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1,182 results on '"Baumgartner S"'

151. Effect of Viscum album lipohilic extract on human immunocompetent cells in vitro

Author

Weissenstein, U., Toffol-Schmidt, U., Baumgartner, S., and Urech, K.

Subjects
Immunocompetent cells -- Research, Mistletoe -- Health aspects -- Research, Biological sciences, Health, Science and technology
Abstract

Purpose: Viscum album lipohilic extract (VALE) contains triterpenes known to possess biological functions such as antioxidative, anti-inflammatory, immunomodulatory, wound-healing and anticancer activities. Topical application of VALE was shown to be [...]

Published
2011

153. Familiarity, objectivity – and misconduct: Counterstatement to Shaw DM. The Swiss Report on homoeopathy: a case study of research misconduct. Swiss Med Wkly. 2012;142:w13594

Author

Peter F. Matthiessen, Gudrun Bornhöft, Stefanie Maxion-Bergemann, Ursula Wolf, von Ammon K, A Thurneysen, Baumgartner S, and Righetti M

Subjects
medicine.medical_specialty, Misconduct, Law, media_common.quotation_subject, Alternative medicine, medicine, General Medicine, Homeopathy, Psychology, Scientific misconduct, Objectivity (philosophy), media_common
Published
2013
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154. Does country context matter? Investigating the predictors of teen sexting across Europe

Author

Baumgartner, S., Sumter, S., Peter, J., Livingstone, S., and Youth & Media Entertainment (ASCoR, FMG)

Abstract

The aim of this study was (a) to investigate which individual and country characteristics explain why adolescents engage in sexting and (b) whether individual predictors vary across countries. On the individual level, we investigated age, gender, sensation seeking, and frequency of internet use. On the country level, we investigated traditionalism, gross domestic product, and broadband penetration. The sample consisted of 14,946 adolescents (49.7% boys) aged 11 to 16 from 20 European countries. Using multilevel modeling, our findings indicate that age, sensation seeking, and frequency of internet use predicted sexting across all countries. The influence of gender varied across countries. Although country characteristics had no direct effect on adolescent sexting, traditionalism significantly predicted gender differences in sexting. In more traditional countries, gender differences were stronger with more boys than girls engaging in this behavior. In less traditional countries, these gender differences were less apparent or even reversed.

Published
2013

156. TanDEM-X Experiments in Pursuit Monostatic Configuration

Author

Prats, P., Scheiber, R., Mittermayer, J., Wollstadt, S., Baumgartner, S. V., Paco Lopez Dekker, Schulze, D., Steinbrecher, U., Rodríguez-Cassolà, M., Reigber, A., Krieger, G., Zink, M., and Moreira, A.

Subjects
Satelliten-SAR-Systeme, TanDEM-X, Institut für Hochfrequenztechnik und Radarsysteme, Radarkonzepte, SAR-Technologie, SAR
Abstract

This paper reports on several experiments performed by the TanDEM-X constellation that could be potentially implemented as operational modes in future SAR missions. Many of them have been already demonstrated ex-perimentally and could be repeated during a possible next pursuit monostatic phase with TanDEM-X. The new modes include new single-look products as well as interferometric ones, some of which are included in this paper as an example of their potential performance.

Published
2012

157. The development of adolescents’ online sexual risk behavior and its relationship to negative online experiences

Author

Baumgartner, S., Sumter, S., Valkenburg, P., Peter, J., and ASCoR (FMG)

Abstract

The aim of this study was to investigate developmental pathways of online sexual risk behavior from early to late adolescence. Moreover, this study examined how these trajectories are related to negative online experiences, such as online sexual solicitation, online harassment, and online rumination. A four-wave longitudinal study with a representative sample of 1,762 Dutch adolescents aged 12 to 17 was conducted. Group-based modeling revealed three distinct developmental pathways. One group of adolescents showed no online sexual risk behavior during adolescence, a second group showed low levels and the third group high levels of online sexual risk behavior. The high online risk group followed the typical adolescence-limited developmental pathway with a peak in risk engagement in mid-adolescence. Further analyses suggested that engagement in online sexual risk behaviors is related to three types of negative online experiences: online sexual solicitation, online harassment, and online rumination.

Published
2012

158. Developmental trajectories of peer victimization: offline and online experiences during adolescence

Author

Sumter, S., Baumgartner, S., Valkenburg, P., Peter, J., van der Hof, S., and ASCoR (FMG)

Subjects
education, behavior and behavior mechanisms, social sciences, humanities, health care economics and organizations
Abstract

This study investigated the development and consequences of offline and online peer victimization during adolescence. We examined the number of victimization trajectories, the relationship between trajectories, and their effect on life-satisfaction. A four-wave panel study with 6-month time intervals was conducted among a sample of adolescents aged 12-to-17-years (N = 1,762). Three offline victimization trajectories could be distinguished: a trajectory group of low to no victimization, a group of moderate victimization, and a group of high victimization across adolescence. Two groups in online victimization could be distinguished: a group of low to no and a group of moderate victimization which peaked at age 14. Dual-trajectory analyses revealed a substantial overlap between offline and online victimization. Finally, victimization and life-satisfaction were longitudinally related.The overlap between the offline and online victimization trajectories and their negative consequences on life-satisfaction suggest that prevention of peer victimization should focus on both types of victimization.

Published
2012

159. Progress and prospective of plant sterol and plant stanol research: Report of the Maastricht meeting

Author

Mackay D., Clifton P.M., Jones P.J.H., Awad A., Chapman J., Baker P.C., Gylling H., Jones P., Lutjohann D., Marz W., Moreau B., Ostlund R., Plat J., Rideout T., Ros E., Schaefer E., Daniel T., Vartiainen E., Weingartner O., Zampelas A., Berger A., Wester I., Rosin S., Meijer G., Trautwein E., Ras R., Antoine J.-M., Jeansen S., Koutnikova H., Short C., Messinger H., Horlacher P., Ehrhardt C., Brañes C., Harting T., Thompson G., Tikkanen M., Shaghaghi M.A., Baer D., Ansorena D., Baumgartner S., Blanco-Vaca F., Ellegard L., Carles J., Laitinen K., Myrie S., Miettinen T., Mymin D., Robinson M., Rompelberg C., Sarkkinen E., Silbernagel G., de Smet E., and Loman S.

Subjects
phytosterol, food intake, nonhuman, concentration (parameters), consensus development, antineoplastic activity, stanozolol, low density lipoprotein cholesterol, unclassified drug, drug efficacy, drug formulation, priority journal, plant stanol, lipid metabolism, human, Alzheimer disease, atherosclerosis, antilipemic agent, antineoplastic agent, conference paper, Netherlands
Abstract

Abundant evidence over past decades shows that foods with added plant sterols and plant stanols lower serum LDL cholesterol concentrations. However, despite the overwhelming data, numerous scientific questions still remain. The objective of this paper is to summarize the considerations of 60 academic and industrial experts who participated in the scientific meeting in Maastricht, the Netherlands, on issues related to the health effects of plant sterols and plant stanols. The meeting participants discussed issues including efficacy profiling, heterogeneity in responsiveness, effects beyond LDL-C lowering, and food formulation aspects of plant sterol and stanol consumption. Furthermore, aspects related to the potential atherogenicity of elevated circulatory plant sterol concentrations were discussed. Until the potential atherogenicity of plant sterols is resolved, based on the results >200 clinical trials, the risk to benefit of plant sterol use is favorable. Evidence on these topics in plant sterol and plant stanol research was presented and used to reach consensus where possible. It was concluded that endpoint studies looking at plant sterol and plant stanol efficacy are needed, however, there was no clear opinion on the best marker and best design for such a study. Based on the current scientific evidence, plant sterols and plant stanols are recommended for use as dietary options to lower serum cholesterol. © 2012.

Published
2012

167. FRI0333 Lesinurad, a Selective Uric Acid Reabsorption Inhibitor, in Combination with Allopurinol: Results from a Phase III Study in Gout Patients Having an Inadequate Response to Standard of Care (Clear 2)

Author

Bardin, T., primary, Keenan, R., additional, Khanna, P., additional, Kopicko, J., additional, Fung, M., additional, Bhakta, N., additional, Adler, S., additional, Storgard, C., additional, Baumgartner, S., additional, and So, A., additional

Published
2015
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172. Die Verzauberung der Zeit in die Zeitung. Karl Kraus' grosser Mann im Weltkrieg

Author

Wagner, Karl, Baumgartner, Stephan, Gamper, Michael, Wagner, K ( Karl ), Baumgartner, S ( Stephan ), Gamper, M ( Michael ), Van der Steeg, Christian, Wagner, Karl, Baumgartner, Stephan, Gamper, Michael, Wagner, K ( Karl ), Baumgartner, S ( Stephan ), Gamper, M ( Michael ), and Van der Steeg, Christian

Published
2014

177. Hollywood und der Erste Weltkrieg: Eine Frage der imaginären Annäherung

Author

Wagner, Karl, Baumgartner, Stephan, Gamper, Michael, Wagner, K ( Karl ), Baumgartner, S ( Stephan ), Gamper, M ( Michael ), Bronfen, Elisabeth, Wagner, Karl, Baumgartner, Stephan, Gamper, Michael, Wagner, K ( Karl ), Baumgartner, S ( Stephan ), Gamper, M ( Michael ), and Bronfen, Elisabeth

Published
2014

178. The Prototype Synchrotron Radiation Detector (PSRD)

Author

Anderhub, H, Baetzner, D, Baumgartner, S, Biland, A, Camps, C, Capell, M, Commichau, V, Djambazov, L, Fanchiang, Y.-J, Fluegge, G, Grimm, O, Hangarter, K, Hofer, H, Kan, R, Kenney, G, Koutsenko, V, Kraeber, M, Kuipers, J, Lebedev, A, Lee, S.-C, Ren, D, Ren, Z.L, Roeser, U, Ting, Samuel C.C, Tiwari, A, Viertel, G.M, von Gunten, H.P, Waldmeier Wicki, S, Wang, T.-S, and Zimmermann, B

Published
2002
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180. Geometric, Radiometric, Polarimetric and Along-Track Interferometric Calibration of the new F-SAR System of DLR in X-Band

Author

Jens Fischer, Baumgartner, S., Reigber, A., Horn, R., Nottensteiner, A., and Scheiber, R.

Subjects
airborne, ATI, interferometry, Institut für Hochfrequenztechnik und Radarsysteme, calibration, radiometric, sensor, geometric, polarimetric, Radarkonzepte, SAR-Technologie, SAR, along-track-interferometric, polarimetry
Abstract

Since November 2006, DLR operates F-SAR - a new airborne SAR sensor beside its experimental airborne SAR sensor E-SAR. F-SAR is a totally new development utilizing most modern hardware. It is presently operated in X-band and has been supplemented recently being fully polarimetric. F-SAR already accomplished several flights and acquired SAR data in different operation modes, amongst others in along-track-interferometric and full polarimetric mode. Several data takes were acquired at the Kaufbeuren calibration site where eleven permanently deployed corner reflectors are used for calibration. The paper describes the X-band subsystem calibration of F-SAR in geometric, radiometric and polarimetric terms and for along-track interferometry.

Published
2008

181. Inclusive D*± meson cross sections and D*±-jet correlations in photoproduction at HERA

Author

H1 Collaboration, Aktas, A., Baumgartner, S., Berger, N., Del Degan, Marc, Grab, Christophorus, Leibenguth, Guillaume, Sauter, M., Schöning, A., Weber, R., and Zimmermann, T.

Subjects
Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Differential photoproduction cross sections are measured for events containing D*± mesons. The data were taken with the H1 detector at the ep collider HERA and correspond to an integrated luminosity of 51.1 pb-1. The kinematic region covers small photon virtualities Q2 < 0.01 GeV2 and photon–proton centre-of-mass energies of 171 < Wγ p < 256 GeV. The details of the heavy quark production process are further investigated in events with one or two jets in addition to the D*± meson. Differential cross sections for D*+jet production are determined and the correlations between the D*± meson and the jet(s) are studied. The results are compared with perturbative QCD predictions applying collinear- or kt-factorisation., The European Physical Journal C, 50 (2), ISSN:1434-6044, ISSN:1434-6052

Published
2007

182. Production of $D^{*\pm}$ Mesons with Dijets in Deep-Inelastic Scattering at HERA

Author

Aktas, A., Andreev, V., Anthonis, T., Antunovic, B., Aplin, S., Asmone, A., Astvatsatourov, A., Babaev, A., Backovic, S., Baghdasaryan, A., Baranov, P., Barrelet, E., Bartel, W., Baudrand, S., Baumgartner, S., Beckingham, M., Behnke, O., Behrendt, O., Belousov, A., Berger, N., Bizot, J.C., Boenig, M.-O., Boudry, V., Bracinik, J., Brandt, G., Brisson, V., Bruncko, D., Busser, F.W., Bunyatyan, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Cassol-Brunner, F., Cerny, K., Cerny, V., Chekelian, V., Contreras, J.G., Coughlan, J.A., Coppens, Y.R., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., de Boer, Y., Delcourt, B., del Degan, M., de Roeck, A., de Wolf, E.A., Diaconu, C., Dodonov, V., Dubak, A., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eliseev, A., Elsen, E., Essenov, S., Falkewicz, A., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Finke, L., Fleischer, M., Flucke, G., Fomenko, A., Franke, G., Frisson, T., Gabathuler, E., Garutti, E., Gayler, J., Gerlich, C., Ghazaryan, S., Ginzburgskaya, S., Glazov, A., Glushkov, I., Goerlich, L., Goettlich, M., Gogitidze, N., Gorbounov, S., Grab, C., Greenshaw, T., Gregori, M., Grell, B.R., Grindhammer, G., Gwilliam, C., Haidt, D., Hansson, M., Heinzelmann, G., Henderson, R.C.W., Henschel, H., Herrera, G., Hildebrandt, M., Hiller, K.H., Hoffmann, D., Horisberger, R., Hovhannisyan, A., Hreus, T., Hussain, S., Ibbotson, M., Ismail, M., Jacquet, M., Janssen, X., Jemanov, V., Jönsson, L., Johnson, C.L., Johnson, D.P., Jung, A.W., Jung, H., Kapichine, M., Katzy, J., Kenyon, I.R., Kiesling, C., Klein, M., Kleinwort, C., Klimkovich, T., Kluge, T., Knies, G., Knutsson, A., Korbel, V., Kostka, P., Krastev, K., Kretzschmar, J., Kropivnitskaya, A., Kruger, K., Landon, M.P.J., Lange, W., Lastovicka-Medin, G., Laycock, P., Lebedev, A., Leibenguth, G., Lendermann, V., Levonian, S., Lindfeld, L., Lipka, K., Liptaj, A., List, B., List, J., Lobodzinska, E., Loktionova, N., Lopez-Fernandez, R., Lubimov, V., Lucaci-Timoce, A.-I., Lueders, H., Lux, T., Lytkin, L., Makankine, A., Malden, N., Malinovski, E., Marage, P., Marshall, R., Marti, L., Martisikova, M., Martyn, H.-U., Maxfield, S.J., Mehta, A., Meier, K., Meyer, A.B., Meyer, H., Meyer, J., Michels, V., Mikocki, S., Milcewicz-Mika, I., Milstead, D., Mladenov, D., Mohamed, A., Moreau, F., Morozov, A., Morris, J.V., Mozer, M.U., Muller, K., Murin, P., Nankov, K., Naroska, B., Naumann, T., Newman, P.R., Niebuhr, C., Nikiforov, A., Nowak, G., Nowak, K., Nozicka, M., Oganezov, R., Olivier, B., Olsson, J.E., Osman, S., Ozerov, D., Palichik, V., Panagoulias, I., Papadopoulou, T., Pascaud, C., Patel, G.D., Peng, H., Perez, Emile, Perez-Astudillo, D., Perieanu, A., Petrukhin, A., Pitzl, D., Placakyte, R., Portheault, B., Povh, B., Prideaux, P., Rahmat, A.J., Raicevic, N., Reimer, P., Rimmer, A., Risler, C., Rizvi, E., Robmann, P., Roland, B., Roosen, R., Rostovtsev, A., Rurikova, Z., Rusakov, S., Salvaire, F., Sankey, D.P.C., Sauter, M., Sauvan, E., Sch¨atzel, S., Schilling, F.-P., Schmidt, S., Schmitt, S., Schmitz, C., Schoeffel, L., Schoning, A., Schultz-Coulon, H.-C., Sefkow, F., Shaw-West, R.N., Sheviakov, I., Shtarkov, L.N., Sloan, T., Smirnov, P., Soloviev, Y., South, D., Spaskov, V., Specka, A., Steder, M., Stella, B., Stiewe, J., Stoilov, A., Straumann, U., Sunar, D., Tchoulakov, V., Thompson, G., Thompson, P.D., Toll, T., Tomasz, F., Traynor, D., Trinh, T.N., Truol, P., Tsakov, I., Tsipolitis, G., Tsurin, I., Turnau, J., Tzamariudaki, E., Urban, K., Urban, Martin, Usik, A., Utkin, D., Valkarova, A., Vallee, C., van Mechelen, P., Vargas Trevino, A., Vazdik, Y., Veelken, C., Vinokurova, S., Volchinski, V., Wacker, K., Weber, G., Weber, R., Wegener, D., Werner, C., Wessels, M., Wessling, B., Wissing, C., Wolf, R., Wünsch, E., Xella, S., Yan, W., Yeganov, V., Zacek, J., Zalesak, J., Zhang, Zhiqing, Zhelezov, A., Zhokin, A., Zhu, Y.C., Zimmermann, J., Zimmermann, T., Zohrabyan, H., Zomer, F., Gouzevitch, M., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), H1, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics - Experiment (hep-ex), High Energy Physics::Phenomenology, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, ddc:530, High Energy Physics::Experiment, Nuclear Experiment, High Energy Physics - Experiment
Abstract

Inclusive D* production is measured in deep-inelastic ep scattering at HERA with the H1 detector. In addition, the production of dijets in events with a D* meson is investigated. The analysis covers values of photon virtuality 2< Q^2, 31 pages, 7 figures

Published
2007
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183. First Results of the Third Level of the H1 Fast Track Trigger

Author

Jung, A. W., Baird, A., Baldinger, R., Baumgartner, S., Beneckenstein, D., Berger, N., Boenig, M.-O., Caminada, L., Dodt, D., Elsen, E., Kolander, M., Kolya, S., Krüger, K., Lohwasser, K., Meer, D., Mercer, D., Michels, V., Müller, D., Müller, J., Naumann, J., Newman, P. R., Sankey, D., Sauter, M., Schöning, A., Schultz-Coulon, H.-C., Wessels, M., Wissing, Ch., and Yan, W.

Published
2007

185. Photoproduction of Dijets with High Transverse Momenta at HERA

Author

Aktas, A., Andreev, V., Anthonis, T., Aplin, S., Asmone, A., Astvatsatourov, A., Babaev, A., Backovic, S., Bahr, J., Baghdasaryan, A., Baranov, P., Barrelet, E., Bartel, W., Baudrand, S., Baumgartner, S., Becker, J., Beckingham, M., Behnke, O., Behrendt, O., Belousov, A., Berger, Ch., Berger, N., Bizot, J.C., Boenig, M.-O., Boudry, V., Bracinik, J., Brandt, G., Brisson, V., Brown, D.P., Bruncko, D., Busser, F.W., Bunyatyan, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Caron, S., Cassol-Brunner, F., Cerny, K., Cerny, V., Chekelian, V., Contreras, J.G., Coughlan, J.A., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., de Boer, Y., Delcourt, B., de Roeck, A., Desch, K., de Wolf, E.A., Diaconu, C., Dodonov, V., Dubak, A., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Ellerbrock, M., Erdmann, W., Essenov, S., Falkewicz, A., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Finke, L., Fleischer, M., Fleischmann, P., Fleming, Y.H., Flucke, G., Fomenko, A., Foresti, I., Franke, G., Frisson, T., Gabathuler, E., Garutti, E., Gayler, J., Gerlich, C., Ghazaryan, S., Ginzburgskaya, S., Glazov, A., Glushkov, I., Goerlich, L., Goettlich, M., Gogitidze, N., Gorbounov, S., Goyon, C., Grab, C., Greenshaw, T., Gregori, M., Grell, B.R., Grindhammer, G., Gwilliam, C., Haidt, D., Hajduk, L., Hansson, M., Heinzelmann, G., Henderson, R.C.W., Henschel, H., Henshaw, O., Herrera, G., Hildebrandt, M., Hiller, K.H., Hoffmann, D., Horisberger, R., Hovhannisyan, A., Hreus, T., Hussain, S., Ibbotson, M., Ismail, M., Jacquet, M., Janauschek, L., Janssen, X., Jemanov, V., Jonsson, L., Johnson, D.P., Jung, A.W., Jung, H., Kapichine, M., Katzy, J., Keller, N., Kenyon, I.R., Kiesling, C., Klein, M., Kleinwort, C., Klimkovich, T., Kluge, T., Knies, G., Knutsson, A., Korbel, V., Kostka, P., Krastev, K., Kretzschmar, J., Kropivnitskaya, A., Kruger, K., Kuckens, J., Landon, M.P.J., Lange, W., Lastovicka, T., Lastovicka-Medin, G., Laycock, P., Lebedev, A., Leibenguth, G., Lendermann, V., Levonian, S., Lindfeld, L., Lipka, K., Liptaj, A., List, B., Lobodzinska, E., Loktionova, N., Lopez-Fernandez, R., Lubimov, V., Lucaci-Timoce, A.-I., Lueders, H., Luke, D., Lux, T., Lytkin, L., Makankine, A., Malden, N., Malinovski, E., Mangano, S., Marage, P., Marshall, R., Martisikova, M., Martyn, H.-U., Maxfield, S.J., Meer, D., Mehta, A., Meier, K., Meyer, A.B., Meyer, H., Meyer, J., Mikocki, S., Milcewicz-Mika, I., Milstead, D., Mladenov, D., Mohamed, A., Moreau, F., Morozov, A., Morris, J.V., Mozer, M.U., Muller, K., Murin, P., Nankov, K., Naroska, B., Naumann, T., Newman, P.R., Niebuhr, C., Nikiforov, A., Nikitin, D., Nowak, G., Nozicka, M., Oganezov, R., Olivier, B., Olsson, J.E., Osman, S., Ozerov, D., Palichik, V., Panagoulias, I., Papadopoulou, T., Pascaud, C., Patel, G.D., Peez, M., Perez, Emile, Perez-Astudillo, D., Perieanu, A., Petrukhin, A., Pitzl, D., Placakyte, R., Portheault, B., Povh, B., Prideaux, P., Raicevic, N., Reimer, P., Rimmer, A., Risler, C., Rizvi, E., Robmann, P., Roland, B., Roosen, R., Rostovtsev, A., Rurikova, Z., Rusakov, S., Salvaire, F., Sankey, D.P.C., Sauvan, E., Schätzel, S., Schilling, F.-P., Schmidt, S., Schmitt, S., Schmitz, C., Schoeffel, L., Schoning, A., Schultz-Coulon, H.-C., Sedlak, K., Sefkow, F., Shaw-West, R.N., Sheviakov, I., Shtarkov, L.N., Sloan, T., Smirnov, P., Soloviev, Y., South, D., Spaskov, V., Specka, A., Stella, B., Stiewe, J., Strauch, I., Straumann, U., Tchoulakov, V., Thompson, G., Thompson, P.D., Tomasz, F., Traynor, D., Truol, P., Tsakov, I., Tsipolitis, G., Tsurin, I., Turnau, J., Tzamariudaki, E., Urban, Martin, Usik, A., Utkin, D., Valkar, S., Valkarova, A., Vallee, C., van Mechelen, P., Vargas Trevino, A., Vazdik, Y., Veelken, C., Vest, A., Vinokurova, S., Volchinski, V., Vujicic, B., Wacker, K., Wagner, J., Weber, G., Weber, R., Wegener, D., Werner, C., Werner, N., Wessels, M., Wessling, B., Wigmore, C., Wissing, C., Wolf, R., Wunsch, E., Xella, S., Yan, W., Yeganov, V., Zacek, J., Zalesak, J., Zhang, Z., Zhelezov, A., Zhokin, A., Zhu, Y.C., Zimmermann, J., Zimmermann, T., Zohrabyan, H., Zomer, F., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, FOS: Physical sciences, Parton, Jet (particle physics), 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, law.invention, Nuclear physics, Momentum, High Energy Physics - Experiment (hep-ex), law, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, 010306 general physics, Collider, Nuclear Experiment, Quantum chromodynamics, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, HERA, High Energy Physics::Experiment
Abstract

Differential dijet cross sections are measured in photoproduction in the region of photon virtualities Q^2 < 1 GeV^2 with the H1 detector at the HERA ep collider using an integrated luminosity of 66.6 pb^{-1}. Jets are defined with the inclusive k_T algorithm and a minimum transverse momentum of the leading jet of 25 GeV is required. Dijet cross sections are measured in direct and resolved photon enhanced regions separately. Longitudinal proton momentum fractions up to 0.7 are reached. The data compare well with predictions from Monte Carlo event generators based on leading order QCD and parton showers and with next-to-leading order QCD calculations corrected for hadronisation effects., 18 pages, 5 figures, 5 tables

Published
2006
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186. Tau Lepton Production in $ep$ Collisions at HERA

Author

Aktas, A., Andreev, V., Anthonis, T., Aplin, S., Asmone, A., Astvatsatourov, A., Babaev, A., Backovic, S., Bahr, J., Baghdasaryan, A., Baranov, P., Barrelet, E., Bartel, W., Baudrand, S., Baumgartner, S., Becker, J., Beckingham, M., Behnke, O., Behrendt, O., Belousov, A., Berger, Ch., Berger, N., Bizot, J.C., Boenig, M.-O., Boudry, V., Bracinik, J., Brandt, G., Brisson, V., Brown, D.P., Bruncko, D., Busser, F.W., Bunyatyan, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Caron, S., Cassol-Brunner, F., Cerny, K., Cerny, V., Chekelian, V., Contreras, J.G., Coughlan, J.A., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., De Boer, Y., Delcourt, B., De Roeck, A., Desch, K., De Wolf, E.A., Diaconu, C., Dodonov, V., Dubak, A., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Ellerbrock, M., Erdmann, W., Essenov, S., Falkewicz, A., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Finke, L., Fleischer, M., Fleischmann, P., Fleming, Y.H., Flucke, G., Fomenko, A., Foresti, I., Franke, G., Frisson, T., Gabathuler, E., Garutti, E., Gayler, J., Gerlich, C., Ghazaryan, S., Ginzburgskaya, S., Glazov, A., Glushkov, I., Goerlich, L., Goettlich, M., Gogitidze, N., Gorbounov, S., Goyon, C., Grab, C., Greenshaw, T., Gregori, M., Grell, B.R., Grindhammer, G., Gwilliam, C., Haidt, D., Hajduk, L., Hansson, M., Heinzelmann, G., Henderson, R.C.W., Henschel, H., Henshaw, O., Herrera, G., Hildebrandt, M., Hiller, K.H., Hoffmann, D., Horisberger, R., Hovhannisyan, A., Hreus, T., Hussain, S., Ibbotson, M., Ismail, M., Jacquet, M., Janauschek, L., Janssen, X., Jemanov, V., Jonsson, L., Johnson, D.P., Jung, A.W., Jung, H., Kapichine, M., Katzy, J., Keller, N., Kenyon, I.R., Kiesling, C., Klein, M., Kleinwort, C., Klimkovich, T., Kluge, T., Knies, G., Knutsson, A., Korbel, V., Kostka, P., Krastev, K., Kretzschmar, J., Kropivnitskaya, A., Kruger, K., Kuckens, J., Landon, M.P.J., Lange, W., Lastovicka, T., Lastovicka-Medin, G., Laycock, P., Lebedev, A., Leibenguth, G., Lendermann, V., Levonian, S., Lindfeld, L., Lipka, K., Liptaj, A., List, B., Lobodzinska, E., Loktionova, N., Lopez-Fernandez, R., Lubimov, V., Lucaci-Timoce, A.-I., Lueders, H., Luke, D., Lux, T., Lytkin, L., Makankine, A., Malden, N., Malinovski, E., Mangano, S., Marage, P., Marshall, R., Martisikova, M., Martyn, H.-U., Maxfield, S.J., Meer, D., Mehta, A., Meier, K., Meyer, A.B., Meyer, H., Meyer, J., Mikocki, S., Milcewicz-Mika, I., Milstead, D., Mladenov, D., Mohamed, A., Moreau, F., Morozov, A., Morris, J.V., Mozer, M.U., Muller, K., Murin, P., Nankov, K., Naroska, B., Naumann, T., Newman, P.R., Niebuhr, C., Nikiforov, A., Nikitin, D., Nowak, G., Nozicka, M., Oganezov, R., Olivier, B., Olsson, J.E., Osman, S., Ozerov, D., Palichik, V., Panagoulias, I., Papadopoulou, T., Pascaud, C., Patel, G.D., Peez, M., Perez, Emile, Perez-Astudillo, D., Perieanu, A., Petrukhin, A., Pitzl, D., Placakyte, R., Portheault, B., Povh, B., Prideaux, P., Raicevic, N., Reimer, P., Rimmer, A., Risler, C., Rizvi, E., Robmann, P., Roland, B., Roosen, R., Rostovtsev, A., Rurikova, Z., Rusakov, S., Salvaire, F., Sankey, D.P.C., Sauvan, E., Schätzel, S., Schilling, F.-P., Schmidt, S., Schmitt, S., Schmitz, C., Schoeffel, L., Schoning, A., Schultz-Coulon, H.-C., Sedlak, K., Sefkow, F., Shaw-West, R.N., Sheviakov, I., Shtarkov, L.N., Sloan, T., Smirnov, P., Soloviev, Y., South, D., Spaskov, V., Specka, A., Stella, B., Stiewe, J., Strauch, I., Straumann, U., Tchoulakov, V., Thompson, G., Thompson, P.D., Tomasz, F., Traynor, D., Truol, P., Tsakov, I., Tsipolitis, G., Tsurin, I., Turnau, J., Tzamariudaki, E., Urban, Martin, Usik, A., Utkin, D., Valkar, S., Valkarova, A., Vallee, C., Van Mechelen, P., Vargas Trevino, A., Vazdik, Y., Veelken, C., Vest, A., Vinokurova, S., Volchinski, V., Vujicic, B., Wacker, K., Wagner, J., Weber, G., Weber, R., Wegener, D., Werner, C., Werner, N., Wessels, M., Wessling, B., Wigmore, C., Wissing, C., Wolf, R., Wunsch, E., Xella, S., Yan, W., Yeganov, V., Zacek, J., Zalesak, J., Zhang, Zhiqing, Zhelezov, A., Zhokin, A., Zhu, Y.C., Zimmermann, J., Zimmermann, T., Zohrabyan, H., Zomer, F., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and H1 Collaboration

Subjects
Physics, Hadronic decay, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, HERA, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Standard Model (mathematical formulation), 0103 physical sciences, Transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, High Energy Physics::Experiment, 010306 general physics, Engineering (miscellaneous), Lepton
Abstract

The production of tau leptons in ep collisions is investigated using data recorded by the H1 detector at HERA in the period 1994-2000. Tau leptons are identified by detecting their decay products, using leptonic and hadronic decay modes. The cross section for the production of tau lepton pairs is measured for the first time at HERA. Furthermore, a search for events with an energetic isolated tau lepton and with large missing transverse momentum is performed. The results are found to be in agreement with the Standard Model predictions., Comment: 28 pages, 6 figures, 6 tables

Published
2006
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187. Search for a Narrow Baryonic Resonance Decaying to $K^0_s p$ or $K^0_s \bar{p}$ in Deep Inelastic Scattering at HERA

Author

Aktas, A., Andreev, V., Anthonis, T., Aplin, S., Asmone, A., Astvatsatourov, A., Babaev, A., Backovic, S., Bahr, J., Baghdasaryan, A., Baranov, P., Barrelet, E., Bartel, W., Baudrand, S., Baumgartner, S., Becker, J., Beckingham, M., Behnke, O., Behrendt, O., Belousov, A., Berger, Ch., Berger, N., Bizot, J.C., Boenig, M.-O., Boudry, V., Bracinik, J., Brandt, G., Brisson, V., Brown, D.P., Bruncko, D., Busser, F.W., Bunyatyan, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Caron, S., Cassol-Brunner, F., Cerny, K., Cerny, V., Chekelian, V., Contreras, J.G., Coughlan, J.A., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., de Boer, Y., Delcourt, B., de Roeck, A., Desch, K., de Wolf, E.A., Diaconu, C., Dodonov, V., Dubak, A., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Ellerbrock, M., Erdmann, W., Essenov, S., Falkewicz, A., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Finke, L., Fleischer, M., Fleischmann, P., Fleming, Y.H., Flucke, G., Fomenko, A., Foresti, I., Franke, G., Frisson, T., Gabathuler, E., Garutti, E., Gayler, J., Gerlich, C., Ghazaryan, S., Ginzburgskaya, S., Glazov, A., Glushkov, I., Goerlich, L., Goettlich, M., Gogitidze, N., Gorbounov, S., Goyon, C., Grab, C., Greenshaw, T., Gregori, M., Grell, B.R., Grindhammer, G., Gwilliam, C., Haidt, D., Hajduk, L., Hansson, M., Heinzelmann, G., Henderson, R.C.W., Henschel, H., Henshaw, O., Herrera, G., Hildebrandt, M., Hiller, K.H., Hoffmann, D., Horisberger, R., Hovhannisyan, A., Hreus, T., Hussain, S., Ibbotson, M., Ismail, M., Jacquet, M., Janauschek, L., Janssen, X., Jemanov, V., Jonsson, L., Johnson, D.P., Jung, A.W., Jung, H., Kapichine, M., Katzy, J., Keller, N., Kenyon, I.R., Kiesling, C., Klein, M., Kleinwort, C., Klimkovich, T., Kluge, T., Knies, G., Knutsson, A., Korbel, V., Kostka, P., Krastev, K., Kretzschmar, J., Kropivnitskaya, A., Kruger, K., Kuckens, J., Landon, M.P.J., Lange, W., Lastovicka, T., Lastovicka-Medin, G., Laycock, P., Lebedev, A., Leibenguth, G., Lendermann, V., Levonian, S., Lindfeld, L., Lipka, K., Liptaj, A., List, B., Lobodzinska, E., Loktionova, N., Lopez-Fernandez, R., Lubimov, V., Lucaci-Timoce, A.-I., Lueders, H., Luke, D., Lux, T., Lytkin, L., Makankine, A., Malden, N., Malinovski, E., Mangano, S., Marage, P., Marshall, R., Martisikova, M., Martyn, H.-U., Maxfield, S.J., Meer, D., Mehta, A., Meier, K., Meyer, A.B., Meyer, H., Meyer, J., Mikocki, S., Milcewicz-Mika, I., Milstead, D., Mladenov, D., Mohamed, A., Moreau, F., Morozov, A., Morris, J.V., Mozer, M.U., Muller, K., Murin, P., Nankov, K., Naroska, B., Naumann, T., Newman, P.R., Niebuhr, C., Nikiforov, A., Nikitin, D., Nowak, G., Nozicka, M., Oganezov, R., Olivier, B., Olsson, J.E., Osman, S., Ozerov, D., Palichik, V., Panagoulias, I., Papadopoulou, T., Pascaud, C., Patel, G.D., Peez, M., Perez, Emile, Perez-Astudillo, D., Perieanu, A., Petrukhin, A., Pitzl, D., Placakyte, R., Portheault, B., Povh, B., Prideaux, P., Raicevic, N., Reimer, P., Rimmer, A., Risler, C., Rizvi, E., Robmann, P., Roland, B., Roosen, R., Rostovtsev, A., Rurikova, Z., Rusakov, S., Salvaire, F., Sankey, D.P.C., Sauvan, E., Schätzel, S., Schilling, F.-P., Schmidt, S., Schmitt, S., Schmitz, C., Schoeffel, L., Schoning, A., Schultz-Coulon, H.-C., Sedlak, K., Sefkow, F., Shaw-West, R.N., Sheviakov, I., Shtarkov, L.N., Sloan, T., Smirnov, P., Soloviev, Y., South, D., Spaskov, V., Specka, A., Stella, B., Stiewe, J., Strauch, I., Straumann, U., Tchoulakov, V., Thompson, G., Thompson, P.D., Tomasz, F., Traynor, D., Truol, P., Tsakov, I., Tsipolitis, G., Tsurin, I., Turnau, J., Tzamariudaki, E., Urban, Martin, Usik, A., Utkin, D., Valkar, S., Valkarova, A., Vallee, C., van Mechelen, P., Vargas Trevino, A., Vazdik, Y., Veelken, C., Vest, A., Vinokurova, S., Volchinski, V., Vujicic, B., Wacker, K., Wagner, J., Weber, G., Weber, R., Wegener, D., Werner, C., Werner, N., Wessels, M., Wessling, B., Wigmore, C., Wissing, C., Wolf, R., Wunsch, E., Xella, S., Yan, W., Yeganov, V., Zacek, J., Zalesak, J., Zhang, Zhiqing, Zhelezov, A., Zhokin, A., Zhu, Y.C., Zimmermann, J., Zimmermann, T., Zohrabyan, H., Zomer, F., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, High Energy Physics::Experiment, High Energy Physics - Experiment
Abstract

A search for a narrow baryonic resonance decaying to $K^0_s p$ or $K^0_s \bar p$ is carried out in deep inelastic ep scattering with the H1 detector at HERA. Such a resonance could be a strange pentaquark \thplns, evidence for which has been reported by several experiments. The $K^0_s p$ and $K^0_s \bar p$ invariant mass distributions presented here do not show any significant peak in the mass range from threshold up to 1.7 GeV. Mass dependent upper limits on $\sigma(ep \to e \thplf X)\times BR(\thplf \to K^0 p)$ are obtained at the 95% confidence level., Comment: 13 pages, 4 figures

Published
2006
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188. Search for Doubly-Charged Higgs Boson Production at HERA

Author

Aktas, A., Andreev, V., Anthonis, T., Aplin, S., Asmone, A., Astvatsatourov, A., Babaev, A., Backovic, S., Bahr, J., Baghdasaryan, A., Baranov, P., Barrelet, E., Bartel, W., Baudrand, S., Baumgartner, S., Becker, J., Beckingham, M., Behnke, O., Behrendt, O., Belousov, A., Berger, Ch., Berger, N., Bizot, J.C., Boenig, M.-O., Boudry, V., Bracinik, J., Brandt, G., Brisson, V., Brown, D.P., Bruncko, D., Busser, F.W., Bunyatyan, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Caron, S., Cassol-Brunner, F., Cerny, K., Cerny, V., Chekelian, V., Contreras, J.G., Coughlan, J.A., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., De Boer, Y., Delcourt, B., De Roeck, A., Desch, K., De Wolf, E.A., Diaconu, C., Dodonov, V., Dubak, A., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Ellerbrock, M., Erdmann, W., Essenov, S., Falkewicz, A., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Finke, L., Fleischer, M., Fleischmann, P., Fleming, Y.H., Flucke, G., Fomenko, A., Foresti, I., Franke, G., Frisson, T., Gabathuler, E., Garutti, E., Gayler, J., Gerlich, C., Ghazaryan, S., Ginzburgskaya, S., Glazov, A., Glushkov, I., Goerlich, L., Goettlich, M., Gogitidze, N., Gorbounov, S., Goyon, C., Grab, C., Greenshaw, T., Gregori, M., Grell, B.R., Grindhammer, G., Gwilliam, C., Haidt, D., Hajduk, L., Hansson, M., Heinzelmann, G., Henderson, R.C.W., Henschel, H., Henshaw, O., Herrera, G., Hildebrandt, M., Hiller, K.H., Hoffmann, D., Horisberger, R., Hovhannisyan, A., Hreus, T., Hussain, S., Ibbotson, M., Ismail, M., Jacquet, M., Janauschek, L., Janssen, X., Jemanov, V., Jonsson, L., Johnson, D.P., Jung, A.W., Jung, H., Kapichine, M., Katzy, J., Keller, N., Kenyon, I.R., Kiesling, C., Klein, M., Kleinwort, C., Klimkovich, T., Kluge, T., Knies, G., Knutsson, A., Korbel, V., Kostka, P., Krastev, K., Kretzschmar, J., Kropivnitskaya, A., Kruger, K., Kuckens, J., Landon, M.P.J., Lange, W., Lastovicka, T., Lastovicka-Medin, G., Laycock, P., Lebedev, A., Leibenguth, G., Lendermann, V., Levonian, S., Lindfeld, L., Lipka, K., Liptaj, A., List, B., Lobodzinska, E., Loktionova, N., Lopez-Fernandez, R., Lubimov, V., Lucaci-Timoce, A.-I., Lueders, H., Luke, D., Lux, T., Lytkin, L., Makankine, A., Malden, N., Malinovski, E., Mangano, S., Marage, P., Marshall, R., Martisikova, M., Martyn, H.-U., Maxfield, S.J., Meer, D., Mehta, A., Meier, K., Meyer, A.B., Meyer, H., Meyer, J., Mikocki, S., Milcewicz-Mika, I., Milstead, D., Mladenov, D., Mohamed, A., Moreau, F., Morozov, A., Morris, J.V., Mozer, M.U., Muller, K., Murin, P., Nankov, K., Naroska, B., Naumann, T., Newman, P.R., Niebuhr, C., Nikiforov, A., Nikitin, D., Nowak, G., Nozicka, M., Oganezov, R., Olivier, B., Olsson, J.E., Osman, S., Ozerov, D., Palichik, V., Panagoulias, I., Papadopoulou, T., Pascaud, C., Patel, G.D., Peez, M., Perez, Emile, Perez-Astudillo, D., Perieanu, A., Petrukhin, A., Pitzl, D., Placakyte, R., Portheault, B., Povh, B., Prideaux, P., Raicevic, N., Reimer, P., Rimmer, A., Risler, C., Rizvi, E., Robmann, P., Roland, B., Roosen, R., Rostovtsev, A., Rurikova, Z., Rusakov, S., Salvaire, F., Sankey, D.P.C., Sauvan, E., Schätzel, S., Schilling, F.-P., Schmidt, S., Schmitt, S., Schmitz, C., Schoeffel, L., Schoning, A., Schultz-Coulon, H.-C., Sedlak, K., Sefkow, F., Shaw-West, R.N., Sheviakov, I., Shtarkov, L.N., Sloan, T., Smirnov, P., Soloviev, Y., South, D., Spaskov, V., Specka, A., Stella, B., Stiewe, J., Strauch, I., Straumann, U., Tchoulakov, V., Thompson, G., Thompson, P.D., Tomasz, F., Traynor, D., Truol, P., Tsakov, I., Tsipolitis, G., Tsurin, I., Turnau, J., Tzamariudaki, E., Urban, Martin, Usik, A., Utkin, D., Valkar, S., Valkarova, A., Vallee, C., Van Mechelen, P., Vargas Trevino, A., Vazdik, Y., Veelken, C., Vest, A., Vinokurova, S., Volchinski, V., Vujicic, B., Wacker, K., Wagner, J., Weber, G., Weber, R., Wegener, D., Werner, C., Werner, N., Wessels, M., Wessling, B., Wigmore, C., Wissing, C., Wolf, R., Wunsch, E., Xella, S., Yan, W., Yeganov, V., Zacek, J., Zalesak, J., Zhang, Zhiqing, Zhelezov, A., Zhokin, A., Zhu, Y.C., Zimmermann, J., Zimmermann, T., Zohrabyan, H., Zomer, F., Sirois, Y., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Yukawa potential, FOS: Physical sciences, Charge (physics), HERA, Electron, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Higgs boson, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, High Energy Physics::Experiment, 010306 general physics, Boson, Lepton
Abstract

A search for the single production of doubly-charged Higgs bosons H ± ± in ep collisions is presented. The signal is searched for via the Higgs decays into a high mass pair of same charge leptons, one of them being an electron. The analysis uses up to 118 pb -1 of ep data collected by the H1 experiment at HERA. No evidence for doubly-charged Higgs production is observed and mass dependent upper limits are derived on the Yukawa couplings h e l of the Higgs boson to an electron-lepton pair. Assuming that the doubly-charged Higgs only decays into an electron and a muon via a coupling of electromagnetic strength h e μ = sqrt(4 π α em) ≃ 0.3, a lower limit of 141 GeV on the H ± ± mass is obtained at the 95% confidence level. For a doubly-charged Higgs decaying only into an electron and a tau and a coupling h e τ ≃ 0.3, masses below 112 GeV are ruled out. © 2006 Elsevier B.V. All rights reserved., 0, DESY-06-038 / hep-ex/0604027, H1 Collaboration., info:eu-repo/semantics/published

Published
2006
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190. COMPARISON OF DYNAMIC MASK- AND VECTOR-BASED CERAMIC STEREOLITHOGRAPHY.

Author

Baumgartner, S., Pfaffinger, M., Busetti, B., and Stampfl, J.

Subjects
CERAMIC material manufacturing, STEREOLITHOGRAPHY, THREE-dimensional printing, FILLER materials, POLYMERIZATION
Abstract

Additive manufacturing (AM) has developed into a promising technology allowing the parallel production of several complex parts with high resolution. Especially AM of ceramics shows great potential in the field of medical and dental applications where personalized aesthetic restorations are demanded. Accuracy is therefore a must to meet the high standards of those fields. At TU Wien we developed a special lithography based manufacturing technology where layer-by-layer a photosensitive slurry with ceramic or glass-ceramic filler is cured. To get dense ceramics the so called green body is then debinded and sintered. Two printing systems were evaluated: The first system uses a Digital Light Processing (DLP) approach, where a digital mirror device projects visible light (460 nm) and triggers polymerization. A second system is based on a diode-laser with 405 nm wavelength. In this case a galvanoscanner is used for structuring. The second system enables a feature resolution down to 20 m. The aim of this study is to compare both of this technologies for multiple ceramics such as zirconium oxide, tricalcium phosphate and composites. In order to get the best accuracy, printing parameters such as laser speed, hatching style, exposure time and intensity are varied. [ABSTRACT FROM AUTHOR]

Published
2017

191. Measurement of beauty production at HERA using events with muons and jets

Author

H1 Collaboration, Aktas, A., Baumgartner, S., Berger, N., Erdmann, Wolfram, Grab, Christoph, List, Benno, Mangano, Salvatore, Meer, David, Schöning, André, and Weber, R.

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

A measurement of the beauty production cross section in ep collisions at a centre-of-mass energy of 319 GeV is presented. The data were collected with the H1 detector at the HERA collider in the years 1999-2000. Events are selected by requiring the presence of jets and muons in the final state. Both the long lifetime and the large mass of b-flavoured hadrons are exploited to identify events containing beauty quarks. Differential cross sections are measured in photoproduction, with photon virtualities Q2 < 1 GeV2, and in deep inelastic scattering, where 2 < Q2 < 100 GeV2. The results are compared with perturbative QCD calculations to leading and next-to-leading order. The predictions are found to be somewhat lower than the data., The European Physical Journal C, 41 (4), ISSN:1434-6044, ISSN:1434-6052

Published
2005

192. Measurement of dijet cross sections in ep interactions with a leading neutron at HERA

Author

H1 Collaboration, Aktas, A., Baumgartner, S., Berger, N., Erdmann, Wolfram, Grab, Christoph, List, Benno, Mangano, Salvatore, Meer, David, Schöning, André, and Weber, R.

Subjects
Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Measurements are reported of the production of dijet events with a leading neutron in ep interactions at HERA. Differential cross sections for photoproduction and deep inelastic scattering are presented as a function of several kinematic variables. Leading order QCD simulation programs are compared with the measurements. Models in which the real or virtual photon interacts with a parton of an exchanged pion are able to describe the data. Next-to-leading order perturbative QCD calculations based on pion exchange are found to be in good agreement with the measured cross sections. The fraction of leading neutron dijet events with respect to all dijet events is also determined. The dijet events with a leading neutron have a lower fraction of resolved photon processes than do the inclusive dijet data., The European Physical Journal C, 41 (3), ISSN:1434-6044, ISSN:1434-6052

Published
2005

193. Measurement of prompt photon cross sections in photoproduction at HERA

Author

H1 Collaboration, Aktas, A., Baumgartner, S., Berger, N., Erdmann, Wolfram, Grab, Christoph, List, Benno, Mangano, Salvatore, Meer, David, Schöning, André, and Weber, R.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Results are presented on the photoproduction of isolated prompt photons, inclusively and associated with jets, in the γp center of mass energy range 142 < W < 266 GeV. The cross sections are measured for the transverse momentum range of the photons 5 4.5 GeV. They are measured differentially as a function of EγT,EjetT, the pseudorapidities ηγ and ηjet and estimators of the momentum fractions xγ and x p of the incident photon and proton carried by the constituents participating in the hard process. In order to further investigate the underlying dynamics, the angular correlation between the prompt photon and the jet in the transverse plane is studied. Predictions by perturbative QCD calculations in next to leading order are about 30% below the inclusive prompt photon data after corrections for hadronisation and multiple interactions, but are in reasonable agreement with the results for prompt photons associated with jets. Comparisons with the predictions of the event generators PYTHIA and HERWIG are also presented., The European Physical Journal C, 38 (4), ISSN:1434-6044, ISSN:1434-6052

Published
2005

195. Measurement of Prompt Photon Cross Sections in Photoproduction at HERA

Author

Aktas, A., Andreev, V., Anthonis, T., Asmone, A., Babaev, A., Backovic, S., Bahr, J., Baranov, P., Barrelet, E., Bartel, W., Baumgartner, S., Becker, J., Beckingham, M., Behnke, O., Behrendt, O., Belousov, A., Berger, Ch., Berger, N., Berndt, T., Bizot, J.C., Bohme, J., Boenig, M.-O., Boudry, V., Bracinik, J., Brisson, V., Broker, H.-B., Brown, D.P., Bruncko, D., Busser, F.W., Bunyatyan, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Caron, S., Cassol-Brunner, F., Cerny, K., Chekelian, V., Collard, C., Contreras, J.G., Coppens, Y.R., Coughlan, J.A., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., Delcourt, B., Demirchyan, R., Roeck, A. De, Desch, K., Wolf, E.A. De, Diaconu, C., Dingfelder, J., Dodonov, V., Dubak, A., Duprel, C., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Ellerbrock, M., Elsen, E., Erdmann, M., Erdmann, W., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Fleischer, M., Fleischmann, P., Fleming, Y.H., Flucke, G., Flugge, G., Fomenko, A., Foresti, I., Formanek, J., Franke, G., Frising, G., Gabathuler, E., Gabathuler, K., Garutti, E., Garvey, J., Gayler, J., Gerhards, R., Gerlich, C., Ghazaryan, S., Goerlich, L., Gogitidze, N., Gorbounov, S., Grab, C., Grassler, H., Greenshaw, T., Gregori, M., Grindhammer, G., Gwilliam, C., Haidt, D., Hajduk, L., Haller, J., Hansson, M., Heinzelmann, G., Henderson, R.C.W., Henschel, H., Henshaw, O., Heremans, R., Herrera, G., Herynek, I., Heuer, R.-D., Hildebrandt, M., Hiller, K.H., Hoting, P., Hoffmann, D., Horisberger, R., Hovhannisyan, A., Ibbotson, M., Ismail, M., Jacquet, M., Janauschek, L., Janssen, X., Jemanov, V., Jonsson, L., Johnson, D.P., Jung, H., Kant, D., Kapichine, M., Karlsson, M., Katzy, J., Keller, N., Kennedy, J., Kenyon, I.R., Kiesling, C., Klein, M., Kleinwort, C., Klimkovich, T., Kluge, T., Knies, G., Knutsson, A., Koblitz, B., Korbel, V., Kostka, P., Koutouev, R., Kropivnitskaya, A., Kroseberg, J., Kuckens, J., Kuhr, T., Landon, M.P.J., Lange, W., Lastovicka, T., Laycock, P., Lebedev, A., Leiner, B., Lemrani, R., Lendermann, V., Levonian, S., Lindfeld, L., Lipka, K., List, B., Lobodzinska, E., Loktionova, N., Lopez-Fernandez, R., Lubimov, V., Lueders, H., Luke, D., Lux, T., Lytkin, L., Makankine, A., Malden, N., Malinovski, E., Mangano, S., Marage, P., Marks, J., Marshall, R., Martisikova, M., Martyn, H.-U., Maxfield, S.J., Meer, D., Mehta, A., Meier, K., Meyer, A.B., Meyer, H., Meyer, J., Michine, S., Mikocki, S., Milcewicz-Mika, I., Milstead, D., Mohamed, A., Moreau, F., Morozov, A., Morozov, I., Morris, J.V., Mozer, M.U., Muller, K., Murn, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, Th., Newman, P.R., Niebuhr, C., Nikiforov, A., Nikitin, D., Nowak, G., Nozicka, M., Oganezov, R., Olivier, B., Olsson, J.E., Ossoskov, G., Ozerov, D., Pascaud, C., Patel, G.D., Peez, M., Perez, Emile, Perieanu, A., Petrukhin, A., Pitzl, D., Placakyte, R., Poschl, R., Portheault, B., Povh, B., Raicevic, N., Ratiani, Z., Reimer, P., Reisert, B., Rimmer, A., Risler, C., Rizvi, E., Robmann, P., Roland, B., Roosen, R., Rostovtsev, A., Rurikova, Z., Rusakov, S., Rybicki, K., Sankey, D.P.C., Sauvan, E., Schatzel, S., Scheins, J., Schilling, F.-P., Schleper, P., Schmidt, S., Schmitt, S., Schneider, M., Schoeffel, L., Schoning, A., Schroder, V., Schultz-Coulon, H.-C., Schwanenberger, C., Sedlak, K., Sefkow, F., Sheviakov, I., Shtarkov, L.N., Sirois, Y., Sloan, T., Smirnov, P., Soloviev, Y., South, D., Spaskov, V., Specka, A., Spitzer, H., Stamen, R., Stella, B., Stiewe, J., Strauch, I., Straumann, U., Tchoulakov, V., Thompson, G., Thompson, P.D., Tomasz, F., Traynor, D., Truol, P., Tsipolitis, G., Tsurin, I., Turnau, J., Tzamariudaki, E., Uraev, A., Urban, Martin, Usik, A., Utkin, D., Valkar, S., Valkarova, A., Vallee, C., Mechelen, P. Van, Remortel, N. Van, Trevino, A. Vargas, Vazdik, Y., Veelken, C., Vest, A., Vinokurova, S., Volchinski, V., Wacker, K., Wagner, J., Weber, G., Weber, R., Wegener, D., Werner, C., Werner, N., Wessels, M., Wessling, B., Winter, G.-G., Wissing, Ch., Woehrling, E.-E., Wolf, R., Wunsch, E., Xella, S., Yan, W., Yeganov, V., Zacek, J., Zalesak, J., Zhang, Zhiqing, Zhokin, A., Zohrabyan, H., Zomer, F., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and H1

Subjects
Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Perturbative QCD, HERA, Jet (particle physics), 01 natural sciences, High Energy Physics - Experiment, Momentum, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Center of mass, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Event (particle physics)
Abstract

Results are presented on the photoproduction of isolated prompt photons, inclusively and associated with jets, in the gamma p center of mass energy range 142 < W < 266 GeV. The cross sections are measured for the transverse momentum range of the photons 5 < E_T^gamma < 10 GeV and for associated jets with E_T^jet > 4.5 GeV. They are measured differentially as a function of E_T^gamma, E_T^jet, the pseudorapidities eta^gamma and eta^jet and estimators of the momentum fractions x_gamma and x_p of the incident photon and proton carried by the constituents participating in the hard process. In order to further investigate the underlying dynamics, the angular correlation between the prompt photon and the jet in the transverse plane is studied. Predictions by perturbative QCD calculations in next to leading order are about 30% below the inclusive prompt photon data after corrections for hadronisation and multiple interactions, but are in reasonable agreement with the results for prompt photons associated with jets. Comparisons with the predictions of the event generators PYTHIA and HERWIG are also presented., 21 pages, 6 figures, 3 tables

Published
2005
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196. Measurement of charm and beauty photoproduction at HERA using D*mu correlations

Author

H1 Collaboration, Aktas, A., Baumgartner, S., Berger, N., Erdmann, Wolfram, Grab, Christoph, List, Benno, Mangano, Salvatore, Meer, David, Schöning, André, and Weber, R.

Subjects
High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D*± meson and a muon. The correlation between the D* meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm cross section is in good agreement with QCD predictions including higher order effects while the beauty cross section is higher., Physics Letters B, 621 (1-2), ISSN:0370-2693, ISSN:0031-9163, ISSN:1873-2445, Physics letters. B

Published
2005
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197. Measurement of F-2(c(c)over-bar) and F-2(b(b)over-bar) at high Q(2) using the H1 vertex detector at HERA

Author

H1 Collaboration, Aktas, A., Baumgartner, S., Berger, N., Erdmann, Wolfram, Grab, Christoph, List, Benno, Mangano, Salvatore, Meer, David, Schöning, André, and Weber, R.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Measurements are presented of inclusive charm and beauty cross sections in e + p collisions at HERA for values of photon virtuality Q 2 > 150 GeV2 and of inelasticity 0.1 < y < 0.7. The charm and beauty fractions are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. The data are divided into four regions in Q 2 and Bjorken x, and values for the structure functions Fcc¯2 and Fbb¯2 are obtained. The results are found to be compatible with the predictions of perturbative quantum chromodynamics., The European Physical Journal C, 40 (3), ISSN:1434-6044, ISSN:1434-6052

Published
2005
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198. Search for squark production in R-parity violating supersymmetry at HERA

Author

H1 Collaboration, Aktas, A., Baumgartner, S., Berger, N., Erdmann, Wolfram, Grab, Christoph, List, Benno, Mangano, Salvatore, Meer, David, Schöning, A., and Weber, R.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

A search for squarks in R-parity violating supersymmetry is performed in e±p collisions at HERA using the H1 detector. The data were taken at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 64.3 pb-1 for e + p collisions and 13.5 pb-1 for e - p collisions. The resonant production of squarks via a Yukawa coupling λ′ is considered, taking into account direct and indirect R-parity violating decay modes. No evidence for squark production is found in the multi-lepton and multi-jet final state topologies investigated. Mass dependent limits on λ′ are obtained in the framework of the Minimal Supersymmetric Standard Model. In addition, the results are interpreted in terms of constraints on the parameters of the minimal Supergravity model. At the 95% confidence level squarks of all flavours with masses up to 275 GeV are excluded in a large part of the parameter space for a Yukawa coupling of electromagnetic strength. For a coupling strength 100 times smaller, masses up to 220 GeV can be ruled out., The European Physical Journal C, 36 (4), ISSN:1434-6044, ISSN:1434-6052

Published
2004
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199. Search for bosonic stop decays in R-parity violating supersymmetry in $e^+p$ collisions at HERA

Author

Aktas, A., Andreev, V., Anthonis, T., Asmone, A., Babaev, A., Backovic, S., Bahr, J., Baranov, P., Barrelet, E., Bartel, W., Baumgartner, S., Becker, J., Beckingham, M., Behnke, O., Behrendt, O., Belousov, A., Berger, Ch., Berger, N., Berndt, T., Bizot, J.C., Bohme, J., Boenig, M.-O., Boudry, V., Bracinik, J., Brisson, V., Broker, H.-B., Brown, D.P., Bruncko, D., Busser, F.W., Bunyatyan, A., Buschhorn, G., Bystritskaya, L., Campbell, A.J., Caron, S., Cassol-Brunner, F., Cerny, K., Chekelian, V., Contreras, J.G., Coppens, Y.R., Coughlan, J.A., Cox, B.E., Cozzika, G., Cvach, J., Dainton, J.B., Dau, W.D., Daum, K., Delcourt, B., Demirchyan, R., de Roeck, A., Desch, K., de Wolf, E.A., Diaconu, C., Dingfelder, J., Dodonov, V., Dubak, A., Duprel, C., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Ellerbrock, M., Elsen, E., Erdmann, M., Erdmann, W., Faulkner, P.J.W., Favart, L., Fedotov, A., Felst, R., Ferencei, J., Fleischer, M., Fleischmann, P., Fleming, Y.H., Flucke, G., Flugge, G., Fomenko, A., Foresti, I., Formanek, J., Franke, G., Frising, G., Gabathuler, E., Gabathuler, K., Garutti, E., Garvey, J., Gayler, J., Gerhards, R., Gerlich, C., Ghazaryan, S., Ginzburgskaya, S., Goerlich, L., Gogitidze, N., Gorbounov, S., Grab, C., Grassler, H., Greenshaw, T., Gregori, M., Grindhammer, G., Gwilliam, C., Haidt, D., Hajduk, L., Haller, J., Hansson, M., Heinzelmann, G., Henderson, R.C.W., Henschel, H., Henshaw, O., Herrera, G., Herynek, I., Heuer, R.-D., Hildebrandt, M., Hiller, K.H., Hoting, P., Hoffmann, D., Horisberger, R., Hovhannisyan, A., Ibbotson, M., Ismail, M., Jacquet, M., Janauschek, L., Janssen, X., Jemanov, V., Jonsson, L., Johnson, D.P., Jung, H., Kant, D., Kapichine, M., Karlsson, M., Katzy, J., Keller, N., Kennedy, J., Kenyon, I.R., Kiesling, C., Klein, M., Kleinwort, C., Klimkovich, T., Kluge, T., Knies, G., Knutsson, A., Koblitz, B., Korbel, V., Kostka, P., Koutouev, R., Kropivnitskaya, A., Kroseberg, J., Kruger, K., Kuckens, J., Kuhr, T., Landon, M.P.J., Lange, W., Lastovicka, T., Laycock, P., Lebedev, A., Leiner, B., Lemrani, R., Lendermann, V., Levonian, S., Lindfeld, L., Lipka, K., List, B., Lobodzinska, E., Loktionova, N., Lopez-Fernandez, R., Lubimov, V., Lueders, H., Luke, D., Lux, T., Lytkin, L., Makankine, A., Malden, N., Malinovski, E., Mangano, S., Marage, P., Marks, J., Marshall, R., Martisikova, M., Martyn, H.-U., Maxfield, S.J., Meer, D., Mehta, A., Meier, K., Meyer, A.B., Meyer, H., Meyer, J., Mikocki, S., Milcewicz-Mika, I., Milstead, D., Mohamed, A., Moreau, F., Morozov, A., Morozov, I., Morris, J.V., Mozer, M.U., Muller, K., Murn, P., Nagovizin, V., Nankov, K., Naroska, B., Naumann, J., Naumann, Th., Newman, P.R., Niebuhr, C., Nikiforov, A., Nikitin, D., Nowak, G., Nozicka, M., Oganezov, R., Olivier, B., Olsson, J.E., Ossoskov, G., Ozerov, D., Paramonov, A., Pascaud, C., Patel, G.D., Peez, M., Perez, Emile, Perieanu, A., Petrukhin, A., Pitzl, D., Placakyte, R., Poschl, R., Portheault, B., Povh, B., Raicevic, N., Reimer, P., Reisert, B., Rimmer, A., Risler, C., Rizvi, E., Robmann, P., Roland, B., Roosen, R., Rostovtsev, A., Rurikova, Z., Rusakov, S., Rybicki, K., Sankey, D.P.C., Sauvan, E., Schatzel, S., Scheins, J., Schilling, F.-P., Schleper, P., Schmidt, S., Schmitt, S., Schneider, M., Schoeffel, L., Schoning, A., Schroder, V., Schultz-Coulon, H.-C., Schwanenberger, C., Sedlak, K., Sefkow, F., Sheviakov, I., Shtarkov, L.N., Sirois, Y., Sloan, T., Smirnov, P., Soloviev, Y., South, D., Spaskov, V., Specka, A., Spitzer, H., Stamen, R., Stella, B., Stiewe, J., Strauch, I., Straumann, U., Tchoulakov, V., Thompson, G., Thompson, P.D., Tomasz, F., Traynor, D., Truol, P., Tsipolitis, G., Tsurin, I., Turnau, J., Tzamariudaki, E., Uraev, A., Urban, Martin, Usik, A., Utkin, D., Valkar, S., Valkarova, A., Vallee, C., van Mechelen, P., van Remortel, N., Vargas Trevino, A., Vazdik, Y., Veelken, C., Vest, A., Vinokurova, S., Volchinski, V., Wacker, K., Wagner, J., Weber, G., Weber, R., Wegener, D., Werner, C., Werner, N., Wessels, M., Wessling, B., Winter, G.-G., Wissing, Ch., Woehrling, E.-E., Wolf, R., Wunsch, E., Xella, S., Yan, W., Yeganov, V., Zacek, J., Zalesak, J., Zhang, Zhiqing, Zhelezov, A., Zhokin, A., Zohrabyan, H., Zomer, F., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics - Experiment (hep-ex), High Energy Physics::Phenomenology, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, High Energy Physics::Experiment, High Energy Physics - Experiment
Abstract

A search for scalar top quarks in R-parity violating supersymmetry is performed in e^+ p collisions at HERA using the H1 detector. The data, taken at sqrt{s}=319 GeV and 301 GeV, correspond to an integrated luminosity of 106 pb^-1. The resonant production of scalar top quarks \tilde{t} in positron quark fusion via an R-parity violating Yukawa coupling lambda' is considered with the subsequent bosonic stop decay \tilde{t} -> \tilde{b} W. The R-parity violating decay of the sbottom quark tilde{b} -> d \bar{nu_e} and leptonic and hadronic W decays are considered. No evidence for stop production is found in the search for bosonic stop decays nor in a search for the direct R-parity violating decay \tilde{t} -> eq. Mass dependent limits on lambda' are obtained in the framework of the Minimal Supersymmetric Standard Model. Stop quarks with masses up to 275 GeV can be excluded at the 95% confidence level for a Yukawa coupling of electromagnetic strength., 20 pages, 5 figures and 2 tables

Published
2004

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