D* and D Meson Production in Muon Nucleon Interactions at 160 GeV/c

C. Adolph , M. G. Alekseev , V. Yu. Alexakhin , Yu. Alexandrov , G. D. Alexeev , A. Amoroso , A. A. Antonov , A. Austregesilo

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B. Badelek F. Balestra J. Barth G. Baum Y. Bedfer A. Berlin 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. Buechele 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. Duennweber M. Dziewiecki A. Efremov C. Elia P. D. Eversheim W. Eyrich M. Faessler A. Ferrero A. Filin M. Finger M. Finger Jr 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. Grabmueller A. Grasso B. Grube R. Gushterski A. Guskov T. Guthoerl F. Haas D. von Harrach F. H. Heinsius F. Herrmann C. Hess F. Hinterberger N. Horikawa Ch. Hoeppner N. d'Hose 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. Koenigsmann I. Konorov V. F. Konstantinov A. Korzenev A. M. Kotzinian O. Kouznetsov M. Kraemer 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 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 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. Schlueter A. Schmidt K. Schmidt L. Schmitt H. Schmieden K. Schoenning S. Schopferer M. Schott 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 T. Weisrock M. Wilfert R. Windmolders W. Wislicki H. Wollny K. Zaremba M. Zavertyaev E. Zemlyanichkina M. Ziembicki N. Zhuravlev A. Zvyagin

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classification ✦ hep-ex

keywords productionanticross-sectiondetectedenergyeventsmesonsobserved

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The production of D* and D mesons in inelastic scattering of 160 GeV/c muons off a ^6LiD target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c)^2 < Q^2 < 10 (GeV/c)^2 and 3x10^-5< x_Bj < 0.1. The study is based on 8100 events where a D^0 or anti D^0 is detected subsequently to a D*+ or D*- decay, and on 34000 events, where only a D^0 or anti D^0 is detected. Kinematic distributions of D*, D and K*_2 are given as a function of their energy E, transverse momentum p_T, energy fraction z, and of the virtual photon variables nu, Q^2 and x_Bj. Semi-inclusive differential D* production cross-sections are compared with theoretical predictions for D* production via photon-gluon fusion into open charm. The total observed production cross-section for D*+/- mesons with laboratory energies between 22 and 86 GeV is 1.9 nb. Significant cross-section asymmetries are observed between D*+ and D*- production for nu<40 GeV and z>0.6.

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D* and D Meson Production in Muon Nucleon Interactions at 160 GeV/c

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