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1. 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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2. Performance of the HERA-B vertex detector system

Author

S. Schaller, M. Zavertiaev, M. Sang, C. Bauer, B. Schwingenheuer, K. T. Knöpfle, S. Masciocchi, M. Dressel, U. Trunk, I. Abt, T. Glebe, M. Bräuer, M. Schmelling, T. Perschke, M. A. Pleier, Valery Pugatch, T. Jagla, F. Sciacca, I. Kisel, and Werner Hofmann

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Detector, Roman pot, DESY, HERA, Nuclear physics, Electromagnetic shielding, Physics::Accelerator Physics, High Energy Physics::Experiment, Instrumentation, Storage ring, Beam (structure), HERA-B
Abstract

The Vertex Detector System (VDS) of the HERA-B experiment is a forward microvertex detector integrated into the HERA proton storage ring at DESY. Double-sided silicon microstrip detectors mounted in Roman pots are operated at typically 1 cm distance from the beam in a LHC-like high radiation environment. This paper presents results from the commissioning of the VDS that show its performance to meet the specifications.

Published
2003
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3. 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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4. 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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5. Radiation hardness of the HERA-B double-sided silicon strip detectors

Author

T. Glebe, M. Dressel, T. Perschke, K. T. Knöpfle, S. Schaller, I. Abt, Valery Pugatch, S. Masciocchi, B. Schwingenheuer, and Christian Bauer

Subjects
Physics, Nuclear and High Energy Physics, Silicon, Physics::Instrumentation and Detectors, business.industry, Detector, chemistry.chemical_element, Biasing, HERA, Fluence, Optics, chemistry, Optoelectronics, High Energy Physics::Experiment, Irradiation, business, Instrumentation, Radiation hardening, HERA-B
Abstract

Irradiation studies of double-sided silicon strip-detectors for the HERA-B experiment have been performed using a setup at a 21 MeV proton beam. A novel method of fluence monitoring has been implemented. The study presented here gives results of a non-uniform irradiation of two HERA-B detector modules built with double-sided detectors made of oxygenated as well as non-oxygenated wafers. The maximum exposed fluence corresponds to about 3×10 14 MIP / cm 2 . The characterization of the detectors was done with a laser and a 106 Ru source. In regions of low-radiation dose, signal over noise ratios of 22 and 16 were measured for n- and p-side, respectively. In the region of maximum fluence, S/N values of ≈17 and ≈15 were obtained at a bias voltage of 450 V for n- and p-strips, respectively. Our measurements establish for both detector types full functionality at fluences varying by two orders of magnitude. Standard and oxygenated detectors do not show any significant difference.

Published
2002
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6. Cluster shapes and cluster sizes in the HERA-B silicon vertex detector

Author

I. Kisel, E. Sexauer, K. T. Knöpfle, M. Schmelling, T. Glebe, S. Schaller, Valery Pugatch, R. Wanke, M. Sang, M. Dressel, F. Sciacca, Christian Bauer, U. Trunk, S. Masciocchi, T. Jagla, T. Perschke, M. Bräuer, I. Abt, B. Schwingenheuer, and Wolfgang Wagner

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Silicon, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Silicon vertex detector, chemistry, Cluster (physics), Cluster size, Silicon detector, High Energy Physics::Experiment, Vertex detector, Instrumentation, HERA-B
Abstract

We report on investigations of shape and size of the clusters on the silicon detectors of the HERA-B vertex detector. The data taken during the commissioning run of 1999 are compared to predictions of model calculations.

Published
2001
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7. The HERA-B vertex detector

Author

Wolfgang Wagner, S. Schaller, I. Abt, T. Perschke, R. Wanke, U. Trunk, C. Bauer, K. T. Knöpfle, M. Sang, E. Sexauer, T. Glebe, Werner Hofmann, I. Kisell, M. Dressel, M. Schmelling, M. Briuer, F. Zurheide, Valery Pugatch, S. Masciocchi, B. Moshous, and B. Schwingenheuer

Subjects
Physics, Nuclear and High Energy Physics, Vertex (computer graphics), Physics::Instrumentation and Detectors, Track (disk drive), Detector, DESY, Iterative reconstruction, Particle detector, Nuclear physics, Nuclear Energy and Engineering, High Energy Physics::Experiment, Electrical and Electronic Engineering, Radiation hardening, HERA-B
Abstract

The design of the vertex detector of the HERA-B experiment at DESY is reviewed, and its components are described. The silicon microstrip detectors were optimized for radiation hardness: results from irradiation tests, reproducing the challenging situation in the experiment, are presented. Since spring 1999, much of the system has been installed and is operational. The detector performance and results from track and vertex reconstruction are presented.

Published
2000
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8. The HERA-B vertex detector system

Author

R. Wanke, C. Bauer, T. Perschke, B. Schwingenheuer, I. Abt, S. Schaller, Wolfgang Wagner, S. Masciocchi, B. Moshous, E. Sexauer, K. T. Knöpfle, T. Jagla, F. Zurheide, Valery Pugatch, U. Trunk, Werner Hofmann, T. Glebe, M. Bräuer, M. Sang, F. Klefenz, M. Dressel, I. Kisel, and M. Schmelling

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Physics::Instrumentation and Detectors, Roman pot, DESY, HERA, Nuclear physics, Physics::Accelerator Physics, CP violation, High Energy Physics::Experiment, Instrumentation, Beam (structure), Storage ring, HERA-B
Abstract

The HERA-B experiment is being built to measure CP violation in the B-system using internal targets at the HERA proton storage ring at DESY. This paper presents an overview of its vertex detector which – apart from an additional superlayer – is realized by a system of 20 Roman pots containing seven superlayers of double-sided silicon microstrip detectors that are operated at 10 mm distance from the proton beam in a high-radiation environment.

Published
2000
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9. Status of the HERA-B vertex detector

Author

S. Schaller, A. van den Brink, I. Abt, M. Dressel, K. T. Knöpfle, L. Seybold, M. Mevius, B. Schwingenheuer, M Merk, M. Schmelling, Valery Pugatch, T. Jagla, T. Glebe, U. Trunk, M. Bräuer, R. Wanke, S. Masciocchi, B. Moshous, K. Riechmann, Christian Bauer, Werner Hofmann, M. Sang, Wolfgang Wagner, E. Sexauer, and T. Perschke

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Detector, HERA, Particle identification, Nuclear physics, CP violation, High Energy Physics::Experiment, B meson, Instrumentation, Lepton, HERA-B
Abstract

The HERA-B experiment is a forward magnetic spectrometer with good particle identification for hadrons and leptons designed to study violation of CP symmetry in the neutral B meson system. The silicon vertex detector operates in a high-rate environment similar to the ones expected at LHC. In this paper we report on our R&D on strip detector design, frontend ASICs, mechanical and thermal engineering, low-mass RF shielding of the HERA proton beam and on the status of our reconstruction software. First experiences with last year's installation are discussed.

Published
2000
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10. Elastic scattering of 58 and 75 MeV photons by 12C and 16O and electromagnetic polarizabilities of the bound nucleon

Author

D. Häger, K. Fuhrberg, Bengt-Olof Nilsson, T. Glebe, Kurt Hansen, E. Kuhlmann, H. Freiesleben, Bent Schröder, Martin Schumacher, B.-E. Andersson, M. Hütt, Leif Nilsson, and M. Ludwig

Subjects
Nuclear physics, Physics, Elastic scattering, Nuclear reaction, Nuclear and High Energy Physics, Photon, Scattering, Compton scattering, Physics::Optics, Neutron, Atomic physics, Nucleon, Small-angle neutron scattering
Abstract

Differential cross sections for elastic scattering of photons by C-12 and O-16 are measured at 58 and 75 MeV photon energies and 45 degrees to 150 degrees scattering angles using the tagged photon ...

Published
1995
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11. Compton scattering of 87 MeV photons by 4He

Author

R. Van de Vyver, Martin Schumacher, Dirk Ryckbosch, D. Häger, Bengt-Olof Nilsson, Bent Schröder, Kurt Hansen, K. Fuhrberg, B.-E. Andersson, M. Hütt, Leif Nilsson, and T. Glebe

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Photon, Nuclear Theory, Compton scattering, Bremsstrahlung, Nuclear physics, Cross section (physics), Dispersion relation, Nuclear cross section, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Differential cross sections for Compton scattering by 4He have been measured at photon energies ranging from 83.7 to 93.8 MeV with a weighted average of 87 MeV using the bremsstrahlung beam of the MAX-LAB (Lund) nuclear-physics facility. The experimental differential cross sections show a pronounced increase at backward angles, strongly differing from predictions based on zero-angle dispersion relations and on the standard method used to calculate the differential cross section at nonzero angles. It is shown that the attempt to explain this effect in terms of quadrupole strength leads to unreasonable properties of the photoabsorption cross section. A parametrization in terms of a shift in the multipolarity ratio of the electromagnetic polarizabilities of the bound nucleon leads to Δβ = − Δα = 7 × 10−4 fm3.

Published
1995
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12. The enhancement of giant-dipole strength and its consequences for the effective mass of the nucleon and the electromagnetic polarizabilities and quadrupole sum-rule of the nucleus

Author

A.I. Milstein, H. Falkenberg, T. Glebe, D. Häger, Martin Schumacher, M. Hütt, and K. Fuhrberg

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Dipole, Effective mass (solid-state physics), Isovector, Polarizability, Nuclear Theory, Quadrupole, Compton scattering, Sum rule in quantum mechanics, Nucleon
Abstract

Using recent experimental results on Compton scattering by 208Pb at energies below pion threshold we explore the effects of enhancement due to mesonic currents and isovector vibrations on the giant resonances of nuclei. Quantitative information is given for the enhancements of the electric polarizability, the diamagnetic susceptibility and the energy-weighted quadrupole sum rule. It is shown that the average of results available from different laboratories on the “nonretarded” enhancement constant KGDR in the A = 197–209 mass range favours an effective nucleon mass of m ∗ m = 3 4 . Some new results for the amplitude of Compton scattering by the giant resonances of nuclei are presented which allow a treatment of the retardation problem in a zero-order approximation.

Published
1994
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13. The HERA-B vertex detector

Author

S. Masciocchi, I. Abt, M. Brauer, L. Dressel, T. Glebe, W. Hofmann, I. Kisel, K.T. Knopfle, B. Moshous, T. Perschke, V. Pugatch, M. Sang, S. Schaller, M. Schmelling, B. Schwingenheuer, E. Sexauer, U. Trunk, W. Wagner, R. Wanke, and F. Zurheide

Published
2003
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14. Compton scattering from the deuteron and extracted neutron polarizabilities

Author

Anders Sandell, B. Lindner, Lennart Isaksson, T. Glebe, Martin Karlsson, Mikael Lundin, Bent Schröder, Jan-Olof Adler, S. Proff, Björn Nilsson, C. Poech, A.I. L'vov, M.I. Levchuk, Kevin Fissum, D. A. Sims, Kurt Hansen, O. Kaltschmidt, Martin Schumacher, D. E. Oner, Per Lilja, Mark Boland, and K. Kossert

Subjects
Physics, Photon, Spectrometer, 010308 nuclear & particles physics, Compton scattering, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Deuterium, 0103 physical sciences, Neutron, Beta (velocity), Sum rule in quantum mechanics, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Differential cross sections for Compton scattering from the deuteron were measured at MAX-lab for incident photon energies of 55 MeV and 66 MeV at nominal laboratory angles of $45^\circ$, $125^\circ$, and $135^\circ$. Tagged photons were scattered from liquid deuterium and detected in three NaI spectrometers. By comparing the data with theoretical calculations in the framework of a one-boson-exchange potential model, the sum and difference of the isospin-averaged nucleon polarizabilities, $\alpha_N + \beta_N = 17.4 \pm 3.7$ and $\alpha_N - \beta_N = 6.4 \pm 2.4$ (in units of $10^{-4}$ fm$^3$), have been determined. By combining the latter with the global-averaged value for $\alpha_p - \beta_p$ and using the predictions of the Baldin sum rule for the sum of the nucleon polarizabilities, we have obtained values for the neutron electric and magnetic polarizabilities of $\alpha_n= 8.8 \pm 2.4$(total) $\pm 3.0$(model) and $\beta_n = 6.5 \mp 2.4$(total) $\mp 3.0$(model), respectively., Comment: 4 pages, 2 figures, revtex. The text is substantially revised. The cross sections are slightly different due to improvements in the analysis

Published
2002

15. Electromagnetic Polarizabilities of Nucleons bound in $^{40}$Ca, $^{16}$O and $^4$He

Author

D. A. Sims, M.-Th. Hütt, C. Pöch, Kurt Hansen, F. Smend, F. Wissmann, Kevin Fissum, S. Proff, O. Kaltschmidt, Martin Schumacher, Bengt-Olof Nilsson, Mikael Lundin, Bent Schröder, T. Glebe, and J.-O. Adler

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Angular range, Photon, Meson, 010308 nuclear & particles physics, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment, Differential (mathematics)
Abstract

Differential cross sections for elastic scattering of photons have been measured for $^{40}$Ca at energies of 58 and 74 MeV and for $^{16}$O and $^4$He at 61 MeV, in the angular range from 45$^o$ to 150$^o$. Evidence is obtained that there are no significant in-medium modifications of the electromagnetic polarizabilities except for those originating from meson exchange currents., 20 pages including 5 Figures

Published
1999

16. Compton scattering from the deuteron and extracted neutron polarizabilities.

Author

Lundin M, Adler JO, Boland M, Fissum K, Glebe T, Hansen K, Isaksson L, Kaltschmidt O, Karlsson M, Kossert K, Levchuk MI, Lilja P, Lindner B, L'vov AI, Nilsson B, Oner DE, Poech C, Proff S, Sandell A, Schröder B, Schumacher M, and Sims DA

Abstract

Differential cross sections for Compton scattering from the deuteron were measured at MAX-Lab for incident photon energies of 55 and 66 MeV at nominal laboratory angles of 45 degrees, 125 degrees, and 135 degrees. Tagged photons were scattered from liquid deuterium and detected in three NaI spectrometers. By comparing the data with theoretical calculations in the framework of a one-boson-exchange potential model, the sum and the difference of the isospin-averaged nucleon polarizabilities, alpha(N)+beta(N)=17.4+/-3.7 and alpha(N)-beta(N)=6.4+/-2.4 (in units of 10(-4) fm(3)), have been determined. By combining the latter with the global-averaged value for alpha(p)-beta(p) and using the predictions of the Baldin sum rule for the sum of the nucleon polarizabilities, we have obtained values for the neutron electric and magnetic polarizabilities of alpha(n)=8.8+/-2.4(total)+/-3.0(model) and beta(n)=6.5-/+2.4(total)-/+3.0(model), respectively.

Published
2003
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