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14 results on '"von Harrach D"'

1. The COMPASS RICH-1 detector upgrade

Author

Abbon, P., Alekseev, M., Angerer, H., Apollonio, M., Birsa, R., Bordalo, P., Bradamante, F., Bressan, A., Busso, L., Chiosso, M., Ciliberti, P., Colantoni, M. L., Costa, S., Dalla Torre, S., Dafni, T., Delagnes, E., Deschamps, H., Diaz, V., Dibiase, N., Duic, V., Eyrich, W., Faso, D., Ferrero, A., Finger, M., Finger, M., Fischer, H., Gerassimov, S., Giorgi, M., Gobbo, B., Hagemann, R., von Harrach, D., Heinsius, F. H., Joosten, R., Ketzer, B., Königsmann, K., Kolosov, V. N., Konorov, I., Kramer, D., Kunne, F., Lehmann, A., Levorato, S., Maggiora, A., Magnon, A., Mann, A., Martin, A., Menon, G., Mutter, A., Nähle, O., Nerling, F., Neyret, D., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pesaro, G., Polak, J., Rebourgeard, P., Robinet, F., Rocco, E., Schiavon, P., Schill, C., Schröder, W., Silva, L., Slunecka, M., Sozzi, F., Steiger, L., Sulc, M., Svec, M., Tessarotto, F., Teufel, A., Wollny, H., Abbon, P., Alekseev, M., Angerer, H., Apollonio, M., Birsa, R., Bordalo, P., Bradamante, F., Bressan, A., Busso, L., Chiosso, M., Ciliberti, P., Colantoni, M. L., Costa, S., Dalla Torre, S., Dafni, T., Delagnes, E., Deschamps, H., Diaz, V., Dibiase, N., Duic, V., Eyrich, W., Faso, D., Ferrero, A., Finger, M., Finger, M., Fischer, H., Gerassimov, S., Giorgi, M., Gobbo, B., Hagemann, R., von Harrach, D., Heinsius, F. H., Joosten, R., Ketzer, B., Königsmann, K., Kolosov, V. N., Konorov, I., Kramer, D., Kunne, F., Lehmann, A., Levorato, S., Maggiora, A., Magnon, A., Mann, A., Martin, A., Menon, G., Mutter, A., Nähle, O., Nerling, F., Neyret, D., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pesaro, G., Polak, J., Rebourgeard, P., Robinet, F., Rocco, E., Schiavon, P., Schill, C., Schröder, W., Silva, L., Slunecka, M., Sozzi, F., Steiger, L., Sulc, M., Svec, M., Tessarotto, F., Teufel, A., and Wollny, H.

Abstract

The COMPASS experiment at CERN provides hadron identification in a wide momentum range employing a large size gaseous Ring Imaging CHerenkov detector (RICH). The presence of large uncorrelated background in the COMPASS environment was limiting the efficiency of COMPASS RICH-1 in the very forward regime. A major upgrade of RICH-1 required a new technique for Cherenkov photon detection at count rates of several $10^6/{\rm s}$per channel in the central detector part, and a read-out system allowing for trigger rates of up to 100 kHz. To cope with these requirements, the photon detectors of the central region have been replaced with a fast photon detection system described here, while, in the peripheral regions, the existing multi-wire proportional chambers with CsI photo-cathodes have been equipped with a new read-out system based on APV preamplifiers and flash ADC chips. The new system consists of multi-anode photo-multiplier tubes (MAPMTs) coupled to individual fused silica lens telescopes, and fast read-out electronics based on the MAD4 amplifier-discriminator and the dead-time free F1 TDC chip. The project was completely designed and implemented in less than two years: The upgraded detector is in operation since the 2006 CERN SPS run. We present the photon detection design, constructive aspects and test studies to characterise the single photon response of the MAPMTs coupled to the read-out system as well as the detector performance based on the 2006 data.

Published
2008
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2. A measurement of the ratio of the nucleon structure function in copper and deuterium

Author

Ashman, J., Badelek, B., Baum, G., Beaufays, J., Bee, C. P., Benchouk, C., Bird, I. G., Brown, S. C., Caputo, M. C., Cheung, H. W. K., Chima, J. S., Ciborowski, J., Clifft, R., Coignet, G., Combley, F., Court, G., d'Agostini, G., Drees, J., Düren, M., Dyce, N., Edwards, A. W., Edwards, M., Ernst, T., Ferrero, M. I., Francis, D., Gabathuler, E., Gajewski, J., Gamet, R., Gibson, V., Gillies, J., Grafström, P., Hamacher, K., von Harrach, D., Hayman, P., Holt, J. R., Hughes, V. W., Jacholkowska, A., Jones, T., Kabuss, E. M., Korzen, B., Krüner, U., Kullander, S., Landgraf, U., Lanske, D., Lettenström, F., Lindqvist, T., Matthews, M., Mizuno, Y., Mönig, K., Montanet, F., Nassalski, J., Niinikoski, T., Norton, P. R., Oakham, F. G., Oppenheim, R. F., Osborne, A. M., Papavassiliou, V., Pavel, N., Peroni, C., Peschel, H., Piegaia, R., Pietrzyk, B., Povh, B., Renton, P., Rieubland, J. M., Rith, K., Rondio, E., Ropelewski, L., Salmon, D., Sandacz, A., Schröder, T., Schüler, K. P., Schultze, K., Shibata, T. -A., Sloan, T., Staiano, A., Stier, H. E., Stock, J., Taylor, G. N., Thompson, J. C., Walcher, T., Toth, J., Urban, L., Wallucks, W., Wheeler, S., Williams, W. S. C., Wimpenny, S. J., Windmolders, R., Womersley, J., and Ziemons, K.

Abstract

Results are presented on the ratios of the nucleon structure function in copper to deuterium from two separate experiments. The data confirm that the nucleon structure function,F2, is different for bound nucleons than for the quasi-free ones in the deuteron. The redistribution in the fraction of the nucleon's momentum carried by quarks is investigated and it is found that the data are compatible with no integral loss of quark momenta due to nuclear effects.

Published
1993
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3. Comparison of forward hadrons produced in muon interactions on nuclear targets and deuterium

Author

Ashman, J., Badelek, B., Baum, G., Beaufays, J., Bee, C. P., Benchouk, C., Bird, I. G., Brown, S. C., Caputo, M. C., Cheung, H. W. K., Chima, J. S., Ciborowski, J., Clifft, R., Coignet, G., Combley, F., Court, G., d'Agostini, G., Drees, J., Düren, M., Dyce, N., Edwards, A. W., Edward, M., Ernst, T., Ferrero, M. I., Francis, D., Gabathuler, E., Gamet, R., Gibson, V., Gillies, J., Grafström, P., Hamacher, K., von Harrach, D., Hayman, P., Holt, J. R., Hughes, V. W., Jacholkowska, A., Jones, T., Kabuss, E. M., Korzen, B., Krüner, U., Kullander, S., Landgraf, U., Lanske, D., Lettenström, F., Lindqvist, T., Loken, J., Matthews, M., Mizuno, Y., Mönig, K., Montanet, F., Nagy, E., Nassalski, J., Niinikoski, T., Norton, P. R., Oakham, F. G., Oppenheim, R. F., Osborne, A. M., Papavassiliou, V., Pavel, N., Peroni, C., Peschel, H., Piegaia, R., Pietrzyk, B., Pietrzyk, U., Povh, B., Renton, P., Rieubland, J. M., Rith, K., Rondio, E., Ropelewski, L., Salmon, D., Sandacz, A., Schröder, T., Schüler, K. P., Schultze, K., Shibata, T. -A., Sloan, T., Staiano, A., Stier, H. E., Stock, J., Taylor, G. N., Thompson, J. C., Walcher, T., Toth, J., Urban, L., Urban, L., Wallucks, W., Wheeler, S., Williams, W. S. C., Wimpenny, S. J., Windmolders, R., Womersley, J., and Ziemons, K.

Abstract

Differential multiplicities of forward produced hadrons in deep inelastic muon scattering on nuclear targets have been compared with those from deuterium. The ratios are observed to increase towards unity as the virtual photon energy increases with no significant dependence on the other muon kinematic variables. The hadron transverse momentum distribution is observed to be broadened in nuclear targets. The dependence on the remaining hadron variables is investigated and the results are discussed in the framework of intranuclear interaction models and in the context of the EMC effect.

Published
1991
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5. Transverse momentum distributions for exclusiveρ0 muoproduction

Author

Amaudruz, P., Arneodo, M., Arvidson, A., Badelek, B., Baum, G., Beaufays, J., Bird, I. G., Botje, M., Broggini, C., Brückner, W., Brüll, A., Burger, W. J., Ciborowski, J., van Dantzig, R., Döbbeling, H., Domingo, J., Drinkard, J., Engelien, H., Ferrero, M. I., Fluri, L., Grafstrom, P., von Harrach, D., van der Heijden, M., Heusch, C., Ingram, Q., Janson, K., de Jong, M., Kabuß, E. M., Kaiser, R., Ketel, T. J., Klein, F., Korzen, B., Krüner, U., Kullander, S., Landgraf, U., Lettenström, F., Lindqvist, T., Mallot, G. K., Mariotti, C., van Middelkoop, G., Mizuno, Y., Nassalski, J., Nowotny, D., Pavel, N., Peroni, C., Peschel, H., Povh, B., Rieger, R., Rith, K., Röhrich, K., Rondio, E., Ropelewski, L., Sandacz, A., Scholz, C., Schumacher, R., Sennhauser, U., Sever, F., Shibata, T. -A., Siebler, M., Simon, A., Staiano, A., Taylor, G., Treichel, M., Vuilleumier, J. L., Walcher, T., Windmolders, R., and Zetsche, F.

Abstract

We have studied transverse momentum distributions for exclusiveρ0 muoproduction on protons and heavier nuclei at 22<25 GeV2. TheQ2 dependence of the slopes of thept2 andt′ distributions is discussed. The influence of the non-exclusive background is investigated. Thept2-slope for exclusive events is 4.3±0.6±0.7 GeV−2 at largeQ2. Thept2 spectra are much softer than inclusivept2 spectra of leading hadrons produced in deep inelastic scattering.

Published
1992
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6. Muoproduction ofJ/ψ and the gluon distribution of the nucleon

Author

Ashman, J., Badelek, B., Baum, G., Beaufays, J., Bee, C. P., Benchouk, C., Bird, I. G., Brown, S. C., Caputo, M. C., Cheung, H. W. K., Chima, J. S., Ciborowski, J., Clifft, R., Coignet, G., Combley, F., Court, G., d'Agostini, G., Drees, J., Düren, M., Dyce, N., Edwards, A. W., Edwards, M., Ernst, T., Ferrero, M. I., Francis, D., Gabathuler, E., Gajewski, J., Gamet, R., Gibson, V., Gillies, J., Grafström, P., Hamacher, K., von Harrach, D., Hayman, P., Holt, J. R., Hughes, V. W., Jacholkowska, A., Jones, T., Kabuss, E. M., Korzen, B., Krüner, U., Kullander, S., Landgraf, U., Lanske, D., Lettenström, F., Lindqvist, T., Matthews, M., Mizuno, Y., Mönig, K., Montanet, F., Nassalski, J., Niinikoski, T., Norton, P. R., Oakham, F. G., Oppenheim, R. F., Osborne, A. M., Papavassiliou, V., Pavel, N., Peroni, C., Peschel, H., Piegaia, R., Pietrzyk, B., Povh, B., Renton, P., Rieubland, J. M., Rith, K., Rondio, E., Ropelewski, L., Salmon, D., Sandacz, A., Schröder, T., Schüler, K. P., Schultze, K., Shibata, T. -A., Sloan, T., Staiano, A., Stier, H. E., Stock, J., Taylor, G. N., Thompson, J. C., Walcher, T., Toth, J., Urban, L., Wallucks, W., Wheeler, S., Williams, W. S. C., Wimpenny, S. J., Windmolders, R., Womersley, J., and Ziemons, K.

Abstract

Measurements are presented of the inclusive distributions of theJ/? meson produced by muons of energy 200 GeV from an ammonia target. The gluon distribution of the nucleon has been derived from the data in the range 0.04

Published
1992
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7. The Q2 dependence of the structure function ratio F2Sn/F2C and the difference RSn − RC deep inelastic muon scattering

Author

Arneodo, M., Arvidson, A., Badee&z.xl;k, B., Ballintijn, M., Baum, G., Beaufays, J., Bird, I.G., Bjo¨rkholm, P., Botje, M., Broggini, C., Bru¨ckner, W., Bru¨ll, A., Burger, W.J., Ciborowski, J., van Dantzig, R., Do¨bbeling, H., Dyring, A., Engelien, H., Ferrero, M.I., Fluri, L., Gaul, U., Granier, T., Grosse-Perdekamp, M., von Harrach, D., van der Heijden, M., Heusch, C., Ingram, Q., de Jong, M., Kabuß, E.M., Kaiser, R., Ketel, T.J., Klein, F., Kullander, S., Kurek, K., Landgraf, U., Lindqvist, T., Mallot, G.K., Mariotti, C., van Middelkoop, G., Milsztajn, A., Mizuno, Y., Most, A., Mu¨cklich, A., Nassalski, J., Nowotny, D., Oberski, J., Paic´, A., Peroni, C., Povh, B., Prytz, K., Rieger, R., Rith, K., Ro¨hrich, K., Rondio, E., Ropelewski, L., Sandacz, A., Sanders, D., Scholz, C., Seitz, R., Sever, F., Shibata, T.-A., Siebler, M., Simon, A., Staiano, A., Szleper, M., Ta&z.xl;czaa&z.xl;, W., Tzamouranis, Y., Virchaux, M., Vuilleumier, J.L., Walcher, T., Windmolders, R., Witzmann, A., Zaremba, K., and Zetsche, F.

Abstract

The Q2 dependence of the structure function ratio F2Sn/F2Cfor 0.01 < x < 0.75 and 1 < Q2 < 140 GeV2 is reported. For x < 0.1 the size of shadowing decreases with ln Q2 and the maximum rate is about 0.04 at x = 0.01. The rate decreases with x and is compatible with zero for x  0.1. The difference RSn − RC, where R is the ratio of longitudinally to transversely polarised virtual photon absorption cross sections, is also given. No dependence on x is seen and the average value is 0.040 ± 0.021 (stat.) ± 0.026 (syst.) at a mean Q2 of 10 GeV2.

Published
1996
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8. The A dependence of the nuclear structure function ratios

Author

Arneodo, M., Arvidson, A., Badee&z.xl;k, B., Ballintijn, M., Baum, G., Beaufays, J., Bird, I.G., Bjo¨rkholm, P., Botje, M., Broggini, C., Bru¨ckner, W., Bru¨ll, A., Burger, W.J., Ciborowski, J., van Dantzig, R., Dyring, A., Engelien, H., Ferrero, M.I., Fluri, L., Gaul, U., Granier, T., Grosse-Perdekamp, M., von Harrach, D., van der Heijden, M., Heusch, C., Ingram, Q., de Jong, M., Kabuß, E.M., Kaiser, R., Ketel, T.J., Klein, F., Kullander, S., Kurek, K., Landgraf, U., Lindqvist, T., Mallot, G.K., Mariotti, C., van Middelkoop, G., Milsztajn, A., Mizuno, Y., Most, A., Mu¨cklich, A., Nassalski, J., Nowotny, D., Oberski, J., Paic´, A., Peroni, C., Povh, B., Prytz, K., Rieger, R., Rith, K., Ro¨hrich, K., Rondio, E., Ropelewski, L., Sandacz, A., Sanders, D., Scholz, C., Seitz, R., Sever, F., Shibata, T.-A., Siebler, M., Simon, A., Staiano, A., Szleper, M., Ta&z.xl;czaa&z.xl;, W., Tzamouranis, Y., Virchaux, M., Vuilleumier, J.L., Walcher, T., Windmolders, R., Witzmann, A., Zaremba, K., and Zetsche, F.

Abstract

Results are presented for six nuclei from Be to Pb on the structure function ratios F2A/F2C(x) and their A dependence in deep inelastic muon scattering at 200 GeV incident muon energy. The data cover the kinematic range 0.01 < x < 0.8 with Q2 ranging from 2 to 70 GeV2. The A dependence of nuclear structure function ratios is parametrised and compared to various models.

Published
1996
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9. The Mainz Microtron Mami: A facility portrait with a glimpse at first results

Author

Ahrens, J., Backe, H., von Harrach, D., Kaiser, H., Klein, F., Neuhausen, R., and Walcher, Th.

Abstract

The Mainz Microtron MAMI is one of the accelerators that turned a long dream of nuclear and particle physicists into reqlity. It delivers electrons with a high current of up to 100 pA in cw mode at an energy of 855 MeV. These seemingly modest parameters present two major steps. The high luminosity is usable in coincidence experiments because of the 100% duty factor and thus the full potential of the electroweak probe can be exploited. Secondly, the energy and, therefore, the spatial resolution is just right to look for the compositeness of nuclei and for gross properties of nucleons and mesons. The last aspect, in particular, has gained great importance since an experimental test of chiral symmetry, a fundamental symmetry of QCD, became feasible.

Published
1994
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10. <img src="/fulltext-image.asp?format=htmlnonpaginated&src=88TDKC07R6UUB2QU_html\" border="0" alt=" $\Lambda$" /> and <img src="/fulltext-image.asp?format=htmlnonpaginated&src=88TDKC07R6UUB2QU_html\" border="0" alt=" $\overline{\Lambda}$" /> polarization in lepton induced processes

Author

Kotzinian, A., Bravar, A., and von Harrach, D.

Abstract

Abstract.: The study of the longitudinal polarization of and hyperons produced in polarized deep inelastic scattering, neutrino scattering, and in decays allows one to access the spin dynamics of the quark fragmentation process. Different phenomenological spin transfer mechanisms are considered and predictions for the and longitudinal polarization in various processes using unpolarized and polarized targets are made. Current and future semi-inclusive deep inelastic scattering experiments will soon provide accurate enough data to study these phenomena and distinguish between various models for the spin transfer mechanisms.

Published
1998
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11. Forward produced hadrons in μp and μd scattering and investigation of the charge structure of the nucleon

Author

Ashman, J., Badelek, B., Baum, G., Beaufays, J., Bee, C. P., Benchouk, C., Bird, I. G., Brown, S. C., Caputo, M. C., Cheung, H. W. K., Chima, J. S., Ciborowski, J., Clifft, R., Coignet, G., Combley, F., Court, G., d'Agostini, G., Drees, J., Düren, M., Dycew, N., Edwards, A. W., Edwards, M., Ernst, T., Favier, J., Ferrero, M. I., Francis, D., Gabathuler, E., Gamet, R., Gibson, V., Gillies, J., Grafström, P., Hamacher, K., von Harrach, D., Hayman, P., Holt, J. R., Hughes, V. W., Jacholkowska, A., Jones, T., Kabuss, E. M., Korzen, B., Krüner, U., Kullander, S., Landgraf, U., Lanske, D., Lauterjung, D., Lettenström, F., Lindqvist, T., Loken, J., Matthews, M., Mizuno, Y., Mönig, K., Montanet, F., Nagy, E., Nassalski, J., Niinikoski, T., Norton, P. R., Oakham, F. G., Oppenheim, R. F., Osborne, A. M., Papavassiliou, V., Pavel, N., Peroni, C., Peschel, H., Piegaia, R., Pietrzyt, B., Pietrzyk, U., Povh, B., Renton, P., Rieubland, J. M., Rith, K., Rondio, E., Ropelewski, L., Salmon, D., Sandacz, A., Schlagböhmer, A., Schneider, A., Schröder, T., Schüler, K. P., Schultze, K., Shibata, T. -A., Sloan, T., Staiano, A., Stier, H. E., Stock, J., Taylor, G. N., Thompson, J. C., Walcher, T., Toth, J., Urban, L., Urban, L., Wahlen, H., Wallucks, W., Whalley, M., Wheeler, S., Williams, W. S. C., Wimpenny, S. J., Windmolders, R., Womersley, J., and Ziemons, K.

Abstract

Final data measured with the EMC forward spectrometer are presented on the production of forward charged hadrons in µp and µd scattering at incident beam energies between 100 and 280 GeV. The large statistic of 373 000 events allows a study of the semi-inclusive hadron production as a function ofz,pT2 and T2> in smallQ2,xBj andW bins. Charge multiplicity ratios and differences as a function ofz andxBj are given forp, d andn-targets. From the differences of charge multiplicities the ratio of the valence quark distributions of the protondv(x)/uv(x) is determined for the first time in charged lepton scattering. The Gronau et al. sum rule is tested, the measured sum being 0.31±0.06 stat. ±0.05 syst., compared with the theoretical expectation of 2/7˜0.286. The measured sum corresponds to an absolute value of the ratio of thed andu quark charge of 0.44±0.10 stat.±0.08 syst.

Published
1991
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12. Editorial

Author

Ostrick, M., von Harrach, D., and Walcher, Th.

Abstract

Abstract: Hadron physics addresses a variety of fundamental phenomena arising from the many-body structure of strongly interacting systems. This special issue of the European Physical Journal contains 21 selected papers and review articles. They address key questions in low energy hadron physics and summarise the experimental and theoretical results which have been obtained within the Collaborative Research Center CRC443 – “Many-body structure of strongly interacting systems”.

Published
2011
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14. Measurement of the parity violating asymmetry in the quasielastic electron-deuteron scattering and improved determination of the magnetic strange form factor and the isovector anapole radiative correction.

Author

RÃos, D. Balaguer, Aulenbacher, K., Baunack, S., Diefenbach, J., Gläser, B., von Harrach, D., Imai, Y., KabuÃ, E. -M., Kothe, R., Lee, J.â€H., Merkel, H., EspÃ, M. C. Mora, MÃller, U., Schilling, E., Weinrich, C., Capozza, L., Maas, F. E., Arvieux, J., El-Yakoubi, M. A., and Frascaria, R.

Subjects
*RADIATIVE corrections, *DEUTERON scattering, *ELECTRON-deuteron interactions
Abstract

A new measurement of the parity-violating asymmetry in the electron-deuteron quasielastic scattering for backward angles at ⟨Q²⟩=0.224 (GeV/c)², obtained in the A4 experiment at the Mainz Microtron accelerator (MAMI) facility, is presented. The measured asymmetry is AdPV=(-20.11±0.87stat±1.03sys)Ã--10-6. A combination of these data with the proton measurements of the parity-violating asymmetry in the A4 experiment yields a value for the effective isovector axial-vector form factor of Ge,(T=1)A=-0.19±0.43 and R(T=1),anapA=-0.41±0.35 for the anapole radiative correction. When combined with a reanalysis of measurements obtained in the G0 experiment at the Thomas Jefferson National Accelerator Facility, the uncertainties are further reduced to GsM=0.17±0.11 for the magnetic strange form factors, and R(T=1),anapA=-0.54±0.26. [ABSTRACT FROM AUTHOR]

Published
2016
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