The transverse target spin azimuthal asymmetry in hard exclusive production of ρ0 mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E^q, which are related to the orbital angular momentum of quarks in the nucleon. The Q^2, x_Bj and squared transverse momentum (p^2_T) dependence of azimuthal asymmetry is presented in a wide kinematic range: 1 (GeV/c)^2 < Q^2 < 10 (GeV/c)^2, 0.003<x_Bj<0.3 and 0.05 (GeV/c)^ < p^2_T < 0.5 (GeV/c)^2 for protons or 0.10 (GeV/c)^ < p^2_T < 0.5 (GeV/c)^2 for deuterons. Results for deuterons are obtained for the first time. The measured asymmetry is small in the whole kinematic range for both protons and deuterons, which is consistent with the theoretical interpretation that contributions from GPDs E^u and E^d approximately cancel.

Exclusive rho^0 muoproduction on transversely polarised protons and deuterons

AMOROSO, Antonio;BALESTRA, Ferruccio;BERTINI, Raimondo Pietro;CHIOSSO, Michela;GARFAGNINI, Raffaello;GNESI, IVAN;GRASSO, Antonino;PANZIERI, Daniele;PARSAMYAN, BAKUR;PIRAGINO, Guido;SOSIO, Stefano;
2012-01-01

Abstract

The transverse target spin azimuthal asymmetry in hard exclusive production of ρ0 mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E^q, which are related to the orbital angular momentum of quarks in the nucleon. The Q^2, x_Bj and squared transverse momentum (p^2_T) dependence of azimuthal asymmetry is presented in a wide kinematic range: 1 (GeV/c)^2 < Q^2 < 10 (GeV/c)^2, 0.003
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COMPASS; polarized beam; POLARIZED TARGET
C. Adolph;M.G. Alekseev;V.Yu. Alexakhin;Yu. Alexandrov;G.D. Alexeev;A. Amoroso;A.A. Antonov;A. Austregesilo;B. Badełek;F. Balestra;J. Barth;G. Baum;Y. Bedfer;J. Bernhard;R. Bertini;M. Bettinelli;K. Bicker;J. Bieling;R. Birsa;J. Bisplinghoff;P. Bordalo;F. Bradamante;C. Braun;A. Bravar;A. Bressan;M. Büchele;E. Burtin;L. Capozza;M. Chiosso;S.U. Chung;A. Cicuttin;M.L. Crespo;S. Dalla Torre;S. Das;S.S. Dasgupta;S. Dasgupta;O.Yu. Denisov;L. Dhara;S.V. Donskov;N. Doshita;V. Duic;W. Dünnweber;M. Dziewiecki;A. Efremov;C. Elia;P.D. Eversheim;W. Eyrich;M. Faessler;A. Ferrero;A. Filin;M. Finger;M. Finger;H. Fischer;C. Franco;N. du Fresne von Hohenesche;J.M. Friedrich;V. Frolov;R. Garfagnini;F. Gautheron;O.P. Gavrichtchouk;S. Gerassimov;R. Geyer;M. Giorgi;I. Gnesi;B. Gobbo;S. Goertz;S. Grabmüller;A. Grasso;B. Grube;R. Gushterski;A. Guskov;T. Guthörl;F. Haas;D. von Harrach;F.H. Heinsius;F. Herrmann;C. Heß;F. Hinterberger;N. Horikawa;Ch. Höppner;N. dʼHose;S. Ishimoto;O. Ivanov;Yu. Ivanshin;T. Iwata;R. Jahn;V. Jary;P. Jasinski;G. Jegou;R. Joosten;E. Kabuß;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;I. Konorov;V.F. Konstantinov;A. Korzenev;A.M. Kotzinian;O. Kouznetsov;M. Krämer;Z.V. Kroumchtein;F. Kunne;K. Kurek;L. Lauser;A.A. Lednev;A. Lehmann;S. Levorato;J. Lichtenstadt;T. Liska;A. Maggiora;A. Magnon;N. Makke;G.K. Mallot;A. Mann;C. Marchand;A. Martin;J. Marzec;T. Matsuda;G. Meshcheryakov;W. Meyer;T. Michigami;Yu.V. Mikhailov;M.A. Moinester;A. Morreale;A. Mutter;A. Nagaytsev;T. Nagel;T. Negrini;F. Nerling;S. Neubert;D. Neyret;V.I. Nikolaenko;W.-D. Nowak;A.S. Nunes;A.G. Olshevsky;M. Ostrick;A. Padee;R. Panknin;D. Panzieri;B. Parsamyan;S. Paul;E. Perevalova;G. Pesaro;D.V. Peshekhonov;G. Piragino;S. Platchkov;J. Pochodzalla;J. Polak;V.A. Polyakov;J. Pretz;M. Quaresma;C. Quintans;J.-F. Rajotte;S. Ramos;V. Rapatsky;G. Reicherz;A. Richter;E. Rocco;E. Rondio;N.S. Rossiyskaya;D.I. Ryabchikov;V.D. Samoylenko;A. Sandacz;M.G. Sapozhnikov;S. Sarkar;I.A. Savin;G. Sbrizzai;P. Schiavon;C. Schill;T. Schlüter;K. Schmidt;L. Schmitt;K. Schönning;S. Schopferer;M. Schott;W. Schröder;O.Yu. Shevchenko;L. Silva;L. Sinha;A.N. Sissakian;M. Slunecka;G.I. Smirnov;S. Sosio;F. Sozzi;A. Srnka;L. Steiger;M. Stolarski;M. Sulc;R. Sulej;H. Suzuki;P. Sznajder;S. Takekawa;J. Ter Wolbeek;S. Tessaro;F. Tessarotto;L.G. Tkatchev;S. Uhl;I. Uman;M. Vandenbroucke;M. Virius;N.V. Vlassov;L. Wang;M. Wilfert;R. Windmolders;W. Wiślicki;H. Wollny;K. Zaremba;M. Zavertyaev;E. Zemlyanichkina;M. Ziembicki;N. Zhuravlev;A. Zvyagin
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/118264
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