (Prague, Tech. U.) ; Joosten, R. (Bonn U., HISKP) ; Joerg, P. (Freiburg U.) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Ketzer, B. (Bonn U., HISKP) ; Khaustov, G.V. (Serpukhov, IHEP) ; Khokhlov, Yu. A. (Serpukhov, IHEP) ; Kisselev, Yu. (Dubna, JINR) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (Warsaw, Inst. Nucl. Studies) ; Koivuniemi, J.H. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Kolosov, V.N. (Serpukhov, IHEP) ; Kondo, K. (Yamagata U.) ; Koenigsmann, K. (Freiburg U.) ; Konorov, I. (Munich, Tech. U.) ; Konstantinov, V.F. (Kurchatov Inst., Moscow) ; Kotzinian, A.M. (Turin U.) ; Kouznetsov, O.M. (Dubna, JINR) ; Kraemer, M. (RWTH Aachen U.) ; Kremser, P. (Freiburg U.) ; Krinner, F. (Munich, Tech. U.) ; Kroumchtein, Z.V. (Dubna, JINR) ; Kulinich, Y. (Illinois U., Urbana) ; Kunne, F. (IRFU, SPhN, Saclay) ; Kurek, K. (NCBJ, Swierk) ; Kurjata, R.P. (Warsaw U., Inst. Radioelect.) ; Lednev, A.A. (Serpukhov, IHEP) ; Lehmann, A. (Erlangen - Nuremberg U.) ; Levillain, M. (IRFU, SPhN, Saclay) ; Levorato, S. (Trieste U.) ; Lian, Y. -S. ; Lichtenstadt, J. (Tel Aviv U.) ; Longo, R. (U. Turin, Exp. Phys.) ; Maggiora, A. (Turin U.) ; Magnon, A. (IRFU, Saclay) ; Makins, N. (Argonne, HEP) ; Makke, N. (IRFU, Saclay) ; Mallot, G.K. (CERN) ; Marchand, C. (IRFU, Saclay) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Martin, A. (Yale U.) ; Marzec, J. (Warsaw U. of Tech.) ; Matousek, J. (Charles U.) ; Matsuda, H. (Bonn U., HISKP) ; Matsuda, T. (Miyazaki U.) ; Meshcheryakov, G.V. (Dubna, JINR) ; Meyer, M. (Hamburg U.) ; Meyer, W. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Michigami, T. (Bonn U., HISKP) ; Mikhailov, Yu. V. (Serpukhov, IHEP) ; Mikhasenko, M. (Serpukhov, IHEP) ; Mitrofanov, E. ; Mitrofanov, N. ; Miyachi, Y. (Yamagata U.) ; Montuenga, P. (Illinois U., Urbana (main)) ; Nagaytsev, A. (Dubna, JINR) ; Nerling, F. (Mainz U., Inst. Phys.) ; Neyret, D. (IRFU, Saclay) ; Nikolaenko, V.I. (Kurchatov Inst., Moscow) ; Novy, J. (Prague, Tech. U.) ; Nowak, W. -D. (DESY, Zeuthen) ; Nukazuka, G. (Yamagata U.) ; Nunes, A.S. (Porto U., Astron. Dept.) ; Olshevsky, A.G. (Dubna, JINR) ; Orlov, I. (Dubna, JINR) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Panzieri, D. (Turin U.) ; Parsamyan, B. (Turin U.) ; Paul, S. (Munich, Tech. U.) ; Peng, J. -C. (Illinois U., Urbana) ; Pereira, F. (Aveiro U.) ; Pesek, M. (Charles U.) ; Peshekhonov, D.V. (Dubna, JINR) ; Pierre, N. ; Platchkov, S. (IRFU, Saclay) ; Pochodzalla, J. (Mainz U.) ; Polyakov, V.A. (Serpukhov, IHEP) ; Pretz, J. (Penn State U.) ; Quaresma, M. (LIP, Lisbon) ; Quintans, C. (LIP, Lisbon) ; Ramos, S. (LIP, Lisbon) ; Regali, C. (Freiburg U.) ; Reicherz, G. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Riedl, C. (Illinois U., Urbana) ; Roskot, M. (Charles U., Prague) ; Ryabchikov, D.I. (Kurchatov Inst., Moscow) ; Rybnikov, A. (Dubna, JINR) ; Rychter, A. (Warsaw U. of Tech., Inst. Radioelectr.) ; Salac, R. (Prague, Tech. U.) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Sandacz, A. (Warsaw, Inst. Nucl. Studies) ; Santos, C. (INFN, Trieste) ; Sarkar, S. (King's Coll. London) ; Savin, I.A. (CERN) ; Sawada, T. (Tokyo U. of Education) ; Sbrizzai, G. (Trieste U.) ; Schiavon, P. (Trieste U.) ; Schmidt, K. (Silesia U.) ; Schmieden, H. (Bonn U.) ; Schoenning, K. (Uppsala U.) ; Schopferer, S. (Freiburg U.) ; Seder, E. (UConn, Storrs) ; Selyunin, A. (Dubna, JINR) ; Shevchenko, O. Yu. (Dubna, JINR) ; Silva, L. (LIP, Lisbon) ; Sinha, L. (Matrivani Inst., Calcutta) ; Sirtl, S. (Freiburg U.) ; Slunecka, M. (DESY, Zeuthen) ; Smolik, J. (Prague, Inst. Phys.) ; Sozzi, F. (Darmstadt, EMMI) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Steffen, D. (CERN) ; Stolarski, M. (LIP, Lisbon) ; Sulc, M. (Liberec Tech. U.) ; Suzuki, H. (Nishina Ctr., RIKEN) ; Szabelski, A. (Bonn U., HISKP) ; Szameitat, T. (Freiburg U.) ; Sznajder, P. (Warsaw, Inst. Nucl. Studies) ; Takekawa, S. (Turin U.) ; Tasevsky, M. (Prague, Inst. Phys.) ; Tessaro, S. (Trieste U.) ; Tessarotto, F. (INFN, Trieste) ; Thibaud, F. (IRFU, SPhN, Saclay) ; Tosello, F. (INFN, Turin) ; Tskhay, V. (LPI, Moscow (main)) ; Uhl, S. (Munich, Tech. U.) ; Veloso, J. (Aveiro U.) ; Virius, M. (Prague, Tech. U.) ; Vondra, J. (Prague, Tech. U.) ; Wallner, S. (Munich, Tech. U.) ; Weisrock, T. (Mainz U., Inst. Kernphys.) ; Wilfert, M. (Mainz U., Inst. Kernphys.) ; ter Wolbeek, J. (Freiburg U.) ; Zaremba, K. (Warsaw U. of Tech.) ; Zavada, P. (Prague, Inst. Phys.) ; Zavertyaev, M. (Lebedev Inst.) ; Zemlyanichkina, E. (Dubna, JINR) ; Ziembicki, M. (Warsaw U. of Tech.) ; Zink, A. (Erlangen - Nuremberg U.)

Pages: 23

Abstract: Exclusive production of $\omega$ mesons was studied at the COMPASS experiment by scattering $160~\mathrm{GeV}/\mathit{c}$ muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality $1~(\mathrm{GeV}/\mathit{c})^2 < Q^2 < 10~(\mathrm{GeV}/\mathit{c})^2$, Bjorken scaling variable $0.003 < x_{\mathit{Bj}} < 0.3$ and transverse momentum squared of the $\omega$ meson $0.05~(\mathrm{GeV}/\mathit{c})^2 < p_{T}^{2} < 0.5~(\mathrm{GeV}/\mathit{c})^2$. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) $E$ that are related to the orbital angular momentum of quarks, the chiral-odd GPDs $H_{T}$ that are related to the transversity Parton Distribution Functions, and the sign of the $\pi\omega$ transition form factor. The results are compared to recent calculations of a GPD-based model.

Web-Page: http://inspirehep.net/record/1469063/files/results.png; http://inspirehep.net/record/1469063/files/Emiss.png; http://inspirehep.net/record/1469063/files/Mgammagamma.png; http://inspirehep.net/record/1469063/files/pT2.png; http://inspirehep.net/record/1469063/files/H_vs_C_leg.png; http://inspirehep.net/record/1469063/files/Mpipipi.png; http://inspirehep.net/record/1469063/files/zPV.png; http://inspirehep.net/record/1469063/files/RD_MCisCorr_fit.png; http://inspirehep.net/record/1469063/files/angles.png; http://inspirehep.net/record/1469063/files/canA.png; http://inspirehep.net/record/1469063/files/arXiv:1606.03725.pdf


Note: 23 pages, 9 figures

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