{"id":{"repo_id":"heid-diss","oai_identifier":"oai:archiv.ub.uni-heidelberg.de:2292"},"canonical_url":"https://search.dev.ndltd.org/etd/heid-diss/oai:archiv.ub.uni-heidelberg.de:2292","repository":{"repo_id":"heid-diss","name":"Universität Heidelberg","base_url":"http://archiv.ub.uni-heidelberg.de/volltextserver/cgi/oai2"},"display":{"title":"Measurement of inclusive Lambda / Antilambda hyperon polarisation in proton nucleus collisions at 920 GeV proton beam energy","abstract":"A minimum bias dataset was analysed for transverse hyperon polarisation in p + A -> Lambda / Antilambda + X events. The data were taken in the commissioning phase of the HERA-B detector at HERA, DESY, using the proton beam of 920 GeV energy to collide with fixed target wires of different materials. A sample of approximately 2900 Lambdas was obtained in a kinematical region of transverse momentum p_t in [0.2,2.2] GeV/c and Feynman variable x_F in [-0.19,0.03] and roughly 1350 Antilambdas were found in the range of p_t in [0.12,1.64] GeV/c and x_F in [-0.13,0.01]. These samples were analysed for transverse polarisation using extensive Monte Carlo studies for acceptance determination, yielding: Pol(Lambda) : 0.073 +/- 0.073 (stat) +/- 0.0095 (syst) Pol(Antilambda): 0.006 +/- 0.129 (stat) +/- 0.0381 (syst). The found result is compatible with the only other inclusive measurement that is available at x_F < 0. Concluding, the possible significant contribution to the field of hyperon polarisation physics of the HERA-B spectrometer due to its unique kinematical range and possibility to study A dependencies is pointed out.","abstract_html":"A minimum bias dataset was analysed for transverse hyperon polarisation in p + A -&gt; Lambda / Antilambda + X events. The data were taken in the commissioning phase of the HERA-B detector at HERA, DESY, using the proton beam of 920 GeV energy to collide with fixed target wires of different materials. A sample of approximately 2900 Lambdas was obtained in a kinematical region of transverse momentum p_t in [0.2,2.2] GeV/c and Feynman variable x_F in [-0.19,0.03] and roughly 1350 Antilambdas were found in the range of p_t in [0.12,1.64] GeV/c and x_F in [-0.13,0.01]. These samples were analysed for transverse polarisation using extensive Monte Carlo studies for acceptance determination, yielding: Pol(Lambda) : 0.073 +/- 0.073 (stat) +/- 0.0095 (syst) Pol(Antilambda): 0.006 +/- 0.129 (stat) +/- 0.0381 (syst). The found result is compatible with the only other inclusive measurement that is available at x_F &lt; 0. Concluding, the possible significant contribution to the field of hyperon polarisation physics of the HERA-B spectrometer due to its unique kinematical range and possibility to study A dependencies is pointed out.","abstract_has_math":false,"creators":["Pleier, Marc-André"],"institution":"Universität Heidelberg","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Knöpfle, Karl-Tasso"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002-07-03","date_published":"2002-07-03","updated_at":"2026-07-24T02:29:18Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://www.ub.uni-heidelberg.de/archiv/2292","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Knöpfle, Karl-Tasso"]},{"key":"dc:creator","label":"Author","values":["Pleier, Marc-André"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universitätsbibliothek Heidelberg"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Heidelberg"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A minimum bias dataset was analysed for transverse hyperon polarisation in p + A -> Lambda / Antilambda + X events. The data were taken in the commissioning phase of the HERA-B detector at HERA, DESY, using the proton beam of 920 GeV energy to collide with fixed target wires of different materials. A sample of approximately 2900 Lambdas was obtained in a kinematical region of transverse momentum p_t in [0.2,2.2] GeV/c and Feynman variable x_F in [-0.19,0.03] and roughly 1350 Antilambdas were found in the range of p_t in [0.12,1.64] GeV/c and x_F in [-0.13,0.01]. These samples were analysed for transverse polarisation using extensive Monte Carlo studies for acceptance determination, yielding: Pol(Lambda) : 0.073 +/- 0.073 (stat) +/- 0.0095 (syst) Pol(Antilambda): 0.006 +/- 0.129 (stat) +/- 0.0381 (syst). The found result is compatible with the only other inclusive measurement that is available at x_F < 0. Concluding, the possible significant contribution to the field of hyperon polarisation physics of the HERA-B spectrometer due to its unique kinematical range and possibility to study A dependencies is pointed out.","Im Rahmen dieser Arbeit wurde ein 'Minimum Bias' Datensatz im Hinblick auf transversale Hyperon-Polarisation in p + A -> Lambda / Antilambda + X Ereignissen analysiert. Die Datennahme erfolgte während der Inbetriebnahme des HERA-B Detektors am HERA Speicherring des DESY unter Verwendung des Protonenstrahls einer Energie von 920 GeV in Wechselwirkung mit Draht-Targets unterschiedlicher Materialien. Im kinematischen Bereich von Transversalimpuls p_t in [0.2,2.2] GeV/c und Feynman Variable x_F in [-0.19,0.03] wurden hierbei ca. 2900 Lambdas rekonstruiert; weiterhin wurden ca. 1350 Antilambdas im Bereich von p_t in [0.12,1.64] GeV/c und x_F in [-0.13,0.01] gefunden. Die Polarisationsanalyse dieser Hyperonen ergab unter Verwendung von detaillierten Monte Carlo Studien zur Akzeptanzbestimmung folgendes Ergebnis: Pol(Lambda) : 0.073 +/- 0.073 (stat) +/- 0.0095 (syst) Pol(Antilambda): 0.006 +/- 0.129 (stat) +/- 0.0381 (syst). Dieses Resultat ist mit der einzigen im Bereich x_F < 0 verfügbaren inklusiven Messung verträglich. Abschließend wird ausgeführt, daß das HERA-B Spektrometer aufgrund seines kinematischen Bereiches und der Möglichkeit, unterschiedliche Targetmaterialien einzusetzen, einen wesentlichen Beitrag zum Gebiet der Hyperon-Polarisation leisten könnte."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Measurement of inclusive Lambda / Antilambda hyperon polarisation in proton nucleus collisions at 920 GeV proton beam energy","Messung inklusiver Lambda / Antilambda Hyperon Polarisation in Proton-Kern Kollisionen bei 920 GeV Proton Strahl-Energie"]}]}],"canonical_facts":{"dc:contributor":["Knöpfle, Karl-Tasso"],"dc:creator":["Pleier, Marc-André"],"dc:description.abstract":["A minimum bias dataset was analysed for transverse hyperon polarisation in p + A -> Lambda / Antilambda + X events. The data were taken in the commissioning phase of the HERA-B detector at HERA, DESY, using the proton beam of 920 GeV energy to collide with fixed target wires of different materials. A sample of approximately 2900 Lambdas was obtained in a kinematical region of transverse momentum p_t in [0.2,2.2] GeV/c and Feynman variable x_F in [-0.19,0.03] and roughly 1350 Antilambdas were found in the range of p_t in [0.12,1.64] GeV/c and x_F in [-0.13,0.01]. These samples were analysed for transverse polarisation using extensive Monte Carlo studies for acceptance determination, yielding: Pol(Lambda) : 0.073 +/- 0.073 (stat) +/- 0.0095 (syst) Pol(Antilambda): 0.006 +/- 0.129 (stat) +/- 0.0381 (syst). The found result is compatible with the only other inclusive measurement that is available at x_F < 0. Concluding, the possible significant contribution to the field of hyperon polarisation physics of the HERA-B spectrometer due to its unique kinematical range and possibility to study A dependencies is pointed out.","Im Rahmen dieser Arbeit wurde ein 'Minimum Bias' Datensatz im Hinblick auf transversale Hyperon-Polarisation in p + A -> Lambda / Antilambda + X Ereignissen analysiert. Die Datennahme erfolgte während der Inbetriebnahme des HERA-B Detektors am HERA Speicherring des DESY unter Verwendung des Protonenstrahls einer Energie von 920 GeV in Wechselwirkung mit Draht-Targets unterschiedlicher Materialien. Im kinematischen Bereich von Transversalimpuls p_t in [0.2,2.2] GeV/c und Feynman Variable x_F in [-0.19,0.03] wurden hierbei ca. 2900 Lambdas rekonstruiert; weiterhin wurden ca. 1350 Antilambdas im Bereich von p_t in [0.12,1.64] GeV/c und x_F in [-0.13,0.01] gefunden. Die Polarisationsanalyse dieser Hyperonen ergab unter Verwendung von detaillierten Monte Carlo Studien zur Akzeptanzbestimmung folgendes Ergebnis: Pol(Lambda) : 0.073 +/- 0.073 (stat) +/- 0.0095 (syst) Pol(Antilambda): 0.006 +/- 0.129 (stat) +/- 0.0381 (syst). Dieses Resultat ist mit der einzigen im Bereich x_F < 0 verfügbaren inklusiven Messung verträglich. Abschließend wird ausgeführt, daß das HERA-B Spektrometer aufgrund seines kinematischen Bereiches und der Möglichkeit, unterschiedliche Targetmaterialien einzusetzen, einen wesentlichen Beitrag zum Gebiet der Hyperon-Polarisation leisten könnte."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universitätsbibliothek Heidelberg"],"dc:title":["Measurement of inclusive Lambda / Antilambda hyperon polarisation in proton nucleus collisions at 920 GeV proton beam energy","Messung inklusiver Lambda / Antilambda Hyperon Polarisation in Proton-Kern Kollisionen bei 920 GeV Proton Strahl-Energie"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Heidelberg"]},"updated_at":"2026-07-24T02:29:18Z"}