I – Experimental investigation of transverse spin asymmetries in μ-p SIDIS processes: Collins asymmetries

Adolph, C.; Alekseev, M. G.; Alexakhin, V. Y. u.; Alexandrov, Y. u.; Alexeev, G. D.; Amoroso, Antonio; Antonov, A. A.; Austregesilo, A.; Badełek, B.; Balestra, Ferruccio; Barth, J.; Baum, G.; Bedfer, Y.; Bernhard, J.; Bertini, Raimondo Pietro; Bettinelli, M.; Bicker, K.; Bieling, J.; Birsa, R.; Bisplinghoff, J.; Bordalo, P.; Bradamante, F.; Braun, C.; Bravar, A.; Bressan, A.; Büchele, M.; Burtin, E.; Capozza, L.; Chiosso, Michela; Chung, S. U.; Cicuttin, A.; Crespo, M. L.; Dalla Torre, S.; Das, S.; Dasgupta, S. S.; Dasgupta, S.; Denisov, O. Y. u.; Dhara, L.; Donskov, S. V.; Doshita, N.; Duic, V.; Dünnweber, W.; Dziewiecki, M.; Efremov, A.; Elia, C.; Eversheim, P. D.; Eyrich, W.; Faessler, M.; Ferrero, A.; Filin, A.; Finger, M.; Finger, M.; Fischer, H.; Franco, C.; du Fresne von Hohenesche, N.; Friedrich, J. M.; Frolov, V.; Garfagnini, Raffaello; Gautheron, F.; Gavrichtchouk, O. P.; Gerassimov, S.; Geyer, R.; Giorgi, M.; Gnesi, Ivan; Gobbo, B.; Goertz, S.; Grabmüller, S.; Grasso, Antonino; Grube, B.; Gushterski, R.; Guskov, A.; Guthörl, T.; Haas, F.; von Harrach, D.; Heinsius, F. H.; Herrmann, F.; Heß, C.; Hinterberger, F.; Horikawa, N.; Höppner, C. h.; Dʼhose, N.; Huber, S.; Ishimoto, S.; Ivanov, O.; Ivanshin, Y. u.; Iwata, T.; Jahn, R.; Jary, V.; Jasinski, P.; Joosten, R.; Kabuß, E.; Kang, D.; Ketzer, B.; Khaustov, G. V.; Khokhlov, Y. u. A.; Kisselev, Y. u.; Klein, F.; Klimaszewski, K.; Koblitz, S.; Koivuniemi, J. H.; Kolosov, V. N.; Kondo, K.; Königsmann, K.; Konorov, I.; Konstantinov, V. F.; Korzenev, A.; Kotzinian, A. M.; Kouznetsov, O.; Krämer, M.; Kroumchtein, Z. V.; Kunne, F.; Kurek, K.; Lauser, L.; Lednev, A. A.; Lehmann, A.; Levorato, S.; Lichtenstadt, J.; Liska, T.; Maggiora, A.; Magnon, A.; Makke, N.; Mallot, G. K.; Mann, A.; Marchand, C.; Martin, A.; Marzec, J.; Matsuda, T.; Meshcheryakov, G.; Meyer, W.; Michigami, T.; Mikhailov, Y. u. V.; Morreale, A.; Mutter, A.; Nagaytsev, A.; Nagel, T.; Negrini, T.; Nerling, F.; Neubert, S.; Neyret, D.; Nikolaenko, V. I.; Nowak, W. D.; Nunes, A. S.; Olshevsky, A. G.; Ostrick, M.; Padee, A.; Panknin, R.; Panzieri, Daniele; Parsamyan, Bakur; Paul, S.; Perevalova, E.; Pesaro, G.; Peshekhonov, D. V.; Piragino, Guido; Platchkov, S.; Pochodzalla, J.; Polak, J.; Polyakov, V. A.; Pretz, J.; Quaresma, M.; Quintans, C.; Rajotte, J. F.; Ramos, S.; Rapatsky, V.; Reicherz, G.; Richter, A.; Rocco, E.; Rondio, E.; Rossiyskaya, N. S.; Ryabchikov, D. I.; Samoylenko, V. D.; Sandacz, A.; Sapozhnikov, M. G.; Sarkar, S.; Savin, I. A.; Sbrizzai, G.; Schiavon, P.; Schill, C.; Schlüter, T.; Schmidt, K.; Schmitt, L.; Schönning, K.; Schopferer, S.; Schott, M.; Schröder, W.; Shevchenko, O. Y. u.; Silva, L.; Sinha, L.; Sissakian, A. N.; Slunecka, M.; Smirnov, G. I.; Sosio, Stefano; Sozzi, F.; Srnka, A.; Steiger, L.; Stolarski, M.; Sulc, M.; Sulej, R.; Suzuki, H.; Sznajder, P.; Takekawa, S.; Ter Wolbeek, J.; Tessaro, S.; Tessarotto, F.; Tkatchev, L. G.; Uhl, S.; Uman, I.; Vandenbroucke, M.; Virius, M.; Vlassov, N. V.; Wang, L.; Wilfert, M.; Windmolders, R.; Wiślicki, W.; Wollny, H.; Zaremba, K.; Zavertyaev, M.; Zemlyanichkina, E.; Ziembicki, M.; Zhuravlev, N.; Zvyagin, A.

doi:10.1016/j.physletb.2012.09.055

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The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV μ+ beam and a transversely polarised NH3 target. The Collins asymmetry of the proton was extracted in the Bjorken x range 0.003 < x < 0.7. These new precise measurements confirm previous measurements from the COMPASS and HERMES Collaborations, which exhibit a definite effect in the valence quark region. The asymmetries for negative and positive hadrons are similar in magnitude and opposite in sign. They are compatible with model calculations in which the u-quark transversity is opposite in sign and somewhat larger than the d-quark transversity distribution function. The asymmetry is extracted as a function of Bjorken x, the relative hadron energy z and the hadron transverse momentum p^h_T . The high statistics and quality of the data also allow for more detailed investigations of the dependence on the kinematic variables. These studies confirm the leading-twist nature of the Collins asymmetry.

Titolo:	I – Experimental investigation of transverse spin asymmetries in μ-p SIDIS processes: Collins asymmetries
Autori Riconosciuti:	C. Adolph M. G. Alekseev V. Y.u. Alexakhin Y.u. Alexandrov G. D. Alexeev AMOROSO, Antonio A. A. Antonov A. Austregesilo B. Badełek BALESTRA, Ferruccio J. Barth G. Baum Y. Bedfer J. Bernhard BERTINI, Raimondo Pietro 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 CHIOSSO, Michela S. U. Chung A. Cicuttin M. L. Crespo S. Dalla Torre S. Das S. S. Dasgupta S. Dasgupta O. Y.u. 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 GARFAGNINI, Raffaello F. Gautheron O. P. Gavrichtchouk S. Gerassimov R. Geyer M. Giorgi GNESI, IVAN B. Gobbo S. Goertz S. Grabmüller GRASSO, Antonino B. Grube R. Gushterski A. Guskov T. Guthörl F. Haas D. von Harrach F. H. Heinsius F. Herrmann C. Heß F. Hinterberger N. Horikawa C.h. Höppner N. dʼHose S. Huber S. Ishimoto O. Ivanov Y.u. Ivanshin T. Iwata R. Jahn V. Jary P. Jasinski R. Joosten E. Kabuß D. Kang B. Ketzer G. V. Khaustov Y.u. A. Khokhlov Y.u. 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 Y.u. V. Mikhailov 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 PANZIERI, Daniele PARSAMYAN, BAKUR S. Paul E. Perevalova G. Pesaro D. V. Peshekhonov PIRAGINO, Guido 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. Y.u. Shevchenko L. Silva L. Sinha A. N. Sissakian M. Slunecka G. I. Smirnov SOSIO, Stefano 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 mostra contributor esterni nascondi contributor esterni
Autori:	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. Huber;S. Ishimoto;O. Ivanov;Yu. Ivanshin;T. Iwata;R. Jahn;V. Jary;P. Jasinski;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;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
Data di pubblicazione:	2012
Abstract:	The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV μ+ beam and a transversely polarised NH3 target. The Collins asymmetry of the proton was extracted in the Bjorken x range 0.003 < x < 0.7. These new precise measurements confirm previous measurements from the COMPASS and HERMES Collaborations, which exhibit a definite effect in the valence quark region. The asymmetries for negative and positive hadrons are similar in magnitude and opposite in sign. They are compatible with model calculations in which the u-quark transversity is opposite in sign and somewhat larger than the d-quark transversity distribution function. The asymmetry is extracted as a function of Bjorken x, the relative hadron energy z and the hadron transverse momentum p^h_T . The high statistics and quality of the data also allow for more detailed investigations of the dependence on the kinematic variables. These studies confirm the leading-twist nature of the Collins asymmetry.
Volume:	717
Pagina iniziale:	376
Pagina finale:	382
Digital Object Identifier (DOI):	10.1016/j.physletb.2012.09.055
URL:	http://arxiv.org/abs/1205.5121
Parole Chiave:	COMPASS; spin asymmetries; SIDIS; Collins asymmetries; μ-p SIDIS
Rivista:	PHYSICS LETTERS. SECTION B
Appare nelle tipologie:	03A-Articolo su Rivista

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