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1. Measurement of D0, D+, Ds + and D*+ production in fixed target 920 GeV proton–nucleus collisions

Author

Laura Silva, D. Goloubkov, I. Matchikhilian, Maurizio Piccinini, V. Egorytchev, S. Solunin, I. Abt, R. Pernack, M. Mevius, F. Sanchez, Peter Robmann, P. Kreuzer, B. Schwenninger, H. B. Dreis, Vladimir Popov, C. B. Krauss, I. Belotelov, H. S. Subramania, D. Skrk, M. Schmelling, U. Schwanke, B. Lomonosov, Dmitry Emeliyanov, Marcus Hohlmann, S. De Castro, K. M. Danielsen, Reinhard Männer, Yu.T. Kiryushin, U. Husemann, M. Medinnis, Y. Pylypchenko, Mikhail Zavertyaev, R. Zimmermann, J. Flammer, I. Rostovtseva, Y. Vassiliev, O. Barsukova, A. H. Walenta, H. Schröder, M. Adams, J. J. Wang, S. Shuvalov, Z. Zheng, M. Ispiryan, T. Živko, S. Gradl, Thomas Lohse, Mauro Villa, S. Essenov, E. B. Klinkby, S. Keller, S. Somov, S. Karabekyan, M. Bräuer, M. Walter, Aleksandar Aleksandrov, A. Gellrich, F. Eisele, M. Ouchrif, O. Gouchtchine, R. Muresan, M. Nörenberg, N.N. Karpenko, Vladislav Balagura, G. Bohm, J.D. Hansen, Laura Fabbri, J. Groth-Jensen, Hermann Kolanoski, J. Bastos, Imma Riu, António Amorim, C. Padilla, H. Deppe, P. Križan, V. Rybnikov, S. Kupper, I. Tikhomirov, A. Golutvin, B. Bobchenko, K. T. Knöpfle, C. van Eldik, Andrej Gorišek, Nicola Semprini-Cesari, A. Belkov, L. Garrido, M. Negodaev, C. Stegmann, A. Bogatyrev, M. Feuerstack-Raible, Mogens Dam, A. Schreiner, A. Vitale, T. Buran, J. Gläß, D. Krücker, I. Kisel, J. Spengler, S. Xella-Hansen, B. A. Petersen, Pietro Faccioli, Yu. A. Golubkov, V. Aushev, B. Fominykh, I. Tsakov, Yu.V. Mikhailov, A. Lanyov, R. Spighi, F. Sciacca, F. Grimaldi, S. Korpar, C. Bauer, D. C. Goulart, D. Reßing, M. Symalla, A. J. Schwartz, Jose M Hernandez, R. Pestotnik, Werner Hofmann, A. Michetti, H. Albrecht, M. Böcker, Marco Bruschi, I. Gorbounov, A. Bertin, B. Lewendel, Peter Buchholz, B. Schmidt, R. Mankel, B. Giacobbe, Y. Bagaturia, R. Wurth, D. Pose, Y. Guilitsky, S. Prystupa, Wouter Hulsbergen, K. Ehret, M. Funcke, J. Kessler, Antonio Sbrizzi, S. J. Aplin, Helmut Wolters, B. Schwingenheuer, Farid Ould-Saada, T. Jagla, X. Dong, F. Khasanov, S. Masciocchi, T. Kvaratskheliia, J. Batista, M. Danilov, J. Pyrlik, R. Mizuk, O. Igonkina, M. zur Nedden, M. Poli, Kwong Lau, M. Starič, A. S. Schwarz, Alexander Spiridonov, U. Uwer, Valery Pugatch, D. Peralta, A. Zhelezov, M. Bruinsma, A. Somov, Kendall Reeves, Aleš Stanovnik, G. Medin, I. Vukotic, João Carvalho, H. Rick, H. Kapitza, T. Zeuner, Antonio Zoccoli, I. Massa, Vasco Amaral, A. Wurz, T. Hott, P. Conde, Igor Golutvin, Yu. Zaitsev, C. Cruse, M. A. Pleier, Th. Bauer, Sebastian Nowak, D. Wegener, H. Wahlberg, W. Gradl, C. Jiang, M. Bargiotti, M. T. Nunez Pardo de Vera, M. Agari, Ulrich Werthenbach, L. Sozuer, Maksym Titov, I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, A. AMORIM, S.J. APLIN, V. AUSHEV, Y. BAGATURIA, V. BALAGURA, M. BARGIOTTI, O. BARSUKOVA, J. BASTOS, J. BATISTA, C. BAUER, TH.S. BAUER, A. BELKOV, AR. BELKOV, I. BELOTELOV, A. BERTIN, B. BOBCHENKO, M. BOCKER, A. BOGATYREV, G. BOHM, M. BRAUER, M. BRUINSMA, M. BRUSCHI, P. BUCHHOLZ, T. BURAN, J. CARVALHO, P. CONDE, C. CRUSE, M. DAM, K.M. DANIELSEN, M. DANILOV, S. DE CASTRO, H. DEPPE, X. DONG, H.B. DREIS, V. EGORYTCHEV, K. EHRET, F. EISELE, D. EMELIYANOV, S. ESSENOV, L. FABBRI, P. FACCIOLI, M. FEUERSTACK-RAIBLE, J. FLAMMER, B. FOMINYKH, M. FUNCKE, LL. GARRIDO, A. GELLRICH, B. GIACOBBE, J. GLA), D. GOLOUBKOV, Y. GOLUBKOV, A. GOLUTVIN, I. GOLUTVIN, I. GORBOUNOV, A. GORISEK, O. GOUCHTCHINE, D.C. GOULART, S. GRADL, W. GRADL, F. GRIMALDI, J. GROTH-JENSEN, YU. GUILITSKY, J.D. HANSEN, J.M. HERNANDEZ, W. HOFMANN, M. HOHLMANN, T. HOTT, W. HULSBERGEN, U. HUSEMANN, O. IGONKINA, M. ISPIRYAN, T. JAGLA, C. JIANG, H. KAPITZA, S. KARABEKYAN, N. KARPENKO, S. KELLER, J. KESSLER, F. KHASANOV, YU. KIRYUSHIN, I. KISEL, E. KLINKBY, K.T. KNOPFLE, H. KOLANOSKI, S. KORPAR, C. KRAUSS, P. KREUZER, P. KRIZAN, D. KRUCKER, S. KUPPER, T. KVARATSKHELIIA, A. LANYOV, K. LAU, B. LEWENDEL, T. LOHSE, B. LOMONOSOV, R. MANNER, R. MANKEL, S. MASCIOCCHI, I. MASSA, I. MATCHIKHILIAN, G. MEDIN, M. MEDINNIS, M. MEVIUS, A. MICHETTI, YU. MIKHAILOV, R. MIZUK, R. MURESAN, M. ZUR NEDDEN, M. NEGODAEV, M. NORENBERG, S. NOWAK, M.T. NUNEZ PARDO DE VERA, M. OUCHRIF, F. OULD-SAADA, C. PADILLA, D. PERALTA, R. PERNACK, R. PESTOTNIK, B.A. PETERSEN, M. PICCININI, M.A. PLEIER, M. POLI, V. POPOV, D. POSE, S. PRYSTUPA, V. PUGATCH, Y. PYLYPCHENKO, J. PYRLIK, K. REEVES, D. RESSING, H. RICK, I. RIU, P. ROBMANN, I. ROSTOVTSEVA, V. RYBNIKOV, F. SANCHEZ, A. SBRIZZI, M. SCHMELLING, B. SCHMIDT, A. SCHREINER, H. SCHRODER, U. SCHWANKE, A.J. SCHWARTZ, A.S. SCHWARZ, B. SCHWENNINGER, B. SCHWINGENHEUER, F. SCIACCA, N. SEMPRINI-CESARI, S. SHUVALOV, L. SILVA, D. SKRK, L. SOZUER, S. SOLUNIN, A. SOMOV, S. SOMOV, J. SPENGLER, R. SPIGHI, A. SPIRIDONOV, A. STANOVNIK, M. STARIC, C. STEGMANN, H.S. SUBRAMANIA, M. SYMALLA, I. TIKHOMIROV, M. TITOV, I. TSAKOV, U. UWER, C. VAN ELDIK, YU. VASSILIEV, M. VILLA, A. VITALE, I. VUKOTIC, H. WAHLBERG, A.H. WALENTA, M. WALTER, J.J. WANG, D. WEGENER, U. WERTHENBACH, H. WOLTERS, R. WURTH, A. WURZ, S. XELLA-HANSEN, YU. ZAITSEV, M. ZAVERTYAEV, T. ZEUNER, A. ZHELEZOV, Z. ZHENG, R. ZIMMERMANN, T. ZIVKO, and A. ZOCCOLI

Subjects
Mass number, Physics, Particle physics, Physics and Astronomy (miscellaneous), Proton, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, HERA, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, symbols.namesake, 0103 physical sciences, symbols, Feynman diagram, ddc:530, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Storage ring, HERA-B
Abstract

The inclusive production cross sections of the charmed mesons D^0, D^+, D_s^+ and D^{*+} have been measured in interactions of 920 GeV protons on C, Ti, and W targets with the HERA-B detector at the HERA storage ring. Differential cross sections as a function of transverse momentum and Feynman's x variable are given for the central rapidity region and for transverse momenta up to $\pT=3.5$ GeV/$c$. The atomic mass number dependence and the leading to non-leading particle production asymmetries are presented as well., Comment: Submitted to EPJ C

Published
2007
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2. A radiation tolerant phototube power supply for the electromagnetic calorimeter of the HERA- experiment

Author

Pietro Faccioli, E. Novikov, R. Spighi, Antonio Zoccoli, V. Rusinov, S. Meneghini, E. Tarkovsky, M. Zuffa, I. D'Antone, Massimo Piccinini, A. Vitale, M. Capponi, M. Poli, S. Shuvalov, A. Bertin, F. Grimaldi, I. Matchikhilian, G. Avoni, Mauro Villa, M. Bargiotti, Laura Fabbri, S. De Castro, A. Soldatov, I. Massa, B. Giacobbe, Yu. Gilitsky, M. Rizzi, I. Lax, C. Baldanza, O. Gouchtchine, M. Bruschi, A. Golutvin, B. Bobchenko, N. Semprini-Cesari, Yu.V. Mikhailov, G. Avoni, C. Baldanza, M. Bargiotti, A. Bertin, B. Bobchenko, M. Bruschi, M. Capponi, I. D'Antone, S. De Castro, L. Fabbri, P. Faccioli, B. Giacobbe, Yu. Gilitsky, A. Golutvin, O. Gouchtchine, F. Grimaldi, I. Lax, I. Massa, I. Matchikhilian, S. Meneghini, Yu. Mikhailov, E. Novikov, M. Piccinini, M. Poli, M. Rizzi, V. Rusinov, N. Semprini-Cesari, S. Shuvalov, A. Soldatov, R. Spighi, E. Tarkovsky, M. Villa, A. Vitale, A. Zoccoli, and M. Zuffa

Subjects
HERA-B experiment, Physics, Nuclear and High Energy Physics, Photomultiplier, Calorimeter (particle physics), Physics::Instrumentation and Detectors, HERA, Radiation, Phototube, Nuclear physics, Voltage multiplier, ddc:530, High Energy Physics::Experiment, Instrumentation, HERA-B, Shashlik
Abstract

The design of the phototube power supply for the HERA- B Electromagnetic Calorimeter is presented. A choice of the solution on the basis of the Cockcroft–Walton voltage multiplier is validated. Schematics developed are discussed. A special section describes the behaviour of the crucial components under irradiation since radiation tolerance becomes one of the most important items in the severe HERA- B radiation environment. Finally, performance achieved is presented.

Published
2006
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3. Measurement of the J/ψ production cross section in 920 GeV/c fixed-target proton–nucleus interactions

Author

S. Essenov, M. Adams, Samim Erhan, B. Schwenninger, S. De Castro, P. Kreuzer, Laura Fabbri, C. Padilla, M. Negodaev, D. Goloubkov, D. Ressing, Dmitry Emeliyanov, Yu.T. Kiryushin, E. B. Klinkby, Y. Bagaturia, T. Zivko, Z. Zheng, Mogens Dam, L. Garrido, J. Batista, I. Massa, M. Symalla, L. Matchikhilian, M. Feuerstack-Raible, L. Sozuer, K. M. Danielsen, D. Peralta, Wouter Hulsbergen, I. Vukotic, Maksym Titov, M. Braeuer, S. Shuvalov, M. Ispiryan, Y. Vassiliev, S. Masciocchi, S. Gradl, H. Rick, Pietro Faccioli, V. Aushev, A. J. Schwartz, O. Igonkina, O. Barsukova, V. Rybnikov, M. Schmelling, T. Zeuner, C. B. Krauss, Nicola Semprini-Cesari, I. Belotelov, F. Grimaldi, H. S. Subramania, Brian Petersen, Vladislav Balagura, F. Eisele, S. Korpar, Peter Robmann, U. Schwanke, J. Flammer, M. Starič, S. Somov, M. Ouchrif, Y. Guilitsky, A. Aleksandrov, A. Somov, S. Solunin, I. Abt, Mikhail Danilov, M. T. Nunez Pardo de Vera, M. Agari, Ulrich Werthenbach, H. B. Dreis, Marcus Hohlmann, I. Tsakov, C. Cruse, H. Schroeder, U. Husemann, J. Glaess, R. Zimmermann, R. Maenner, M. Mevius, J. Kessler, Antonio Sbrizzi, A. Wurz, B. Fominykh, R. Mizuk, T. Jagla, M. A. Pleier, M. Poli, X. Dong, N.N. Karpenko, Yu.V. Mikhailov, Farid Ould-Saada, Valery Pugatch, V. Egorytchev, M. Walter, G. Medin, C. Stegmann, P. Krizan, V. Popov, Werner Hofmann, T. Hott, P. Conde, Sebastian Nowak, Igor Golutvin, D. Wegener, António Amorim, A. Vitale, D. Kruecker, H. Wahlberg, W. Gradl, C. Bauer, S. Karabekyan, I. Gorbounov, Yu. Zaitsev, M. Funcke, Jose M Hernandez, A. Bogatyrev, C. Jiang, A. Spiridonov, Antonio Zoccoli, A. S. Schwarz, B. Giacobbe, R. Spighi, S. Prystupa, T. Buran, I. Kisel, M. Bargiotti, Thomas Lohse, Vasco Amaral, A. Michetti, I. Rostovtseva, A. H. Walenta, B. Lewendel, C. van Eldik, M. Noerenberg, J. Bastos, H. Deppe, A. Gellrich, O. Gouchtchine, B. Lomonosov, G. Bohm, R. Muresan, A. Stanovnik, Andrej Gorišek, Hermann Kolanoski, M. Medinnis, D. C. Goulart, Bernhard Schmidt, I. Tikhomirov, S. J. Aplin, Th. S. Bauer, R. Pestotnik, B. Schwingenheuer, Marco Bruschi, H. Albrecht, R. Mankel, R. Wurth, D. Pose, J. Pyrlik, S. Kupper, J.D. Hansen, A. Zhelezov, K. T. Knöpfle, J. Spengler, A. Lanyov, H. Wolters, F. Sciacca, F. Khasanov, S. Keller, Y. Pylypchenko, A. Bertin, Peter Buchholz, Laura Silva, Jian Wang, M. Bruinsma, Kendall Reeves, Maurizio Piccinini, Imma Riu, A. Golutvin, B. Bobchenko, R. Pernack, T. Kvaratskheliia, A. Belkov, K. Ehret, A. Schreiner, M. Boecker, M. zur Nedden, Kwong Lau, F. Sanchez, Mikhail Zavertyaev, U. Uwer, Y. Goloubkov, Mauro Villa, João Carvalho, and H. Kapitza

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Proton, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, Nuclear physics, Cross section (physics), medicine.anatomical_structure, 0103 physical sciences, medicine, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon, Nucleus, Lepton, HERA-B
Abstract

The mid-rapidity ( d σ p N / d y at y = 0 ) and total ( σ p N ) production cross sections of Jψ mesons are measured in proton–nucleus interactions. Data collected by the HERA-B experiment in interactions of 920 GeV / c protons with carbon, titanium and tungsten targets are used for this analysis. The Jψ mesons are reconstructed by their decay into lepton pairs. The total production cross section obtained is σ p N J / ψ = 663 ± 74 ± 46 nb / nucleon . In addition, our result is compared with previous measurements.

Published
2006
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4. Polarization of Λ and Λ¯ in 920 GeV fixed-target proton–nucleus collisions

Author

I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S.J. Aplin, V. Aushev, Y. Bagaturia, V. Balagura, M. Bargiotti, O. Barsukova, J. Bastos, J. Batista, C. Bauer, Th.S. Bauer, A. Belkov, Ar. Belkov, I. Belotelov, A. Bertin, B. Bobchenko, M. Böcker, A. Bogatyrev, G. Bohm, M. Bräuer, M. Bruinsma, M. Bruschi, P. Buchholz, T. Buran, J. Carvalho, P. Conde, C. Cruse, M. Dam, K.M. Danielsen, M. Danilov, S. De Castro, H. Deppe, X. Dong, H.B. Dreis, V. Egorytchev, K. Ehret, F. Eisele, D. Emeliyanov, S. Erhan, S. Essenov, L. Fabbri, P. Faccioli, M. Feuerstack-Raible, J. Flammer, B. Fominykh, M. Funcke, Ll. Garrido, A. Gellrich, B. Giacobbe, J. Gläß, D. Goloubkov, Y. Golubkov, A. Golutvin, I. Golutvin, I. Gorbounov, A. Gorišek, O. Gouchtchine, D.C. Goulart, S. Gradl, W. Gradl, F. Grimaldi, Yu. Guilitsky, J.D. Hansen, J.M. Hernández, W. Hofmann, M. Hohlmann, T. Hott, W. Hulsbergen, U. Husemann, O. Igonkina, M. Ispiryan, T. Jagla, C. Jiang, H. Kapitza, S. Karabekyan, N. Karpenko, S. Keller, J. Kessler, F. Khasanov, Yu. Kiryushin, I. Kisel, E. Klinkby, K.T. Knöpfle, H. Kolanoski, S. Korpar, C. Krauss, P. Kreuzer, P. Križan, D. Krücker, S. Kupper, T. Kvaratskheliia, A. Lanyov, K. Lau, B. Lewendel, T. Lohse, B. Lomonosov, R. Männer, R. Mankel, S. Masciocchi, I. Massa, I. Matchikhilian, G. Medin, M. Medinnis, M. Mevius, A. Michetti, Yu. Mikhailov, R. Mizuk, R. Muresan, M. zur Nedden, M. Negodaev, M. Nörenberg, S. Nowak, M.T. Núñez Pardo de Vera, M. Ouchrif, F. Ould-Saada, C. Padilla, D. Peralta, R. Pernack, R. Pestotnik, B.AA. Petersen, M. Piccinini, M.A. Pleier, M. Poli, V. Popov, D. Pose, S. Prystupa, V. Pugatch, Y. Pylypchenko, J. Pyrlik, K. Reeves, D. Reßing, H. Rick, I. Riu, P. Robmann, I. Rostovtseva, V. Rybnikov, F. Sánchez, A. Sbrizzi, M. Schmelling, B. Schmidt, A. Schreiner, H. Schröder, U. Schwanke, A.J. Schwartz, A.S. Schwarz, B. Schwenninger, B. Schwingenheuer, F. Sciacca, N. Semprini-Cesari, S. Shuvalov, L. Silva, L. Sözüer, S. Solunin, A. Somov, S. Somov, J. Spengler, R. Spighi, A. Spiridonov, A. Stanovnik, M. Starič, C. Stegmann, H.S. Subramania, M. Symalla, I. Tikhomirov, M. Titov, I. Tsakov, U. Uwer, C. van Eldik, Yu. Vassiliev, M. Villa, A. Vitale, I. Vukotic, H. Wahlberg, A.H. Walenta, M. Walter, J.J. Wang, D. Wegener, U. Werthenbach, H. Wolters, R. Wurth, A. Wurz, Yu. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, and A. Zoccoli

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Polarization (waves), 01 natural sciences, Baryon, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, Transverse momentum, medicine, High Energy Physics::Experiment, Statistical error, Nuclear Experiment, 010306 general physics, Nucleus, HERA-B
Abstract

A measurement of the polarization of Λ and Λ ¯ baryons produced in pC and pW collisions at s = 41.6 GeV has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV / c p ⊥ 1.2 GeV / c in transverse momentum and − 0.15 x F 0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, + 0.054 ± 0.029 , is measured for x F ≲ − 0.07 . Zero polarization is expected at x F = 0 in the absence of nuclear effects. The polarization results for the Λ agree with a parametrization of previous measurements which were performed at positive x F values, where the Λ polarization is negative. Results of Λ ¯ polarization measurements are consistent with zero.

Published
2006
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5. Search for the flavor-changing neutral current decay D0→μ+μ− with the HERA-B detector

Author

A. Alexandrov, Laura Silva, Jian Wang, João Carvalho, H. Kapitza, S. Solunin, Sebastian Nowak, F. Sanchez, S. J. Aplin, B. Schwingenheuer, I. Massa, J. Pyrlik, S. Essenov, Maurizio Piccinini, A. Bertin, D. Wegener, Mikhail Danilov, N.N. Karpenko, L. Matchikhilian, A. Belkov, Mikhail Zavertyaev, Y. Goloubkov, R. Pernack, I. Abt, H. Wahlberg, W. Gradl, C. Cruse, P. Kreuzer, J. Bastos, S. De Castro, K. Smirnov, S. Karabekyan, B. Fominykh, S. Somov, J. Glaess, Yu.V. Mikhailov, R. Spighi, D. Goloubkov, Mauro Villa, M. T. Nunez Pardo de Vera, Dmitry Emeliyanov, T. Zivko, M. Ouchrif, H. B. Dreis, Samo Korpar, A. Wurz, M. Mevius, Ulrich Werthenbach, M. A. Pleier, O. Barsukova, V. Popov, Werner Hofmann, Rok Pestotnik, Robert Harr, R. Muresan, C. Bauer, H. Albrecht, M. zur Nedden, Peter Buchholz, L. Garrido, C. B. Krauss, I. Gorbounov, R. Wurth, D. Pose, A. H. Walenta, Mogens Dam, T. Zeuner, S. Kupper, A. J. Schwartz, D. Kruecker, A. Schreiner, C. Jiang, Kwong Lau, Y. Vassiliev, Y. Guilitsky, I. Belotelov, Wouter Hulsbergen, T. Kvaratskheliia, J. Flammer, A. Stanovnik, I. Tikhomirov, Valery Pugatch, Pietro Faccioli, A. Spiridonov, A. Michetti, M. Funcke, V. Aushev, K. M. Danielsen, H. S. Subramania, S. Nam, B. Schwenninger, Y. Bagaturia, Yu.T. Kiryushin, Y. Pylypchenko, M. Nörenberg, B. Lomonosov, L. Sozuer, J. Kessler, M. Feuerstack-Raible, M. Medinnis, B. Lewendel, Peter Robmann, Antonio Sbrizzi, O. Igonkina, M. Buchler, T. Jagla, X. Dong, Z. Zheng, J. Batista, S. Shuvalov, V. Rybnikov, U. Uwer, Imma Riu, Maksym Titov, C. van Eldik, H. Deppe, M. Bargiotti, A. Golutvin, Thomas Lohse, O. Rick, B. Bobchenko, D. Peralta, J. Shiu, M. Schmelling, I. Vukotic, C. Stegmann, H. Schröder, S. Masciocchi, A. Vitale, Bernhard Schmidt, M. Bruinsma, A. S. Schwarz, P. Krizan, Nicola Semprini-Cesari, M. Symalla, M. Ispiryan, O. Gouchtchine, Th. S. Bauer, Kendall Reeves, G. Bohm, M. Böcker, A. Pose, T. Hott, Laura Fabbri, Marco Bruschi, P. Conde, Igor Golutvin, S. Gradl, C. Padilla, R. Mizuk, Hermann Kolanoski, D. C. Goulart, G. Medin, Farid Ould-Saada, Antonio Zoccoli, Yu. Zaitsev, Vladislav Balagura, Vasco Amaral, I. Tsakov, K. Ehret, F. Eisele, M. Starič, A. Somov, M. Poli, Jose M Hernandez, A. Bogatyrev, D. Ressing, T. Buran, B. Giacobbe, A. Gorisek, S. Prystupa, F. Grimaldi, M. Adams, M. Negodaev, J.D. Hansen, A. Zhelezov, K. T. Knöpfle, V. Egorytchev, M. Bräuer, M. Walter, F. Khasanov, António Amorim, S. Keller, J. Spengler, R. Maenner, A. Lanyov, H. Wolters, F. Sciacca, U. Husemann, and R. Zimmermann

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Neutral current, 010308 nuclear & particles physics, Branching fraction, Flavor-changing neutral current, 0103 physical sciences, Detector, 010306 general physics, 01 natural sciences, HERA-B
Abstract

We report on a search for the flavor-changing neutral current decay D 0 → μ + μ − using 50 × 10 6 events recorded with a dimuon trigger in interactions of 920 GeV protons with nuclei by the HERA-B experiment. We find no evidence for such decays and set a 90% confidence level upper limit on the branching fraction B ( D 0 → μ + μ − ) 2.0 × 10 − 6 .

Published
2004
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6. Inclusive V production cross sections from 920 GeV fixed target proton-nucleus collisions

Author

Imma Riu, F. Sanchez, Hernan Wahlberg, L. Garrido, B. Bobchenko, N. Tesch, Brian Petersen, I. Kisel, C. Stegmann, C. B. Krauss, Mikhail Zavertyaev, O. Barsukova, J. L. Rosen, O. Steinkamp, Ulrich Werthenbach, D. Ryzhikov, F. Klefenz, D. Dujmic, I. Belotelov, H. Kapitza, H. Thurn, Yu. Pavlenko, P. Kreuzer, Jenny Ivarsson, Pietro Faccioli, M. Beck, I. Golutvin, V. Aushev, R. Wurth, T. Perschke, Mauro Villa, D. Broemmelsiek, M. Chmeissani, H. Sun, J. Yang, A. Michetti, Paul Edmund Karchin, A. Stanovnik, H. Fleckenstein, M. Ouchrif, S. Korpar, J. Luidemann, M. Spahn, K. Hofner, A. Kaoukher, Helmut Wolters, V. Saveliev, L. Sozuer, V. Vagnoni, J. Chamanina, A. Bogatyrev, Farid Ould-Saada, Kwong Lau, B. Lewende, M. Mevius, Yu.V. Mikhailov, L. Seybold, Ramon Miquel, J. D. Hansen, Søren Schmidt, Peter Robmann, Wolfgang Wagner, R. van Staa, R Stdenis, S. Hausmann, R. Chistov, D. Samtleben, B. Lomonosov, K. Berkhan, V. Rusinov, V. Eiges, M. Medinnis, D. C. Goulart, Dmitry Emeliyanov, S. Schaller, Z. Ke, I. Belyaev, A. Zhelezov, Samim Erhan, W. Ruckstuhl, A. Moshkin, V. Popov, Werner Hofmann, P.E. Schlein, J. Glass, R. F. Schwitters, Valery Pugatch, S. Essenov, J.J. Wang, D. Wegener, J. Rieling, Roberto Spighi, R. Mankel, A. Lange, D. Krücker, S. Nowak, D. Pose, J. Bastos, A. Belkov, Hyun-Chul Kim, N.N. Karpenko, W. Schmidt-Parzefall, Umberto Marini Bettolo Marconi, S. Steinbeck, V. Souvorov, A. Schreiner, Thomas Hamacher, B. Dolgoshein, W. Gradl, M. A. Pleier, C. Borgmeier, A. S. Schwarz, K. T. Knöpfle, B. Schwenninger, K. E. K. Gerndt, Antonio Zoccoli, Y. Guilitsky, Y. Vassiliev, U. Straumann, Yu.T. Kiryushin, I. Gorbounov, F. Saadi-Ludemannm, M. Dressel, M. Poli, D. Peralta, T. Lohse, I. Negri, M. Capeans, A. Bertin, Antonio Sbrizzi, Z. Zheng, S. Karabekyan, Y. Bagaturia, S. Ramachandran, G. Leffers, A. Vitale, I. Vukotic, S. Semenov, J. Zweizig, K. M. Danielsen, Benedetto Giacobbe, A. Gellrich, X. Dong, S. Shuvalov, Reinhard Männer, B. Schwingenheuer, B. Fominykh, F. Khasanov, M. Nörenberg, V. Rybnikov, M. Funcke, M. Walter, Nicola Semprini-Cesari, M. Bruinsma, M. Bargiotti, P. Pakhlov, C. van Eldik, H. Deppe, David Gascon, M. Hildebrandt, Kendall Reeves, I. C. Legrand, Vasco Amaral, S. Fourletov, M. Rietz, J. Shiu, O. Gouchtchine, J. Pyrlik, S. Solunin, W. Fallot-Burghardt, S. Keller, S. F. Takach, Christian Bauer, T. Glebe, Andrej Gorišek, D. Galli, H. Schröder, M. Ispiryan, M. Titov, G. Bohm, V. Bassetti, T. Fuljahn, Hermann Kolanoski, L. Matchikhilian, F Sciacca, Klaus Dehmelt, S. Gradl, R. Pernack, S. Issever, H. Itterbeck, V. Kochetkov, T. Zeuner, D. Skrk, I. Abt, B. X. Chen, M. Sang, P. Truöl, W. Hulsbergen, R. Baghshetsyan, P. J. Weyers, R. Wanke, J. Spengler, B. Schmidt, K. Ehret, Yuriy Pylypchenko, R. Pestotnik, Y. Jia, T. Buran, R. Loke, F. Sun, Ulrich Husemann, J. Flammer, M. Böcker, A. Pose, C. Jiang, A. Spiridonov, A. Christensen, M. Symalla, R. Eckmann, A. Golutvin, S. J. Aplin, João Carvalho, U. Trunk, M. S. Atiya, I. Tsakov, S. Nam, Olga Igonkina, V. Balagura, R. Muresan, M. Feuerstack-Raible, Y. Wang, C. Hast, G. Zech, A. Mohapatra, H. B. Dreis, M. Buchler, Mogens Dam, I. Arino, R. Mizuk, U. Schwanke, Laura Fabbri, S. De Castro, M. Danilov, P. Krizan, S. Masciocchi, A. H. Walenta, D. Goloubkov, K. Riechmann, B. Moshous, A. Lanyov, G. Medin, Z. Zhu, H. Deckers, A. Soldatov, T. Zivko, Marcus Hohlmann, A. Arefiev, F. Ratnikov, I. Tikhomirov, H. Albrecht, R. Zimmermann, I. Massa, A. Garcia, R. F. Harr, M. T. N. P. de Vera, T. Oest, D. Ressing, V. Egorytchev, A. Oliveira, A. Wurz, M. Bräuer, C. Rothe, H. D. Schultz, António Amorim, Peter Buchholz, T. Kvaratskheliia, Th.S. Bauer, T. Walter, M. Starič, A. Somov, M. Adams, E. Sexauer, M. Negodaev, Yang Liu, A. J. Schwartz, D. Stieler, Jose M Hernandez, M. Bruschi, M. Piccinini, A. Hoscher, G.J. Wagner, I. Siccama, M. Schmelling, S. Barsuk, S. Spratte, F. Eisele, M. Capponi, T. Hott, P. Conde, T. Jagla, S. Somov, Yu. Zaitsev, C. Cruse, C. Padilla, S. Xella-Hansen, A. Abyzov, and U. Uwer

Subjects
Physics, Physics and Astronomy (miscellaneous), Proton, 010308 nuclear & particles physics, Sigma, HERA, Lambda, 7. Clean energy, 01 natural sciences, Atomic mass, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon, 010303 astronomy & astrophysics, Engineering (miscellaneous), HERA-B, Bar (unit)
Abstract

Inclusive differential cross sections dsigma(pA)/dx(F) and dsigma(pA)/dp(t)(2) for the production of K-S(0), Lambda, and (U) over bar particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to roots = 41.6 GeV in the proton-nucleon system. The ratios of differential cross sections dsigma(pA)(K-S(0))/dsigma(pA)(Lambda) and dsigma(pA)((U) over bar)/dsigma(pA) (Lambda) are measured to be 6.2 +/- 0.5 and 0.66 +/- 0.07, respectively, for x(F) approximate to -0.06. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions da,Ald t also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections sigma(pA) on the atomic mass A of the target material is discussed, and the deduced cross sections per nucleon sigma(pN) are compared with results obtained at other energies.

Published
2003
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7. J/psi production via chi(c) decays in 920 GeV pA interactions

Author

Samim Erhan, P. Kreuzer, M. Noerenberg, M. T. Nunez Pardo de Vera, R. Muresan, B. Schmidt, L. Garrido, H. B. Dreis, K. Berkhan, T. Hott, A. Stanovnik, U. Uwer, Sebastian Nowak, V. Rusinov, D. Wegener, R. Mizuk, C. Borgmeier, W. Gradl, M. Walter, D. Ryzhikov, Peter Robmann, M. Hildebrandt, S. Schmidt, B. A. Petersen, V. Saveliev, O. Gouchtchine, R. vanStaa, K. Riechmann, J. Yang, Pietro Faccioli, I. Massa, V. Aushev, J.D. Hansen, M. Spahn, C. Cruse, H. Wahlberg, D. Dujmic, J. Glaess, G. Bohm, C. Hast, Hermann Kolanoski, M. Dressel, A. Somov, G. Medin, J. Chamanina, J. Zweizig, P.E. Schlein, K. M. Danielsen, R. F. Schwitters, R. Eckmann, P. Conde, D. Kruecker, Igor Golutvin, M. Boecker, T. Jagla, S. Schaller, A. Moshkin, R. Wanke, A. Zhelezov, Yu. Zaitsev, Y. Pylypchenko, O. Steinkamp, T. Zivko, L. Sozuer, F. Sanchez, Jenny Ivarsson, M. Capponi, D. Goloubkov, K. T. Knöpfle, Kwong Lau, A. Gellrich, W. Schmidt-Parzefall, R. Spighi, Thomas Hamacher, Y. Vassiliev, I. Negri, G. Leffers, Rok Pestotnik, M. Symalla, S. J. Aplin, H. Schroeder, S. Essenov, A. Michetti, Paul Edmund Karchin, Y. Guilitsky, S. Steinbeck, S. Solunin, W. Fallot-Burghardt, U. Werthenbach, Yu.V. Mikhailov, A. Kaoukher, G.J. Wagner, B. Lewendel, David Gascon, S. F. Takach, M. Titov, T. Zeuner, A. H. Walenta, Y. Wang, J. Spengler, A. Belkov, L. Matchikhilian, O. Barsukova, S. Karabekyan, R Stdenis, U. Trunk, A. J. Schwartz, D. Stieler, Jose M Hernandez, I. Siccama, I. Abt, H. Itterbeck, Ramon Miquel, R. Baghshetsyan, D. C. Goulart, D. Galli, V. Popov, Werner Hofmann, Imma Riu, Mikhail Zavertyaev, B. Dolgoshein, V. Kochetkov, Ch. Rothe, B. Schwenninger, B. Giacobbe, S. Shuvalov, B. Bobchenko, M. Capeans, Yu. Pavlenko, Hyun-Chul Kim, A. Arefiev, S. De Castro, A. Wurz, Yu.T. Kiryushin, Laura Fabbri, L. Seybold, A. Lanyov, F. Klefenz, B. Lomonosov, V. Eiges, M. Feuerstack-Raible, C. Jiang, A. Spiridonov, V. Rybnikov, A. Golutvin, C. Padilla, W. Ruckstuhl, F. Ratnikov, I. Tikhomirov, S. Nam, Nicola Semprini-Cesari, Mauro Villa, M. Schmelling, M. A. Pleier, K. Höpfner, A. Christensen, Y. Bagaturia, Christian Bauer, D. Peralta, V. Bassetti, R. Wurth, B. Moshous, U. Schwanke, P. Truöl, C. B. Krauss, T. Oest, S. Barsuk, Samo Korpar, M. Poli, M. Adams, N. Tesch, U. Marconi, Fouzia Saadi-Lüdemann, Antonio Zoccoli, Jian Wang, M. Chmeissani, João Carvalho, Antonio Sbrizzi, J. Lüdemann, S. Spratte, E. Sexauer, D. Ressing, F. Khasanov, Robert Harr, S. Hausmann, I. Vukotic, S. Xella-Hansen, A. Bogatyrev, M. Bruinsma, U. Husemann, M. Negodaev, Kendall Reeves, T. Glebe, S. Fourletov, V. Souvorov, J. Bastos, T. Buran, I. Kisel, M. Buchler, I. Belyaev, Maurizio Piccinini, Y. Goloubkov, A. Gorisek, Dmitry Emeliyanov, T. Perschke, I. Tsakov, S. Gradl, A. Schreiner, S. Ramachandran, S. Keller, Vasco Amaral, X. Chen, F Sciacca, Klaus Dehmelt, Mogens Dam, X. Dong, R. Pernack, S. Issever, M. Sang, A. S. Schwarz, Th. S. Bauer, J. L. Rosen, A. Bertin, K. Ehret, N.N. Karpenko, D. Broemmelsiek, P. J. Weyers, R. Loke, K. E. K. Gerndt, Yunpeng Liu, Peter Buchholz, B. Schwingenheuer, A. Pose, W. Hulsbergen, Y. Jia, Z. Zheng, Marco Bruschi, A. Holscher, T. Walter, Thomas Lohse, J. Pyrlik, F. Eisele, A. Soldatov, Marcus Hohlmann, S. Somov, M. Ispiryan, J. Flammer, M. Bargiotti, B. Fominykh, Helmut Wolters, Farid Ould-Saada, M. Ouchrif, I. Arino, Wolfgang Wagner, M. Beck, Olga Igonkina, R. Zimmermann, P. Krizan, V. Balagura, H. Deckers, M. Danilov, I. Gorbounov, G. Zech, A. Mohapatra, T. Kvaratskheliia, R. Mankel, M. Funcke, I. C. Legrand, H. Albrecht, M. Starič, D. Skrk, V. Egorytchev, A. Oliveira, A. Lange, D. Pose, M. Braeuer, Mike Medinnis, C. van Eldik, Z. Ke, H. Deppe, J. Rieling, H. D. Schultz, Vincenzo Vagnoni, M. Rietz, C. Stegmann, A. Vitale, S. Semenov, António Amorim, T. Fuljahn, A. Garcia, R. Maenner, M. Mevius, H. Fleckenstein, R. Chistov, D. Samtleben, I. Belotelov, H. Kapitza, H. Thurn, Valery Pugatch, M. S. Atiya, S. Masciocchi, Z. Zhu, Geometry, (Astro)-Particles Physics, Mathematical Analysis, and Business Web and Media

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, HERA-B
Abstract

Using data collected by the HERA-B experiment, we have measured the fraction of J\psi's produced via radiative chi_c decays in interactions of 920 GeV protons with carbon and titanium targets. We obtained R_{\chi_c} = 0.32 \pm 0.06_{stat} \pm 0.04_{sys} for the fraction of J\psi from chi_c decays averaged over proton-carbon and proton-titanium collisions. This result is in agreement with previous measurements and is compared with theoretical predictions., Comment: 16 pages, 5 figs

Published
2003
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8. Measurement of the $b\overline{b}$ production cross section in 920 GeV fixed-target proton-nucleus collisions

Author

R. Spighi, Dmitry Emeliyanov, H. Fleckenstein, Jian Wang, R. van Staa, S. Hausmann, Y. Pylypchenko, T. Glebe, Antonio Zoccoli, R. Chistov, D. Samtleben, I. Siccama, Imma Riu, C. B. Krauss, B. Bobchenko, A. Hoscher, T. Zeuner, I. C. Legrand, W. Hulsbergen, Y. Jia, Z. Zheng, J. Flammer, R. Baghshetsyan, A. Bogatyrev, D. Broemmelsiek, Olga Igonkina, K. E. K. Gerndt, D. Skrk, Y. Vassiliev, M. Hildebrandt, V. Balagura, J. Bastos, G. Zech, A. Mohapatra, A. Belkov, Valery Pugatch, M. Bräuer, G.J. Wagner, H. Kapitza, M. A. Pleier, S. Gradl, A. Schreiner, Maurizio Piccinini, H. Thurn, Sebastian Nowak, V. Rusinov, Th. S. Bauer, B. X. Chen, R. Mizuk, V. Souvorov, T. Buran, D. Wegener, W. Gradl, S. Essenov, L. Seybold, Søren Schmidt, K. Riechmann, R. Pernack, S. Issever, S. Karabekyan, J. Rosen, Z. Ke, B. Lomonosov, J. Rieling, V. Eiges, H. Albrecht, Vincenzo Vagnoni, P. J. Weyers, R. Loke, S. Somov, M. Ouchrif, H. Wahlberg, M. Böcker, A. Pose, I. Belyaev, A. Lange, K. M. Danielsen, Jenny Ivarsson, M. Capponi, M. Atiya, V. Amaral, I. Massa, A. Abyzov, T. Oest, G. Medin, D. Galli, F. Eisele, Hyun-Chul Kim, Samim Erhan, T. Zivko, U. Marconi, S. Masciocchi, D. Pose, M. Symalla, S. J. Aplin, F. Sanchez, C. van Eldik, Marco Bruschi, H. Sun, A. Michetti, Paul Edmund Karchin, H. Deppe, A. Kaoukher, W. Ruckstuhl, D. Peralta, Z. Zhu, B. Moshous, Peter Robmann, S. De Castro, I. Vukotic, V. Egorytchev, A. Oliveira, M. Rietz, A. Arefiev, P. Kreuzer, J. Shiu, S. Xella-Hansen, David Gascon, U. Schwanke, Ramon Miquel, C. Rothe, H. D. Schultz, H. B. Dreis, K. Berkhan, T. Hott, Peter E. Schlein, J. Luidemann, Y. Wang, C. Stegmann, A. Vitale, Andrej Gorišek, A. Bertin, M. Walter, S. Semenov, C. Borgmeier, M. Poli, Helmut Wolters, Farid Ould-Saada, T. Fuljahn, L. Garrido, F. Ratnikov, I. Tikhomirov, C. Jiang, O. Barsukova, A. Spiridonov, A. Stanovnik, O. Gouchtchine, S. Shuvalov, F. Klefenz, Ulrich Werthenbach, D. Ryzhikov, Wolfgang Wagner, A. Christensen, Mike Medinnis, O. Steinkamp, S. Steinbeck, J. Glass, R. F. Schwitters, R. Pestotnik, M. T. N. P. de Vera, Robert Harr, V. Saveliev, G. Bohm, M. Spahn, Hermann Kolanoski, B. Schwingenheuer, Nicola Semprini-Cesari, M. Schmelling, Pietro Faccioli, V. Aushev, Y. Guilitsky, B. Dolgoshein, M. Capeans, J. Yang, R. Wanke, F. Sun, M. Mevius, Christian Bauer, Laura Fabbri, F. Saadi-Ludemannm, Thomas Hamacher, Antonio Sbrizzi, C. Padilla, U. Uwer, I. Belotelov, M. Nörenberg, T. Perschke, H. Schröder, A. Wurz, J. Zweizig, S. F. Takach, J. Chamanina, M. Titov, J. D. Hansen, X. Dong, B. A. A. Petersen, Mogens Dam, L. Sozuer, K. Hofner, P. Krizan, D. Goloubkov, Y. Bagaturia, I. Negri, G. Leffers, S. Barsuk, M. Beck, M. Bargiotti, B. Fominykh, S. Solunin, A. Soldatov, F Sciacca, Marcus Hohlmann, Klaus Dehmelt, W. Schmidt-Parzefall, W. Fallot-Burghardt, M. Ispiryan, D. Dujmic, I. Tsakov, L. Matchikhilian, S. Spratte, D. Ressing, R. Zimmermann, H. Itterbeck, V. Kochetkov, R. Eckmann, P. Conde, Igor Golutvin, T. Jagla, A. Garcia, N. N. Karpenko, A. Amorim, A. Moshkin, T. Walter, Ulrich Husemann, I. Arino, João Carvalho, Yu. Zaitsev, D. Krucker, H. Deckers, M. Danilov, C. Cruse, R Stdenis, M. Dressel, Peter Buchholz, A. H. Walenta, I. Gorbounov, R. Mankel, Kwong Lau, A. Gellrich, M. Funcke, T. Kvaratskheliia, R. Wurth, M. Chmeissani, B. Lewende, S. Ramachandran, A. S. Schwarz, R. Manner, A. J. Schwartz, A. Golutvin, S. Nam, M. Bruinsma, P. Pakhlov, Kendall Reeves, M. Sang, K. Ehret, I. Kisel, M. Buchler, F. Khasanov, Thomas Lohse, S. Fourletov, S. Keller, I. Abt, J. Spengler, U. Trunk, A. Lanyov, A. Zhelezov, K. T. Knöpfle, Yang Liu, U. Straumann, D. Stieler, Jose M Hernandez, B. Giacobbe, M. Adams, N. Tesch, E. Sexauer, Yu.V. Mikhailov, M. Negodaev, Mikhail Zavertyaev, D. C. Goulart, M. Starič, A. Somov, Yu. Pavlenko, S. Schaller, V. Popov, Werner Hofmann, J. Pyrlik, B. Schwenninger, Mauro Villa, Samo Korpar, Yu.T. Kiryushin, M. Feuerstack-Raible, V. Rybnikov, V. Bassetti, P. Truöl, B. Schmidt, R. Muresan, C. Hast, Geometry, (Astro)-Particles Physics, Mathematical Analysis, and Business Web and Media

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Proton, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Sigma, HERA, 01 natural sciences, Bottom quark, High Energy Physics - Experiment, Nuclear physics, Cross section (physics), 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), HERA-B, Bar (unit)
Abstract

Using the HERA-B detector, the b-bbar production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b-bbar production was tagged via inclusive bottom quark decays into J/psi, by exploiting the longitudinal separation of J/psi->ll decay vertices from the primary proton-nucleus interaction. Both $e^+e^-$ and $\mu^+\mu^-$ channels have been reconstructed and the combined analysis yields the cross section $\sigma(b \bar b) = 32 ^{+14}_{-12} (stat) ^{+6}_{-7} (sys) nb/nucleon$., Comment: 22 pages, 10 Postscript figures

Published
2003
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9. Kinematic distributions and nuclear effects of J/psi production in 920-GeV fixed-target proton-nucleus collisions

Author

Y. Vassiliev, A. Bogatyrev, R. Muresan, C. Stegmann, F. Sanchez, S. Karabekyan, C. B. Krauss, A. Belkov, U. Schwanke, T. Buran, Mikhail Zavertyaev, Marco Bruschi, I. Belotelov, H. Kapitza, A. Vitale, D. Reßing, Peter Robmann, Nicola Semprini-Cesari, A. Stanovnik, I. Tikhomirov, C. van Eldik, M. Ispiryan, H. S. Subramania, A. J. Schwartz, Jose M Hernandez, T. Hott, Dmitry Emeliyanov, S. Solunin, P. Conde, J.D. Hansen, Mauro Villa, B. Giacobbe, S. Gradl, I. Matchikhilian, I. Abt, S. Prystupa, M. Nörenberg, A. S. Schwarz, B. Schwenninger, Samo Korpar, Igor Golutvin, H. B. Dreis, Yu.T. Kiryushin, Vladimir Popov, Laura Silva, Maurizio Piccinini, R. Pernack, C. Jiang, Vladislav Balagura, V. Rybnikov, S. De Castro, Z. Zheng, Yu. Zaitsev, S. Shuvalov, M. zur Nedden, M. Schmelling, M. Adams, H. Deppe, F. Eisele, I. Rostovtseva, A. Schreiner, Kwong Lau, Pietro Faccioli, V. Aushev, J. Flammer, O. Barsukova, H. Schröder, Andrej Gorišek, S. Kupper, Wouter Hulsbergen, M. Negodaev, U. Uwer, C. Cruse, F. Grimaldi, M. Poli, M. Danilov, C. Bauer, I. Tsakov, P. Kreuzer, O. Igonkina, M. Symalla, K. T. Knöpfle, I. Gorbounov, B. Fominykh, M. A. Pleier, M. T. Nunez Pardo de Vera, M. Agari, Valery Pugatch, Yu.V. Mikhailov, R. Pestotnik, Thomas Lohse, Laura Fabbri, J. Groth-Jensen, M. Starič, M. Funcke, A. Somov, A. Zhelezov, C. Padilla, M. Bargiotti, Y. Guilitsky, D. C. Goulart, Werner Hofmann, S. Somov, Y. Pylypchenko, Aleksandar Aleksandrov, Sebastian Nowak, D. Wegener, D. Goloubkov, Ulrich Werthenbach, M. Bruinsma, Kendall Reeves, K. M. Danielsen, M. Ouchrif, Reinhard Männer, N.N. Karpenko, K. Ehret, H. Wahlberg, W. Gradl, J. Kessler, Antonio Sbrizzi, J. Gläß, Imma Riu, T. Jagla, X. Dong, P. Križan, A. Golutvin, B. Bobchenko, J. Spengler, I. Kisel, A. Michetti, L. Sozuer, H. Albrecht, B. Lewendel, R. Mankel, R. Wurth, D. Pose, V. Egorytchev, Maksym Titov, M. Mevius, A. Lanyov, A. Gellrich, F. Sciacca, O. Gouchtchine, G. Bohm, Hermann Kolanoski, S. Masciocchi, T. Živko, S. Essenov, S. Keller, D. Krücker, R. Mizuk, Yu. A. Golubkov, A. Bertin, Alexander Spiridonov, S. Xella-Hansen, João Carvalho, B. Schmidt, Peter Buchholz, Y. Bagaturia, S. J. Aplin, Ll. Garrido, B. Schwingenheuer, T. Kvaratskheliia, I. Massa, J. Pyrlik, A. Wurz, Marcus Hohlmann, U. Husemann, R. Zimmermann, J. Batista, J. J. Wang, M. Bräuer, M. Walter, António Amorim, D. Peralta, I. Vukotic, F. Khasanov, H. Rick, R. Spighi, T. Zeuner, E. B. Klinkby, G. Medin, J. Bastos, M. Feuerstack-Raible, Mogens Dam, B. Aa. Petersen, B. Lomonosov, M. Medinnis, Helmut Wolters, A. H. Walenta, Farid Ould-Saada, Antonio Zoccoli, Vasco Amaral, Th. S. Bauer, M. Böcker, PRT, ESP, UKR, CHN, DEU, NOR, USA, FRA, SVN, CHE, DNK, RUS, NLD, DIP. DI FISICA, DIPARTIMENTO DI FISICA E ASTRONOMIA 'AUGUSTO RIGHI', Facolta' di INGEGNERIA, SECONDA FACOLTA' DI INGEGNERIA DELL'UNIVERSITA' DI BOLOGNA CON SEDE CESENA, I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, A. AMORIM, S.J. APLIN, V. AUSHEV, Y. BAGATURIA, V. BALAGURA, M. BARGIOTTI, O. BARSUKOVA, J. BASTOS, J. BATISTA, C. BAUER, TH.S. BAUER, A. BELKOV, AR. BELKOV, I. BELOTELOV, A. BERTIN, B. BOBCHENKO, M. BOCKER, A. BOGATYREV, G. BOHM, M. BRAUER, M. BRUINSMA, M. BRUSCHI, P. BUCHHOLZ, T. BURAN, J. CARVALHO, P. CONDE, C. CRUSE, M. DAM, K.M. DANIELSEN, M. DANILOV, S. DE CASTRO, H. DEPPE, X. DONG, H.B. DREIS, V. EGORYTCHEV, K. EHRET, F. EISELE, D. EMELIYANOV, S. ERHAN, S. ESSENOV, L. FABBRI, P. FACCIOLI, M. FEUERSTACK-RAIBLE, J. FLAMMER, B. FOMINYKH, M. FUNCKE, LL. GARRIDO, A. GELLRICH, B. GIACOBBE, J. GLA, D. GOLOUBKOV, Y. GOLUBKOV, A. GOLUTVIN, I. GOLUTVIN, I. GORBOUNOV, A. GORISEK, O. GOUCHTCHINE, D.C. GOULART, S. GRADL, W. GRADL, F. GRIMALDI, YU. GUILITSKY, J.D. HANSEN, J.M. HERNANDEZ, W. HOFMANN, M. HOHLMANN, T. HOTT, W. HULSBERGEN, U. HUSEMANN, O. IGONKINA, M. ISPIRYAN, T. JAGLA, C. JIANG, H. KAPITZA, S. KARABEKYAN, N. KARPENKO, S. KELLER, J. KESSLER, F. KHASANOV, YU. KIRYUSHIN, I. KISEL, E. KLINKBY, K.T. KNOPFLE, H. KOLANOSKI, S. KORPAR, C. KRAUSS, P. KREUZER, P. KRIZAN, D. KRUCKER, S. KUPPER, T. KVARATSKHELIIA, A. LANYOV, K. LAU, B. LEWENDEL, T. LOHSE, B. LOMONOSOV, R. MANNER, R. MANKEL, S. MASCIOCCHI, I. MASSA, I. MATCHIKHILIAN, G. MEDIN, M. MEDINNIS, M. MEVIUS, A. MICHETTI, YU. MIKHAILOV, R. MIZUK, R. MURESAN, M.ZUR NEDDEN, M. NEGODAEV, M. NORENBERG, S. NOWAK, M.T. NUNEZ PARDO DE VERA, M. OUCHRIF, F. OULD-SAADA, C. PADILLA, D. PERALTA, R. PERNACK, R. PESTOTNIK, B.A. PETERSEN, M. PICCININI, M.A. PLEIER, M. POLI, V. POPOV, D. POSE, S. PRYSTUPA, V.M. PUGATCH, Y. PYLYPCHENKO, J. PYRLIK, K. REEVES, D. REING, H. RICK, I. RIU, P. ROBMANN, I. ROSTOVTSEVA, V. RYBNIKOV, F. SANCHEZ, A. SBRIZZI, M. SCHMELLING, B. SCHMIDT, A. SCHREINER, H. SCHRODER, U. SCHWANKE, ALAN J. SCHWARTZ, ANDREAS S. SCHWARZ, B. SCHWENNINGER, B. SCHWINGENHEUER, F. SCIACCA, N. SEMPRINI-CESARI, S. SHUVALOV, L. SILVA, L. SOZUER, S. SOLUNIN, A. SOMOV, S. SOMOV, J. SPENGLER, R. SPIGHI, A. SPIRIDONOV, A. STANOVNIK, M. STARI&#711, C, C. STEGMANN, H. S. SUBRAMANIA, M. SYMALLA, I. TIKHOMIROV, M. TITOV, I. TSAKOV, U. UWER, C. VAN ELDIK, YU. VASSILIEV, M. VILLA, A. VITALE, I. VUKOTIC, H. WAHLBERG, A. H. WALENTA,M. WALTER, J. J. WANG, D. WEGENER, U. WERTHENBACH, H. WOLTERS, R. WURTH, A. WURZ, S. XELLA-HANSEN, YU. ZAITSEV, M. ZAVERTYAEV, T. ZEUNER, A. ZHELEZOV, Z. ZHENG, R. ZIMMERMANN, T. &#711, and ZIVKO, A. ZOCCOLI

Subjects
Physics, Particle physics, Meson, Proton, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, DESY, HERA, 01 natural sciences, F region, High Energy Physics - Experiment, Nuclear physics, symbols.namesake, 0103 physical sciences, symbols, Feynman diagram, Production (computer science), High Energy Physics::Experiment, ddc:530, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), HERA-B
Abstract

Measurements of the kinematic distributions of $J/\psi$ mesons produced in $p-$C, $p-$Ti and $p-$W collisions at $\sqrt{s}=41.6 \mathrm{GeV}$ in the Feynman-$x$ region $-0.34 < x_{F} < 0.14$ and for transverse momentum up to $p_T = 5.4 \mathrm{GeV}/c$ are presented. The $x_F$ and $p_T$ dependencies of the nuclear suppression parameter, $\alpha$, are also given. The results are based on $2.4 \cdot 10^{5}$ $J/\psi$ mesons in both the $e^+ e^-$ and $\mu^{+}\mu^{-}$ decay channels. The data have been collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The measurement explores the negative region of $x_{F}$ for the first time. The average value of $\alpha$ in the measured $x_{F}$ region is $0.981 \pm 0.015$. The data suggest that the strong nuclear suppression of $J/\psi$ production previously observed at high $x_F$ turns into an enhancement at negative $x_F$., Comment: 19 pages, 11 figures, 6 tables

Published
2009
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10. Luminosity determination at HERA-B

Author

I. Matchikhilian, T. Hott, Laura Silva, P. Conde, Igor Golutvin, Yu. Zaitsev, Y. Guilitsky, K. T. Knöpfle, Y. Pylypchenko, M. Bruinsma, Kendall Reeves, Maurizio Piccinini, I. Massa, K. Ehret, R. Pernack, J. Kessler, Antonio Sbrizzi, C. Cruse, M. A. Pleier, L. Sozuer, J. Spengler, Marcus Hohlmann, T. Jagla, X. Dong, S. Solunin, Th. S. Bauer, U. Husemann, R. Zimmermann, Imma Riu, P. Križan, A. Golutvin, B. Bobchenko, A. Lanyov, M. Böcker, C. Stegmann, Antonio Zoccoli, I. Abt, Wouter Hulsbergen, F. Sciacca, I. Kisel, V. Rybnikov, Maksym Titov, A. Wurz, J. J. Wang, M. Poli, A. Vitale, N.N. Karpenko, F. Eisele, R. Muresan, S. Xella-Hansen, D. Reßing, A. J. Schwartz, A. Belkov, Jose M Hernandez, A. H. Walenta, Thomas Lohse, H. B. Dreis, Vladimir Popov, E. B. Klinkby, M. Bräuer, Valery Pugatch, A. Schreiner, M. Walter, O. Barsukova, T. Živko, B. Giacobbe, S. Essenov, S. Keller, J. Batista, M. Danilov, M. T. Nunez Pardo de Vera, M. Agari, C. Bauer, Peter Buchholz, H. Albrecht, Y. Bagaturia, S. Prystupa, A. Zhelezov, Ulrich Werthenbach, Vasco Amaral, R. Mankel, D. Goloubkov, M. zur Nedden, I. Gorbounov, Kwong Lau, R. Wurth, D. Pose, Ll. Garrido, S. De Castro, T. Kvaratskheliia, A. Bogatyrev, O. Igonkina, B. Aa. Petersen, C. B. Krauss, António Amorim, D. Peralta, U. Uwer, H. Deppe, T. Buran, I. Rostovtseva, M. Nörenberg, M. Funcke, F. Sanchez, I. Vukotic, I. Belotelov, I. Tikhomirov, Andrej Gorišek, R. Mizuk, U. Schwanke, H. Rick, B. Schwenninger, M. Starič, A. Stanovnik, A. Somov, Helmut Wolters, Yu.T. Kiryushin, H. S. Subramania, Mikhail Zavertyaev, T. Zeuner, Farid Ould-Saada, S. Masciocchi, V. Egorytchev, J. Bastos, M. Feuerstack-Raible, A. S. Schwarz, Mogens Dam, R. Pestotnik, M. Adams, A. Michetti, S. Shuvalov, Mauro Villa, M. Mevius, Samo Korpar, M. Negodaev, B. Lewendel, B. Fominykh, Yu.V. Mikhailov, B. Lomonosov, M. Medinnis, D. C. Goulart, Werner Hofmann, A. Gellrich, Nicola Semprini-Cesari, O. Gouchtchine, G. Bohm, I. Tsakov, Hermann Kolanoski, S. Kupper, R. Spighi, P. Kreuzer, M. Symalla, B. Schmidt, K. M. Danielsen, Reinhard Männer, Marco Bruschi, Dmitry Emeliyanov, M. Ispiryan, S. Gradl, S. J. Aplin, F. Khasanov, Vladislav Balagura, Y. Vassiliev, J. Pyrlik, A. Bertin, C. Jiang, Z. Zheng, Alexander Spiridonov, Laura Fabbri, J. Groth-Jensen, S. Karabekyan, G. Medin, M. Bargiotti, C. Padilla, João Carvalho, Sebastian Nowak, B. Schwingenheuer, D. Wegener, H. Kapitza, C. van Eldik, H. Wahlberg, W. Gradl, D. Krücker, Yu. A. Golubkov, J. Gläß, Pietro Faccioli, V. Aushev, F. Grimaldi, S. Somov, Aleksandar Aleksandrov, M. Ouchrif, M. Schmelling, J. Flammer, H. Schröder, Peter Robmann, J.D. Hansen, I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, A. AMORIM, S.J. APLIN, V. AUSHEV, Y. BAGATURIA, V. BALAGURA, M. BARGIOTTI, O. BARSUKOVA, J. BASTOS, J. BATISTA, C. BAUER, TH.S. BAUER, A. BELKOV, AR. BELKOV, I. BELOTELOV, A. BERTIN, B. BOBCHENKO, M. BOCKER, A. BOGATYREV, G. BOHM, M. BRAUER, M. BRUINSMA, M. BRUSCHI, P. BUCHHOLZ, T. BURAN, J. CARVALHO, P. CONDE, C. CRUSE, M. DAM, K.M. DANIELSEN, M. DANILOV, S. DE CASTRO, H. DEPPE, X. DONG, H.B. DREIS, V. EGORYTCHEV, K. EHRET, F. EISELE, D. EMELIYANOV, S. ESSENOV, L. FABBRI, P. FACCIOLI, M. FEUERSTACK-RAIBLE, J. FLAMMER, B. FOMINYKH, M. FUNCKE, LL. GARRIDO, A. GELLRICH, B. GIACOBBE, J. GLASS, D. GOLOUBKOV, Y. GOLUBKOV, A. GOLUTVIN, I. GOLUTVIN, I. GORBOUNOV, A. GORISEK, O. GOUCHTCHINE, D.C. GOULART, S. GRADL, W. GRADL, F. GRIMALDI, J. GROTH-JENSEN, YU. GUILITSKY, J.D. HANSEN, J.M. HERNANDEZ, W. HOFMANN, M. HOHLMANN, T. HOTT, W. HULSBERGEN, U. HUSEMANN, O. IGONKINA, M. ISPIRYAN, T. JAGLA, C. JIANG, H. KAPITZA, S. KARABEKYAN, N. KARPENKO, S. KELLER, J. KESSLER, F. KHASANOV, YU. KIRYUSHIN, I. KISEL, E. KLINKBY, K.T. KNOPFLE, H. KOLANOSKI, S. KORPAR, C. KRAUSS, P. KREUZER, P. KRIZAN, D. KRUCKER, S. KUPPER, T. KVARATSKHELIIA, A. LANYOV, K. LAU, B. LEWENDEL, T. LOHSE, B. LOMONOSOV, R. MANNER, R. MANKEL, S. MASCIOCCHI, I. MASSA, I. MATCHIKHILIAN, G. MEDIN, M. MEDINNIS, M. MEVIUS, A. MICHETTI, YU. MIKHAILOV, R. MIZUK, R. MURESAN, M. ZUR NEDDEN, M. NEGODAEV, M. NORENBERG, S. NOWAK, M.T. NUNEZ PARDO DE VERA, M. OUCHRIF, F. OULD-SAADA, C. PADILLA, D. PERALTA, R. PERNACK, R. PESTOTNIK, B.AA. PETERSEN, M. PICCININI, M.A. PLEIER, M. POLI, V. POPOV, D. POSE, S. PRYSTUPA, V. PUGATCH, Y. PYLYPCHENKO, J. PYRLIK, K. REEVES, D. RESSING, H. RICK, I. RIU, P. ROBMANN, I. ROSTOVTSEVA, V. RYBNIKOV, F. SANCHEZ, A. SBRIZZI, M. SCHMELLING, B. SCHMIDT, A. SCHREINER, H. SCHRODER, U. SCHWANKE, A.J. SCHWARTZ, A.S. SCHWARZ, B. SCHWENNINGER, B. SCHWINGENHEUER, F. SCIACCA, N. SEMPRINI-CESARI, S. SHUVALOV, L. SILVA, L. SOZUER, S. SOLUNIN, A. SOMOV, S. SOMOV, J. SPENGLER, R. SPIGHI, A. SPIRIDONOV, A. STANOVNIK, M. STARIC, C. STEGMANN, H.S. SUBRAMANIA, M. SYMALLA, I. TIKHOMIROV, M. TITOV, I. TSAKOV, U. UWER, C. VAN ELDIK, YU. VASSILIEV, M. VILLA, A. VITALE, I. VUKOTIC, H. WAHLBERG, A.H. WALENTA, M. WALTER, J.J. WANG, D. WEGENER, U. WERTHENBACH, H. WOLTERS, R. WURTH, A. WURZ, S. XELLA-HANSEN, YU. ZAITSEV, M. ZAVERTYAEV, T. ZEUNER, A. ZHELEZOV, Z. ZHENG, R. ZIMMERMAN, T. ZIVKO, and A. ZOCCOLI

Subjects
Physics, Nuclear and High Energy Physics, Measurement method, Luminosity (scattering theory), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, HERA, 01 natural sciences, Measure (mathematics), Nuclear physics, Delta ray, Physics - Data Analysis, Statistics and Probability, 0103 physical sciences, ddc:530, High Energy Physics::Experiment, 010303 astronomy & astrophysics, Instrumentation, HERA-B
Abstract

A detailed description of an original method used to measure the luminosity accumulated by the HERA-B experiment for a data sample taken during the 2002-2003 HERA running period is reported. We show that, with this method, a total luminosity measurement can be achieved with a typical precision, including overall systematic uncertainties, at a level of 5% or better. We also report evidence for the detection of delta-rays generated in the target and comment on the possible use of such delta rays to measure luminosity., Comment: 24 pages, 5 figures

Published
2007
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11. A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions

Author

Pietro Faccioli, V. Aushev, F. Grimaldi, Y. Vassiliev, C. Jiang, A. Spiridonov, S. Karabekyan, C. van Eldik, M. Schmelling, M. Bargiotti, H. Schröder, Sebastian Nowak, D. Wegener, B. Aa. Petersen, H. Deppe, H. Wahlberg, W. Gradl, S. Somov, M. Ouchrif, Peter Robmann, S. Essenov, Helmut Wolters, F. Eisele, Farid Ould-Saada, M. Adams, I. Massa, N.N. Karpenko, Rok Pestotnik, O. Barsukova, Wouter Hulsbergen, R. Muresan, I. Rostovtseva, A. H. Walenta, M. Symalla, S. De Castro, S. Kupper, L. Sozuer, I. Kisel, R. Mizuk, H. Albrecht, R. Mankel, Laura Fabbri, J. Groth-Jensen, F. Khasanov, R. Wurth, D. Pose, O. Igonkina, C. Padilla, M. Negodaev, M. Poli, Y. Guilitsky, Antonio Zoccoli, T. Živko, I. Tikhomirov, A. Aleksandrov, K. Ehret, J. Kessler, Antonio Sbrizzi, B. Lomonosov, A. Michetti, Thomas Lohse, S. Keller, T. Jagla, A. Belkov, M. Medinnis, X. Dong, J. Gläß, B. Lewendel, Vasco Amaral, Valery Pugatch, Mikhail Danilov, Dmitry Emeliyanov, Maksym Titov, A. Schreiner, J.D. Hansen, M. Nörenberg, A. Wurz, A. Gellrich, A. Zhelezov, Y. Bagaturia, A. Bogatyrev, Nicola Semprini-Cesari, A. S. Schwarz, Mogens Dam, B. Fominykh, Yu.V. Mikhailov, O. Gouchtchine, E. B. Klinkby, A. J. Schwartz, Jose M Hernandez, C. B. Krauss, Z. Zheng, T. Buran, A. Gorisek, Bernhard Schmidt, K. T. Knöpfle, Laura Silva, Jian Wang, G. Bohm, D. C. Goulart, B. Giacobbe, I. Belotelov, Hermann Kolanoski, V. Popov, Werner Hofmann, B. Schwenninger, I. Tsakov, M. T. Nunez Pardo de Vera, M. Agari, Yu.T. Kiryushin, F. Sanchez, S. Prystupa, J. Spengler, H. S. Subramania, M. Feuerstack-Raible, G. Medin, Ulrich Werthenbach, I. Matchikhilian, Th. S. Bauer, S. Shuvalov, V. Rybnikov, U. Schwanke, Maurizio Piccinini, Mikhail Zavertyaev, R. Pernack, S. Solunin, D. Goloubkov, J. Bastos, A. Lanyov, M. Böcker, I. Abt, Marco Bruschi, F. Sciacca, C. Bauer, Peter Buchholz, Mauro Villa, H. B. Dreis, Samo Korpar, D. Reßing, I. Gorbounov, T. Kvaratskheliia, M. Funcke, M. Starič, A. Somov, Y. Pylypchenko, C. Stegmann, A. Vitale, Imma Riu, P. Križan, S. Masciocchi, A. Golutvin, B. Bobchenko, R. Spighi, S. J. Aplin, V. Egorytchev, B. Schwingenheuer, M. Bräuer, M. Walter, António Amorim, Marcus Hohlmann, U. Husemann, R. Zimmermann, J. Pyrlik, J. Batista, D. Peralta, João Carvalho, H. Kapitza, I. Vukotic, Yu. A. Golubkov, A. Bertin, H. Rick, P. Kreuzer, T. Zeuner, J. Flammer, K. M. Danielsen, M. Bruinsma, Kendall Reeves, M. Ispiryan, S. Gradl, Vladislav Balagura, D. Krucker, M. zur Nedden, Kwong Lau, R. Manner, U. Uwer, A. Stanovnik, M. Mevius, C. Cruse, M. A. Pleier, T. Hott, P. Conde, Igor Golutvin, Yu. Zaitsev, L. Garrido, I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, A. AMORIM, S.J. APLIN, V. AUSHEV, Y. BAGATURIA, V. BALAGURA, M. BARGIOTTI, O. BARSUKOVA, J. BASTOS, J. BATISTA, C. BAUER, TH.S. BAUER, A. BELKOV, AR. BELKOV, I. BELOTELOV, A. BERTIN, B. BOBCHENKO, M. BOCKER, A. BOGATYREV, G. BOHM, M. BRAUER, M. BRUINSMA, M. BRUSCHI, P. BUCHHOLZ, T. BURAN, J. CARVALHO, P. CONDE, C. CRUSE, M. DAM, K.M. DANIELSEN, M. DANILOV, S. DE CASTRO, H. DEPPE, X. DONG, H.B. DREIS, V. EGORYTCHEV, K. EHRET, F. EISELE, D. EMELIYANOV, S. ERHAN, S. ESSENOV, L. FABBRI, P. FACCIOLI, M. FEUERSTACK-RAIBLE, J. FLAMMER, B. FOMINYKH, M. FUNCKE, LL. GARRIDO, A. GELLRICH, B. GIACOBBE, J. GLA, D. GOLOUBKOV, Y. GOLUBKOV, A. GOLUTVIN, I. GOLUTVIN, I. GORBOUNOV, A. GORISEK, O. GOUCHTCHINE, D.C. GOULART, S. GRADL, W. GRADL, F. GRIMALDI, YU. GUILITSKY, J.D. HANSEN, J.M. HERNANDEZ, W. HOFMANN, M. HOHLMANN, T. HOTT, W. HULSBERGEN, U. HUSEMANN, O. IGONKINA, M. ISPIRYAN, T. JAGLA, C. JIANG, H. KAPITZA, S. KARABEKYAN, N. KARPENKO, S. KELLER, J. KESSLER, F. KHASANOV, YU. KIRYUSHIN, I. KISEL, E. KLINKBY, K.T. KNOPFLE, H. KOLANOSKI, S. KORPAR, C. KRAUSS, P. KREUZER, P. KRIZAN, D. KRUCKER, S. KUPPER, T. KVARATSKHELIIA, A. LANYOV, K. LAU, B. LEWENDEL, T. LOHSE, B. LOMONOSOV, R. MANNER, R. MANKEL, S. MASCIOCCHI, I. MASSA, I. MATCHIKHILIAN, G. MEDIN, M. MEDINNIS, M. MEVIUS, A. MICHETTI, YU. MIKHAILOV, R. MIZUK, R. MURESAN, M.ZUR NEDDEN, M. NEGODAEV, M. NORENBERG, S. NOWAK, M.T. NUNEZ PARDO DE VERA, M. OUCHRIF, F. OULD-SAADA, C. PADILLA, D. PERALTA, R. PERNACK, R. PESTOTNIK, B.A. PETERSEN, M. PICCININI, M.A. PLEIER, M. POLI, V. POPOV, D. POSE, S. PRYSTUPA, V.M. PUGATCH, Y. PYLYPCHENKO, J. PYRLIK, K. REEVES, D. REING, H. RICK, I. RIU, P. ROBMANN, I. ROSTOVTSEVA, V. RYBNIKOV, F. SANCHEZ, A. SBRIZZI, M. SCHMELLING, B. SCHMIDT, A. SCHREINER, H. SCHRODER, U. SCHWANKE, ALAN J. SCHWARTZ, ANDREAS S. SCHWARZ, B. SCHWENNINGER, B. SCHWINGENHEUER, F. SCIACCA, N. SEMPRINI-CESARI, S. SHUVALOV, L. SILVA, L. SOZUER, S. SOLUNIN, A. SOMOV, S. SOMOV, J. SPENGLER, R. SPIGHI, A. SPIRIDONOV, A. STANOVNIK, M. STARIC, C. STEGMANN, H.S. SUBRAMANIA, M. SYMALLA, I. TIKHOMIROV, M. TITOV, I. TSAKOV, U. UWER, C. VAN ELDIK, YU. VASSILIEV, M. VILLA, A. VITALE, I. VUKOTIC, H. WAHLBERG, A.H. WALENTA, M. WALTER, J.J. WANG, D. WEGENER, U. WERTHENBACH, H. WOLTERS, R. WURTH, A. WURZ, YU. ZAITSEV, M. ZAVERTYAEV, T. ZEUNER, A. ZHELEZOV, Z. ZHENG, R. ZIMMERMANN, T. ZIVKO, A. ZOCCOLI, Geometry, (Astro)-Particles Physics, and Mathematical Analysis

Subjects
Physics and Astronomy (miscellaneous), Nuclear Theory, Electron, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, medicine, SDG 7 - Affordable and Clean Energy, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, Muon, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, HERA, Polarization (waves), 3. Good health, medicine.anatomical_structure, High Energy Physics::Experiment, Nucleus, Storage ring, HERA-B
Abstract

Ratios of the Psi' over the J/psi production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The Psi' and J/psi states were reconstructed in both the mu+mu- and the e+e- decay modes. The measurements covered the kinematic range -0.35 < x_F < 0.1 with transverse momentum p_T < 4.5 GeV/c. The Psi' to J/psi production ratio is almost constant in the covered x_F range and shows a slow increase with p_T. The angular dependence of the ratio has been used to measure the difference of the Psi' and J/psi polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is R_psi'(mu)/R_psi'(e)=1.00+-0.08+-0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B'(mu)*B(e))/(B(mu)*B'(e)), of Psi' and J/psi in the two channels., Comment: 20 pages, 9 figures

Published
2007
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12. THE ELECTROMAGNETIC CALORIMETER OF THE HERA-B EXPERIMENT

Author

M. Zuffa, Roberto Spighi, E. Tarkovsky, Benedetto Giacobbe, C. Baldanza, O. Gouchtchine, Mauro Villa, A. Vitale, I. Matchikhilian, S. Shuvalov, Nicola Semprini-Cesari, M. Bargiotti, V. Rusinov, M. Poli, A. Soldatov, Yu. Gilitsky, M. Capponi, Yu.V. Mikhailov, S. Meneghini, I. D'Antone, Pietro Faccioli, E. Novikov, Antonio Zoccoli, M. Rizzi, M. Bruschi, M. Piccinini, I. Massa, A. Golutvin, B. Bobchenko, G. Avoni, Stefania Vecchi, I. Lax, S. De Castro, A. Bertin, P. CENCI ET AL., C. CECCHI, P. CENCI, P. LUBRANO, B. Bobchenko, A. Golutvin, O. Gouchtchine, I. Matchikhilian, E. Novikov, V. Rusinov, S. Shuvalov, E. Tarkovsky, G. Avoni, C. Baldanza, M. Bargiotti, A. Bertin, M. Bruschi, M. Capponi, I. D'Antone, S. De Castro, P. Faccioli, B. Giacobbe, I. Lax, I. Massa, S. Meneghini, M. Piccinini, M. Poli, M. Rizzi, N. Semprini-Cesari, R. Spighi, S. Vecchi, M. Villa, A. Vitale, A. Zoccoli, M. Zuffa, Yu. Gilitsky, Yu. Mikhailov, and A. Soldatov

Subjects
Nuclear physics, Physics, Electromagnetic calorimeter, Reaction calorimeter, HERA-B
Published
2005
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13. Limits for the central production of Theta+ and Xi(--)pentaquarks in 920-GeV pA collisions

Author

I, Abt, M, Adams, M, Agari, H, Albrecht, A, Aleksandrov, V, Amaral, A, Amorim, S J, Aplin, V, Aushev, Y, Bagaturia, V, Balagura, M, Bargiotti, O, Barsukova, J, Bastos, J, Batista, C, Bauer, Th S, Bauer, A, Belkov, Ar, Belkov, I, Belotelov, A, Bertin, B, Bobchenko, M, Böcker, A, Bogatyrev, G, Bohm, M, Bräuer, M, Bruinsma, M, Bruschi, P, Buchholz, T, Buran, J, Carvalho, P, Conde, C, Cruse, M, Dam, K M, Danielsen, M, Danilov, S De, Castro, H, Deppe, X, Dong, H B, Dreis, V, Egorytchev, K, Ehret, F, Eisele, D, Emeliyanov, S, Essenov, L, Fabbri, P, Faccioli, M, Feuerstack-Raible, J, Flammer, B, Fominykh, M, Funcke, Ll, Garrido, B, Giacobbe, J, Gläss, D, Goloubkov, Y, Golubkov, A, Golutvin, I, Golutvin, I, Gorbounov, A, Gorisek, O, Gouchtchine, D C, Goulart, S, Gradl, W, Gradl, F, Grimaldi, J, Groth-Jensen, Yu, Guilitsky, J D, Hansen, J M, Hernández, W, Hofmann, T, Hott, W, Hulsbergen, U, Husemann, O, Igonkina, M, Ispiryan, T, Jagla, C, Jiang, H, Kapitza, S, Karabekyan, N, Karpenko, S, Keller, J, Kessler, F, Khasanov, Yu, Kiryushin, E, Klinkby, K T, Knöpfle, H, Kolanoski, S, Korpar, C, Krauss, P, Kreuzer, P, Krizan, D, Krücker, S, Kupper, T, Kvaratskheliia, A, Lanyov, K, Lau, B, Lewendel, T, Lohse, B, Lomonosov, R, Männer, S, Masciocchi, I, Massa, I, Matchikhilian, G, Medin, M, Medinnis, M, Mevius, A, Michetti, Yu, Mikhailov, R, Mizuk, R, Muresan, M, Zur Nedden, M, Negodaev, M, Nörenberg, S, Nowak, M T, Núñez Pardo de Vera, M, Ouchrif, F, Ould-Saada, C, Padilla, D, Peralta, R, Pernack, R, Pestotnik, M, Piccinini, M A, Pleier, M, Poli, V, Popov, A, Pose, D, Pose, S, Prystupa, V, Pugatch, Y, Pylypchenko, J, Pyrlik, K, Reeves, D, Ressing, H, Rick, I, Riu, P, Robmann, I, Rostovtseva, V, Rybnikov, F, Sánchez, A, Sbrizzi, M, Schmelling, B, Schmidt, A, Schreiner, H, Schröder, A J, Schwartz, A S, Schwarz, B, Schwenninger, B, Schwingenheuer, F, Sciacca, N, Semprini-Cesari, S, Shuvalov, L, Silva, K, Smirnov, L, Sözüer, S, Solunin, A, Somov, S, Somov, J, Spengler, R, Spighi, A, Spiridonov, A, Stanovnik, M, Staric, C, Stegmann, H S, Subramania, M, Symalla, I, Tikhomirov, M, Titov, I, Tsakov, U, Uwer, C, van Eldik, Yu, Vassiliev, M, Villa, A, Vitale, I, Vukotic, H, Wahlberg, A H, Walenta, M, Walter, J J, Wang, D, Wegener, U, Werthenbach, H, Wolters, R, Wurth, A, Wurz, Yu, Zaitsev, M, Zavertyaev, G, Zech, T, Zeuner, A, Zhelezov, Z, Zheng, R, Zimmermann, T, Zivko, and A, Zoccoli

Subjects
(Theta(1540) Lambda(1520)) [yield], branching ratio [channel cross section], (Xi(1862) Xi(1530)) [yield], tungsten, carbon, HERA-B, Xi(1862) [postulated particle], (Xi- pi-) [mass spectrum], DESY HERA Stor, (p K0(S)) [mass spectrum], search for [pentaquark], ddc:550, titanium, upper limit, 920 GeV, Theta(1540), inclusive reaction [p nucleus], experimental results
Abstract

We have searched for Theta+(1540) and Xi(--)(1862) pentaquark candidates in proton-induced reactions on C, Ti, and W targets at midrapidity and square root of s = 41.6 GeV. In 2 x 10(8) inelastic events we find no evidence for narrow (sigma approximately 5 MeV) signals in the Theta+ --pK0(S) and Xi(--) --Xi- pi- channels; our 95% C.L. upper limits (UL) for the inclusive production cross section times branching fraction B dsigma/dy/(y approximately 0) are (4-16) mub/N for a Theta+ mass between 1521 and 1555 MeV, and 2.5 mub/N for the Xi(--). The UL of the yield ratio of Theta+/Lambda(1520)(3-12)% is significantly lower than model predictions. Our UL of B Xi(--)/Xi(1530)04% is at variance with the results that have provided the first evidence for the Xi(--).

Published
2004
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14. Angular distributions of leptons from J/ ψ's produced in 920 GeV fixed-target proton-nucleus collisions

Author

V. Rybnikov, Nicola Semprini-Cesari, C. B. Krauss, A. Belkov, B. Schmidt, I. Belotelov, H. Kapitza, A. H. Walenta, J. J. Wang, Th. S. Bauer, M. Böcker, A. Schreiner, Marco Bruschi, I. Massa, Y. Pylypchenko, H. S. Subramania, M. Ispiryan, A. Bogatyrev, J. Spengler, Peter Robmann, T. Buran, E. B. Klinkby, S. Gradl, B. Fominykh, Wouter Hulsbergen, Y. Guilitsky, D. Reßing, A. J. Schwartz, Jose M Hernandez, B. Giacobbe, O. Barsukova, I. Tsakov, Imma Riu, D. Goloubkov, Yu.V. Mikhailov, R. Spighi, Antonio Zoccoli, K. Ehret, S. J. Aplin, B. Schwingenheuer, P. Križan, S. De Castro, A. Golutvin, B. Bobchenko, C. Jiang, J. Kessler, M. Danilov, S. Prystupa, Antonio Sbrizzi, Vladislav Balagura, M. Bräuer, M. Walter, I. Rostovtseva, M. T. Nunez Pardo de Vera, M. Agari, A. Lanyov, O. Igonkina, T. Jagla, Y. Vassiliev, F. Sciacca, I. Kisel, Ulrich Werthenbach, X. Dong, J. Pyrlik, J. Bastos, P. Kreuzer, M. Nörenberg, Vasco Amaral, António Amorim, D. C. Goulart, Werner Hofmann, S. Solunin, V. Egorytchev, M. Starič, A. Michetti, A. Wurz, R. Muresan, H. Rick, M. Poli, B. Aa. Petersen, A. Somov, M. Mevius, S. Karabekyan, Laura Silva, Alexander Spiridonov, I. Abt, M. Bargiotti, B. Lewendel, T. Živko, M. Feuerstack-Raible, Mogens Dam, F. Eisele, S. Essenov, S. Keller, S. Xella-Hansen, Sebastian Nowak, K. M. Danielsen, Reinhard Männer, Helmut Wolters, T. Zeuner, C. Stegmann, Valery Pugatch, M. Adams, Farid Ould-Saada, C. van Eldik, C. Bauer, D. Wegener, H. Wahlberg, W. Gradl, J.D. Hansen, Maurizio Piccinini, B. Lomonosov, L. Sozuer, H. Albrecht, A. Zhelezov, A. Gellrich, M. Medinnis, M. zur Nedden, I. Gorbounov, R. Mankel, A. Vitale, R. Pernack, M. Negodaev, Peter Buchholz, Kwong Lau, H. B. Dreis, João Carvalho, Vladimir Popov, Y. Bagaturia, R. Wurth, D. Pose, O. Gouchtchine, K. T. Knöpfle, Pietro Faccioli, V. Aushev, I. Tikhomirov, G. Medin, I. Matchikhilian, G. Bohm, F. Grimaldi, N.N. Karpenko, Ll. Garrido, Maksym Titov, H. Deppe, T. Kvaratskheliia, U. Uwer, J. Batista, Hermann Kolanoski, M. Funcke, S. Kupper, R. Mizuk, B. Schwenninger, Andrej Gorišek, S. Masciocchi, F. Khasanov, Yu.T. Kiryushin, D. Peralta, M. Bruinsma, Kendall Reeves, A. Stanovnik, I. Vukotic, D. Krücker, Yu. A. Golubkov, A. S. Schwarz, T. Hott, P. Conde, Igor Golutvin, Yu. Zaitsev, F. Sanchez, R. Pestotnik, S. Shuvalov, U. Schwanke, Thomas Lohse, Mikhail Zavertyaev, C. Cruse, Mauro Villa, M. A. Pleier, Marcus Hohlmann, Samo Korpar, U. Husemann, R. Zimmermann, A. Bertin, Dmitry Emeliyanov, Z. Zheng, M. Symalla, Laura Fabbri, J. Groth-Jensen, C. Padilla, J. Gläß, M. Schmelling, J. Flammer, H. Schröder, S. Somov, Aleksandar Aleksandrov, M. Ouchrif, Universitat de Barcelona, PRT, ESP, UKR, CHN, DEU, NOR, USA, FRA, SVN, CHE, DNK, DIP. DI FISICA, DIPARTIMENTO DI FISICA E ASTRONOMIA 'AUGUSTO RIGHI', Facolta' di INGEGNERIA, SECONDA FACOLTA' DI INGEGNERIA DELL'UNIVERSITA' DI BOLOGNA CON SEDE CESENA, I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, A. AMORIM, S.J. APLIN, V. AUSHEV, Y. BAGATURIA, V. BALAGURA, M. BARGIOTTI, O. BARSUKOVA, J. BASTOS, J. BATISTA, C. BAUER, TH.S. BAUER, A. BELKOV, AR. BELKOV, I. BELOTELOV, A. BERTIN, B. BOBCHENKO, M. BOCKER, A. BOGATYREV, G. BOHM, M. BRAUER, M. BRUINSMA, M. BRUSCHI, P. BUCHHOLZ, T. BURAN, J. CARVALHO, P. CONDE, C. CRUSE, M. DAM, K.M. DANIELSEN, M. DANILOV, S. DE CASTRO, H. DEPPE, X. DONG, H.B. DREIS, V. EGORYTCHEV, K. EHRET, F. EISELE, D. EMELIYANOV, S. ERHAN, S. ESSENOV, L. FABBRI, P. FACCIOLI, M. FEUERSTACK-RAIBLE, J. FLAMMER, B. FOMINYKH, M. FUNCKE, LL. GARRIDO, A. GELLRICH, B. GIACOBBE, J. GLA, D. GOLOUBKOV, Y. GOLUBKOV, A. GOLUTVIN, I. GOLUTVIN, I. GORBOUNOV, A. GORISEK, O. GOUCHTCHINE, D.C. GOULART, S. GRADL, W. GRADL, F. GRIMALDI, YU. GUILITSKY, J.D. HANSEN, J.M. HERNANDEZ, W. HOFMANN, M. HOHLMANN, T. HOTT, W. HULSBERGEN, U. HUSEMANN, O. IGONKINA, M. ISPIRYAN, T. JAGLA, C. JIANG, H. KAPITZA, S. KARABEKYAN, N. KARPENKO, S. KELLER, J. KESSLER, F. KHASANOV, YU. KIRYUSHIN, I. KISEL, E. KLINKBY, K.T. KNOPFLE, H. KOLANOSKI, S. KORPAR, C. KRAUSS, P. KREUZER, P. KRIZAN, D. KRUCKER, S. KUPPER, T. KVARATSKHELIIA, A. LANYOV, K. LAU, B. LEWENDEL, T. LOHSE, B. LOMONOSOV, R. MANNER, R. MANKEL, S. MASCIOCCHI, I. MASSA, I. MATCHIKHILIAN, G. MEDIN, M. MEDINNIS, M. MEVIUS, A. MICHETTI, YU. MIKHAILOV, R. MIZUK, R. MURESAN, M.ZUR NEDDEN, M. NEGODAEV, M. NORENBERG, S. NOWAK, M.T. NUNEZ PARDO DE VERA, M. OUCHRIF, F. OULD-SAADA, C. PADILLA, D. PERALTA, R. PERNACK, R. PESTOTNIK, B.A. PETERSEN, M. PICCININI, M.A. PLEIER, M. POLI, V. POPOV, D. POSE, S. PRYSTUPA, V.M. PUGATCH, Y. PYLYPCHENKO, J. PYRLIK, K. REEVES, D. REING, H. RICK, I. RIU, P. ROBMANN, I. ROSTOVTSEVA, V. RYBNIKOV, F. SANCHEZ, A. SBRIZZI, M. SCHMELLING, B. SCHMIDT, A. SCHREINER, H. SCHRODER, U. SCHWANKE, ALAN J. SCHWARTZ, ANDREAS S. SCHWARZ, B. SCHWENNINGER, B. SCHWINGENHEUER, F. SCIACCA, N. SEMPRINI-CESARI, S. SHUVALOV, L. SILVA, L. SOZUER, S. SOLUNIN, A. SOMOV, S. SOMOV, J. SPENGLER, R. SPIGHI, A. SPIRIDONOV, A. STANOVNIK, M. STARIˇC, C. STEGMANN, H. S. SUBRAMANIA, M. SYMALLA, I. TIKHOMIROV, M. TITOV, I. TSAKOV, U. UWER, C. VAN ELDIK, YU. VASSILIEV, M. VILLA, A. VITALE, I. VUKOTIC, H. WAHLBERG, A. H. WALENTA, M. WALTER, J. J. WANG, D. WEGENER, U. WERTHENBACH, H. WOLTERS, R. WURTH, A. WURZ, S. XELLA-HANSEN, YU. ZAITSEV, M. ZAVERTYAEV, T. ZEUNER, A. ZHELEZOV, Z. ZHENG, R. ZIMMERMANN, T. ˇZIVKO, and A. ZOCCOLI

Subjects
Astrofísica, Particle physics, Teoria quàntica de camps, Proton, Physics and Astronomy (miscellaneous), Astronomy, Nuclear physics, Elementary particle, Astrophysics, 01 natural sciences, Partícules (Física nuclear), High Energy Physics - Experiment, symbols.namesake, 0103 physical sciences, Feynman diagram, ddc:530, 010306 general physics, Anisotropy, Nuclear Experiment, Engineering (miscellaneous), Particles (Nuclear physics), Physics, 010308 nuclear & particles physics, HERA, Helicity, Quantum field theory, symbols, Astronomia, High Energy Physics::Experiment, Física nuclear, Lepton, HERA-B
Abstract

A study of the angular distributions of leptons from decays of J/psi's produced in p-C and p-W collisions at sqrt{s}=41.6 GeV has been performed in the Feynman-x region -0.34 < x_F < 0.14 and for transverse momentum up to 5.4 GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a clean selection of 2.3 x 10^5 J/psi's reconstructed in both the e^+ e^- and mu^+ mu^- decay channels, indicate that J/psi's are produced with longitudinal polarization. The magnitude of the effect is maximal at low p_T. For p_T >1 GeV/c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the Collins-Soper frame and almost vanishes in the helicity frame, where, instead, a significant azimuthal anisotropy arises., Comment: 9 pages, 3 figures, 8 tables

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